iio: magnetometer: st_magn: Add LSM303C

The magnetometer part of ST LSM303C is similar (perhaps even identical)
to the already supported standalone LIS3MDL magnetometer, so just
add the new st,lsm303c-magn compatible for the existing definitions.
Signed-off-by: Stephan Gerhold <stephan@gerhold.net>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Link: https://lore.kernel.org/r/20230106102239.9647-4-stephan@gerhold.netSigned-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

drivers/iio/magnetometer/Kconfig

@@ -119,7 +119,7 @@ config IIO_ST_MAGN_3AXIS
 	select IIO_TRIGGERED_BUFFER if (IIO_BUFFER)
 	help
 	  Say yes here to build support for STMicroelectronics magnetometers:
-	  LSM303DLHC, LSM303DLM, LIS3MDL.
+	  LSM303C, LSM303DLHC, LSM303DLM, LIS3MDL.
 
 	  Also need to enable at least one of I2C and SPI interface drivers
 	  below.

drivers/iio/magnetometer/st_magn.h

@@ -22,6 +22,7 @@
 #define LIS2MDL_MAGN_DEV_NAME		"lis2mdl"
 #define LSM9DS1_MAGN_DEV_NAME		"lsm9ds1_magn"
 #define IIS2MDC_MAGN_DEV_NAME		"iis2mdc"
+#define LSM303C_MAGN_DEV_NAME		"lsm303c_magn"
 
 #ifdef CONFIG_IIO_BUFFER
 int st_magn_allocate_ring(struct iio_dev *indio_dev);

drivers/iio/magnetometer/st_magn_core.c

@@ -305,6 +305,7 @@ static const struct st_sensor_settings st_magn_sensors_settings[] = {
 		.sensors_supported = {
 			[0] = LIS3MDL_MAGN_DEV_NAME,
 			[1] = LSM9DS1_MAGN_DEV_NAME,
+			[2] = LSM303C_MAGN_DEV_NAME,
 		},
 		.ch = (struct iio_chan_spec *)st_magn_2_16bit_channels,
 		.odr = {

drivers/iio/magnetometer/st_magn_i2c.c

@@ -50,6 +50,10 @@ static const struct of_device_id st_magn_of_match[] = {
 		.compatible = "st,iis2mdc",
 		.data = IIS2MDC_MAGN_DEV_NAME,
 	},
+	{
+		.compatible = "st,lsm303c-magn",
+		.data = LSM303C_MAGN_DEV_NAME,
+	},
 	{},
 };
 MODULE_DEVICE_TABLE(of, st_magn_of_match);
@@ -97,6 +101,7 @@ static const struct i2c_device_id st_magn_id_table[] = {
 	{ LIS2MDL_MAGN_DEV_NAME },
 	{ LSM9DS1_MAGN_DEV_NAME },
 	{ IIS2MDC_MAGN_DEV_NAME },
+	{ LSM303C_MAGN_DEV_NAME },
 	{},
 };
 MODULE_DEVICE_TABLE(i2c, st_magn_id_table);

drivers/iio/magnetometer/st_magn_spi.c

@@ -45,6 +45,10 @@ static const struct of_device_id st_magn_of_match[] = {
 		.compatible = "st,iis2mdc",
 		.data = IIS2MDC_MAGN_DEV_NAME,
 	},
+	{
+		.compatible = "st,lsm303c-magn",
+		.data = LSM303C_MAGN_DEV_NAME,
+	},
 	{}
 };
 MODULE_DEVICE_TABLE(of, st_magn_of_match);
@@ -89,6 +93,7 @@ static const struct spi_device_id st_magn_id_table[] = {
 	{ LIS2MDL_MAGN_DEV_NAME },
 	{ LSM9DS1_MAGN_DEV_NAME },
 	{ IIS2MDC_MAGN_DEV_NAME },
+	{ LSM303C_MAGN_DEV_NAME },
 	{},
 };
 MODULE_DEVICE_TABLE(spi, st_magn_id_table);