leds: lp55xx: Use devm_clk_get_enabled() helpers

Simplify the code a bunch by using managed resource helpers.

Also, there is no need to save clk pointer anymore.

Suggested-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Signed-off-by: Huan Yang <link@vivo.com>
Link: https://lore.kernel.org/r/20240821013725.785956-1-link@vivo.com
Signed-off-by: Lee Jones <lee@kernel.org>

Author: Huan Yang

drivers/leds/leds-lp55xx-common.c

@@ -965,24 +965,16 @@ EXPORT_SYMBOL_GPL(lp55xx_update_bits);
 bool lp55xx_is_extclk_used(struct lp55xx_chip *chip)
 {
 	struct clk *clk;
-	int err;
 
-	clk = devm_clk_get(&chip->cl->dev, "32k_clk");
+	clk = devm_clk_get_enabled(&chip->cl->dev, "32k_clk");
 	if (IS_ERR(clk))
 		goto use_internal_clk;
 
-	err = clk_prepare_enable(clk);
-	if (err)
+	if (clk_get_rate(clk) != LP55XX_CLK_32K)
 		goto use_internal_clk;
 
-	if (clk_get_rate(clk) != LP55XX_CLK_32K) {
-		clk_disable_unprepare(clk);
-		goto use_internal_clk;
-	}
-
 	dev_info(&chip->cl->dev, "%dHz external clock used\n",	LP55XX_CLK_32K);
 
-	chip->clk = clk;
 	return true;
 
 use_internal_clk:
@@ -995,9 +987,6 @@ static void lp55xx_deinit_device(struct lp55xx_chip *chip)
 {
 	struct lp55xx_platform_data *pdata = chip->pdata;
 
-	if (chip->clk)
-		clk_disable_unprepare(chip->clk);
-
 	if (pdata->enable_gpiod)
 		gpiod_set_value(pdata->enable_gpiod, 0);
 }

drivers/leds/leds-lp55xx-common.h

@@ -193,7 +193,6 @@ struct lp55xx_engine {
  */
 struct lp55xx_chip {
 	struct i2c_client *cl;
-	struct clk *clk;
 	struct lp55xx_platform_data *pdata;
 	struct mutex lock;	/* lock for user-space interface */
 	int num_leds;