hwmon: (pmbus) Add Renesas RAA229126 VR driver

Added pmbus driver for the new device Renesas raa229126
voltage regulator.

Signed-off-by: Zhikui Ren <zhikui.ren@intel.com>

3 files changed, 102 insertions, 0 deletions

diff --git a/drivers/hwmon/pmbus/Kconfig b/drivers/hwmon/pmbus/Kconfig
index b56bd8542864..960cc47f4e93 100644
--- a/drivers/hwmon/pmbus/Kconfig
+++ b/drivers/hwmon/pmbus/Kconfig
@@ -321,6 +321,15 @@ config SENSORS_Q54SJ108A2
 	  This driver can also be built as a module. If so, the module will
 	  be called q54sj108a2.
 
+config SENSORS_RAA229126
+	tristate "Renesas RAA229126"
+	help
+	  If you say yes here you get hardware monitoring support for Renesas
+	  RAA229126.
+
+	  This driver can also be built as a module. If so, the module will
+	  be called raa229126.
+
 config SENSORS_STPDDC60
 	tristate "ST STPDDC60"
 	help
diff --git a/drivers/hwmon/pmbus/Makefile b/drivers/hwmon/pmbus/Makefile
index 61cdc24b1309..09c73316c0bc 100644
--- a/drivers/hwmon/pmbus/Makefile
+++ b/drivers/hwmon/pmbus/Makefile
@@ -35,6 +35,7 @@ obj-$(CONFIG_SENSORS_MP5023)	+= mp5023.o
 obj-$(CONFIG_SENSORS_PM6764TR)	+= pm6764tr.o
 obj-$(CONFIG_SENSORS_PXE1610)	+= pxe1610.o
 obj-$(CONFIG_SENSORS_Q54SJ108A2)	+= q54sj108a2.o
+obj-$(CONFIG_SENSORS_RAA229126)	+= raa229126.o
 obj-$(CONFIG_SENSORS_STPDDC60)	+= stpddc60.o
 obj-$(CONFIG_SENSORS_TPS40422)	+= tps40422.o
 obj-$(CONFIG_SENSORS_TPS53679)	+= tps53679.o
diff --git a/drivers/hwmon/pmbus/raa229126.c b/drivers/hwmon/pmbus/raa229126.c
new file mode 100644
index 000000000000..cd2de3ceb5a2
--- /dev/null
+++ b/drivers/hwmon/pmbus/raa229126.c
@@ -0,0 +1,92 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Hardware monitoring driver for RAA229126
+ *
+ * Copyright (c) 2022 Intel Corporation.
+ */
+
+#include <linux/err.h>
+#include <linux/i2c.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+
+#include "pmbus.h"
+
+#define RAA229126_NUM_PAGES 2
+
+static struct pmbus_driver_info raa229126_info = {
+	.pages = RAA229126_NUM_PAGES,
+	.format[PSC_VOLTAGE_IN] = direct,
+	.format[PSC_VOLTAGE_OUT] = direct,
+	.format[PSC_CURRENT_IN] = direct,
+	.format[PSC_CURRENT_OUT] = direct,
+	.format[PSC_TEMPERATURE] = direct,
+	.format[PSC_POWER] = direct,
+	.m[PSC_TEMPERATURE] = 1,
+	.m[PSC_VOLTAGE_OUT] = 1,
+	.R[PSC_VOLTAGE_OUT] = 3,
+	.m[PSC_CURRENT_OUT] = 1,
+	.m[PSC_POWER] = 1,
+	.func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_VOUT | PMBUS_HAVE_IIN |
+		   PMBUS_HAVE_IOUT | PMBUS_HAVE_PIN | PMBUS_HAVE_POUT |
+		   PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_VOUT |
+		   PMBUS_HAVE_STATUS_IOUT | PMBUS_HAVE_STATUS_INPUT |
+		   PMBUS_HAVE_STATUS_TEMP,
+	.func[1] = PMBUS_HAVE_VIN | PMBUS_HAVE_VOUT | PMBUS_HAVE_IIN |
+		   PMBUS_HAVE_IOUT | PMBUS_HAVE_PIN | PMBUS_HAVE_POUT |
+		   PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_VOUT |
+		   PMBUS_HAVE_STATUS_IOUT | PMBUS_HAVE_STATUS_INPUT |
+		   PMBUS_HAVE_STATUS_TEMP,
+};
+
+static int raa229126_probe(struct i2c_client *client)
+{
+	struct pmbus_driver_info *info;
+	u8 buf[I2C_SMBUS_BLOCK_MAX];
+	int ret;
+
+	if (!i2c_check_functionality(client->adapter,
+				     I2C_FUNC_SMBUS_READ_BYTE_DATA |
+				     I2C_FUNC_SMBUS_READ_WORD_DATA |
+				     I2C_FUNC_SMBUS_READ_BLOCK_DATA))
+		return -ENODEV;
+
+	/* Read Manufacturer id */
+	ret = i2c_smbus_read_block_data(client, PMBUS_IC_DEVICE_ID, buf);
+	if (ret < 0) {
+		dev_err(&client->dev, "Failed to read PMBUS_IC_DEVICE_ID\n");
+		return ret;
+	}
+	if (ret != 4 || strncmp(buf, "\x00\x82\xd2\x49", 4)) {
+		dev_err(&client->dev, "DEVICE_ID unrecognized\n");
+		return -ENODEV;
+	}
+
+	info = devm_kmemdup(&client->dev, &raa229126_info, sizeof(*info), GFP_KERNEL);
+	if (!info)
+		return -ENOMEM;
+
+	return pmbus_do_probe(client, info);
+}
+
+static const struct i2c_device_id raa229126_id[] = {
+	{"raa229126", 0},
+	{}
+};
+
+MODULE_DEVICE_TABLE(i2c, raa229126_id);
+
+static struct i2c_driver raa229126_driver = {
+	.driver = {
+		   .name = "raa229126",
+		   },
+	.probe_new = raa229126_probe,
+	.id_table = raa229126_id,
+};
+
+module_i2c_driver(raa229126_driver);
+
+MODULE_AUTHOR("Zhikui Ren <zhikui.ren@intel.com>");
+MODULE_DESCRIPTION("PMBus driver for Renesas RAA229126");
+MODULE_LICENSE("GPL");
+MODULE_IMPORT_NS(PMBUS);