[PATCH v2 1/2] Add the base Ricoh RN5T568 PMIC driver
Juergen Borleis
jbe at pengutronix.de
Tue Jan 18 00:21:21 PST 2022
---
drivers/mfd/Kconfig | 6 ++
drivers/mfd/Makefile | 1 +
drivers/mfd/rn5t568.c | 165 ++++++++++++++++++++++++++++++++++++++++++
3 files changed, 172 insertions(+)
create mode 100644 drivers/mfd/rn5t568.c
diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
index 8468a2d..1602480 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 2bcf900..50f54cf 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 0000000..c1c792c
--- /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 at 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, ®);
+ 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, ®);
+ 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, ®, 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);
--
2.30.2
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