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Message-Id: <202108250006.17P06jKH097337@twspam01.aspeedtech.com>
From:   Billy Tsai <billy_tsai@aspeedtech.com>
To:     <jic23@kernel.org>, <lars@metafoo.de>, <pmeerw@pmeerw.net>,
        <robh+dt@kernel.org>, <joel@jms.id.au>, <andrew@aj.id.au>,
        <p.zabel@pengutronix.de>, <lgirdwood@gmail.com>,
        <broonie@kernel.org>, <linux-iio@vger.kernel.org>,
        <devicetree@vger.kernel.org>,
        <linux-arm-kernel@lists.infradead.org>,
        <linux-aspeed@lists.ozlabs.org>, <linux-kernel@vger.kernel.org>
CC:     <BMC-SW@aspeedtech.com>
Subject: [RESEND v4 09/15] iio: adc: aspeed: Use devm_add_action_or_reset.
Date:   Tue, 24 Aug 2021 17:12:37 +0800
In-Reply-To: <20210824091243.9393-1-billy_tsai@aspeedtech.com>
References: <20210824091243.9393-1-billy_tsai@aspeedtech.com>
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Precedence: bulk

This patch use devm_add_action_or_reset to handle the error in probe
phase.

Signed-off-by: Billy Tsai <billy_tsai@aspeedtech.com>
---
 drivers/iio/adc/aspeed_adc.c | 92 +++++++++++++++++++++---------------
 1 file changed, 55 insertions(+), 37 deletions(-)

diff --git a/drivers/iio/adc/aspeed_adc.c b/drivers/iio/adc/aspeed_adc.c
index 52db38be9699..1c87e12a0cab 100644
--- a/drivers/iio/adc/aspeed_adc.c
+++ b/drivers/iio/adc/aspeed_adc.c
@@ -187,6 +187,27 @@ static const struct iio_info aspeed_adc_iio_info = {
 	.debugfs_reg_access = aspeed_adc_reg_access,
 };
 
+static void aspeed_adc_unregister_divider(void *data)
+{
+	struct clk_hw *clk = data;
+
+	clk_hw_unregister_divider(clk);
+}
+
+static void aspeed_adc_reset_assert(void *data)
+{
+	struct reset_control *rst = data;
+
+	reset_control_assert(rst);
+}
+
+static void aspeed_adc_clk_disable_unprepare(void *data)
+{
+	struct clk *clk = data;
+
+	clk_disable_unprepare(clk);
+}
+
 static int aspeed_adc_vref_config(struct iio_dev *indio_dev)
 {
 	struct aspeed_adc_data *data = iio_priv(indio_dev);
@@ -232,6 +253,12 @@ static int aspeed_adc_probe(struct platform_device *pdev)
 			&data->clk_lock);
 		if (IS_ERR(data->clk_prescaler))
 			return PTR_ERR(data->clk_prescaler);
+
+		ret = devm_add_action_or_reset(data->dev,
+					       aspeed_adc_unregister_divider,
+					       data->clk_prescaler);
+		if (ret)
+			return ret;
 		snprintf(clk_parent_name, 32, clk_name);
 		scaler_flags = CLK_SET_RATE_PARENT;
 	}
@@ -244,23 +271,30 @@ static int aspeed_adc_probe(struct platform_device *pdev)
 		&pdev->dev, clk_name, clk_parent_name, scaler_flags,
 		data->base + ASPEED_REG_CLOCK_CONTROL, 0,
 		data->model_data->scaler_bit_width, 0, &data->clk_lock);
-	if (IS_ERR(data->clk_scaler)) {
-		ret = PTR_ERR(data->clk_scaler);
-		goto scaler_error;
-	}
+	if (IS_ERR(data->clk_scaler))
+		return PTR_ERR(data->clk_scaler);
+
+	ret = devm_add_action_or_reset(data->dev, aspeed_adc_unregister_divider,
+				       data->clk_scaler);
+	if (ret)
+		return ret;
 
 	data->rst = devm_reset_control_get_exclusive(&pdev->dev, NULL);
 	if (IS_ERR(data->rst)) {
 		dev_err(&pdev->dev,
 			"invalid or missing reset controller device tree entry");
-		ret = PTR_ERR(data->rst);
-		goto reset_error;
+		return PTR_ERR(data->rst);
 	}
 	reset_control_deassert(data->rst);
 
+	ret = devm_add_action_or_reset(data->dev, aspeed_adc_reset_assert,
+				       data->rst);
+	if (ret)
+		return ret;
+
 	ret = aspeed_adc_vref_config(indio_dev);
 	if (ret)
-		goto vref_config_error;
+		return ret;
 
 	if (data->model_data->wait_init_sequence) {
 		/* Enable engine in normal mode. */
@@ -277,13 +311,19 @@ static int aspeed_adc_probe(struct platform_device *pdev)
 					 ASPEED_ADC_INIT_POLLING_TIME,
 					 ASPEED_ADC_INIT_TIMEOUT);
 		if (ret)
-			goto poll_timeout_error;
+			return ret;
 	}
 
 	/* Start all channels in normal mode. */
 	ret = clk_prepare_enable(data->clk_scaler->clk);
 	if (ret)
-		goto clk_enable_error;
+		return ret;
+
+	ret = devm_add_action_or_reset(data->dev,
+				       aspeed_adc_clk_disable_unprepare,
+				       data->clk_scaler->clk);
+	if (ret)
+		return ret;
 
 	adc_engine_control_reg_val =
 		ASPEED_ADC_CTRL_CHANNEL |
@@ -299,41 +339,19 @@ static int aspeed_adc_probe(struct platform_device *pdev)
 	indio_dev->num_channels = data->model_data->num_channels;
 
 	ret = iio_device_register(indio_dev);
-	if (ret)
-		goto iio_register_error;
-
+	if (ret) {
+		writel(FIELD_PREP(ASPEED_ADC_OP_MODE,
+				  ASPEED_ADC_OP_MODE_PWR_DOWN),
+		       data->base + ASPEED_REG_ENGINE_CONTROL);
+		return ret;
+	}
 	return 0;
-
-iio_register_error:
-	writel(FIELD_PREP(ASPEED_ADC_OP_MODE, ASPEED_ADC_OP_MODE_PWR_DOWN),
-	       data->base + ASPEED_REG_ENGINE_CONTROL);
-	clk_disable_unprepare(data->clk_scaler->clk);
-clk_enable_error:
-poll_timeout_error:
-vref_config_error:
-	reset_control_assert(data->rst);
-reset_error:
-	clk_hw_unregister_divider(data->clk_scaler);
-scaler_error:
-	if (data->model_data->need_prescaler)
-		clk_hw_unregister_divider(data->clk_prescaler);
-	return ret;
 }
 
 static int aspeed_adc_remove(struct platform_device *pdev)
 {
 	struct iio_dev *indio_dev = platform_get_drvdata(pdev);
-	struct aspeed_adc_data *data = iio_priv(indio_dev);
-
 	iio_device_unregister(indio_dev);
-	writel(FIELD_PREP(ASPEED_ADC_OP_MODE, ASPEED_ADC_OP_MODE_PWR_DOWN),
-	       data->base + ASPEED_REG_ENGINE_CONTROL);
-	clk_disable_unprepare(data->clk_scaler->clk);
-	reset_control_assert(data->rst);
-	clk_hw_unregister_divider(data->clk_scaler);
-	if (data->model_data->need_prescaler)
-		clk_hw_unregister_divider(data->clk_prescaler);
-
 	return 0;
 }
 
-- 
2.25.1