[PATCH V2 3/3] hwmon: (ina2xx) Add support for INA234

[Ian Ray]

INA234 is register compatible to INA226 (excepting manufacturer and die
or device id registers) but has different scaling.

Signed-off-by: Ian Ray <ian.ray@xxxxxxxxxxxxxxxx>
---
 Documentation/hwmon/ina2xx.rst | 13 ++++++++++++-
 drivers/hwmon/Kconfig          |  2 +-
 drivers/hwmon/ina2xx.c         | 18 ++++++++++++++++++
 3 files changed, 31 insertions(+), 2 deletions(-)

diff --git a/Documentation/hwmon/ina2xx.rst b/Documentation/hwmon/ina2xx.rst
index a4ddf4bd2b08..d64e7af46a12 100644
--- a/Documentation/hwmon/ina2xx.rst
+++ b/Documentation/hwmon/ina2xx.rst
@@ -74,6 +74,16 @@ Supported chips:
 	       https://us1.silergy.com/
 
 
+  * Texas Instruments INA234
+
+    Prefix: 'ina234'
+
+    Addresses: I2C 0x40 - 0x43
+
+    Datasheet: Publicly available at the Texas Instruments website
+
+	       https://www.ti.com/
+
 Author: Lothar Felten <lothar.felten@xxxxxxxxx>
 
 Description
@@ -89,7 +99,7 @@ interface. The INA220 monitors both shunt drop and supply voltage.
 The INA226 is a current shunt and power monitor with an I2C interface.
 The INA226 monitors both a shunt voltage drop and bus supply voltage.
 
-INA230 and INA231 are high or low side current shunt and power monitors
+INA230, INA231, and INA234 are high or low side current shunt and power monitors
 with an I2C interface. The chips monitor both a shunt voltage drop and
 bus supply voltage.
 
@@ -132,6 +142,7 @@ Additional entries are available for the following chips:
   * ina226
   * ina230
   * ina231
+  * ina234
   * ina260
   * sy24655
 
diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig
index 41c381764c2b..6aa8a89f4747 100644
--- a/drivers/hwmon/Kconfig
+++ b/drivers/hwmon/Kconfig
@@ -2284,7 +2284,7 @@ config SENSORS_INA2XX
 	select REGMAP_I2C
 	help
 	  If you say yes here you get support for INA219, INA220, INA226,
-	  INA230, INA231, INA260, and SY24655 power monitor chips.
+	  INA230, INA231, INA234, INA260, and SY24655 power monitor chips.
 
 	  The INA2xx driver is configured for the default configuration of
 	  the part as described in the datasheet.
diff --git a/drivers/hwmon/ina2xx.c b/drivers/hwmon/ina2xx.c
index 4bf609e25f8a..d6032183b055 100644
--- a/drivers/hwmon/ina2xx.c
+++ b/drivers/hwmon/ina2xx.c
@@ -140,6 +140,7 @@ static const struct regmap_config ina2xx_regmap_config = {
 enum ina2xx_ids {
 	ina219,
 	ina226,
+	ina234,
 	ina260,
 	sy24655
 };
@@ -193,6 +194,18 @@ static const struct ina2xx_config ina2xx_config[] = {
 		.has_power_average = false,
 		.has_update_interval = true,
 	},
+	[ina234] = {
+		.config_default = INA226_CONFIG_DEFAULT,
+		.calibration_value = 2048,
+		.shunt_div = 400, /* 2.5 µV/LSB raw ADC reading from INA2XX_SHUNT_VOLTAGE */
+		.bus_voltage_shift = 4,
+		.bus_voltage_lsb = 25600,
+		.power_lsb_factor = 32,
+		.has_alerts = true,
+		.has_ishunt = false,
+		.has_power_average = false,
+		.has_update_interval = true,
+	},
 	[ina260] = {
 		.config_default = INA260_CONFIG_DEFAULT,
 		.shunt_div = 400,
@@ -995,6 +1008,7 @@ static const struct i2c_device_id ina2xx_id[] = {
 	{ "ina226", ina226 },
 	{ "ina230", ina226 },
 	{ "ina231", ina226 },
+	{ "ina234", ina234 },
 	{ "ina260", ina260 },
 	{ "sy24655", sy24655 },
 	{ }
@@ -1026,6 +1040,10 @@ static const struct of_device_id __maybe_unused ina2xx_of_match[] = {
 		.compatible = "ti,ina231",
 		.data = (void *)ina226
 	},
+	{
+		.compatible = "ti,ina234",
+		.data = (void *)ina234
+	},
 	{
 		.compatible = "ti,ina260",
 		.data = (void *)ina260
-- 
2.49.0