hwmon: (ina238) Add support for INA700

INA700 is register compatible to INA780 but has different current, power,
and energy LSB values.

While the chip does not directly report the shunt voltage, report
it anyway by calculating its value from the current register.

Reviewed-by: Chris Packham <chris.packham@alliedtelesis.co.nz>
Tested-by: Chris Packham <chris.packham@alliedtelesis.co.nz> # INA780
Cc: Christian Kahr <christian.kahr@sie.at>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>

Documentation/hwmon/ina238.rst

@@ -32,6 +32,11 @@ Supported chips:
     Datasheet:
 	https://www.ti.com/lit/gpn/ina238
 
+  * Texas Instruments INA700
+
+    Datasheet:
+	https://www.ti.com/product/ina700
+
   * Texas Instruments INA780
 
     Datasheet:
@@ -61,8 +66,8 @@ INA237 is a functionally equivalent variant of INA238 with slightly
 different accuracy. INA228 is another variant of INA238 with higher ADC
 resolution. This chip also reports the energy.
 
-INA780 is a variant of the chip series with built-in shunt resistor.
+INA700 and INA780 are variants of the chip series with built-in shunt resistor.
-It also reports the energy.
+They also report the energy.
 
 SQ52206 is a mostly compatible chip from Sylergy. It reports the energy
 as well as the peak power consumption.

drivers/hwmon/Kconfig

@@ -2257,9 +2257,9 @@ config SENSORS_INA238
 	select REGMAP_I2C
 	help
 	  If you say yes here you get support for INA228, INA237, INA238,
-	  INA780, and SQ52206 power monitor chips. This driver supports voltage,
+	  INA700, INA780, and SQ52206 power monitor chips. This driver supports
-	  current, power, energy, and temperature measurements as well as alarm
+	  voltage, current, power, energy, and temperature measurements as well
-	  configuration.
+	  as alarm configuration.
 
 	  This driver can also be built as a module. If so, the module
 	  will be called ina238.

drivers/hwmon/ina238.c

@@ -101,7 +101,7 @@ static const struct regmap_config ina238_regmap_config = {
 	.val_bits = 16,
 };
 
-enum ina238_ids { ina228, ina237, ina238, ina780, sq52206 };
+enum ina238_ids { ina228, ina237, ina238, ina700, ina780, sq52206 };
 
 struct ina238_config {
 	bool has_20bit_voltage_current; /* vshunt, vbus and current are 20-bit fields */
@@ -155,6 +155,16 @@ static const struct ina238_config ina238_config[] = {
 		.bus_voltage_lsb = INA238_BUS_VOLTAGE_LSB,
 		.temp_resolution = 12,
 	},
+	[ina700] = {
+		.has_20bit_voltage_current = false,
+		.has_energy = true,
+		.has_power_highest = false,
+		.power_calculate_factor = 20,
+		.config_default = INA238_CONFIG_DEFAULT,
+		.bus_voltage_lsb = INA238_BUS_VOLTAGE_LSB,
+		.temp_resolution = 12,
+		.current_lsb = 480,
+	},
 	[ina780] = {
 		.has_20bit_voltage_current = false,
 		.has_energy = true,
@@ -846,6 +856,7 @@ static const struct i2c_device_id ina238_id[] = {
 	{ "ina228", ina228 },
 	{ "ina237", ina237 },
 	{ "ina238", ina238 },
+	{ "ina700", ina700 },
 	{ "ina780", ina780 },
 	{ "sq52206", sq52206 },
 	{ }
@@ -865,6 +876,10 @@ static const struct of_device_id __maybe_unused ina238_of_match[] = {
 		.compatible = "ti,ina238",
 		.data = (void *)ina238
 	},
+	{
+		.compatible = "ti,ina700",
+		.data = (void *)ina700
+	},
 	{
 		.compatible = "ti,ina780",
 		.data = (void *)ina780