The RAA215300 is a 9-channel PMIC that consists of
* Internally compensated regulators
* built-in Real Time Clock (RTC)
* 32kHz crystal oscillator
* coin cell battery charger
The RTC on RAA215300 is similar to the IP found in the ISL1208.
The existing driver for the ISL1208 works for this PMIC too,
however the RAA215300 exposes two devices via I2C, one for the RTC
IP, and one for everything else. The RTC IP has to be enabled
by the other I2C device, therefore this driver is necessary to get
the RTC to work.
The external oscillator bit is inverted on PMIC version 0x11.
Add PMIC RAA215300 driver for enabling RTC block and instantiating
RTC device based on PMIC version.
Signed-off-by: Biju Das <biju.das.jz@xxxxxxxxxxxxxx>
---
v5->v6:
* Updated the driver header comment block in C++ style
* Dropped cache for registers.
* Dropped check for I2C functionality
v4->v5:
* Dropped clk.h and started using of_property_present to check the
clocks.
v3->v4:
* Moved from mfd->regulator as it doesn't use MFD APIs
* Dropped handling "renesas,rtc-enabled" property and instead used
clock-names to determine RTC is enabled or not and then instantiating
RTC device.
v2->v3:
* Updated commit description
* Added support for handling "renesas,rtc-enabled" property.
* Based on PMIC version, it instantiates rtc device by calling i2c_new_
ancillary_device().
RFC->V2:
* Dropped MODULE_SOFTDEP from the driver as it is added in RTC platform
driver.
---
drivers/regulator/Kconfig | 7 +++
drivers/regulator/Makefile | 1 +
drivers/regulator/raa215300.c | 92 +++++++++++++++++++++++++++++++++++
3 files changed, 100 insertions(+)
create mode 100644 drivers/regulator/raa215300.c
diff --git a/drivers/regulator/Kconfig b/drivers/regulator/Kconfig
index 7bbaf5991268..99fd45ae2625 100644
--- a/drivers/regulator/Kconfig
+++ b/drivers/regulator/Kconfig
@@ -1033,6 +1033,13 @@ config REGULATOR_QCOM_USB_VBUS
Say M here if you want to include support for enabling the VBUS output
as a module. The module will be named "qcom_usb_vbus_regulator".
+config REGULATOR_RAA215300
+ tristate "Renesas RAA215300 driver"
+ select REGMAP_I2C
+ depends on I2C
+ help
+ Support for the Renesas RAA215300 PMIC.
+
config REGULATOR_RASPBERRYPI_TOUCHSCREEN_ATTINY
tristate "Raspberry Pi 7-inch touchscreen panel ATTINY regulator"
depends on BACKLIGHT_CLASS_DEVICE
diff --git a/drivers/regulator/Makefile b/drivers/regulator/Makefile
index 0b3ad1b0a999..320a08a596b7 100644
--- a/drivers/regulator/Makefile
+++ b/drivers/regulator/Makefile
@@ -124,6 +124,7 @@ obj-$(CONFIG_REGULATOR_TPS51632) += tps51632-regulator.o
obj-$(CONFIG_REGULATOR_PBIAS) += pbias-regulator.o
obj-$(CONFIG_REGULATOR_PCAP) += pcap-regulator.o
obj-$(CONFIG_REGULATOR_PCF50633) += pcf50633-regulator.o
+obj-$(CONFIG_REGULATOR_RAA215300) += raa215300.o
obj-$(CONFIG_REGULATOR_RASPBERRYPI_TOUCHSCREEN_ATTINY) += rpi-panel-attiny-regulator.o
obj-$(CONFIG_REGULATOR_RC5T583) += rc5t583-regulator.o
obj-$(CONFIG_REGULATOR_RK808) += rk808-regulator.o
diff --git a/drivers/regulator/raa215300.c b/drivers/regulator/raa215300.c
new file mode 100644
index 000000000000..78a239154c7b
--- /dev/null
+++ b/drivers/regulator/raa215300.c
@@ -0,0 +1,92 @@
+// SPDX-License-Identifier: GPL-2.0
+//
+// Renesas RAA215300 PMIC driver
+//
+// Copyright (C) 2023 Renesas Electronics Corporation
+//
+
+#include <linux/err.h>
+#include <linux/i2c.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/regmap.h>
+
+#define RAA215300_REG_BLOCK_EN 0x6c
+#define RAA215300_HW_REV 0xf8
+
+#define RAA215300_RTC_DEFAULT_ADDR 0x6f
+#define RAA215300_REG_BLOCK_EN_RTC_EN BIT(6)
+
+static const struct regmap_config raa215300_regmap_config = {
+ .reg_bits = 8,
+ .val_bits = 8,
+ .max_register = 0xff,
+};
+
+static void raa215300_rtc_unregister_device(void *data)
+{
+ i2c_unregister_device(data);
+}
+
+static int raa215300_i2c_probe(struct i2c_client *client)
+{
+ struct device *dev = &client->dev;
+ unsigned int pmic_version;
+ struct regmap *regmap;
+ int ret;
+
+ regmap = devm_regmap_init_i2c(client, &raa215300_regmap_config);
+ if (IS_ERR(regmap))
+ return dev_err_probe(dev, PTR_ERR(regmap),
+ "regmap i2c init failed\n");
+
+ ret = regmap_read(regmap, RAA215300_HW_REV, &pmic_version);
+ if (ret < 0)
+ return dev_err_probe(dev, ret, "HW rev read failed\n");
+
+ dev_dbg(dev, "RAA215300 PMIC version 0x%04x\n", pmic_version);
+
+ if (of_property_present(client->dev.of_node, "clocks")) {
+ struct i2c_client *rtc_client;
+
+ /* Enable RTC block */
+ regmap_update_bits(regmap, RAA215300_REG_BLOCK_EN,
+ RAA215300_REG_BLOCK_EN_RTC_EN,
+ RAA215300_REG_BLOCK_EN_RTC_EN);
+
+ rtc_client = i2c_new_ancillary_device(client, "rtc",
+ RAA215300_RTC_DEFAULT_ADDR,
+ pmic_version >= 0x12 ?
+ "isl1208" : "raa215300_a0");
+ if (IS_ERR(rtc_client))
+ return PTR_ERR(rtc_client);
+
+ ret = devm_add_action_or_reset(dev,
+ raa215300_rtc_unregister_device,
+ rtc_client);
+ if (ret < 0)
+ return ret;
+ }
+
+ return 0;
+}
+
+static const struct of_device_id raa215300_dt_match[] = {
+ { .compatible = "renesas,raa215300" },
+ { /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, raa215300_dt_match);
+
+static struct i2c_driver raa215300_i2c_driver = {
+ .driver = {
+ .name = "raa215300",
+ .of_match_table = raa215300_dt_match,
+ },
+ .probe_new = raa215300_i2c_probe,
+};
+module_i2c_driver(raa215300_i2c_driver);
+
+MODULE_DESCRIPTION("Renesas RAA215300 PMIC driver");
+MODULE_AUTHOR("Fabrizio Castro <fabrizio.castro.jz@xxxxxxxxxxx>");
+MODULE_AUTHOR("Biju Das <biju.das.jz@xxxxxxxxxxxxxx>");
+MODULE_LICENSE("GPL");
--
2.25.1
