linux-kernel - [PATCH v8 2/6] IIO: Ingenic JZ47xx: Error check clk

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Date:   Thu,  9 Jul 2020 17:21:56 +0200
From:   Artur Rojek <contact@...ur-rojek.eu>
To:     Dmitry Torokhov <dmitry.torokhov@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Jonathan Cameron <jic23@...nel.org>,
        Paul Cercueil <paul@...pouillou.net>,
        Andy Shevchenko <andy.shevchenko@...il.com>
Cc:     Heiko Stuebner <heiko@...ech.de>,
        Ezequiel Garcia <ezequiel@...guardiasur.com.ar>,
        devicetree@...r.kernel.org, linux-iio@...r.kernel.org,
        linux-kernel@...r.kernel.org, Artur Rojek <contact@...ur-rojek.eu>
Subject: [PATCH v8 2/6] IIO: Ingenic JZ47xx: Error check clk_enable calls.

Introduce error checks for the clk_enable calls used in this driver.
As part of the changes, move clk_enable/clk_disable calls out of
ingenic_adc_set_config and into respective logic of its callers.

Signed-off-by: Artur Rojek <contact@...ur-rojek.eu>
Tested-by: Paul Cercueil <paul@...pouillou.net>
---

 Changes:

 v6: new patch

 v7: no change

 v8: move `clk_disable` outside the lock

 drivers/iio/adc/ingenic-adc.c | 25 +++++++++++++++++++++----
 1 file changed, 21 insertions(+), 4 deletions(-)

diff --git a/drivers/iio/adc/ingenic-adc.c b/drivers/iio/adc/ingenic-adc.c
index 39c0a609fc94..c1946a9f1cca 100644
--- a/drivers/iio/adc/ingenic-adc.c
+++ b/drivers/iio/adc/ingenic-adc.c
@@ -73,7 +73,6 @@ static void ingenic_adc_set_config(struct ingenic_adc *adc,
 {
 	uint32_t cfg;
 
-	clk_enable(adc->clk);
 	mutex_lock(&adc->lock);
 
 	cfg = readl(adc->base + JZ_ADC_REG_CFG) & ~mask;
@@ -81,7 +80,6 @@ static void ingenic_adc_set_config(struct ingenic_adc *adc,
 	writel(cfg, adc->base + JZ_ADC_REG_CFG);
 
 	mutex_unlock(&adc->lock);
-	clk_disable(adc->clk);
 }
 
 static void ingenic_adc_enable(struct ingenic_adc *adc,
@@ -124,6 +122,8 @@ static int ingenic_adc_write_raw(struct iio_dev *iio_dev,
 				 long m)
 {
 	struct ingenic_adc *adc = iio_priv(iio_dev);
+	struct device *dev = iio_dev->dev.parent;
+	int ret;
 
 	switch (m) {
 	case IIO_CHAN_INFO_SCALE:
@@ -131,6 +131,14 @@ static int ingenic_adc_write_raw(struct iio_dev *iio_dev,
 		case INGENIC_ADC_BATTERY:
 			if (!adc->soc_data->battery_vref_mode)
 				return -EINVAL;
+
+			ret = clk_enable(adc->clk);
+			if (ret) {
+				dev_err(dev, "Failed to enable clock: %d\n",
+					ret);
+				return ret;
+			}
+
 			if (val > JZ_ADC_BATTERY_LOW_VREF) {
 				ingenic_adc_set_config(adc,
 						       JZ_ADC_REG_CFG_BAT_MD,
@@ -142,6 +150,9 @@ static int ingenic_adc_write_raw(struct iio_dev *iio_dev,
 						       JZ_ADC_REG_CFG_BAT_MD);
 				adc->low_vref_mode = true;
 			}
+
+			clk_disable(adc->clk);
+
 			return 0;
 		default:
 			return -EINVAL;
@@ -317,6 +328,13 @@ static int ingenic_adc_read_chan_info_raw(struct ingenic_adc *adc,
 					  int *val)
 {
 	int bit, ret, engine = (chan->channel == INGENIC_ADC_BATTERY);
+	struct device *dev = iio_priv_to_dev(adc)->dev.parent;
+
+	ret = clk_enable(adc->clk);
+	if (ret) {
+		dev_err(dev, "Failed to enable clock: %d\n", ret);
+		return ret;
+	}
 
 	/* We cannot sample AUX/AUX2 in parallel. */
 	mutex_lock(&adc->aux_lock);
@@ -325,7 +343,6 @@ static int ingenic_adc_read_chan_info_raw(struct ingenic_adc *adc,
 		ingenic_adc_set_config(adc, JZ_ADC_REG_CFG_AUX_MD, bit);
 	}
 
-	clk_enable(adc->clk);
 	ret = ingenic_adc_capture(adc, engine);
 	if (ret)
 		goto out;
@@ -342,8 +359,8 @@ static int ingenic_adc_read_chan_info_raw(struct ingenic_adc *adc,
 
 	ret = IIO_VAL_INT;
 out:
-	clk_disable(adc->clk);
 	mutex_unlock(&adc->aux_lock);
+	clk_disable(adc->clk);
 
 	return ret;
 }
-- 
2.27.0