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path: root/drivers/tty/serial/sc16is7xx_spi.c
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Diffstat (limited to 'drivers/tty/serial/sc16is7xx_spi.c')
-rw-r--r--drivers/tty/serial/sc16is7xx_spi.c90
1 files changed, 90 insertions, 0 deletions
diff --git a/drivers/tty/serial/sc16is7xx_spi.c b/drivers/tty/serial/sc16is7xx_spi.c
new file mode 100644
index 0000000000..73df36f8a7
--- /dev/null
+++ b/drivers/tty/serial/sc16is7xx_spi.c
@@ -0,0 +1,90 @@
+// SPDX-License-Identifier: GPL-2.0+
+/* SC16IS7xx SPI interface driver */
+
+#include <linux/dev_printk.h>
+#include <linux/mod_devicetable.h>
+#include <linux/module.h>
+#include <linux/regmap.h>
+#include <linux/spi/spi.h>
+#include <linux/string.h>
+#include <linux/units.h>
+
+#include "sc16is7xx.h"
+
+/* SPI definitions */
+#define SC16IS7XX_SPI_READ_BIT BIT(7)
+
+static int sc16is7xx_spi_probe(struct spi_device *spi)
+{
+ const struct sc16is7xx_devtype *devtype;
+ struct regmap *regmaps[SC16IS7XX_MAX_PORTS];
+ struct regmap_config regcfg;
+ unsigned int i;
+ int ret;
+
+ /* Setup SPI bus */
+ spi->bits_per_word = 8;
+ /* For all variants, only mode 0 is supported */
+ if ((spi->mode & SPI_MODE_X_MASK) != SPI_MODE_0)
+ return dev_err_probe(&spi->dev, -EINVAL, "Unsupported SPI mode\n");
+
+ spi->mode = spi->mode ? : SPI_MODE_0;
+ spi->max_speed_hz = spi->max_speed_hz ? : 4 * HZ_PER_MHZ;
+ ret = spi_setup(spi);
+ if (ret)
+ return ret;
+
+ devtype = spi_get_device_match_data(spi);
+ if (!devtype)
+ return dev_err_probe(&spi->dev, -ENODEV, "Failed to match device\n");
+
+ memcpy(&regcfg, &sc16is7xx_regcfg, sizeof(struct regmap_config));
+
+ for (i = 0; i < devtype->nr_uart; i++) {
+ regcfg.name = sc16is7xx_regmap_name(i);
+ /*
+ * If read_flag_mask is 0, the regmap code sets it to a default
+ * of 0x80. Since we specify our own mask, we must add the READ
+ * bit ourselves:
+ */
+ regcfg.read_flag_mask = sc16is7xx_regmap_port_mask(i) |
+ SC16IS7XX_SPI_READ_BIT;
+ regcfg.write_flag_mask = sc16is7xx_regmap_port_mask(i);
+ regmaps[i] = devm_regmap_init_spi(spi, &regcfg);
+ }
+
+ return sc16is7xx_probe(&spi->dev, devtype, regmaps, spi->irq);
+}
+
+static void sc16is7xx_spi_remove(struct spi_device *spi)
+{
+ sc16is7xx_remove(&spi->dev);
+}
+
+static const struct spi_device_id sc16is7xx_spi_id_table[] = {
+ { "sc16is74x", (kernel_ulong_t)&sc16is74x_devtype, },
+ { "sc16is740", (kernel_ulong_t)&sc16is74x_devtype, },
+ { "sc16is741", (kernel_ulong_t)&sc16is74x_devtype, },
+ { "sc16is750", (kernel_ulong_t)&sc16is750_devtype, },
+ { "sc16is752", (kernel_ulong_t)&sc16is752_devtype, },
+ { "sc16is760", (kernel_ulong_t)&sc16is760_devtype, },
+ { "sc16is762", (kernel_ulong_t)&sc16is762_devtype, },
+ { }
+};
+MODULE_DEVICE_TABLE(spi, sc16is7xx_spi_id_table);
+
+static struct spi_driver sc16is7xx_spi_driver = {
+ .driver = {
+ .name = SC16IS7XX_NAME,
+ .of_match_table = sc16is7xx_dt_ids,
+ },
+ .probe = sc16is7xx_spi_probe,
+ .remove = sc16is7xx_spi_remove,
+ .id_table = sc16is7xx_spi_id_table,
+};
+
+module_spi_driver(sc16is7xx_spi_driver);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("SC16IS7xx SPI interface driver");
+MODULE_IMPORT_NS(SERIAL_NXP_SC16IS7XX);