media: atomisp: ov2680: Rename unknown/0x370a to sensor_ctrl_0a

The data sheets say the registers at offset 0x3700 - 0x373f are
"sensor control" registers rename the unknown variable in
ov2680_set_mode() to sensor_ctrl_0a and add
a OV2680_REG_SENSOR_CTRL_0A define.

Link: https://lore.kernel.org/r/20230604161406.69369-5-hdegoede@redhat.comSigned-off-by: Hans de Goede <hdegoede@redhat.com>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>

drivers/staging/media/atomisp/i2c/atomisp-ov2680.c

@@ -248,22 +248,22 @@ static void ov2680_calc_mode(struct ov2680_dev *sensor)
 static int ov2680_set_mode(struct ov2680_dev *sensor)
 {
 	struct i2c_client *client = sensor->client;
-	u8 unknown, inc, fmt1, fmt2;
+	u8 sensor_ctrl_0a, inc, fmt1, fmt2;
 	int ret;
 
 	if (sensor->mode.binning) {
-		unknown = 0x23;
+		sensor_ctrl_0a = 0x23;
 		inc = 0x31;
 		fmt1 = 0xc2;
 		fmt2 = 0x01;
 	} else {
-		unknown = 0x21;
+		sensor_ctrl_0a = 0x21;
 		inc = 0x11;
 		fmt1 = 0xc0;
 		fmt2 = 0x00;
 	}
 
-	ret = ov_write_reg8(client, 0x370a, unknown);
+	ret = ov_write_reg8(client, OV2680_REG_SENSOR_CTRL_0A, sensor_ctrl_0a);
 	if (ret)
 		return ret;
 

drivers/staging/media/atomisp/i2c/ov2680.h

@@ -72,6 +72,8 @@
 #define OV2680_REG_EXPOSURE_PK_HIGH		0x3500
 #define OV2680_REG_GAIN_PK			0x350a
 
+#define OV2680_REG_SENSOR_CTRL_0A		0x370a
+
 #define OV2680_HORIZONTAL_START_H		0x3800 /* Bit[11:8] */
 #define OV2680_HORIZONTAL_START_L		0x3801 /* Bit[7:0]  */
 #define OV2680_VERTICAL_START_H			0x3802 /* Bit[11:8] */