iio: imu: mpu6050: add support for 6515 variant

This patch adds support for the MPU 6515 variant. Confirmed that the
driver functions correctly on a LG Nexus 5 (hammerhead) phone.
Signed-off-by: Brian Masney <masneyb@onstation.org>
Signed-off-by: Jonathan Marek <jonathan@marek.ca>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

Documentation/devicetree/bindings/iio/imu/inv_mpu6050.txt

@@ -6,6 +6,7 @@ Required properties:
  - compatible : should be one of
 		"invensense,mpu6050"
  		"invensense,mpu6500"
+		"invensense,mpu6515"
 		"invensense,mpu9150"
 		"invensense,mpu9250"
 		"invensense,mpu9255"

drivers/iio/imu/inv_mpu6050/inv_mpu_core.c

@@ -103,6 +103,12 @@ static const struct inv_mpu6050_hw hw_info[] = {
 		.reg = &reg_set_6500,
 		.config = &chip_config_6050,
 	},
+	{
+		.whoami = INV_MPU6515_WHOAMI_VALUE,
+		.name = "MPU6515",
+		.reg = &reg_set_6500,
+		.config = &chip_config_6050,
+	},
 	{
 		.whoami = INV_MPU6000_WHOAMI_VALUE,
 		.name = "MPU6000",

drivers/iio/imu/inv_mpu6050/inv_mpu_i2c.c

@@ -174,6 +174,7 @@ static int inv_mpu_remove(struct i2c_client *client)
 static const struct i2c_device_id inv_mpu_id[] = {
 	{"mpu6050", INV_MPU6050},
 	{"mpu6500", INV_MPU6500},
+	{"mpu6515", INV_MPU6515},
 	{"mpu9150", INV_MPU9150},
 	{"mpu9250", INV_MPU9250},
 	{"mpu9255", INV_MPU9255},
@@ -192,6 +193,10 @@ static const struct of_device_id inv_of_match[] = {
 		.compatible = "invensense,mpu6500",
 		.data = (void *)INV_MPU6500
 	},
+	{
+		.compatible = "invensense,mpu6515",
+		.data = (void *)INV_MPU6515
+	},
 	{
 		.compatible = "invensense,mpu9150",
 		.data = (void *)INV_MPU9150

drivers/iio/imu/inv_mpu6050/inv_mpu_iio.h

@@ -71,6 +71,7 @@ struct inv_mpu6050_reg_map {
 enum inv_devices {
 	INV_MPU6050,
 	INV_MPU6500,
+	INV_MPU6515,
 	INV_MPU6000,
 	INV_MPU9150,
 	INV_MPU9250,
@@ -256,6 +257,7 @@ struct inv_mpu6050_state {
 #define INV_MPU9150_WHOAMI_VALUE		0x68
 #define INV_MPU9250_WHOAMI_VALUE		0x71
 #define INV_MPU9255_WHOAMI_VALUE		0x73
+#define INV_MPU6515_WHOAMI_VALUE		0x74
 #define INV_ICM20608_WHOAMI_VALUE		0xAF
 
 /* scan element definition */