hwmon: (pmbus) Add driver for the TEXAS TPS546D24 Buck Converter.

Add the pmbus driver for TEXAS tps546d24 Buck Converter.
The vout mode of tps546d24 supported relative data format,
which is not supported by the PMBus core.

Signed-off-by: Duke Du <dukedu83@gmail.com>
Link: https://lore.kernel.org/r/1662951668-9849-1-git-send-email-Duke.Du@quantatw.com
[groeck: Add __maybe_unused to tps546d24_of_match declaration]
Signed-off-by: Guenter Roeck <linux@roeck-us.net>

3 files changed, 81 insertions, 0 deletions

diff --git a/drivers/hwmon/pmbus/Kconfig b/drivers/hwmon/pmbus/Kconfig
index 951e4a9ff2d6..89668af67206 100644
--- a/drivers/hwmon/pmbus/Kconfig
+++ b/drivers/hwmon/pmbus/Kconfig
@@ -397,6 +397,15 @@ config SENSORS_TPS53679
 	  This driver can also be built as a module. If so, the module will
 	  be called tps53679.
 
+config SENSORS_TPS546D24
+	tristate "TPS546D24"
+	help
+	  If you say yes here you get hardware monitoring support for TEXAS
+	  TPS546D24.
+
+	  This driver can also be built as a module. If so, the module will
+	  be called tps546d24
+
 config SENSORS_UCD9000
 	tristate "TI UCD90120, UCD90124, UCD90160, UCD90320, UCD9090, UCD90910"
 	help
diff --git a/drivers/hwmon/pmbus/Makefile b/drivers/hwmon/pmbus/Makefile
index e2fe86f98965..0002dbe22d52 100644
--- a/drivers/hwmon/pmbus/Makefile
+++ b/drivers/hwmon/pmbus/Makefile
@@ -41,6 +41,7 @@ obj-$(CONFIG_SENSORS_Q54SJ108A2)	+= q54sj108a2.o
 obj-$(CONFIG_SENSORS_STPDDC60)	+= stpddc60.o
 obj-$(CONFIG_SENSORS_TPS40422)	+= tps40422.o
 obj-$(CONFIG_SENSORS_TPS53679)	+= tps53679.o
+obj-$(CONFIG_SENSORS_TPS546D24)	+= tps546d24.o
 obj-$(CONFIG_SENSORS_UCD9000)	+= ucd9000.o
 obj-$(CONFIG_SENSORS_UCD9200)	+= ucd9200.o
 obj-$(CONFIG_SENSORS_XDPE122)	+= xdpe12284.o
diff --git a/drivers/hwmon/pmbus/tps546d24.c b/drivers/hwmon/pmbus/tps546d24.c
new file mode 100644
index 000000000000..435f94304ad8
--- /dev/null
+++ b/drivers/hwmon/pmbus/tps546d24.c
@@ -0,0 +1,71 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Hardware monitoring driver for TEXAS TPS546D24 buck converter
+ */
+
+#include <linux/err.h>
+#include <linux/i2c.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/pmbus.h>
+#include "pmbus.h"
+
+static struct pmbus_driver_info tps546d24_info = {
+	.pages = 1,
+	.format[PSC_VOLTAGE_IN] = linear,
+	.format[PSC_VOLTAGE_OUT] = linear,
+	.format[PSC_TEMPERATURE] = linear,
+	.format[PSC_CURRENT_OUT] = linear,
+	.func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_IIN
+			| PMBUS_HAVE_IOUT | PMBUS_HAVE_VOUT
+			| PMBUS_HAVE_STATUS_IOUT | PMBUS_HAVE_STATUS_VOUT
+			| PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP,
+};
+
+static int tps546d24_probe(struct i2c_client *client)
+{
+	int reg;
+
+	reg = i2c_smbus_read_byte_data(client, PMBUS_VOUT_MODE);
+	if (reg < 0)
+		return reg;
+
+	if (reg & 0x80) {
+		int err;
+
+		err = i2c_smbus_write_byte_data(client, PMBUS_VOUT_MODE, reg & 0x7f);
+		if (err < 0)
+			return err;
+	}
+	return pmbus_do_probe(client, &tps546d24_info);
+}
+
+static const struct i2c_device_id tps546d24_id[] = {
+	{"tps546d24", 0},
+	{}
+};
+MODULE_DEVICE_TABLE(i2c, tps546d24_id);
+
+static const struct of_device_id __maybe_unused tps546d24_of_match[] = {
+	{.compatible = "ti,tps546d24"},
+	{}
+};
+MODULE_DEVICE_TABLE(of, tps546d24_of_match);
+
+/* This is the driver that will be inserted */
+static struct i2c_driver tps546d24_driver = {
+	.driver = {
+		   .name = "tps546d24",
+		   .of_match_table = of_match_ptr(tps546d24_of_match),
+	   },
+	.probe_new = tps546d24_probe,
+	.id_table = tps546d24_id,
+};
+
+module_i2c_driver(tps546d24_driver);
+
+MODULE_AUTHOR("Duke Du <dukedu83@gmail.com>");
+MODULE_DESCRIPTION("PMBus driver for TI tps546d24");
+MODULE_LICENSE("GPL");
+MODULE_IMPORT_NS(PMBUS);