iio:magnetometer: Add Support for ST IIS2MDC

Add support for ST magnetometer IIS2MDC,
an I2C/SPI interface 3-axis magnetometer.
The patch was tested on the instrument with IIS2MDC via I2C interface.
Signed-off-by: LI Qingwu <Qing-wu.Li@leica-geosystems.com.cn>
Link: https://lore.kernel.org/r/20210317063902.19300-3-Qing-wu.Li@leica-geosystems.com.cnSigned-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

drivers/iio/magnetometer/st_magn.h

@@ -21,6 +21,7 @@
 #define LSM303AGR_MAGN_DEV_NAME		"lsm303agr_magn"
 #define LIS2MDL_MAGN_DEV_NAME		"lis2mdl"
 #define LSM9DS1_MAGN_DEV_NAME		"lsm9ds1_magn"
+#define IIS2MDC_MAGN_DEV_NAME		"iis2mdc"
 
 const struct st_sensor_settings *st_magn_get_settings(const char *name);
 int st_magn_common_probe(struct iio_dev *indio_dev);

drivers/iio/magnetometer/st_magn_core.c

@@ -337,6 +337,7 @@ static const struct st_sensor_settings st_magn_sensors_settings[] = {
 		.sensors_supported = {
 			[0] = LSM303AGR_MAGN_DEV_NAME,
 			[1] = LIS2MDL_MAGN_DEV_NAME,
+			[2] = IIS2MDC_MAGN_DEV_NAME,
 		},
 		.ch = (struct iio_chan_spec *)st_magn_3_16bit_channels,
 		.odr = {

drivers/iio/magnetometer/st_magn_i2c.c

@@ -46,6 +46,10 @@ static const struct of_device_id st_magn_of_match[] = {
 		.compatible = "st,lsm9ds1-magn",
 		.data = LSM9DS1_MAGN_DEV_NAME,
 	},
+	{
+		.compatible = "st,iis2mdc",
+		.data = IIS2MDC_MAGN_DEV_NAME,
+	},
 	{},
 };
 MODULE_DEVICE_TABLE(of, st_magn_of_match);
@@ -101,6 +105,7 @@ static const struct i2c_device_id st_magn_id_table[] = {
 	{ LSM303AGR_MAGN_DEV_NAME },
 	{ LIS2MDL_MAGN_DEV_NAME },
 	{ LSM9DS1_MAGN_DEV_NAME },
+	{ IIS2MDC_MAGN_DEV_NAME },
 	{},
 };
 MODULE_DEVICE_TABLE(i2c, st_magn_id_table);

drivers/iio/magnetometer/st_magn_spi.c

@@ -41,6 +41,10 @@ static const struct of_device_id st_magn_of_match[] = {
 		.compatible = "st,lsm9ds1-magn",
 		.data = LSM9DS1_MAGN_DEV_NAME,
 	},
+	{
+		.compatible = "st,iis2mdc",
+		.data = IIS2MDC_MAGN_DEV_NAME,
+	},
 	{}
 };
 MODULE_DEVICE_TABLE(of, st_magn_of_match);
@@ -92,6 +96,7 @@ static const struct spi_device_id st_magn_id_table[] = {
 	{ LSM303AGR_MAGN_DEV_NAME },
 	{ LIS2MDL_MAGN_DEV_NAME },
 	{ LSM9DS1_MAGN_DEV_NAME },
+	{ IIS2MDC_MAGN_DEV_NAME },
 	{},
 };
 MODULE_DEVICE_TABLE(spi, st_magn_id_table);