iio: adc: ingenic-adc: Benefit from devm_clk_get_prepared() to simplify

Make use of devm_clk_get_prepared() to replace some code that effectively
open codes this new function.
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Link: https://lore.kernel.org/r/20220808204740.307667-4-u.kleine-koenig@pengutronix.deSigned-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

drivers/iio/adc/ingenic-adc.c

@@ -734,11 +734,6 @@ static int ingenic_adc_fwnode_xlate(struct iio_dev *iio_dev,
 	return -EINVAL;
 }
 
-static void ingenic_adc_clk_cleanup(void *data)
-{
-	clk_unprepare(data);
-}
-
 static const struct iio_info ingenic_adc_info = {
 	.write_raw = ingenic_adc_write_raw,
 	.read_raw = ingenic_adc_read_raw,
@@ -858,13 +853,13 @@ static int ingenic_adc_probe(struct platform_device *pdev)
 	if (IS_ERR(adc->base))
 		return PTR_ERR(adc->base);
 
-	adc->clk = devm_clk_get(dev, "adc");
+	adc->clk = devm_clk_get_prepared(dev, "adc");
 	if (IS_ERR(adc->clk)) {
 		dev_err(dev, "Unable to get clock\n");
 		return PTR_ERR(adc->clk);
 	}
 
-	ret = clk_prepare_enable(adc->clk);
+	ret = clk_enable(adc->clk);
 	if (ret) {
 		dev_err(dev, "Failed to enable clock\n");
 		return ret;
@@ -893,12 +888,6 @@ static int ingenic_adc_probe(struct platform_device *pdev)
 	usleep_range(2000, 3000); /* Must wait at least 2ms. */
 	clk_disable(adc->clk);
 
-	ret = devm_add_action_or_reset(dev, ingenic_adc_clk_cleanup, adc->clk);
-	if (ret) {
-		dev_err(dev, "Unable to add action\n");
-		return ret;
-	}
-
 	iio_dev->name = "jz-adc";
 	iio_dev->modes = INDIO_DIRECT_MODE | INDIO_BUFFER_SOFTWARE;
 	iio_dev->setup_ops = &ingenic_buffer_setup_ops;