iio: adc: mt6577_auxadc: Use devm_clk_get_enabled() helper function

The devm_clk_get_enabled() helper:
    - calls devm_clk_get()
    - calls clk_prepare_enable() and registers what is needed in order to
      call clk_disable_unprepare() when needed, as a managed resource.

This simplifies the code.

Signed-off-by: Jinjie Ruan <ruanjinjie@huawei.com>
Link: https://lore.kernel.org/r/20230825105746.2999548-3-ruanjinjie@huawei.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

diff --git a/drivers/iio/adc/mt6577_auxadc.c b/drivers/iio/adc/mt6577_auxadc.c
index 0e134777bdd2482d789a6975ed9ce6052343509d..ea42fd7a8c99ec0625fe709e95aa711bf14e67c7 100644 (file)
--- a/drivers/iio/adc/mt6577_auxadc.c
+++ b/drivers/iio/adc/mt6577_auxadc.c
@@ -270,23 +270,16 @@ static int mt6577_auxadc_probe(struct platform_device *pdev)
                return PTR_ERR(adc_dev->reg_base);
        }
 
-       adc_dev->adc_clk = devm_clk_get(&pdev->dev, "main");
+       adc_dev->adc_clk = devm_clk_get_enabled(&pdev->dev, "main");
        if (IS_ERR(adc_dev->adc_clk)) {
-               dev_err(&pdev->dev, "failed to get auxadc clock\n");
-               return PTR_ERR(adc_dev->adc_clk);
-       }
-
-       ret = clk_prepare_enable(adc_dev->adc_clk);
-       if (ret) {
                dev_err(&pdev->dev, "failed to enable auxadc clock\n");
-               return ret;
+               return PTR_ERR(adc_dev->adc_clk);
        }
 
        adc_clk_rate = clk_get_rate(adc_dev->adc_clk);
        if (!adc_clk_rate) {
-               ret = -EINVAL;
                dev_err(&pdev->dev, "null clock rate\n");
-               goto err_disable_clk;
+               return -EINVAL;
        }
 
        adc_dev->dev_comp = device_get_match_data(&pdev->dev);
@@ -310,8 +303,6 @@ static int mt6577_auxadc_probe(struct platform_device *pdev)
 err_power_off:
        mt6577_auxadc_mod_reg(adc_dev->reg_base + MT6577_AUXADC_MISC,
                              0, MT6577_AUXADC_PDN_EN);
-err_disable_clk:
-       clk_disable_unprepare(adc_dev->adc_clk);
        return ret;
 }
 
@@ -325,8 +316,6 @@ static int mt6577_auxadc_remove(struct platform_device *pdev)
        mt6577_auxadc_mod_reg(adc_dev->reg_base + MT6577_AUXADC_MISC,
                              0, MT6577_AUXADC_PDN_EN);
 
-       clk_disable_unprepare(adc_dev->adc_clk);
-
        return 0;
 }