Merging upstream version 6.9.7.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

18 files changed, 474 insertions, 459 deletions

diff --git a/drivers/tty/serial/8250/8250_aspeed_vuart.c b/drivers/tty/serial/8250/8250_aspeed_vuart.c
index 8c2aaf7af7..53d8eee9b1 100644
--- a/drivers/tty/serial/8250/8250_aspeed_vuart.c
+++ b/drivers/tty/serial/8250/8250_aspeed_vuart.c
@@ -419,8 +419,8 @@ static int aspeed_vuart_probe(struct platform_device *pdev)
 	struct aspeed_vuart *vuart;
 	struct device_node *np;
 	struct resource *res;
-	u32 clk, prop, sirq[2];
 	int rc, sirq_polarity;
+	u32 prop, sirq[2];
 	struct clk *vclk;
 
 	np = pdev->dev.of_node;
@@ -447,53 +447,35 @@ static int aspeed_vuart_probe(struct platform_device *pdev)
 	port.port.status = UPSTAT_SYNC_FIFO;
 	port.port.dev = &pdev->dev;
 	port.port.has_sysrq = IS_ENABLED(CONFIG_SERIAL_8250_CONSOLE);
+	port.port.flags = UPF_BOOT_AUTOCONF | UPF_IOREMAP | UPF_FIXED_PORT | UPF_FIXED_TYPE |
+			  UPF_NO_THRE_TEST;
 	port.bugs |= UART_BUG_TXRACE;
 
 	rc = sysfs_create_group(&vuart->dev->kobj, &aspeed_vuart_attr_group);
 	if (rc < 0)
 		return rc;
 
-	if (of_property_read_u32(np, "clock-frequency", &clk)) {
+	rc = uart_read_port_properties(&port.port);
+	if (rc)
+		goto err_sysfs_remove;
+
+	/* Get clk rate through clk driver if present */
+	if (!port.port.uartclk) {
 		vclk = devm_clk_get_enabled(dev, NULL);
 		if (IS_ERR(vclk)) {
 			rc = dev_err_probe(dev, PTR_ERR(vclk), "clk or clock-frequency not defined\n");
 			goto err_sysfs_remove;
 		}
 
-		clk = clk_get_rate(vclk);
+		port.port.uartclk = clk_get_rate(vclk);
 	}
 
 	/* If current-speed was set, then try not to change it. */
 	if (of_property_read_u32(np, "current-speed", &prop) == 0)
-		port.port.custom_divisor = clk / (16 * prop);
-
-	/* Check for shifted address mapping */
-	if (of_property_read_u32(np, "reg-offset", &prop) == 0)
-		port.port.mapbase += prop;
-
-	/* Check for registers offset within the devices address range */
-	if (of_property_read_u32(np, "reg-shift", &prop) == 0)
-		port.port.regshift = prop;
+		port.port.custom_divisor = port.port.uartclk / (16 * prop);
 
-	/* Check for fifo size */
-	if (of_property_read_u32(np, "fifo-size", &prop) == 0)
-		port.port.fifosize = prop;
-
-	/* Check for a fixed line number */
-	rc = of_alias_get_id(np, "serial");
-	if (rc >= 0)
-		port.port.line = rc;
-
-	port.port.irq = irq_of_parse_and_map(np, 0);
 	port.port.handle_irq = aspeed_vuart_handle_irq;
-	port.port.iotype = UPIO_MEM;
 	port.port.type = PORT_ASPEED_VUART;
-	port.port.uartclk = clk;
-	port.port.flags = UPF_SHARE_IRQ | UPF_BOOT_AUTOCONF | UPF_IOREMAP
-		| UPF_FIXED_PORT | UPF_FIXED_TYPE | UPF_NO_THRE_TEST;
-
-	if (of_property_read_bool(np, "no-loopback-test"))
-		port.port.flags |= UPF_SKIP_TEST;
 
 	if (port.port.fifosize)
 		port.capabilities = UART_CAP_FIFO;
@@ -503,7 +485,7 @@ static int aspeed_vuart_probe(struct platform_device *pdev)
 
 	rc = serial8250_register_8250_port(&port);
 	if (rc < 0)
-		goto err_clk_disable;
+		goto err_sysfs_remove;
 
 	vuart->line = rc;
 	vuart->port = serial8250_get_port(vuart->line);
@@ -529,7 +511,7 @@ static int aspeed_vuart_probe(struct platform_device *pdev)
 	rc = aspeed_vuart_set_lpc_address(vuart, prop);
 	if (rc < 0) {
 		dev_err_probe(dev, rc, "invalid value in aspeed,lpc-io-reg property\n");
-		goto err_clk_disable;
+		goto err_sysfs_remove;
 	}
 
 	rc = of_property_read_u32_array(np, "aspeed,lpc-interrupts", sirq, 2);
@@ -541,14 +523,14 @@ static int aspeed_vuart_probe(struct platform_device *pdev)
 	rc = aspeed_vuart_set_sirq(vuart, sirq[0]);
 	if (rc < 0) {
 		dev_err_probe(dev, rc, "invalid sirq number in aspeed,lpc-interrupts property\n");
-		goto err_clk_disable;
+		goto err_sysfs_remove;
 	}
 
 	sirq_polarity = aspeed_vuart_map_irq_polarity(sirq[1]);
 	if (sirq_polarity < 0) {
 		rc = dev_err_probe(dev, sirq_polarity,
 				   "invalid sirq polarity in aspeed,lpc-interrupts property\n");
-		goto err_clk_disable;
+		goto err_sysfs_remove;
 	}
 
 	aspeed_vuart_set_sirq_polarity(vuart, sirq_polarity);
@@ -559,8 +541,6 @@ static int aspeed_vuart_probe(struct platform_device *pdev)
 
 	return 0;
 
-err_clk_disable:
-	irq_dispose_mapping(port.port.irq);
 err_sysfs_remove:
 	sysfs_remove_group(&vuart->dev->kobj, &aspeed_vuart_attr_group);
 	return rc;
diff --git a/drivers/tty/serial/8250/8250_bcm2835aux.c b/drivers/tty/serial/8250/8250_bcm2835aux.c
index beac6b340a..121a5ce860 100644
--- a/drivers/tty/serial/8250/8250_bcm2835aux.c
+++ b/drivers/tty/serial/8250/8250_bcm2835aux.c
@@ -45,10 +45,6 @@ struct bcm2835aux_data {
 	u32 cntl;
 };
 
-struct bcm2835_aux_serial_driver_data {
-	resource_size_t offset;
-};
-
 static void bcm2835aux_rs485_start_tx(struct uart_8250_port *up)
 {
 	if (!(up->port.rs485.flags & SER_RS485_RX_DURING_TX)) {
@@ -85,10 +81,9 @@ static void bcm2835aux_rs485_stop_tx(struct uart_8250_port *up)
 
 static int bcm2835aux_serial_probe(struct platform_device *pdev)
 {
-	const struct bcm2835_aux_serial_driver_data *bcm_data;
+	const struct software_node *bcm2835_swnode;
 	struct uart_8250_port up = { };
 	struct bcm2835aux_data *data;
-	resource_size_t offset = 0;
 	struct resource *res;
 	unsigned int uartclk;
 	int ret;
@@ -101,12 +96,8 @@ static int bcm2835aux_serial_probe(struct platform_device *pdev)
 	/* initialize data */
 	up.capabilities = UART_CAP_FIFO | UART_CAP_MINI;
 	up.port.dev = &pdev->dev;
-	up.port.regshift = 2;
 	up.port.type = PORT_16550;
-	up.port.iotype = UPIO_MEM;
-	up.port.fifosize = 8;
-	up.port.flags = UPF_SHARE_IRQ | UPF_FIXED_PORT | UPF_FIXED_TYPE |
-			UPF_SKIP_TEST | UPF_IOREMAP;
+	up.port.flags = UPF_FIXED_PORT | UPF_FIXED_TYPE | UPF_SKIP_TEST | UPF_IOREMAP;
 	up.port.rs485_config = serial8250_em485_config;
 	up.port.rs485_supported = serial8250_em485_supported;
 	up.rs485_start_tx = bcm2835aux_rs485_start_tx;
@@ -122,12 +113,6 @@ static int bcm2835aux_serial_probe(struct platform_device *pdev)
 	if (IS_ERR(data->clk))
 		return dev_err_probe(&pdev->dev, PTR_ERR(data->clk), "could not get clk\n");
 
-	/* get the interrupt */
-	ret = platform_get_irq(pdev, 0);
-	if (ret < 0)
-		return ret;
-	up.port.irq = ret;
-
 	/* map the main registers */
 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	if (!res) {
@@ -135,52 +120,40 @@ static int bcm2835aux_serial_probe(struct platform_device *pdev)
 		return -EINVAL;
 	}
 
-	bcm_data = device_get_match_data(&pdev->dev);
-
-	/* Some UEFI implementations (e.g. tianocore/edk2 for the Raspberry Pi)
-	 * describe the miniuart with a base address that encompasses the auxiliary
-	 * registers shared between the miniuart and spi.
-	 *
-	 * This is due to historical reasons, see discussion here :
-	 * https://edk2.groups.io/g/devel/topic/87501357#84349
-	 *
-	 * We need to add the offset between the miniuart and auxiliary
-	 * registers to get the real miniuart base address.
-	 */
-	if (bcm_data)
-		offset = bcm_data->offset;
+	up.port.mapbase = res->start;
+	up.port.mapsize = resource_size(res);
+
+	bcm2835_swnode = device_get_match_data(&pdev->dev);
+	if (bcm2835_swnode) {
+		ret = device_add_software_node(&pdev->dev, bcm2835_swnode);
+		if (ret)
+			return ret;
+	}
 
-	up.port.mapbase = res->start + offset;
-	up.port.mapsize = resource_size(res) - offset;
+	ret = uart_read_port_properties(&up.port);
+	if (ret)
+		goto rm_swnode;
 
-	/* Check for a fixed line number */
-	ret = of_alias_get_id(pdev->dev.of_node, "serial");
-	if (ret >= 0)
-		up.port.line = ret;
+	up.port.regshift = 2;
+	up.port.fifosize = 8;
 
 	/* enable the clock as a last step */
 	ret = clk_prepare_enable(data->clk);
 	if (ret) {
-		dev_err(&pdev->dev, "unable to enable uart clock - %d\n",
-			ret);
-		return ret;
+		dev_err_probe(&pdev->dev, ret, "unable to enable uart clock\n");
+		goto rm_swnode;
 	}
 
 	uartclk = clk_get_rate(data->clk);
-	if (!uartclk) {
-		ret = device_property_read_u32(&pdev->dev, "clock-frequency", &uartclk);
-		if (ret) {
-			dev_err_probe(&pdev->dev, ret, "could not get clk rate\n");
-			goto dis_clk;
-		}
-	}
+	if (uartclk)
+		up.port.uartclk = uartclk;
 
 	/* the HW-clock divider for bcm2835aux is 8,
 	 * but 8250 expects a divider of 16,
 	 * so we have to multiply the actual clock by 2
 	 * to get identical baudrates.
 	 */
-	up.port.uartclk = uartclk * 2;
+	up.port.uartclk *= 2;
 
 	/* register the port */
 	ret = serial8250_register_8250_port(&up);
@@ -194,6 +167,8 @@ static int bcm2835aux_serial_probe(struct platform_device *pdev)
 
 dis_clk:
 	clk_disable_unprepare(data->clk);
+rm_swnode:
+	device_remove_software_node(&pdev->dev);
 	return ret;
 }
 
@@ -203,10 +178,27 @@ static void bcm2835aux_serial_remove(struct platform_device *pdev)
 
 	serial8250_unregister_port(data->line);
 	clk_disable_unprepare(data->clk);
+	device_remove_software_node(&pdev->dev);
 }
 
-static const struct bcm2835_aux_serial_driver_data bcm2835_acpi_data = {
-	.offset = 0x40,
+/*
+ * Some UEFI implementations (e.g. tianocore/edk2 for the Raspberry Pi)
+ * describe the miniuart with a base address that encompasses the auxiliary
+ * registers shared between the miniuart and spi.
+ *
+ * This is due to historical reasons, see discussion here:
+ * https://edk2.groups.io/g/devel/topic/87501357#84349
+ *
+ * We need to add the offset between the miniuart and auxiliary registers
+ * to get the real miniuart base address.
+ */
+static const struct property_entry bcm2835_acpi_properties[] = {
+	PROPERTY_ENTRY_U32("reg-offset", 0x40),
+	{ }
+};
+
+static const struct software_node bcm2835_acpi_node = {
+	.properties = bcm2835_acpi_properties,
 };
 
 static const struct of_device_id bcm2835aux_serial_match[] = {
@@ -216,7 +208,7 @@ static const struct of_device_id bcm2835aux_serial_match[] = {
 MODULE_DEVICE_TABLE(of, bcm2835aux_serial_match);
 
 static const struct acpi_device_id bcm2835aux_serial_acpi_match[] = {
-	{ "BCM2836", (kernel_ulong_t)&bcm2835_acpi_data },
+	{ "BCM2836", (kernel_ulong_t)&bcm2835_acpi_node },
 	{ }
 };
 MODULE_DEVICE_TABLE(acpi, bcm2835aux_serial_acpi_match);
diff --git a/drivers/tty/serial/8250/8250_bcm7271.c b/drivers/tty/serial/8250/8250_bcm7271.c
index 4f8b70f8ce..61d81b11f6 100644
--- a/drivers/tty/serial/8250/8250_bcm7271.c
+++ b/drivers/tty/serial/8250/8250_bcm7271.c
@@ -22,6 +22,7 @@
 #include <linux/delay.h>
 #include <linux/clk.h>
 #include <linux/debugfs.h>
+#include <linux/units.h>
 
 #include "8250.h"
 
@@ -187,21 +188,19 @@
 #define TX_BUF_SIZE 4096
 #define RX_BUF_SIZE 4096
 #define RX_BUFS_COUNT 2
-#define KHZ    1000
-#define MHZ(x) ((x) * KHZ * KHZ)
 
 static const u32 brcmstb_rate_table[] = {
-	MHZ(81),
-	MHZ(108),
-	MHZ(64),		/* Actually 64285715 for some chips */
-	MHZ(48),
+	81 * HZ_PER_MHZ,
+	108 * HZ_PER_MHZ,
+	64 * HZ_PER_MHZ,		/* Actually 64285715 for some chips */
+	48 * HZ_PER_MHZ,
 };
 
 static const u32 brcmstb_rate_table_7278[] = {
-	MHZ(81),
-	MHZ(108),
+	81 * HZ_PER_MHZ,
+	108 * HZ_PER_MHZ,
 	0,
-	MHZ(48),
+	48 * HZ_PER_MHZ,
 };
 
 struct brcmuart_priv {
@@ -955,17 +954,14 @@ static void brcmuart_init_debugfs(struct brcmuart_priv *priv,
 static int brcmuart_probe(struct platform_device *pdev)
 {
 	struct resource *regs;
-	struct device_node *np = pdev->dev.of_node;
 	const struct of_device_id *of_id = NULL;
 	struct uart_8250_port *new_port;
 	struct device *dev = &pdev->dev;
 	struct brcmuart_priv *priv;
 	struct clk *baud_mux_clk;
 	struct uart_8250_port up;
-	int irq;
 	void __iomem *membase = NULL;
 	resource_size_t mapbase = 0;
-	u32 clk_rate = 0;
 	int ret;
 	int x;
 	int dma_irq;
@@ -973,15 +969,12 @@ static int brcmuart_probe(struct platform_device *pdev)
 		"uart", "dma_rx", "dma_tx", "dma_intr2", "dma_arb"
 	};
 
-	irq = platform_get_irq(pdev, 0);
-	if (irq < 0)
-		return irq;
 	priv = devm_kzalloc(dev, sizeof(struct brcmuart_priv),
 			GFP_KERNEL);
 	if (!priv)
 		return -ENOMEM;
 
-	of_id = of_match_node(brcmuart_dt_ids, np);
+	of_id = of_match_node(brcmuart_dt_ids, dev->of_node);
 	if (!of_id || !of_id->data)
 		priv->rate_table = brcmstb_rate_table;
 	else
@@ -1031,7 +1024,23 @@ static int brcmuart_probe(struct platform_device *pdev)
 		}
 	}
 
-	of_property_read_u32(np, "clock-frequency", &clk_rate);
+	dev_dbg(dev, "DMA is %senabled\n", priv->dma_enabled ? "" : "not ");
+
+	memset(&up, 0, sizeof(up));
+	up.port.type = PORT_BCM7271;
+	up.port.dev = dev;
+	up.port.mapbase = mapbase;
+	up.port.membase = membase;
+	up.port.handle_irq = brcmuart_handle_irq;
+	up.port.flags = UPF_BOOT_AUTOCONF | UPF_FIXED_PORT | UPF_FIXED_TYPE;
+	up.port.private_data = priv;
+
+	ret = uart_read_port_properties(&up.port);
+	if (ret)
+		goto release_dma;
+
+	up.port.regshift = 2;
+	up.port.iotype = device_is_big_endian(dev) ? UPIO_MEM32BE : UPIO_MEM32;
 
 	/* See if a Baud clock has been specified */
 	baud_mux_clk = devm_clk_get_optional_enabled(dev, "sw_baud");
@@ -1043,39 +1052,11 @@ static int brcmuart_probe(struct platform_device *pdev)
 
 		priv->baud_mux_clk = baud_mux_clk;
 		init_real_clk_rates(dev, priv);
-		clk_rate = priv->default_mux_rate;
+		up.port.uartclk = priv->default_mux_rate;
 	} else {
 		dev_dbg(dev, "BAUD MUX clock not specified\n");
 	}
 
-	if (clk_rate == 0) {
-		ret = dev_err_probe(dev, -EINVAL, "clock-frequency or clk not defined\n");
-		goto release_dma;
-	}
-
-	dev_dbg(dev, "DMA is %senabled\n", priv->dma_enabled ? "" : "not ");
-
-	memset(&up, 0, sizeof(up));
-	up.port.type = PORT_BCM7271;
-	up.port.uartclk = clk_rate;
-	up.port.dev = dev;
-	up.port.mapbase = mapbase;
-	up.port.membase = membase;
-	up.port.irq = irq;
-	up.port.handle_irq = brcmuart_handle_irq;
-	up.port.regshift = 2;
-	up.port.iotype = of_device_is_big_endian(np) ?
-		UPIO_MEM32BE : UPIO_MEM32;
-	up.port.flags = UPF_SHARE_IRQ | UPF_BOOT_AUTOCONF
-		| UPF_FIXED_PORT | UPF_FIXED_TYPE;
-	up.port.dev = dev;
-	up.port.private_data = priv;
-
-	/* Check for a fixed line number */
-	ret = of_alias_get_id(np, "serial");
-	if (ret >= 0)
-		up.port.line = ret;
-
 	/* setup HR timer */
 	hrtimer_init(&priv->hrt, CLOCK_MONOTONIC, HRTIMER_MODE_ABS);
 	priv->hrt.function = brcmuart_hrtimer_func;
diff --git a/drivers/tty/serial/8250/8250_dw.c b/drivers/tty/serial/8250/8250_dw.c
index 2d1f350a4b..a58890fd53 100644
--- a/drivers/tty/serial/8250/8250_dw.c
+++ b/drivers/tty/serial/8250/8250_dw.c
@@ -9,7 +9,6 @@
  * LCR is written whilst busy.  If it is, then a busy detect interrupt is
  * raised, the LCR needs to be rewritten and the uart status register read.
  */
-#include <linux/acpi.h>
 #include <linux/clk.h>
 #include <linux/delay.h>
 #include <linux/device.h>
@@ -17,7 +16,6 @@
 #include <linux/mod_devicetable.h>
 #include <linux/module.h>
 #include <linux/notifier.h>
-#include <linux/of.h>
 #include <linux/platform_device.h>
 #include <linux/pm_runtime.h>
 #include <linux/property.h>
@@ -56,6 +54,35 @@
 #define DW_UART_QUIRK_ARMADA_38X	BIT(1)
 #define DW_UART_QUIRK_SKIP_SET_RATE	BIT(2)
 #define DW_UART_QUIRK_IS_DMA_FC		BIT(3)
+#define DW_UART_QUIRK_APMC0D08		BIT(4)
+#define DW_UART_QUIRK_CPR_VALUE		BIT(5)
+
+struct dw8250_platform_data {
+	u8 usr_reg;
+	u32 cpr_value;
+	unsigned int quirks;
+};
+
+struct dw8250_data {
+	struct dw8250_port_data	data;
+	const struct dw8250_platform_data *pdata;
+
+	int			msr_mask_on;
+	int			msr_mask_off;
+	struct clk		*clk;
+	struct clk		*pclk;
+	struct notifier_block	clk_notifier;
+	struct work_struct	clk_work;
+	struct reset_control	*rst;
+
+	unsigned int		skip_autocfg:1;
+	unsigned int		uart_16550_compatible:1;
+};
+
+static inline struct dw8250_data *to_dw8250_data(struct dw8250_port_data *data)
+{
+	return container_of(data, struct dw8250_data, data);
+}
 
 static inline struct dw8250_data *clk_to_dw8250_data(struct notifier_block *nb)
 {
@@ -445,44 +472,33 @@ static void dw8250_prepare_rx_dma(struct uart_8250_port *p)
 
 static void dw8250_quirks(struct uart_port *p, struct dw8250_data *data)
 {
-	struct device_node *np = p->dev->of_node;
+	unsigned int quirks = data->pdata ? data->pdata->quirks : 0;
+	u32 cpr_value = data->pdata ? data->pdata->cpr_value : 0;
 
-	if (np) {
-		unsigned int quirks = data->pdata->quirks;
-		int id;
+	if (quirks & DW_UART_QUIRK_CPR_VALUE)
+		data->data.cpr_value = cpr_value;
 
-		/* get index of serial line, if found in DT aliases */
-		id = of_alias_get_id(np, "serial");
-		if (id >= 0)
-			p->line = id;
 #ifdef CONFIG_64BIT
-		if (quirks & DW_UART_QUIRK_OCTEON) {
-			p->serial_in = dw8250_serial_inq;
-			p->serial_out = dw8250_serial_outq;
-			p->flags = UPF_SKIP_TEST | UPF_SHARE_IRQ | UPF_FIXED_TYPE;
-			p->type = PORT_OCTEON;
-			data->skip_autocfg = true;
-		}
+	if (quirks & DW_UART_QUIRK_OCTEON) {
+		p->serial_in = dw8250_serial_inq;
+		p->serial_out = dw8250_serial_outq;
+		p->flags = UPF_SKIP_TEST | UPF_SHARE_IRQ | UPF_FIXED_TYPE;
+		p->type = PORT_OCTEON;
+		data->skip_autocfg = true;
+	}
 #endif
 
-		if (of_device_is_big_endian(np)) {
-			p->iotype = UPIO_MEM32BE;
-			p->serial_in = dw8250_serial_in32be;
-			p->serial_out = dw8250_serial_out32be;
-		}
-
-		if (quirks & DW_UART_QUIRK_ARMADA_38X)
-			p->serial_out = dw8250_serial_out38x;
-		if (quirks & DW_UART_QUIRK_SKIP_SET_RATE)
-			p->set_termios = dw8250_do_set_termios;
-		if (quirks & DW_UART_QUIRK_IS_DMA_FC) {
-			data->data.dma.txconf.device_fc = 1;
-			data->data.dma.rxconf.device_fc = 1;
-			data->data.dma.prepare_tx_dma = dw8250_prepare_tx_dma;
-			data->data.dma.prepare_rx_dma = dw8250_prepare_rx_dma;
-		}
-
-	} else if (acpi_dev_present("APMC0D08", NULL, -1)) {
+	if (quirks & DW_UART_QUIRK_ARMADA_38X)
+		p->serial_out = dw8250_serial_out38x;
+	if (quirks & DW_UART_QUIRK_SKIP_SET_RATE)
+		p->set_termios = dw8250_do_set_termios;
+	if (quirks & DW_UART_QUIRK_IS_DMA_FC) {
+		data->data.dma.txconf.device_fc = 1;
+		data->data.dma.rxconf.device_fc = 1;
+		data->data.dma.prepare_tx_dma = dw8250_prepare_tx_dma;
+		data->data.dma.prepare_rx_dma = dw8250_prepare_rx_dma;
+	}
+	if (quirks & DW_UART_QUIRK_APMC0D08) {
 		p->iotype = UPIO_MEM32;
 		p->regshift = 2;
 		p->serial_in = dw8250_serial_in32;
@@ -510,39 +526,21 @@ static int dw8250_probe(struct platform_device *pdev)
 	struct device *dev = &pdev->dev;
 	struct dw8250_data *data;
 	struct resource *regs;
-	int irq;
 	int err;
-	u32 val;
 
 	regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	if (!regs)
 		return dev_err_probe(dev, -EINVAL, "no registers defined\n");
 
-	irq = platform_get_irq_optional(pdev, 0);
-	/* no interrupt -> fall back to polling */
-	if (irq == -ENXIO)
-		irq = 0;
-	if (irq < 0)
-		return irq;
-
 	spin_lock_init(&p->lock);
-	p->mapbase	= regs->start;
-	p->irq		= irq;
 	p->handle_irq	= dw8250_handle_irq;
 	p->pm		= dw8250_do_pm;
 	p->type		= PORT_8250;
-	p->flags	= UPF_SHARE_IRQ | UPF_FIXED_PORT;
+	p->flags	= UPF_FIXED_PORT;
 	p->dev		= dev;
-	p->iotype	= UPIO_MEM;
-	p->serial_in	= dw8250_serial_in;
-	p->serial_out	= dw8250_serial_out;
 	p->set_ldisc	= dw8250_set_ldisc;
 	p->set_termios	= dw8250_set_termios;
 
-	p->membase = devm_ioremap(dev, regs->start, resource_size(regs));
-	if (!p->membase)
-		return -ENOMEM;
-
 	data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
 	if (!data)
 		return -ENOMEM;
@@ -554,15 +552,35 @@ static int dw8250_probe(struct platform_device *pdev)
 	data->uart_16550_compatible = device_property_read_bool(dev,
 						"snps,uart-16550-compatible");
 
-	err = device_property_read_u32(dev, "reg-shift", &val);
-	if (!err)
-		p->regshift = val;
+	p->mapbase = regs->start;
+	p->mapsize = resource_size(regs);
 
-	err = device_property_read_u32(dev, "reg-io-width", &val);
-	if (!err && val == 4) {
-		p->iotype = UPIO_MEM32;
+	p->membase = devm_ioremap(dev, p->mapbase, p->mapsize);
+	if (!p->membase)
+		return -ENOMEM;
+
+	err = uart_read_port_properties(p);
+	/* no interrupt -> fall back to polling */
+	if (err == -ENXIO)
+		err = 0;
+	if (err)
+		return err;
+
+	switch (p->iotype) {
+	case UPIO_MEM:
+		p->serial_in = dw8250_serial_in;
+		p->serial_out = dw8250_serial_out;
+		break;
+	case UPIO_MEM32:
 		p->serial_in = dw8250_serial_in32;
 		p->serial_out = dw8250_serial_out32;
+		break;
+	case UPIO_MEM32BE:
+		p->serial_in = dw8250_serial_in32be;
+		p->serial_out = dw8250_serial_out32be;
+		break;
+	default:
+		return -ENODEV;
 	}
 
 	if (device_property_read_bool(dev, "dcd-override")) {
@@ -589,15 +607,13 @@ static int dw8250_probe(struct platform_device *pdev)
 		data->msr_mask_off |= UART_MSR_TERI;
 	}
 
-	/* Always ask for fixed clock rate from a property. */
-	device_property_read_u32(dev, "clock-frequency", &p->uartclk);
-
 	/* If there is separate baudclk, get the rate from it. */
 	data->clk = devm_clk_get_optional_enabled(dev, "baudclk");
 	if (data->clk == NULL)
 		data->clk = devm_clk_get_optional_enabled(dev, NULL);
 	if (IS_ERR(data->clk))
-		return PTR_ERR(data->clk);
+		return dev_err_probe(dev, PTR_ERR(data->clk),
+				     "failed to get baudclk\n");
 
 	INIT_WORK(&data->clk_work, dw8250_clk_work_cb);
 	data->clk_notifier.notifier_call = dw8250_clk_notifier_cb;
@@ -743,8 +759,8 @@ static const struct dw8250_platform_data dw8250_armada_38x_data = {
 
 static const struct dw8250_platform_data dw8250_renesas_rzn1_data = {
 	.usr_reg = DW_UART_USR,
-	.cpr_val = 0x00012f32,
-	.quirks = DW_UART_QUIRK_IS_DMA_FC,
+	.cpr_value = 0x00012f32,
+	.quirks = DW_UART_QUIRK_CPR_VALUE | DW_UART_QUIRK_IS_DMA_FC,
 };
 
 static const struct dw8250_platform_data dw8250_starfive_jh7100_data = {
@@ -762,13 +778,18 @@ static const struct of_device_id dw8250_of_match[] = {
 };
 MODULE_DEVICE_TABLE(of, dw8250_of_match);
 
+static const struct dw8250_platform_data dw8250_apmc0d08 = {
+	.usr_reg = DW_UART_USR,
+	.quirks = DW_UART_QUIRK_APMC0D08,
+};
+
 static const struct acpi_device_id dw8250_acpi_match[] = {
 	{ "80860F0A", (kernel_ulong_t)&dw8250_dw_apb },
 	{ "8086228A", (kernel_ulong_t)&dw8250_dw_apb },
 	{ "AMD0020", (kernel_ulong_t)&dw8250_dw_apb },
 	{ "AMDI0020", (kernel_ulong_t)&dw8250_dw_apb },
 	{ "AMDI0022", (kernel_ulong_t)&dw8250_dw_apb },
-	{ "APMC0D08", (kernel_ulong_t)&dw8250_dw_apb},
+	{ "APMC0D08", (kernel_ulong_t)&dw8250_apmc0d08 },
 	{ "BRCM2032", (kernel_ulong_t)&dw8250_dw_apb },
 	{ "HISI0031", (kernel_ulong_t)&dw8250_dw_apb },
 	{ "INT33C4", (kernel_ulong_t)&dw8250_dw_apb },
diff --git a/drivers/tty/serial/8250/8250_dwlib.c b/drivers/tty/serial/8250/8250_dwlib.c
index 3e33ddf7bc..5a2520943d 100644
--- a/drivers/tty/serial/8250/8250_dwlib.c
+++ b/drivers/tty/serial/8250/8250_dwlib.c
@@ -242,7 +242,6 @@ static const struct serial_rs485 dw8250_rs485_supported = {
 void dw8250_setup_port(struct uart_port *p)
 {
 	struct dw8250_port_data *pd = p->private_data;
-	struct dw8250_data *data = to_dw8250_data(pd);
 	struct uart_8250_port *up = up_to_u8250p(p);
 	u32 reg, old_dlf;
 
@@ -278,7 +277,7 @@ void dw8250_setup_port(struct uart_port *p)
 
 	reg = dw8250_readl_ext(p, DW_UART_CPR);
 	if (!reg) {
-		reg = data->pdata->cpr_val;
+		reg = pd->cpr_value;
 		dev_dbg(p->dev, "CPR is not available, using 0x%08x instead\n", reg);
 	}
 	if (!reg)
diff --git a/drivers/tty/serial/8250/8250_dwlib.h b/drivers/tty/serial/8250/8250_dwlib.h
index f13e91f2ca..7dd2a8e7b7 100644
--- a/drivers/tty/serial/8250/8250_dwlib.h
+++ b/drivers/tty/serial/8250/8250_dwlib.h
@@ -2,15 +2,10 @@
 /* Synopsys DesignWare 8250 library header file. */
 
 #include <linux/io.h>
-#include <linux/notifier.h>
 #include <linux/types.h>
-#include <linux/workqueue.h>
 
 #include "8250.h"
 
-struct clk;
-struct reset_control;
-
 struct dw8250_port_data {
 	/* Port properties */
 	int			line;
@@ -19,42 +14,16 @@ struct dw8250_port_data {
 	struct uart_8250_dma	dma;
 
 	/* Hardware configuration */
+	u32			cpr_value;
 	u8			dlf_size;
 
 	/* RS485 variables */
 	bool			hw_rs485_support;
 };
 
-struct dw8250_platform_data {
-	u8 usr_reg;
-	u32 cpr_val;
-	unsigned int quirks;
-};
-
-struct dw8250_data {
-	struct dw8250_port_data	data;
-	const struct dw8250_platform_data *pdata;
-
-	int			msr_mask_on;
-	int			msr_mask_off;
-	struct clk		*clk;
-	struct clk		*pclk;
-	struct notifier_block	clk_notifier;
-	struct work_struct	clk_work;
-	struct reset_control	*rst;
-
-	unsigned int		skip_autocfg:1;
-	unsigned int		uart_16550_compatible:1;
-};
-
 void dw8250_do_set_termios(struct uart_port *p, struct ktermios *termios, const struct ktermios *old);
 void dw8250_setup_port(struct uart_port *p);
 
-static inline struct dw8250_data *to_dw8250_data(struct dw8250_port_data *data)
-{
-	return container_of(data, struct dw8250_data, data);
-}
-
 static inline u32 dw8250_readl_ext(struct uart_port *p, int offset)
 {
 	if (p->iotype == UPIO_MEM32BE)
diff --git a/drivers/tty/serial/8250/8250_exar.c b/drivers/tty/serial/8250/8250_exar.c
index dab94835b6..4d1e07343d 100644
--- a/drivers/tty/serial/8250/8250_exar.c
+++ b/drivers/tty/serial/8250/8250_exar.c
@@ -6,23 +6,29 @@
  *
  *  Copyright (C) 2017 Sudip Mukherjee, All Rights Reserved.
  */
-#include <linux/acpi.h>
+#include <linux/bits.h>
+#include <linux/delay.h>
+#include <linux/device.h>
 #include <linux/dmi.h>
+#include <linux/interrupt.h>
 #include <linux/io.h>
-#include <linux/kernel.h>
+#include <linux/math.h>
 #include <linux/module.h>
 #include <linux/pci.h>
+#include <linux/platform_device.h>
+#include <linux/pm.h>
 #include <linux/property.h>
+#include <linux/string.h>
+#include <linux/types.h>
+
+#include <linux/serial_8250.h>
 #include <linux/serial_core.h>
 #include <linux/serial_reg.h>
-#include <linux/slab.h>
-#include <linux/string.h>
-#include <linux/tty.h>
-#include <linux/delay.h>
 
 #include <asm/byteorder.h>
 
 #include "8250.h"
+#include "8250_pcilib.h"
 
 #define PCI_DEVICE_ID_ACCESSIO_COM_2S		0x1052
 #define PCI_DEVICE_ID_ACCESSIO_COM_4S		0x105d
@@ -40,8 +46,50 @@
 #define PCI_DEVICE_ID_COMMTECH_4228PCIE		0x0021
 #define PCI_DEVICE_ID_COMMTECH_4222PCIE		0x0022
 
+#define PCI_VENDOR_ID_CONNECT_TECH				0x12c4
+#define PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_2_SP_OPTO        0x0340
+#define PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_4_SP_OPTO_A      0x0341
+#define PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_4_SP_OPTO_B      0x0342
+#define PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_2_XPRS           0x0350
+#define PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_4_XPRS_A         0x0351
+#define PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_4_XPRS_B         0x0352
+#define PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_8_XPRS           0x0353
+#define PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_16_XPRS_A        0x0354
+#define PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_16_XPRS_B        0x0355
+#define PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_2_XPRS_OPTO      0x0360
+#define PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_4_XPRS_OPTO_A    0x0361
+#define PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_4_XPRS_OPTO_B    0x0362
+#define PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_8_SP             0x0370
+#define PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_8_SP_232         0x0371
+#define PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_8_SP_485         0x0372
+#define PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_4_4_SP           0x0373
+#define PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_6_2_SP           0x0374
+#define PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_2_6_SP           0x0375
+#define PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_8_SP_232_NS      0x0376
+#define PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_2_XP_OPTO_LEFT   0x0380
+#define PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_2_XP_OPTO_RIGHT  0x0381
+#define PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_4_XP_OPTO        0x0382
+#define PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_4_4_XPRS_OPTO    0x0392
+#define PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_8_XPRS_LP        0x03A0
+#define PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_8_XPRS_LP_232    0x03A1
+#define PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_8_XPRS_LP_485    0x03A2
+#define PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_8_XPRS_LP_232_NS 0x03A3
+#define PCI_SUBDEVICE_ID_CONNECT_TECH_PCIE_XEG001               0x0602
+#define PCI_SUBDEVICE_ID_CONNECT_TECH_PCIE_XR35X_BASE           0x1000
+#define PCI_SUBDEVICE_ID_CONNECT_TECH_PCIE_XR35X_2              0x1002
+#define PCI_SUBDEVICE_ID_CONNECT_TECH_PCIE_XR35X_4              0x1004
+#define PCI_SUBDEVICE_ID_CONNECT_TECH_PCIE_XR35X_8              0x1008
+#define PCI_SUBDEVICE_ID_CONNECT_TECH_PCIE_XR35X_12             0x100C
+#define PCI_SUBDEVICE_ID_CONNECT_TECH_PCIE_XR35X_16             0x1010
+#define PCI_DEVICE_ID_CONNECT_TECH_PCI_XR79X_12_XIG00X          0x110c
+#define PCI_DEVICE_ID_CONNECT_TECH_PCI_XR79X_12_XIG01X          0x110d
+#define PCI_DEVICE_ID_CONNECT_TECH_PCI_XR79X_16                 0x1110
+
 #define PCI_DEVICE_ID_EXAR_XR17V4358		0x4358
 #define PCI_DEVICE_ID_EXAR_XR17V8358		0x8358
+#define PCI_DEVICE_ID_EXAR_XR17V252		0x0252
+#define PCI_DEVICE_ID_EXAR_XR17V254		0x0254
+#define PCI_DEVICE_ID_EXAR_XR17V258		0x0258
 
 #define PCI_SUBDEVICE_ID_USR_2980		0x0128
 #define PCI_SUBDEVICE_ID_USR_2981		0x0129
@@ -229,13 +277,12 @@ static int default_setup(struct exar8250 *priv, struct pci_dev *pcidev,
 			 struct uart_8250_port *port)
 {
 	const struct exar8250_board *board = priv->board;
-	unsigned int bar = 0;
 	unsigned char status;
+	int err;
 
-	port->port.iotype = UPIO_MEM;
-	port->port.mapbase = pci_resource_start(pcidev, bar) + offset;
-	port->port.membase = priv->virt + offset;
-	port->port.regshift = board->reg_shift;
+	err = serial8250_pci_setup_port(pcidev, port, 0, offset, board->reg_shift);
+	if (err)
+		return err;
 
 	/*
 	 * XR17V35x UARTs have an extra divisor register, DLD that gets enabled
@@ -375,7 +422,7 @@ static struct platform_device *__xr17v35x_register_gpio(struct pci_dev *pcidev,
 		return NULL;
 
 	pdev->dev.parent = &pcidev->dev;
-	ACPI_COMPANION_SET(&pdev->dev, ACPI_COMPANION(&pcidev->dev));
+	device_set_node(&pdev->dev, dev_fwnode(&pcidev->dev));
 
 	if (device_add_software_node(&pdev->dev, node) < 0 ||
 	    platform_device_add(pdev) < 0) {
@@ -713,14 +760,14 @@ exar_pci_probe(struct pci_dev *pcidev, const struct pci_device_id *ent)
 	uart.port.irq = pci_irq_vector(pcidev, 0);
 	uart.port.dev = &pcidev->dev;
 
+	/* Clear interrupts */
+	exar_misc_clear(priv);
+
 	rc = devm_request_irq(&pcidev->dev, uart.port.irq, exar_misc_handler,
 			 IRQF_SHARED, "exar_uart", priv);
 	if (rc)
 		return rc;
 
-	/* Clear interrupts */
-	exar_misc_clear(priv);
-
 	for (i = 0; i < nr_ports && i < maxnr; i++) {
 		rc = board->setup(priv, pcidev, &uart, i);
 		if (rc) {
@@ -758,10 +805,9 @@ static void exar_pci_remove(struct pci_dev *pcidev)
 		priv->board->exit(pcidev);
 }
 
-static int __maybe_unused exar_suspend(struct device *dev)
+static int exar_suspend(struct device *dev)
 {
-	struct pci_dev *pcidev = to_pci_dev(dev);
-	struct exar8250 *priv = pci_get_drvdata(pcidev);
+	struct exar8250 *priv = dev_get_drvdata(dev);
 	unsigned int i;
 
 	for (i = 0; i < priv->nr; i++)
@@ -771,7 +817,7 @@ static int __maybe_unused exar_suspend(struct device *dev)
 	return 0;
 }
 
-static int __maybe_unused exar_resume(struct device *dev)
+static int exar_resume(struct device *dev)
 {
 	struct exar8250 *priv = dev_get_drvdata(dev);
 	unsigned int i;
@@ -785,7 +831,7 @@ static int __maybe_unused exar_resume(struct device *dev)
 	return 0;
 }
 
-static SIMPLE_DEV_PM_OPS(exar_pci_pm, exar_suspend, exar_resume);
+static DEFINE_SIMPLE_DEV_PM_OPS(exar_pci_pm, exar_suspend, exar_resume);
 
 static const struct exar8250_board pbn_fastcom335_2 = {
 	.num_ports	= 2,
@@ -935,12 +981,13 @@ static struct pci_driver exar_pci_driver = {
 	.probe		= exar_pci_probe,
 	.remove		= exar_pci_remove,
 	.driver         = {
-		.pm     = &exar_pci_pm,
+		.pm     = pm_sleep_ptr(&exar_pci_pm),
 	},
 	.id_table	= exar_pci_tbl,
 };
 module_pci_driver(exar_pci_driver);
 
+MODULE_IMPORT_NS(SERIAL_8250_PCI);
 MODULE_LICENSE("GPL");
 MODULE_DESCRIPTION("Exar Serial Driver");
 MODULE_AUTHOR("Sudip Mukherjee <sudip.mukherjee@codethink.co.uk>");
diff --git a/drivers/tty/serial/8250/8250_ingenic.c b/drivers/tty/serial/8250/8250_ingenic.c
index a12f737924..a2783e38a2 100644
--- a/drivers/tty/serial/8250/8250_ingenic.c
+++ b/drivers/tty/serial/8250/8250_ingenic.c
@@ -234,7 +234,7 @@ static int ingenic_uart_probe(struct platform_device *pdev)
 	struct ingenic_uart_data *data;
 	const struct ingenic_uart_config *cdata;
 	struct resource *regs;
-	int irq, err, line;
+	int err;
 
 	cdata = of_device_get_match_data(&pdev->dev);
 	if (!cdata) {
@@ -242,10 +242,6 @@ static int ingenic_uart_probe(struct platform_device *pdev)
 		return -ENODEV;
 	}
 
-	irq = platform_get_irq(pdev, 0);
-	if (irq < 0)
-		return irq;
-
 	regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	if (!regs) {
 		dev_err(&pdev->dev, "no registers defined\n");
@@ -259,21 +255,19 @@ static int ingenic_uart_probe(struct platform_device *pdev)
 	spin_lock_init(&uart.port.lock);
 	uart.port.type = PORT_16550A;
 	uart.port.flags = UPF_SKIP_TEST | UPF_IOREMAP | UPF_FIXED_TYPE;
-	uart.port.iotype = UPIO_MEM;
 	uart.port.mapbase = regs->start;
-	uart.port.regshift = 2;
 	uart.port.serial_out = ingenic_uart_serial_out;
 	uart.port.serial_in = ingenic_uart_serial_in;
-	uart.port.irq = irq;
 	uart.port.dev = &pdev->dev;
-	uart.port.fifosize = cdata->fifosize;
 	uart.tx_loadsz = cdata->tx_loadsz;
 	uart.capabilities = UART_CAP_FIFO | UART_CAP_RTOIE;
 
-	/* Check for a fixed line number */
-	line = of_alias_get_id(pdev->dev.of_node, "serial");
-	if (line >= 0)
-		uart.port.line = line;
+	err = uart_read_port_properties(&uart.port);
+	if (err)
+		return err;
+
+	uart.port.regshift = 2;
+	uart.port.fifosize = cdata->fifosize;
 
 	uart.port.membase = devm_ioremap(&pdev->dev, regs->start,
 					 resource_size(regs));
diff --git a/drivers/tty/serial/8250/8250_lpc18xx.c b/drivers/tty/serial/8250/8250_lpc18xx.c
index 8d728a6a59..47e1a056a6 100644
--- a/drivers/tty/serial/8250/8250_lpc18xx.c
+++ b/drivers/tty/serial/8250/8250_lpc18xx.c
@@ -92,11 +92,7 @@ static int lpc18xx_serial_probe(struct platform_device *pdev)
 	struct lpc18xx_uart_data *data;
 	struct uart_8250_port uart;
 	struct resource *res;
-	int irq, ret;
-
-	irq = platform_get_irq(pdev, 0);
-	if (irq < 0)
-		return irq;
+	int ret;
 
 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	if (!res) {
@@ -139,19 +135,12 @@ static int lpc18xx_serial_probe(struct platform_device *pdev)
 		goto dis_clk_reg;
 	}
 
-	ret = of_alias_get_id(pdev->dev.of_node, "serial");
-	if (ret >= 0)
-		uart.port.line = ret;
-
 	data->dma.rx_param = data;
 	data->dma.tx_param = data;
 
 	spin_lock_init(&uart.port.lock);
 	uart.port.dev = &pdev->dev;
-	uart.port.irq = irq;
-	uart.port.iotype = UPIO_MEM32;
 	uart.port.mapbase = res->start;
-	uart.port.regshift = 2;
 	uart.port.type = PORT_16550A;
 	uart.port.flags = UPF_FIXED_PORT | UPF_FIXED_TYPE | UPF_SKIP_TEST;
 	uart.port.uartclk = clk_get_rate(data->clk_uart);
@@ -160,6 +149,13 @@ static int lpc18xx_serial_probe(struct platform_device *pdev)
 	uart.port.rs485_supported = lpc18xx_rs485_supported;
 	uart.port.serial_out = lpc18xx_uart_serial_out;
 
+	ret = uart_read_port_properties(&uart.port);
+	if (ret)
+		goto dis_uart_clk;
+
+	uart.port.iotype = UPIO_MEM32;
+	uart.port.regshift = 2;
+
 	uart.dma = &data->dma;
 	uart.dma->rxconf.src_maxburst = 1;
 	uart.dma->txconf.dst_maxburst = 1;
diff --git a/drivers/tty/serial/8250/8250_of.c b/drivers/tty/serial/8250/8250_of.c
index 9dcc17e332..5d1dd992d8 100644
--- a/drivers/tty/serial/8250/8250_of.c
+++ b/drivers/tty/serial/8250/8250_of.c
@@ -69,37 +69,22 @@ static int of_platform_serial_setup(struct platform_device *ofdev,
 	struct device *dev = &ofdev->dev;
 	struct device_node *np = dev->of_node;
 	struct uart_port *port = &up->port;
-	u32 clk, spd, prop;
-	int ret, irq;
+	u32 spd;
+	int ret;
 
 	memset(port, 0, sizeof *port);
 
 	pm_runtime_enable(&ofdev->dev);
 	pm_runtime_get_sync(&ofdev->dev);
 
-	if (of_property_read_u32(np, "clock-frequency", &clk)) {
-
-		/* Get clk rate through clk driver if present */
-		info->clk = devm_clk_get_enabled(dev, NULL);
-		if (IS_ERR(info->clk)) {
-			ret = dev_err_probe(dev, PTR_ERR(info->clk), "failed to get clock\n");
-			goto err_pmruntime;
-		}
-
-		clk = clk_get_rate(info->clk);
-	}
-	/* If current-speed was set, then try not to change it. */
-	if (of_property_read_u32(np, "current-speed", &spd) == 0)
-		port->custom_divisor = clk / (16 * spd);
-
 	ret = of_address_to_resource(np, 0, &resource);
 	if (ret) {
 		dev_err_probe(dev, ret, "invalid address\n");
 		goto err_pmruntime;
 	}
 
-	port->flags = UPF_SHARE_IRQ | UPF_BOOT_AUTOCONF | UPF_FIXED_PORT |
-				  UPF_FIXED_TYPE;
+	port->dev = &ofdev->dev;
+	port->flags = UPF_BOOT_AUTOCONF | UPF_FIXED_PORT | UPF_FIXED_TYPE;
 	spin_lock_init(&port->lock);
 
 	if (resource_type(&resource) == IORESOURCE_IO) {
@@ -108,70 +93,31 @@ static int of_platform_serial_setup(struct platform_device *ofdev,
 	} else {
 		port->mapbase = resource.start;
 		port->mapsize = resource_size(&resource);
+		port->flags |= UPF_IOREMAP;
+	}
 
-		/* Check for shifted address mapping */
-		if (of_property_read_u32(np, "reg-offset", &prop) == 0) {
-			if (prop >= port->mapsize) {
-				ret = dev_err_probe(dev, -EINVAL, "reg-offset %u exceeds region size %pa\n",
-						    prop, &port->mapsize);
-				goto err_pmruntime;
-			}
+	ret = uart_read_and_validate_port_properties(port);
+	if (ret)
+		goto err_pmruntime;
 
-			port->mapbase += prop;
-			port->mapsize -= prop;
+	/* Get clk rate through clk driver if present */
+	if (!port->uartclk) {
+		info->clk = devm_clk_get_enabled(dev, NULL);
+		if (IS_ERR(info->clk)) {
+			ret = dev_err_probe(dev, PTR_ERR(info->clk), "failed to get clock\n");
+			goto err_pmruntime;
 		}
 
-		port->iotype = UPIO_MEM;
-		if (of_property_read_u32(np, "reg-io-width", &prop) == 0) {
-			switch (prop) {
-			case 1:
-				port->iotype = UPIO_MEM;
-				break;
-			case 2:
-				port->iotype = UPIO_MEM16;
-				break;
-			case 4:
-				port->iotype = of_device_is_big_endian(np) ?
-					       UPIO_MEM32BE : UPIO_MEM32;
-				break;
-			default:
-				ret = dev_err_probe(dev, -EINVAL, "unsupported reg-io-width (%u)\n",
-						    prop);
-				goto err_pmruntime;
-			}
-		}
-		port->flags |= UPF_IOREMAP;
+		port->uartclk = clk_get_rate(info->clk);
 	}
+	/* If current-speed was set, then try not to change it. */
+	if (of_property_read_u32(np, "current-speed", &spd) == 0)
+		port->custom_divisor = port->uartclk / (16 * spd);
 
 	/* Compatibility with the deprecated pxa driver and 8250_pxa drivers. */
 	if (of_device_is_compatible(np, "mrvl,mmp-uart"))
 		port->regshift = 2;
 
-	/* Check for registers offset within the devices address range */
-	if (of_property_read_u32(np, "reg-shift", &prop) == 0)
-		port->regshift = prop;
-
-	/* Check for fifo size */
-	if (of_property_read_u32(np, "fifo-size", &prop) == 0)
-		port->fifosize = prop;
-
-	/* Check for a fixed line number */
-	ret = of_alias_get_id(np, "serial");
-	if (ret >= 0)
-		port->line = ret;
-
-	irq = of_irq_get(np, 0);
-	if (irq < 0) {
-		if (irq == -EPROBE_DEFER) {
-			ret = -EPROBE_DEFER;
-			goto err_pmruntime;
-		}
-		/* IRQ support not mandatory */
-		irq = 0;
-	}
-
-	port->irq = irq;
-
 	info->rst = devm_reset_control_get_optional_shared(&ofdev->dev, NULL);
 	if (IS_ERR(info->rst)) {
 		ret = PTR_ERR(info->rst);
@@ -183,12 +129,6 @@ static int of_platform_serial_setup(struct platform_device *ofdev,
 		goto err_pmruntime;
 
 	port->type = type;
-	port->uartclk = clk;
-
-	if (of_property_read_bool(np, "no-loopback-test"))
-		port->flags |= UPF_SKIP_TEST;
-
-	port->dev = &ofdev->dev;
 	port->rs485_config = serial8250_em485_config;
 	port->rs485_supported = serial8250_em485_supported;
 	up->rs485_start_tx = serial8250_em485_start_tx;
@@ -280,7 +220,6 @@ static int of_platform_serial_probe(struct platform_device *ofdev)
 	platform_set_drvdata(ofdev, info);
 	return 0;
 err_dispose:
-	irq_dispose_mapping(port8250.port.irq);
 	pm_runtime_put_sync(&ofdev->dev);
 	pm_runtime_disable(&ofdev->dev);
 err_free:
diff --git a/drivers/tty/serial/8250/8250_omap.c b/drivers/tty/serial/8250/8250_omap.c
index 6942990a33..66901d9308 100644
--- a/drivers/tty/serial/8250/8250_omap.c
+++ b/drivers/tty/serial/8250/8250_omap.c
@@ -1394,11 +1394,7 @@ static int omap8250_probe(struct platform_device *pdev)
 	struct uart_8250_port up;
 	struct resource *regs;
 	void __iomem *membase;
-	int irq, ret;
-
-	irq = platform_get_irq(pdev, 0);
-	if (irq < 0)
-		return irq;
+	int ret;
 
 	regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	if (!regs) {
@@ -1419,7 +1415,6 @@ static int omap8250_probe(struct platform_device *pdev)
 	up.port.dev = &pdev->dev;
 	up.port.mapbase = regs->start;
 	up.port.membase = membase;
-	up.port.irq = irq;
 	/*
 	 * It claims to be 16C750 compatible however it is a little different.
 	 * It has EFR and has no FCR7_64byte bit. The AFE (which it claims to
@@ -1429,13 +1424,9 @@ static int omap8250_probe(struct platform_device *pdev)
 	 * or pm callback.
 	 */
 	up.port.type = PORT_8250;
-	up.port.iotype = UPIO_MEM;
-	up.port.flags = UPF_FIXED_PORT | UPF_FIXED_TYPE | UPF_SOFT_FLOW |
-		UPF_HARD_FLOW;
+	up.port.flags = UPF_FIXED_PORT | UPF_FIXED_TYPE | UPF_SOFT_FLOW | UPF_HARD_FLOW;
 	up.port.private_data = priv;
 
-	up.port.regshift = OMAP_UART_REGSHIFT;
-	up.port.fifosize = 64;
 	up.tx_loadsz = 64;
 	up.capabilities = UART_CAP_FIFO;
 #ifdef CONFIG_PM
@@ -1461,14 +1452,14 @@ static int omap8250_probe(struct platform_device *pdev)
 	up.rs485_stop_tx = serial8250_em485_stop_tx;
 	up.port.has_sysrq = IS_ENABLED(CONFIG_SERIAL_8250_CONSOLE);
 
-	ret = of_alias_get_id(np, "serial");
-	if (ret < 0) {
-		dev_err(&pdev->dev, "failed to get alias\n");
+	ret = uart_read_port_properties(&up.port);
+	if (ret)
 		return ret;
-	}
-	up.port.line = ret;
 
-	if (of_property_read_u32(np, "clock-frequency", &up.port.uartclk)) {
+	up.port.regshift = OMAP_UART_REGSHIFT;
+	up.port.fifosize = 64;
+
+	if (!up.port.uartclk) {
 		struct clk *clk;
 
 		clk = devm_clk_get(&pdev->dev, NULL);
@@ -1560,8 +1551,8 @@ static int omap8250_probe(struct platform_device *pdev)
 	}
 #endif
 
-	irq_set_status_flags(irq, IRQ_NOAUTOEN);
-	ret = devm_request_irq(&pdev->dev, irq, omap8250_irq, 0,
+	irq_set_status_flags(up.port.irq, IRQ_NOAUTOEN);
+	ret = devm_request_irq(&pdev->dev, up.port.irq, omap8250_irq, 0,
 			       dev_name(&pdev->dev), priv);
 	if (ret < 0)
 		return ret;
diff --git a/drivers/tty/serial/8250/8250_pci.c b/drivers/tty/serial/8250/8250_pci.c
index 0d35c77fad..e2e4f99f9d 100644
--- a/drivers/tty/serial/8250/8250_pci.c
+++ b/drivers/tty/serial/8250/8250_pci.c
@@ -5010,12 +5010,6 @@ static const struct pci_device_id serial_pci_tbl[] = {
 	{	PCI_VENDOR_ID_LAVA, PCI_DEVICE_ID_LAVA_QUATRO_B,
 		PCI_ANY_ID, PCI_ANY_ID, 0, 0,
 		pbn_b0_bt_2_115200 },
-	{	PCI_VENDOR_ID_LAVA, PCI_DEVICE_ID_LAVA_QUATTRO_A,
-		PCI_ANY_ID, PCI_ANY_ID, 0, 0,
-		pbn_b0_bt_2_115200 },
-	{	PCI_VENDOR_ID_LAVA, PCI_DEVICE_ID_LAVA_QUATTRO_B,
-		PCI_ANY_ID, PCI_ANY_ID, 0, 0,
-		pbn_b0_bt_2_115200 },
 	{	PCI_VENDOR_ID_LAVA, PCI_DEVICE_ID_LAVA_OCTO_A,
 		PCI_ANY_ID, PCI_ANY_ID, 0, 0,
 		pbn_b0_bt_4_460800 },
diff --git a/drivers/tty/serial/8250/8250_pci1xxxx.c b/drivers/tty/serial/8250/8250_pci1xxxx.c
index 2dda737b16..2fbb5851f7 100644
--- a/drivers/tty/serial/8250/8250_pci1xxxx.c
+++ b/drivers/tty/serial/8250/8250_pci1xxxx.c
@@ -7,23 +7,31 @@
  *  Copyright (C) 2022 Microchip Technology Inc., All Rights Reserved.
  */
 
+#include <linux/array_size.h>
 #include <linux/bitfield.h>
-#include <linux/bitops.h>
-#include <linux/delay.h>
+#include <linux/bits.h>
+#include <linux/circ_buf.h>
+#include <linux/device.h>
+#include <linux/errno.h>
+#include <linux/gfp_types.h>
 #include <linux/io.h>
 #include <linux/iopoll.h>
-#include <linux/kernel.h>
+#include <linux/minmax.h>
 #include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/overflow.h>
 #include <linux/pci.h>
+#include <linux/pm.h>
 #include <linux/serial_core.h>
 #include <linux/serial_reg.h>
 #include <linux/serial_8250.h>
-#include <linux/slab.h>
+#include <linux/spinlock.h>
 #include <linux/string.h>
-#include <linux/units.h>
+#include <linux/time.h>
 #include <linux/tty.h>
 #include <linux/tty_flip.h>
-#include <linux/8250_pci.h>
+#include <linux/types.h>
+#include <linux/units.h>
 
 #include <asm/byteorder.h>
 
@@ -67,6 +75,7 @@
 #define SYSLOCK_RETRY_CNT			1000
 
 #define UART_RX_BYTE_FIFO			0x00
+#define UART_TX_BYTE_FIFO			0x00
 #define UART_FIFO_CTL				0x02
 
 #define UART_ACTV_REG				0x11
@@ -81,10 +90,10 @@
 #define ADCL_CFG_PIN_SEL			BIT(1)
 #define ADCL_CFG_EN				BIT(0)
 
-#define UART_BIT_SAMPLE_CNT			16
+#define UART_BIT_SAMPLE_CNT_8			8
+#define UART_BIT_SAMPLE_CNT_16			16
 #define BAUD_CLOCK_DIV_INT_MSK			GENMASK(31, 8)
 #define ADCL_CFG_RTS_DELAY_MASK			GENMASK(11, 8)
-#define UART_CLOCK_DEFAULT			(62500 * HZ_PER_KHZ)
 
 #define UART_WAKE_REG				0x8C
 #define UART_WAKE_MASK_REG			0x90
@@ -95,13 +104,19 @@
 	(UART_WAKE_N_PIN | UART_WAKE_NCTS | UART_WAKE_INT)
 
 #define UART_BAUD_CLK_DIVISOR_REG		0x54
+#define FRAC_DIV_CFG_REG			0x58
 
 #define UART_RESET_REG				0x94
 #define UART_RESET_D3_RESET_DISABLE		BIT(16)
 
 #define UART_BURST_STATUS_REG			0x9C
+#define UART_TX_BURST_FIFO			0xA0
 #define UART_RX_BURST_FIFO			0xA4
 
+#define UART_BIT_DIVISOR_8			0x26731000
+#define UART_BIT_DIVISOR_16			0x6ef71000
+#define UART_BAUD_4MBPS				4000000
+
 #define MAX_PORTS				4
 #define PORT_OFFSET				0x100
 #define RX_BUF_SIZE				512
@@ -109,6 +124,7 @@
 #define UART_BURST_SIZE				4
 
 #define UART_BST_STAT_RX_COUNT_MASK		0x00FF
+#define UART_BST_STAT_TX_COUNT_MASK		0xFF00
 #define UART_BST_STAT_IIR_INT_PEND		0x100000
 #define UART_LSR_OVERRUN_ERR_CLR		0x43
 #define UART_BST_STAT_LSR_RX_MASK		0x9F000000
@@ -116,6 +132,7 @@
 #define UART_BST_STAT_LSR_OVERRUN_ERR		0x2000000
 #define UART_BST_STAT_LSR_PARITY_ERR		0x4000000
 #define UART_BST_STAT_LSR_FRAME_ERR		0x8000000
+#define UART_BST_STAT_LSR_THRE			0x20000000
 
 struct pci1xxxx_8250 {
 	unsigned int nr;
@@ -206,15 +223,21 @@ static int pci1xxxx_get_num_ports(struct pci_dev *dev)
 static unsigned int pci1xxxx_get_divisor(struct uart_port *port,
 					 unsigned int baud, unsigned int *frac)
 {
+	unsigned int uart_sample_cnt;
 	unsigned int quot;
 
+	if (baud >= UART_BAUD_4MBPS)
+		uart_sample_cnt = UART_BIT_SAMPLE_CNT_8;
+	else
+		uart_sample_cnt = UART_BIT_SAMPLE_CNT_16;
+
 	/*
 	 * Calculate baud rate sampling period in nanoseconds.
 	 * Fractional part x denotes x/255 parts of a nanosecond.
 	 */
-	quot = NSEC_PER_SEC / (baud * UART_BIT_SAMPLE_CNT);
-	*frac = (NSEC_PER_SEC - quot * baud * UART_BIT_SAMPLE_CNT) *
-		  255 / UART_BIT_SAMPLE_CNT / baud;
+	quot = NSEC_PER_SEC / (baud * uart_sample_cnt);
+	*frac = (NSEC_PER_SEC - quot * baud * uart_sample_cnt) *
+		  255 / uart_sample_cnt / baud;
 
 	return quot;
 }
@@ -222,6 +245,11 @@ static unsigned int pci1xxxx_get_divisor(struct uart_port *port,
 static void pci1xxxx_set_divisor(struct uart_port *port, unsigned int baud,
 				 unsigned int quot, unsigned int frac)
 {
+	if (baud >= UART_BAUD_4MBPS)
+		writel(UART_BIT_DIVISOR_8, port->membase + FRAC_DIV_CFG_REG);
+	else
+		writel(UART_BIT_DIVISOR_16, port->membase + FRAC_DIV_CFG_REG);
+
 	writel(FIELD_PREP(BAUD_CLOCK_DIV_INT_MSK, quot) | frac,
 	       port->membase + UART_BAUD_CLK_DIVISOR_REG);
 }
@@ -233,7 +261,16 @@ static int pci1xxxx_rs485_config(struct uart_port *port,
 	u32 delay_in_baud_periods;
 	u32 baud_period_in_ns;
 	u32 mode_cfg = 0;
+	u32 sample_cnt;
 	u32 clock_div;
+	u32 frac_div;
+
+	frac_div = readl(port->membase + FRAC_DIV_CFG_REG);
+
+	if (frac_div == UART_BIT_DIVISOR_16)
+		sample_cnt = UART_BIT_SAMPLE_CNT_16;
+	else
+		sample_cnt = UART_BIT_SAMPLE_CNT_8;
 
 	/*
 	 * pci1xxxx's uart hardware supports only RTS delay after
@@ -249,7 +286,7 @@ static int pci1xxxx_rs485_config(struct uart_port *port,
 			clock_div = readl(port->membase + UART_BAUD_CLK_DIVISOR_REG);
 			baud_period_in_ns =
 				FIELD_GET(BAUD_CLOCK_DIV_INT_MSK, clock_div) *
-				UART_BIT_SAMPLE_CNT;
+				sample_cnt;
 			delay_in_baud_periods =
 				rs485->delay_rts_after_send * NSEC_PER_MSEC /
 				baud_period_in_ns;
@@ -344,6 +381,105 @@ static void pci1xxxx_rx_burst(struct uart_port *port, u32 uart_status)
 	}
 }
 
+static void pci1xxxx_process_write_data(struct uart_port *port,
+					struct circ_buf *xmit,
+					int *data_empty_count,
+					u32 *valid_byte_count)
+{
+	u32 valid_burst_count = *valid_byte_count / UART_BURST_SIZE;
+
+	/*
+	 * Each transaction transfers data in DWORDs. If there are less than
+	 * four remaining valid_byte_count to transfer or if the circular
+	 * buffer has insufficient space for a DWORD, the data is transferred
+	 * one byte at a time.
+	 */
+	while (valid_burst_count) {
+		if (*data_empty_count - UART_BURST_SIZE < 0)
+			break;
+		if (xmit->tail > (UART_XMIT_SIZE - UART_BURST_SIZE))
+			break;
+		writel(*(unsigned int *)&xmit->buf[xmit->tail],
+		       port->membase + UART_TX_BURST_FIFO);
+		*valid_byte_count -= UART_BURST_SIZE;
+		*data_empty_count -= UART_BURST_SIZE;
+		valid_burst_count -= UART_BYTE_SIZE;
+
+		xmit->tail = (xmit->tail + UART_BURST_SIZE) &
+			     (UART_XMIT_SIZE - 1);
+	}
+
+	while (*valid_byte_count) {
+		if (*data_empty_count - UART_BYTE_SIZE < 0)
+			break;
+		writeb(xmit->buf[xmit->tail], port->membase +
+		       UART_TX_BYTE_FIFO);
+		*data_empty_count -= UART_BYTE_SIZE;
+		*valid_byte_count -= UART_BYTE_SIZE;
+
+		/*
+		 * When the tail of the circular buffer is reached, the next
+		 * byte is transferred to the beginning of the buffer.
+		 */
+		xmit->tail = (xmit->tail + UART_BYTE_SIZE) &
+			     (UART_XMIT_SIZE - 1);
+
+		/*
+		 * If there are any pending burst count, data is handled by
+		 * transmitting DWORDs at a time.
+		 */
+		if (valid_burst_count && (xmit->tail <
+		   (UART_XMIT_SIZE - UART_BURST_SIZE)))
+			break;
+	}
+}
+
+static void pci1xxxx_tx_burst(struct uart_port *port, u32 uart_status)
+{
+	struct uart_8250_port *up = up_to_u8250p(port);
+	u32 valid_byte_count;
+	int data_empty_count;
+	struct circ_buf *xmit;
+
+	xmit = &port->state->xmit;
+
+	if (port->x_char) {
+		writeb(port->x_char, port->membase + UART_TX);
+		port->icount.tx++;
+		port->x_char = 0;
+		return;
+	}
+
+	if ((uart_tx_stopped(port)) || (uart_circ_empty(xmit))) {
+		port->ops->stop_tx(port);
+	} else {
+		data_empty_count = (pci1xxxx_read_burst_status(port) &
+				    UART_BST_STAT_TX_COUNT_MASK) >> 8;
+		do {
+			valid_byte_count = uart_circ_chars_pending(xmit);
+
+			pci1xxxx_process_write_data(port, xmit,
+						    &data_empty_count,
+						    &valid_byte_count);
+
+			port->icount.tx++;
+			if (uart_circ_empty(xmit))
+				break;
+		} while (data_empty_count && valid_byte_count);
+	}
+
+	if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
+		uart_write_wakeup(port);
+
+	 /*
+	  * With RPM enabled, we have to wait until the FIFO is empty before
+	  * the HW can go idle. So we get here once again with empty FIFO and
+	  * disable the interrupt and RPM in __stop_tx()
+	  */
+	if (uart_circ_empty(xmit) && !(up->capabilities & UART_CAP_RPM))
+		port->ops->stop_tx(port);
+}
+
 static int pci1xxxx_handle_irq(struct uart_port *port)
 {
 	unsigned long flags;
@@ -359,6 +495,9 @@ static int pci1xxxx_handle_irq(struct uart_port *port)
 	if (status & UART_BST_STAT_LSR_RX_MASK)
 		pci1xxxx_rx_burst(port, status);
 
+	if (status & UART_BST_STAT_LSR_THRE)
+		pci1xxxx_tx_burst(port, status);
+
 	spin_unlock_irqrestore(&port->lock, flags);
 
 	return 1;
@@ -481,6 +620,17 @@ static int pci1xxxx_setup(struct pci_dev *pdev,
 
 	port->port.flags |= UPF_FIXED_TYPE | UPF_SKIP_TEST;
 	port->port.type = PORT_MCHP16550A;
+	/*
+	 * 8250 core considers prescaller value to be always 16.
+	 * The MCHP ports support downscaled mode and hence the
+	 * functional UART clock can be lower, i.e. 62.5MHz, than
+	 * software expects in order to support higher baud rates.
+	 * Assign here 64MHz to support 4Mbps.
+	 *
+	 * The value itself is not really used anywhere except baud
+	 * rate calculations, so we can mangle it as we wish.
+	 */
+	port->port.uartclk = 64 * HZ_PER_MHZ;
 	port->port.set_termios = serial8250_do_set_termios;
 	port->port.get_divisor = pci1xxxx_get_divisor;
 	port->port.set_divisor = pci1xxxx_set_divisor;
@@ -594,7 +744,6 @@ static int pci1xxxx_serial_probe(struct pci_dev *pdev,
 
 	memset(&uart, 0, sizeof(uart));
 	uart.port.flags = UPF_SHARE_IRQ | UPF_FIXED_PORT;
-	uart.port.uartclk = UART_CLOCK_DEFAULT;
 	uart.port.dev = dev;
 
 	if (num_vectors == max_vec_reqd)
diff --git a/drivers/tty/serial/8250/8250_port.c b/drivers/tty/serial/8250/8250_port.c
index c0c34e410c..fc9dd5d452 100644
--- a/drivers/tty/serial/8250/8250_port.c
+++ b/drivers/tty/serial/8250/8250_port.c
@@ -2684,12 +2684,8 @@ static unsigned int serial8250_get_baud_rate(struct uart_port *port,
  */
 void serial8250_update_uartclk(struct uart_port *port, unsigned int uartclk)
 {
-	struct uart_8250_port *up = up_to_u8250p(port);
 	struct tty_port *tport = &port->state->port;
-	unsigned int baud, quot, frac = 0;
-	struct ktermios *termios;
 	struct tty_struct *tty;
-	unsigned long flags;
 
 	tty = tty_port_tty_get(tport);
 	if (!tty) {
@@ -2710,21 +2706,7 @@ void serial8250_update_uartclk(struct uart_port *port, unsigned int uartclk)
 	if (!tty_port_initialized(tport))
 		goto out_unlock;
 
-	termios = &tty->termios;
-
-	baud = serial8250_get_baud_rate(port, termios, NULL);
-	quot = serial8250_get_divisor(port, baud, &frac);
-
-	serial8250_rpm_get(up);
-	uart_port_lock_irqsave(port, &flags);
-
-	uart_update_timeout(port, termios->c_cflag, baud);
-
-	serial8250_set_divisor(port, baud, quot, frac);
-	serial_port_out(port, UART_LCR, up->lcr);
-
-	uart_port_unlock_irqrestore(port, flags);
-	serial8250_rpm_put(up);
+	serial8250_do_set_termios(port, &tty->termios, NULL);
 
 out_unlock:
 	mutex_unlock(&tport->mutex);
diff --git a/drivers/tty/serial/8250/8250_pxa.c b/drivers/tty/serial/8250/8250_pxa.c
index 77686da42c..ba96fa913e 100644
--- a/drivers/tty/serial/8250/8250_pxa.c
+++ b/drivers/tty/serial/8250/8250_pxa.c
@@ -92,11 +92,7 @@ static int serial_pxa_probe(struct platform_device *pdev)
 	struct uart_8250_port uart = {};
 	struct pxa8250_data *data;
 	struct resource *mmres;
-	int irq, ret;
-
-	irq = platform_get_irq(pdev, 0);
-	if (irq < 0)
-		return irq;
+	int ret;
 
 	mmres = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	if (!mmres)
@@ -114,21 +110,22 @@ static int serial_pxa_probe(struct platform_device *pdev)
 	if (ret)
 		return ret;
 
-	ret = of_alias_get_id(pdev->dev.of_node, "serial");
-	if (ret >= 0)
-		uart.port.line = ret;
-
 	uart.port.type = PORT_XSCALE;
-	uart.port.iotype = UPIO_MEM32;
 	uart.port.mapbase = mmres->start;
-	uart.port.regshift = 2;
-	uart.port.irq = irq;
-	uart.port.fifosize = 64;
 	uart.port.flags = UPF_IOREMAP | UPF_SKIP_TEST | UPF_FIXED_TYPE;
 	uart.port.dev = &pdev->dev;
 	uart.port.uartclk = clk_get_rate(data->clk);
 	uart.port.pm = serial_pxa_pm;
 	uart.port.private_data = data;
+
+	ret = uart_read_port_properties(&uart.port);
+	if (ret)
+		return ret;
+
+	uart.port.iotype = UPIO_MEM32;
+	uart.port.regshift = 2;
+	uart.port.fifosize = 64;
+	uart.tx_loadsz = 32;
 	uart.dl_write = serial_pxa_dl_write;
 
 	ret = serial8250_register_8250_port(&uart);
diff --git a/drivers/tty/serial/8250/8250_tegra.c b/drivers/tty/serial/8250/8250_tegra.c
index ba352262df..60a80d00d2 100644
--- a/drivers/tty/serial/8250/8250_tegra.c
+++ b/drivers/tty/serial/8250/8250_tegra.c
@@ -57,25 +57,11 @@ static int tegra_uart_probe(struct platform_device *pdev)
 	port = &port8250.port;
 	spin_lock_init(&port->lock);
 
-	port->flags = UPF_SHARE_IRQ | UPF_BOOT_AUTOCONF | UPF_FIXED_PORT |
-		      UPF_FIXED_TYPE;
-	port->iotype = UPIO_MEM32;
-	port->regshift = 2;
+	port->flags = UPF_BOOT_AUTOCONF | UPF_FIXED_PORT | UPF_FIXED_TYPE;
 	port->type = PORT_TEGRA;
-	port->irqflags |= IRQF_SHARED;
 	port->dev = &pdev->dev;
 	port->handle_break = tegra_uart_handle_break;
 
-	ret = of_alias_get_id(pdev->dev.of_node, "serial");
-	if (ret >= 0)
-		port->line = ret;
-
-	ret = platform_get_irq(pdev, 0);
-	if (ret < 0)
-		return ret;
-
-	port->irq = ret;
-
 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	if (!res)
 		return -ENODEV;
@@ -88,12 +74,18 @@ static int tegra_uart_probe(struct platform_device *pdev)
 	port->mapbase = res->start;
 	port->mapsize = resource_size(res);
 
+	ret = uart_read_port_properties(port);
+	if (ret)
+		return ret;
+
+	port->iotype = UPIO_MEM32;
+	port->regshift = 2;
+
 	uart->rst = devm_reset_control_get_optional_shared(&pdev->dev, NULL);
 	if (IS_ERR(uart->rst))
 		return PTR_ERR(uart->rst);
 
-	if (device_property_read_u32(&pdev->dev, "clock-frequency",
-				     &port->uartclk)) {
+	if (!port->uartclk) {
 		uart->clk = devm_clk_get(&pdev->dev, NULL);
 		if (IS_ERR(uart->clk)) {
 			dev_err(&pdev->dev, "failed to get clock!\n");
diff --git a/drivers/tty/serial/8250/8250_uniphier.c b/drivers/tty/serial/8250/8250_uniphier.c
index 6399a38ecc..670d2ca0f7 100644
--- a/drivers/tty/serial/8250/8250_uniphier.c
+++ b/drivers/tty/serial/8250/8250_uniphier.c
@@ -162,7 +162,6 @@ static int uniphier_uart_probe(struct platform_device *pdev)
 	struct uniphier8250_priv *priv;
 	struct resource *regs;
 	void __iomem *membase;
-	int irq;
 	int ret;
 
 	regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
@@ -175,23 +174,12 @@ static int uniphier_uart_probe(struct platform_device *pdev)
 	if (!membase)
 		return -ENOMEM;
 
-	irq = platform_get_irq(pdev, 0);
-	if (irq < 0)
-		return irq;
-
 	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
 	if (!priv)
 		return -ENOMEM;
 
 	memset(&up, 0, sizeof(up));
 
-	ret = of_alias_get_id(dev->of_node, "serial");
-	if (ret < 0) {
-		dev_err(dev, "failed to get alias id\n");
-		return ret;
-	}
-	up.port.line = ret;
-
 	priv->clk = devm_clk_get(dev, NULL);
 	if (IS_ERR(priv->clk)) {
 		dev_err(dev, "failed to get clock\n");
@@ -211,7 +199,10 @@ static int uniphier_uart_probe(struct platform_device *pdev)
 	up.port.mapbase = regs->start;
 	up.port.mapsize = resource_size(regs);
 	up.port.membase = membase;
-	up.port.irq = irq;
+
+	ret = uart_read_port_properties(&up.port);
+	if (ret)
+		return ret;
 
 	up.port.type = PORT_16550A;
 	up.port.iotype = UPIO_MEM32;
diff --git a/drivers/tty/serial/8250/Kconfig b/drivers/tty/serial/8250/Kconfig
index 8b9a2c4902..47ff50763c 100644
--- a/drivers/tty/serial/8250/Kconfig
+++ b/drivers/tty/serial/8250/Kconfig
@@ -149,6 +149,7 @@ config SERIAL_8250_PCI
 config SERIAL_8250_EXAR
 	tristate "8250/16550 Exar/Commtech PCI/PCIe device support"
 	depends on SERIAL_8250 && PCI
+	select SERIAL_8250_PCILIB
 	default SERIAL_8250
 	help
 	  This builds support for XR17C1xx, XR17V3xx and some Commtech