media: i2c: et8ek8: Drop support for per-mode external clock frequency

The et8ek8 driver supports programming different external clock
frequencies for different modes, but in practice all modes use a 9.6MHz
external clock. Drop support for this feature and use a hardcoded
frequency, in preparation for further refactoring of external clock
handling.

Signed-off-by: Laurent Pinchart <[e-mail]>
Signed-off-by: Sakari Ailus <[e-mail]>
Reviewed-by: Mehdi Djait <[e-mail]>
Signed-off-by: Hans Verkuil <[e-mail]>

drivers/media/i2c/et8ek8/et8ek8_driver.c

···
 {
 	struct v4l2_subdev *subdev = &sensor->subdev;
 	struct i2c_client *client = v4l2_get_subdevdata(subdev);
-	unsigned int xclk_freq;
+	unsigned int xclk_freq = 9600000;
 	int val, rval;
 
 	rval = regulator_enable(sensor->vana);
···
 		dev_err(&client->dev, "failed to enable vana regulator\n");
 		return rval;
 	}
-
-	if (sensor->current_reglist)
-		xclk_freq = sensor->current_reglist->mode.ext_clock;
-	else
-		xclk_freq = sensor->xclk_freq;
 
 	rval = clk_set_rate(sensor->ext_clk, xclk_freq);
 	if (rval < 0) {
···
 						&fi->interval);
 
 	if (!reglist)
-		return -EINVAL;
-
-	if (sensor->current_reglist->mode.ext_clock != reglist->mode.ext_clock)
 		return -EINVAL;
 
 	sensor->current_reglist = reglist;

drivers/media/i2c/et8ek8/et8ek8_mode.c

···
 		.window_width = 2592,
 		.window_height = 1968,
 		.pixel_clock = 80000000,
-		.ext_clock = 9600000,
 		.timeperframe = {
 			.numerator = 100,
 			.denominator = 1207
···
 		.window_width = 2592,
 		.window_height = 1968,
 		.pixel_clock = 80000000,
-		.ext_clock = 9600000,
 		.timeperframe = {
 			.numerator = 100,
 			.denominator = 1292
···
 		.window_width = 1296,
 		.window_height = 984,
 		.pixel_clock = 96533333,
-		.ext_clock = 9600000,
 		.timeperframe = {
 			.numerator = 100,
 			.denominator = 3000
···
 		.window_width = 864,
 		.window_height = 656,
 		.pixel_clock = 80000000,
-		.ext_clock = 9600000,
 		.timeperframe = {
 			.numerator = 100,
 			.denominator = 2988
···
 		.window_width = 648,
 		.window_height = 492,
 		.pixel_clock = 80000000,
-		.ext_clock = 9600000,
 		.timeperframe = {
 			.numerator = 100,
 			.denominator = 2993
···
 		.window_width = 2592,
 		.window_height = 1968,
 		.pixel_clock = 80000000,
-		.ext_clock = 9600000,
 		.timeperframe = {
 			.numerator = 100,
 			.denominator = 399
···
 		.window_width = 648,
 		.window_height = 492,
 		.pixel_clock = 13333333,
-		.ext_clock = 9600000,
 		.timeperframe = {
 			.numerator = 100,
 			.denominator = 499
···
 		.window_width = 1296,
 		.window_height = 984,
 		.pixel_clock = 49400000,
-		.ext_clock = 9600000,
 		.timeperframe = {
 			.numerator = 100,
 			.denominator = 501
···
 		.window_width = 1296,
 		.window_height = 984,
 		.pixel_clock = 84266667,
-		.ext_clock = 9600000,
 		.timeperframe = {
 			.numerator = 100,
 			.denominator = 2500

drivers/media/i2c/et8ek8/et8ek8_reg.h

···
 	u16 window_height;
 
 	u32 pixel_clock;		/* in Hz */
-	u32 ext_clock;			/* in Hz */
 	struct v4l2_fract timeperframe;
 	u32 max_exp;			/* Maximum exposure value */
 	u32 bus_format;			/* MEDIA_BUS_FMT_ */