media: ov5647: Rename SBGGR8 VGA mode

Before adding new modes, rename the only existing one to report
the bit depth to distinguish it from future additions.

While at it, briefly describe the mode.
Signed-off-by: Jacopo Mondi <jacopo@jmondi.org>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>

drivers/media/i2c/ov5647.c

@@ -115,7 +115,7 @@ static struct regval_list sensor_oe_enable_regs[] = {
 	{0x3002, 0xe4},
 };
 
-static const struct regval_list ov5647_640x480[] = {
+static const struct regval_list ov5647_640x480_8bpp[] = {
 	{0x0100, 0x00},
 	{0x0103, 0x01},
 	{0x3034, 0x08},
@@ -205,7 +205,8 @@ static const struct regval_list ov5647_640x480[] = {
 	{0x0100, 0x01},
 };
 
-static const struct ov5647_mode ov5647_8bit_modes[] = {
+static const struct ov5647_mode ov5647_8bpp_modes[] = {
+	/* 8-bit VGA mode: Uncentred crop 2x2 binned 1296x972 image. */
 	{
 		.format	= {
 			.code		= MEDIA_BUS_FMT_SBGGR8_1X8,
@@ -220,16 +221,16 @@ static const struct ov5647_mode ov5647_8bit_modes[] = {
 			.width		= 1280,
 			.height		= 960,
 		},
-		.reg_list	= ov5647_640x480,
-		.num_regs	= ARRAY_SIZE(ov5647_640x480)
+		.reg_list	= ov5647_640x480_8bpp,
+		.num_regs	= ARRAY_SIZE(ov5647_640x480_8bpp)
 	},
 };
 
 static const struct ov5647_format_list ov5647_formats[] = {
 	{
 		.mbus_code	= MEDIA_BUS_FMT_SBGGR8_1X8,
-		.modes		= ov5647_8bit_modes,
-		.num_modes	= ARRAY_SIZE(ov5647_8bit_modes),
+		.modes		= ov5647_8bpp_modes,
+		.num_modes	= ARRAY_SIZE(ov5647_8bpp_modes),
 	},
 };