drivers: media: imx708: Tidy-ups to addres upstream review comments

This commit addresses vaious tidy-ups requesed for upstreaming the
IMX708 driver. Notably:

- Remove #define IMX708_NUM_SUPPLIES and use ARRAY_SIZE() directly
- Use dev_err_probe where possible in imx708_probe()
- Fix error handling paths in imx708_probe()

Signed-off-by: Naushir Patuck <naush@raspberrypi.com>

drivers/media/i2c/imx708.c

@@ -792,8 +792,6 @@ static const char * const imx708_supply_name[] = {
 	"VDDL",  /* IF (1.8V) supply */
 };
 
-#define IMX708_NUM_SUPPLIES ARRAY_SIZE(imx708_supply_name)
-
 /*
  * Initialisation delay between XCLR low->high and the moment when the sensor
  * can start capture (i.e. can leave software standby), given by T7 in the
@@ -815,7 +813,7 @@ struct imx708 {
 	u32 xclk_freq;
 
 	struct gpio_desc *reset_gpio;
-	struct regulator_bulk_data supplies[IMX708_NUM_SUPPLIES];
+	struct regulator_bulk_data supplies[ARRAY_SIZE(imx708_supply_name)];
 
 	struct v4l2_ctrl_handler ctrl_handler;
 	/* V4L2 Controls */
@@ -935,9 +933,10 @@ static int imx708_write_regs(struct imx708 *imx708,
 {
 	struct i2c_client *client = v4l2_get_subdevdata(&imx708->sd);
 	unsigned int i;
-	int ret;
 
 	for (i = 0; i < len; i++) {
+		int ret;
+
 		ret = imx708_write_reg(imx708, regs[i].address, 1, regs[i].val);
 		if (ret) {
 			dev_err_ratelimited(&client->dev,
@@ -1025,20 +1024,16 @@ static int imx708_open(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh)
 
 static int imx708_set_exposure(struct imx708 *imx708, unsigned int val)
 {
-	int ret;
-
 	val = max(val, imx708->mode->exposure_lines_min);
 	val -= val % imx708->mode->exposure_lines_step;
 
 	/*
 	 * In HDR mode this will set the longest exposure. The sensor
 	 * will automatically divide the medium and short ones by 4,16.
 	 */
-	ret = imx708_write_reg(imx708, IMX708_REG_EXPOSURE,
-			       IMX708_REG_VALUE_16BIT,
-			       val >> imx708->long_exp_shift);
-
-	return ret;
+	return imx708_write_reg(imx708, IMX708_REG_EXPOSURE,
+				IMX708_REG_VALUE_16BIT,
+				val >> imx708->long_exp_shift);
 }
 
 static void imx708_adjust_exposure_range(struct imx708 *imx708,
@@ -1071,7 +1066,7 @@ static int imx708_set_analogue_gain(struct imx708 *imx708, unsigned int val)
 
 static int imx708_set_frame_length(struct imx708 *imx708, unsigned int val)
 {
-	int ret = 0;
+	int ret;
 
 	imx708->long_exp_shift = 0;
 
@@ -1091,8 +1086,8 @@ static int imx708_set_frame_length(struct imx708 *imx708, unsigned int val)
 
 static void imx708_set_framing_limits(struct imx708 *imx708)
 {
-	unsigned int hblank;
 	const struct imx708_mode *mode = imx708->mode;
+	unsigned int hblank;
 
 	__v4l2_ctrl_modify_range(imx708->pixel_rate,
 				 mode->pixel_rate, mode->pixel_rate,
@@ -1599,7 +1594,7 @@ static int imx708_power_on(struct device *dev)
 	struct imx708 *imx708 = to_imx708(sd);
 	int ret;
 
-	ret = regulator_bulk_enable(IMX708_NUM_SUPPLIES,
+	ret = regulator_bulk_enable(ARRAY_SIZE(imx708_supply_name),
 				    imx708->supplies);
 	if (ret) {
 		dev_err(&client->dev, "%s: failed to enable regulators\n",
@@ -1621,7 +1616,8 @@ static int imx708_power_on(struct device *dev)
 	return 0;
 
 reg_off:
-	regulator_bulk_disable(IMX708_NUM_SUPPLIES, imx708->supplies);
+	regulator_bulk_disable(ARRAY_SIZE(imx708_supply_name),
+			       imx708->supplies);
 	return ret;
 }
 
@@ -1632,7 +1628,8 @@ static int imx708_power_off(struct device *dev)
 	struct imx708 *imx708 = to_imx708(sd);
 
 	gpiod_set_value_cansleep(imx708->reset_gpio, 0);
-	regulator_bulk_disable(IMX708_NUM_SUPPLIES, imx708->supplies);
+	regulator_bulk_disable(ARRAY_SIZE(imx708_supply_name),
+			       imx708->supplies);
 	clk_disable_unprepare(imx708->xclk);
 
 	/* Force reprogramming of the common registers when powered up again. */
@@ -1679,11 +1676,11 @@ static int imx708_get_regulators(struct imx708 *imx708)
 	struct i2c_client *client = v4l2_get_subdevdata(&imx708->sd);
 	unsigned int i;
 
-	for (i = 0; i < IMX708_NUM_SUPPLIES; i++)
+	for (i = 0; i < ARRAY_SIZE(imx708_supply_name); i++)
 		imx708->supplies[i].supply = imx708_supply_name[i];
 
 	return devm_regulator_bulk_get(&client->dev,
-				       IMX708_NUM_SUPPLIES,
+				       ARRAY_SIZE(imx708_supply_name),
 				       imx708->supplies);
 }
 
@@ -1956,23 +1953,19 @@ static int imx708_probe(struct i2c_client *client)
 
 	/* Get system clock (xclk) */
 	imx708->xclk = devm_clk_get(dev, NULL);
-	if (IS_ERR(imx708->xclk)) {
-		dev_err(dev, "failed to get xclk\n");
-		return PTR_ERR(imx708->xclk);
-	}
+	if (IS_ERR(imx708->xclk))
+		return dev_err_probe(dev, PTR_ERR(imx708->xclk),
+				     "failed to get xclk\n");
 
 	imx708->xclk_freq = clk_get_rate(imx708->xclk);
-	if (imx708->xclk_freq != IMX708_XCLK_FREQ) {
-		dev_err(dev, "xclk frequency not supported: %d Hz\n",
-			imx708->xclk_freq);
-		return -EINVAL;
-	}
+	if (imx708->xclk_freq != IMX708_XCLK_FREQ)
+		return dev_err_probe(dev, -EINVAL,
+				     "xclk frequency not supported: %d Hz\n",
+				     imx708->xclk_freq);
 
 	ret = imx708_get_regulators(imx708);
-	if (ret) {
-		dev_err(dev, "failed to get regulators\n");
-		return ret;
-	}
+	if (ret)
+		return dev_err_probe(dev, ret, "failed to get regulators\n");
 
 	/* Request optional enable pin */
 	imx708->reset_gpio = devm_gpiod_get_optional(dev, "reset",
@@ -2001,7 +1994,7 @@ static int imx708_probe(struct i2c_client *client)
 	/* This needs the pm runtime to be registered. */
 	ret = imx708_init_controls(imx708);
 	if (ret)
-		goto error_power_off;
+		goto error_pm_runtime;
 
 	/* Initialize subdev */
 	imx708->sd.internal_ops = &imx708_internal_ops;
@@ -2033,9 +2026,11 @@ static int imx708_probe(struct i2c_client *client)
 error_handler_free:
 	imx708_free_controls(imx708);
 
-error_power_off:
+error_pm_runtime:
 	pm_runtime_disable(&client->dev);
 	pm_runtime_set_suspended(&client->dev);
+
+error_power_off:
 	imx708_power_off(&client->dev);
 
 	return ret;