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From:   Shreeya Patel <shreeya.patel@collabora.com>
To:     jic23@kernel.org, lars@metafoo.de, heiko@sntech.de,
        robh+dt@kernel.org, krzysztof.kozlowski+dt@linaro.org,
        sebastian.reichel@collabora.com
Cc:     linux-iio@vger.kernel.org, devicetree@vger.kernel.org,
        linux-arm-kernel@lists.infradead.org,
        linux-rockchip@lists.infradead.org, linux-kernel@vger.kernel.org,
        kernel@collabora.com, gustavo.padovan@collabora.com,
        serge.broslavsky@collabora.com,
        Shreeya Patel <shreeya.patel@collabora.com>
Subject: [PATCH v2 3/8] iio: adc: rockchip_saradc: Make use of devm_clk_get_enabled
Date:   Fri, 26 May 2023 02:57:07 +0530
Message-Id: <20230525212712.255406-4-shreeya.patel@collabora.com>
In-Reply-To: <20230525212712.255406-1-shreeya.patel@collabora.com>
References: <20230525212712.255406-1-shreeya.patel@collabora.com>
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Use devm_clk_get_enabled() to avoid manually disabling the
clock.

Signed-off-by: Shreeya Patel <shreeya.patel@collabora.com>
---

Changes in v2
  - No need to enable the clocks earlier than the original code.
    Move the enablement of clocks at it's original position.

 drivers/iio/adc/rockchip_saradc.c | 73 ++++---------------------------
 1 file changed, 9 insertions(+), 64 deletions(-)

diff --git a/drivers/iio/adc/rockchip_saradc.c b/drivers/iio/adc/rockchip_saradc.c
index 31637440be83..41226b76a995 100644
--- a/drivers/iio/adc/rockchip_saradc.c
+++ b/drivers/iio/adc/rockchip_saradc.c
@@ -345,20 +345,6 @@ static void rockchip_saradc_reset_controller(struct reset_control *reset)
 	reset_control_deassert(reset);
 }
 
-static void rockchip_saradc_clk_disable(void *data)
-{
-	struct rockchip_saradc *info = data;
-
-	clk_disable_unprepare(info->clk);
-}
-
-static void rockchip_saradc_pclk_disable(void *data)
-{
-	struct rockchip_saradc *info = data;
-
-	clk_disable_unprepare(info->pclk);
-}
-
 static void rockchip_saradc_regulator_disable(void *data)
 {
 	struct rockchip_saradc *info = data;
@@ -492,16 +478,6 @@ static int rockchip_saradc_probe(struct platform_device *pdev)
 		return ret;
 	}
 
-	info->pclk = devm_clk_get(&pdev->dev, "apb_pclk");
-	if (IS_ERR(info->pclk))
-		return dev_err_probe(&pdev->dev, PTR_ERR(info->pclk),
-				     "failed to get pclk\n");
-
-	info->clk = devm_clk_get(&pdev->dev, "saradc");
-	if (IS_ERR(info->clk))
-		return dev_err_probe(&pdev->dev, PTR_ERR(info->clk),
-				     "failed to get adc clock\n");
-
 	info->vref = devm_regulator_get(&pdev->dev, "vref");
 	if (IS_ERR(info->vref))
 		return dev_err_probe(&pdev->dev, PTR_ERR(info->vref),
@@ -539,31 +515,15 @@ static int rockchip_saradc_probe(struct platform_device *pdev)
 
 	info->uv_vref = ret;
 
-	ret = clk_prepare_enable(info->pclk);
-	if (ret < 0) {
-		dev_err(&pdev->dev, "failed to enable pclk\n");
-		return ret;
-	}
-	ret = devm_add_action_or_reset(&pdev->dev,
-				       rockchip_saradc_pclk_disable, info);
-	if (ret) {
-		dev_err(&pdev->dev, "failed to register devm action, %d\n",
-			ret);
-		return ret;
-	}
+	info->pclk = devm_clk_get_enabled(&pdev->dev, "apb_pclk");
+	if (IS_ERR(info->pclk))
+		return dev_err_probe(&pdev->dev, PTR_ERR(info->pclk),
+				     "failed to get pclk\n");
 
-	ret = clk_prepare_enable(info->clk);
-	if (ret < 0) {
-		dev_err(&pdev->dev, "failed to enable converter clock\n");
-		return ret;
-	}
-	ret = devm_add_action_or_reset(&pdev->dev,
-				       rockchip_saradc_clk_disable, info);
-	if (ret) {
-		dev_err(&pdev->dev, "failed to register devm action, %d\n",
-			ret);
-		return ret;
-	}
+	info->clk = devm_clk_get_enabled(&pdev->dev, "saradc");
+	if (IS_ERR(info->clk))
+		return dev_err_probe(&pdev->dev, PTR_ERR(info->clk),
+				     "failed to get adc clock\n");
 
 	platform_set_drvdata(pdev, indio_dev);
 
@@ -600,8 +560,6 @@ static int rockchip_saradc_suspend(struct device *dev)
 	struct iio_dev *indio_dev = dev_get_drvdata(dev);
 	struct rockchip_saradc *info = iio_priv(indio_dev);
 
-	clk_disable_unprepare(info->clk);
-	clk_disable_unprepare(info->pclk);
 	regulator_disable(info->vref);
 
 	return 0;
@@ -611,21 +569,8 @@ static int rockchip_saradc_resume(struct device *dev)
 {
 	struct iio_dev *indio_dev = dev_get_drvdata(dev);
 	struct rockchip_saradc *info = iio_priv(indio_dev);
-	int ret;
-
-	ret = regulator_enable(info->vref);
-	if (ret)
-		return ret;
-
-	ret = clk_prepare_enable(info->pclk);
-	if (ret)
-		return ret;
-
-	ret = clk_prepare_enable(info->clk);
-	if (ret)
-		clk_disable_unprepare(info->pclk);
 
-	return ret;
+	return regulator_enable(info->vref);
 }
 
 static DEFINE_SIMPLE_DEV_PM_OPS(rockchip_saradc_pm_ops,
-- 
2.30.2