Add the base Ricoh RN5T568 PMIC driver

Link: https://lore.barebox.org/20220118082122.73204-1-jbe@pengutronix.de
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

3 files changed, 172 insertions, 0 deletions

diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
index 8468a2d1d1..160248072a 100644
--- a/drivers/mfd/Kconfig
+++ b/drivers/mfd/Kconfig
@@ -68,6 +68,12 @@ config MFD_STPMIC1
 	help
 	  Select this to support communication with the STPMIC1.
 
+config MFD_RN568PMIC
+	depends on I2C
+	bool "Ricoh RN5T568 MFD driver"
+	help
+	  Select this to support communication with the Ricoh RN5T568 PMIC.
+
 config MFD_SUPERIO
 	bool
 
diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
index 2bcf90078a..50f54cfcf2 100644
--- a/drivers/mfd/Makefile
+++ b/drivers/mfd/Makefile
@@ -13,6 +13,7 @@ obj-$(CONFIG_MFD_TWL4030)	+= twl4030.o
 obj-$(CONFIG_MFD_TWL6030)	+= twl6030.o
 obj-$(CONFIG_RAVE_SP_CORE)	+= rave-sp.o
 obj-$(CONFIG_MFD_STPMIC1)	+= stpmic1.o
+obj-$(CONFIG_MFD_RN568PMIC)	+= rn5t568.o
 obj-$(CONFIG_MFD_SUPERIO)	+= superio.o
 obj-$(CONFIG_FINTEK_SUPERIO)	+= fintek-superio.o
 obj-$(CONFIG_SMSC_SUPERIO)	+= smsc-superio.o
diff --git a/drivers/mfd/rn5t568.c b/drivers/mfd/rn5t568.c
new file mode 100644
index 0000000000..c1c792cbec
--- /dev/null
+++ b/drivers/mfd/rn5t568.c
@@ -0,0 +1,165 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * MFD core driver for Ricoh RN5T618 PMIC
+ * Note: Manufacturer is now Nisshinbo Micro Devices Inc.
+ *
+ * Copyright (C) 2014 Beniamino Galvani <b.galvani@gmail.com>
+ * Copyright (C) 2016 Toradex AG
+ */
+
+#include <common.h>
+#include <driver.h>
+#include <errno.h>
+#include <i2c/i2c.h>
+#include <init.h>
+#include <of.h>
+#include <regmap.h>
+#include <reset_source.h>
+#include <restart.h>
+
+#define RN5T568_LSIVER 0x00
+#define RN5T568_OTPVER 0x01
+#define RN5T568_PONHIS 0x09
+# define RN5T568_PONHIS_ON_EXTINPON BIT(3)
+# define RN5T568_PONHIS_ON_REPWRPON BIT(1)
+# define RN5T568_PONHIS_ON_PWRONPON BIT(0)
+#define RN5T568_POFFHIS 0x0a
+# define RN5T568_POFFHIS_N_OEPOFF BIT(7)
+# define RN5T568_POFFHIS_DCLIMPOFF BIT(6)
+# define RN5T568_POFFHIS_WDGPOFF BIT(5)
+# define RN5T568_POFFHIS_CPUPOFF BIT(4)
+# define RN5T568_POFFHIS_IODETPOFF BIT(3)
+# define RN5T568_POFFHIS_VINDETPOFF BIT(2)
+# define RN5T568_POFFHIS_TSHUTPOFF BIT(1)
+# define RN5T568_POFFHIS_PWRONPOFF BIT(0)
+#define RN5T568_SLPCNT 0x0e
+# define RN5T568_SLPCNT_SWPPWROFF BIT(0)
+#define RN5T568_REPCNT 0x0f
+# define RN5T568_REPCNT_OFF_RESETO_16MS 0x30
+# define RN5T568_REPCNT_OFF_REPWRTIM_1000MS 0x06
+# define RN5T568_REPCNT_OFF_REPWRON BIT(0)
+#define RN5T568_MAX_REG 0xbc
+
+struct rn5t568 {
+	struct restart_handler restart;
+	struct regmap *regmap;
+};
+
+static void rn5t568_restart(struct restart_handler *rst)
+{
+	struct rn5t568 *rn5t568 = container_of(rst, struct rn5t568, restart);
+
+	regmap_write(rn5t568->regmap, RN5T568_SLPCNT, RN5T568_SLPCNT_SWPPWROFF);
+}
+
+static int rn5t568_reset_reason_detect(struct device_d *dev, struct regmap *regmap)
+{
+	unsigned int reg;
+	int ret;
+
+	ret = regmap_read(regmap, RN5T568_PONHIS, &reg);
+	if (ret)
+		return ret;
+
+	dev_dbg(dev, "Power-on history: %x\n", reg);
+
+	if (reg == 0) {
+		dev_info(dev, "No power-on reason available\n");
+		return 0;
+	}
+
+	if (reg & RN5T568_PONHIS_ON_EXTINPON) {
+		reset_source_set_device(dev, RESET_POR);
+		return 0;
+	} else if (reg & RN5T568_PONHIS_ON_PWRONPON) {
+		reset_source_set_device(dev, RESET_POR);
+		return 0;
+	} else if (!(reg & RN5T568_PONHIS_ON_REPWRPON))
+		return -EINVAL;
+
+	ret = regmap_read(regmap, RN5T568_POFFHIS, &reg);
+	if (ret)
+		return ret;
+
+	dev_dbg(dev, "Power-off history: %x\n", reg);
+
+	if (reg & RN5T568_POFFHIS_PWRONPOFF)
+		reset_source_set_device(dev, RESET_POR);
+	else if (reg & RN5T568_POFFHIS_TSHUTPOFF)
+		reset_source_set_device(dev, RESET_THERM);
+	else if (reg & RN5T568_POFFHIS_VINDETPOFF)
+		reset_source_set_device(dev, RESET_BROWNOUT);
+	else if (reg & RN5T568_POFFHIS_IODETPOFF)
+		reset_source_set_device(dev, RESET_UKWN);
+	else if (reg & RN5T568_POFFHIS_CPUPOFF)
+		reset_source_set_device(dev, RESET_RST);
+	else if (reg & RN5T568_POFFHIS_WDGPOFF)
+		reset_source_set_device(dev, RESET_WDG);
+	else if (reg & RN5T568_POFFHIS_DCLIMPOFF)
+		reset_source_set_device(dev, RESET_BROWNOUT);
+	else if (reg & RN5T568_POFFHIS_N_OEPOFF)
+		reset_source_set_device(dev, RESET_EXT);
+	else
+		return -EINVAL;
+
+	return 0;
+}
+
+static const struct regmap_config rn5t568_regmap_config = {
+	.reg_bits	= 8,
+	.val_bits	= 8,
+	.max_register	= RN5T568_MAX_REG,
+};
+
+static int __init rn5t568_i2c_probe(struct device_d *dev)
+{
+	struct rn5t568 *pmic_instance;
+	unsigned char reg[2];
+	int ret;
+
+	pmic_instance = xzalloc(sizeof(struct rn5t568));
+	pmic_instance->regmap = regmap_init_i2c(to_i2c_client(dev), &rn5t568_regmap_config);
+	if (IS_ERR(pmic_instance->regmap))
+		return PTR_ERR(pmic_instance->regmap);
+
+	ret = regmap_register_cdev(pmic_instance->regmap, NULL);
+	if (ret)
+		return ret;
+
+	ret = regmap_bulk_read(pmic_instance->regmap, RN5T568_LSIVER, &reg, 2);
+	if (ret) {
+		dev_err(dev, "Failed to read PMIC version via I2C\n");
+		return ret;
+	}
+
+	dev_info(dev, "Found NMD RN5T568 LSI %x, OTP: %x\n", reg[0], reg[1]);
+
+	/* Settings used to trigger software reset and by a watchdog trigger */
+	regmap_write(pmic_instance->regmap, RN5T568_REPCNT, RN5T568_REPCNT_OFF_RESETO_16MS |
+		     RN5T568_REPCNT_OFF_REPWRTIM_1000MS | RN5T568_REPCNT_OFF_REPWRON);
+
+	pmic_instance->restart.priority = of_get_restart_priority(dev->device_node);
+	pmic_instance->restart.name = "RN5T568";
+	pmic_instance->restart.restart = &rn5t568_restart;
+	restart_handler_register(&pmic_instance->restart);
+	dev_dbg(dev, "RN5t: Restart handler with priority %d registered\n", pmic_instance->restart.priority);
+
+	ret = rn5t568_reset_reason_detect(dev, pmic_instance->regmap);
+	if (ret)
+		dev_warn(dev, "Failed to query reset reason\n");
+
+	return of_platform_populate(dev->device_node, NULL, dev);
+}
+
+static __maybe_unused const struct of_device_id rn5t568_of_match[] = {
+	{ .compatible = "ricoh,rn5t568", .data = NULL, },
+	{ }
+};
+
+static struct driver_d rn5t568_i2c_driver = {
+	.name		= "rn5t568-i2c",
+	.probe		= rn5t568_i2c_probe,
+	.of_compatible	= DRV_OF_COMPAT(rn5t568_of_match),
+};
+
+coredevice_i2c_driver(rn5t568_i2c_driver);