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-rw-r--r--drivers/mfd/max77714.c152
1 files changed, 152 insertions, 0 deletions
diff --git a/drivers/mfd/max77714.c b/drivers/mfd/max77714.c
new file mode 100644
index 000000000..143a432ea
--- /dev/null
+++ b/drivers/mfd/max77714.c
@@ -0,0 +1,152 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Maxim MAX77714 Core Driver
+ *
+ * Copyright (C) 2022 Luca Ceresoli
+ * Author: Luca Ceresoli <luca.ceresoli@bootlin.com>
+ */
+
+#include <linux/i2c.h>
+#include <linux/interrupt.h>
+#include <linux/mfd/core.h>
+#include <linux/mfd/max77714.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/regmap.h>
+
+static const struct mfd_cell max77714_cells[] = {
+ { .name = "max77714-watchdog" },
+ { .name = "max77714-rtc" },
+};
+
+static const struct regmap_range max77714_readable_ranges[] = {
+ regmap_reg_range(MAX77714_INT_TOP, MAX77714_INT_TOP),
+ regmap_reg_range(MAX77714_INT_TOPM, MAX77714_INT_TOPM),
+ regmap_reg_range(MAX77714_32K_STATUS, MAX77714_32K_CONFIG),
+ regmap_reg_range(MAX77714_CNFG_GLBL2, MAX77714_CNFG2_ONOFF),
+};
+
+static const struct regmap_range max77714_writable_ranges[] = {
+ regmap_reg_range(MAX77714_INT_TOPM, MAX77714_INT_TOPM),
+ regmap_reg_range(MAX77714_32K_CONFIG, MAX77714_32K_CONFIG),
+ regmap_reg_range(MAX77714_CNFG_GLBL2, MAX77714_CNFG2_ONOFF),
+};
+
+static const struct regmap_access_table max77714_readable_table = {
+ .yes_ranges = max77714_readable_ranges,
+ .n_yes_ranges = ARRAY_SIZE(max77714_readable_ranges),
+};
+
+static const struct regmap_access_table max77714_writable_table = {
+ .yes_ranges = max77714_writable_ranges,
+ .n_yes_ranges = ARRAY_SIZE(max77714_writable_ranges),
+};
+
+static const struct regmap_config max77714_regmap_config = {
+ .reg_bits = 8,
+ .val_bits = 8,
+ .max_register = MAX77714_CNFG2_ONOFF,
+ .rd_table = &max77714_readable_table,
+ .wr_table = &max77714_writable_table,
+};
+
+static const struct regmap_irq max77714_top_irqs[] = {
+ REGMAP_IRQ_REG(MAX77714_IRQ_TOP_ONOFF, 0, MAX77714_INT_TOP_ONOFF),
+ REGMAP_IRQ_REG(MAX77714_IRQ_TOP_RTC, 0, MAX77714_INT_TOP_RTC),
+ REGMAP_IRQ_REG(MAX77714_IRQ_TOP_GPIO, 0, MAX77714_INT_TOP_GPIO),
+ REGMAP_IRQ_REG(MAX77714_IRQ_TOP_LDO, 0, MAX77714_INT_TOP_LDO),
+ REGMAP_IRQ_REG(MAX77714_IRQ_TOP_SD, 0, MAX77714_INT_TOP_SD),
+ REGMAP_IRQ_REG(MAX77714_IRQ_TOP_GLBL, 0, MAX77714_INT_TOP_GLBL),
+};
+
+static const struct regmap_irq_chip max77714_irq_chip = {
+ .name = "max77714-pmic",
+ .status_base = MAX77714_INT_TOP,
+ .mask_base = MAX77714_INT_TOPM,
+ .num_regs = 1,
+ .irqs = max77714_top_irqs,
+ .num_irqs = ARRAY_SIZE(max77714_top_irqs),
+};
+
+/*
+ * MAX77714 initially uses the internal, low precision oscillator. Enable
+ * the external oscillator by setting the XOSC_RETRY bit. If the external
+ * oscillator is not OK (probably not installed) this has no effect.
+ */
+static int max77714_setup_xosc(struct device *dev, struct regmap *regmap)
+{
+ /* Internal Crystal Load Capacitance, indexed by value of 32KLOAD bits */
+ static const unsigned int load_cap[4] = {0, 10, 12, 22}; /* pF */
+ unsigned int load_cap_idx;
+ unsigned int status;
+ int err;
+
+ err = regmap_update_bits(regmap, MAX77714_32K_CONFIG,
+ MAX77714_32K_CONFIG_XOSC_RETRY,
+ MAX77714_32K_CONFIG_XOSC_RETRY);
+ if (err)
+ return dev_err_probe(dev, err, "Failed to configure the external oscillator\n");
+
+ err = regmap_read(regmap, MAX77714_32K_STATUS, &status);
+ if (err)
+ return dev_err_probe(dev, err, "Failed to read external oscillator status\n");
+
+ load_cap_idx = (status >> MAX77714_32K_STATUS_32KLOAD_SHF)
+ & MAX77714_32K_STATUS_32KLOAD_MSK;
+
+ dev_info(dev, "Using %s oscillator, %d pF load cap\n",
+ status & MAX77714_32K_STATUS_32KSOURCE ? "internal" : "external",
+ load_cap[load_cap_idx]);
+
+ return 0;
+}
+
+static int max77714_probe(struct i2c_client *client)
+{
+ struct device *dev = &client->dev;
+ struct regmap *regmap;
+ struct regmap_irq_chip_data *irq_data;
+ int err;
+
+ regmap = devm_regmap_init_i2c(client, &max77714_regmap_config);
+ if (IS_ERR(regmap))
+ return dev_err_probe(dev, PTR_ERR(regmap),
+ "Failed to initialise regmap\n");
+
+ err = max77714_setup_xosc(dev, regmap);
+ if (err)
+ return err;
+
+ err = devm_regmap_add_irq_chip(dev, regmap, client->irq,
+ IRQF_ONESHOT | IRQF_SHARED, 0,
+ &max77714_irq_chip, &irq_data);
+ if (err)
+ return dev_err_probe(dev, err, "Failed to add PMIC IRQ chip\n");
+
+ err = devm_mfd_add_devices(dev, PLATFORM_DEVID_NONE,
+ max77714_cells, ARRAY_SIZE(max77714_cells),
+ NULL, 0, NULL);
+ if (err)
+ return dev_err_probe(dev, err, "Failed to register child devices\n");
+
+ return 0;
+}
+
+static const struct of_device_id max77714_dt_match[] = {
+ { .compatible = "maxim,max77714" },
+ {},
+};
+MODULE_DEVICE_TABLE(of, max77714_dt_match);
+
+static struct i2c_driver max77714_driver = {
+ .driver = {
+ .name = "max77714",
+ .of_match_table = max77714_dt_match,
+ },
+ .probe_new = max77714_probe,
+};
+module_i2c_driver(max77714_driver);
+
+MODULE_DESCRIPTION("Maxim MAX77714 MFD core driver");
+MODULE_AUTHOR("Luca Ceresoli <luca.ceresoli@bootlin.com>");
+MODULE_LICENSE("GPL");