[PATCH -next 3/4] iio: adc: spear_adc: Use devm_clk_get_enabled() helper function

[Jinjie Ruan]

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 at huawei.com>
---
 drivers/iio/adc/spear_adc.c | 30 +++++++-----------------------
 1 file changed, 7 insertions(+), 23 deletions(-)

diff --git a/drivers/iio/adc/spear_adc.c b/drivers/iio/adc/spear_adc.c
index ad54ef798109..cd7708aa95af 100644
--- a/drivers/iio/adc/spear_adc.c
+++ b/drivers/iio/adc/spear_adc.c
@@ -297,36 +297,27 @@ static int spear_adc_probe(struct platform_device *pdev)
 	st->adc_base_spear3xx =
 		(struct adc_regs_spear3xx __iomem *)st->adc_base_spear6xx;
 
-	st->clk = devm_clk_get(dev, NULL);
+	st->clk = devm_clk_get_enabled(dev, NULL);
 	if (IS_ERR(st->clk)) {
-		dev_err(dev, "failed getting clock\n");
-		return PTR_ERR(st->clk);
-	}
-
-	ret = clk_prepare_enable(st->clk);
-	if (ret) {
 		dev_err(dev, "failed enabling clock\n");
-		return ret;
+		return PTR_ERR(st->clk);
 	}
 
 	irq = platform_get_irq(pdev, 0);
-	if (irq < 0) {
-		ret = irq;
-		goto errout2;
-	}
+	if (irq < 0)
+		return irq;
 
 	ret = devm_request_irq(dev, irq, spear_adc_isr, 0, SPEAR_ADC_MOD_NAME,
 			       st);
 	if (ret < 0) {
 		dev_err(dev, "failed requesting interrupt\n");
-		goto errout2;
+		return ret;
 	}
 
 	if (of_property_read_u32(np, "sampling-frequency",
 				 &st->sampling_freq)) {
 		dev_err(dev, "sampling-frequency missing in DT\n");
-		ret = -EINVAL;
-		goto errout2;
+		return -EINVAL;
 	}
 
 	/*
@@ -355,24 +346,17 @@ static int spear_adc_probe(struct platform_device *pdev)
 
 	ret = iio_device_register(indio_dev);
 	if (ret)
-		goto errout2;
+		return ret;
 
 	dev_info(dev, "SPEAR ADC driver loaded, IRQ %d\n", irq);
 
 	return 0;
-
-errout2:
-	clk_disable_unprepare(st->clk);
-	return ret;
 }
 
 static int spear_adc_remove(struct platform_device *pdev)
 {
 	struct iio_dev *indio_dev = platform_get_drvdata(pdev);
-	struct spear_adc_state *st = iio_priv(indio_dev);
-
 	iio_device_unregister(indio_dev);
-	clk_disable_unprepare(st->clk);
 
 	return 0;
 }
-- 
2.34.1