iio: st-sensors: add support for lis3lv02d accelerometer

This adds support for the LIS3LV02 accelerometer found in the
ST Microelectronics Nomadik board series.

Cc: devicetree@vger.kernel.org
Cc: Denis CIOCCA <denis.ciocca@st.com>
Acked-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>

Documentation/devicetree/bindings/iio/st-sensors.txt

@@ -23,6 +23,7 @@ standard bindings from pinctrl/pinctrl-bindings.txt.
 Valid compatible strings:
 
 Accelerometers:
+- st,lis3lv02dl-accel
 - st,lsm303dlh-accel
 - st,lsm303dlhc-accel
 - st,lis3dh-accel

drivers/iio/accel/st_accel.h

@@ -14,6 +14,7 @@
 #include <linux/types.h>
 #include <linux/iio/common/st_sensors.h>
 
+#define LIS3LV02DL_ACCEL_DEV_NAME	"lis3lv02dl_accel"
 #define LSM303DLHC_ACCEL_DEV_NAME	"lsm303dlhc_accel"
 #define LIS3DH_ACCEL_DEV_NAME		"lis3dh"
 #define LSM330D_ACCEL_DEV_NAME		"lsm330d_accel"

drivers/iio/accel/st_accel_core.c

@@ -129,6 +129,30 @@
 #define ST_ACCEL_3_IG1_EN_MASK			0x08
 #define ST_ACCEL_3_MULTIREAD_BIT		false
 
+/* CUSTOM VALUES FOR SENSOR 4 */
+#define ST_ACCEL_4_WAI_EXP			0x3a
+#define ST_ACCEL_4_ODR_ADDR			0x20
+#define ST_ACCEL_4_ODR_MASK			0x30 /* DF1 and DF0 */
+#define ST_ACCEL_4_ODR_AVL_40HZ_VAL		0x00
+#define ST_ACCEL_4_ODR_AVL_160HZ_VAL		0x01
+#define ST_ACCEL_4_ODR_AVL_640HZ_VAL		0x02
+#define ST_ACCEL_4_ODR_AVL_2560HZ_VAL		0x03
+#define ST_ACCEL_4_PW_ADDR			0x20
+#define ST_ACCEL_4_PW_MASK			0xc0
+#define ST_ACCEL_4_FS_ADDR			0x21
+#define ST_ACCEL_4_FS_MASK			0x80
+#define ST_ACCEL_4_FS_AVL_2_VAL			0X00
+#define ST_ACCEL_4_FS_AVL_6_VAL			0X01
+#define ST_ACCEL_4_FS_AVL_2_GAIN		IIO_G_TO_M_S_2(1024)
+#define ST_ACCEL_4_FS_AVL_6_GAIN		IIO_G_TO_M_S_2(340)
+#define ST_ACCEL_4_BDU_ADDR			0x21
+#define ST_ACCEL_4_BDU_MASK			0x40
+#define ST_ACCEL_4_DRDY_IRQ_ADDR		0x21
+#define ST_ACCEL_4_DRDY_IRQ_INT1_MASK		0x04
+#define ST_ACCEL_4_IG1_EN_ADDR			0x21
+#define ST_ACCEL_4_IG1_EN_MASK			0x08
+#define ST_ACCEL_4_MULTIREAD_BIT		true
+
 static const struct iio_chan_spec st_accel_12bit_channels[] = {
 	ST_SENSORS_LSM_CHANNELS(IIO_ACCEL,
 			BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_SCALE),
@@ -373,6 +397,63 @@ static const struct st_sensor_settings st_accel_sensors_settings[] = {
 		.multi_read_bit = ST_ACCEL_3_MULTIREAD_BIT,
 		.bootime = 2,
 	},
+	{
+		.wai = ST_ACCEL_4_WAI_EXP,
+		.sensors_supported = {
+			[0] = LIS3LV02DL_ACCEL_DEV_NAME,
+		},
+		.ch = (struct iio_chan_spec *)st_accel_12bit_channels,
+		.odr = {
+			.addr = ST_ACCEL_4_ODR_ADDR,
+			.mask = ST_ACCEL_4_ODR_MASK,
+			.odr_avl = {
+				{ 40, ST_ACCEL_4_ODR_AVL_40HZ_VAL },
+				{ 160, ST_ACCEL_4_ODR_AVL_160HZ_VAL, },
+				{ 640, ST_ACCEL_4_ODR_AVL_640HZ_VAL, },
+				{ 2560, ST_ACCEL_4_ODR_AVL_2560HZ_VAL, },
+			},
+		},
+		.pw = {
+			.addr = ST_ACCEL_4_PW_ADDR,
+			.mask = ST_ACCEL_4_PW_MASK,
+			.value_on = ST_SENSORS_DEFAULT_POWER_ON_VALUE,
+			.value_off = ST_SENSORS_DEFAULT_POWER_OFF_VALUE,
+		},
+		.enable_axis = {
+			.addr = ST_SENSORS_DEFAULT_AXIS_ADDR,
+			.mask = ST_SENSORS_DEFAULT_AXIS_MASK,
+		},
+		.fs = {
+			.addr = ST_ACCEL_4_FS_ADDR,
+			.mask = ST_ACCEL_4_FS_MASK,
+			.fs_avl = {
+				[0] = {
+					.num = ST_ACCEL_FS_AVL_2G,
+					.value = ST_ACCEL_4_FS_AVL_2_VAL,
+					.gain = ST_ACCEL_4_FS_AVL_2_GAIN,
+				},
+				[1] = {
+					.num = ST_ACCEL_FS_AVL_6G,
+					.value = ST_ACCEL_4_FS_AVL_6_VAL,
+					.gain = ST_ACCEL_4_FS_AVL_6_GAIN,
+				},
+			},
+		},
+		.bdu = {
+			.addr = ST_ACCEL_4_BDU_ADDR,
+			.mask = ST_ACCEL_4_BDU_MASK,
+		},
+		.drdy_irq = {
+			.addr = ST_ACCEL_4_DRDY_IRQ_ADDR,
+			.mask_int1 = ST_ACCEL_4_DRDY_IRQ_INT1_MASK,
+			.ig1 = {
+				.en_addr = ST_ACCEL_4_IG1_EN_ADDR,
+				.en_mask = ST_ACCEL_4_IG1_EN_MASK,
+			},
+		},
+		.multi_read_bit = ST_ACCEL_4_MULTIREAD_BIT,
+		.bootime = 2, /* guess */
+	},
 };
 
 static int st_accel_read_raw(struct iio_dev *indio_dev,

drivers/iio/accel/st_accel_i2c.c

@@ -20,6 +20,10 @@
 
 #ifdef CONFIG_OF
 static const struct of_device_id st_accel_of_match[] = {
+	{
+		.compatible = "st,lis3lv02dl-accel",
+		.data = LIS3LV02DL_ACCEL_DEV_NAME,
+	},
 	{
 		.compatible = "st,lsm303dlh-accel",
 		.data = LSM303DLH_ACCEL_DEV_NAME,