linux-kernel - [PATCH] pwm: meson: Simplify probe function with dev_err

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Date:   Thu, 18 Aug 2022 15:22:34 +0800
From:   zhaoxiao <zhaoxiao@...ontech.com>
To:     thierry.reding@...il.com, narmstrong@...libre.com,
        khilman@...libre.com
Cc:     u.kleine-koenig@...gutronix.de, jbrunet@...libre.com,
        martin.blumenstingl@...glemail.com, linux-pwm@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-amlogic@...ts.infradead.org, linux-kernel@...r.kernel.org,
        zhaoxiao <zhaoxiao@...ontech.com>
Subject: [PATCH] pwm: meson: Simplify probe function with dev_err_probe()

Switch to dev_err_probe() to remove all dev_err() -> return repeated
patterns, simplifying and shortening the probe function.

Signed-off-by: zhaoxiao <zhaoxiao@...ontech.com>
---
 drivers/pwm/pwm-meson.c | 53 ++++++++++++++---------------------------
 1 file changed, 18 insertions(+), 35 deletions(-)

diff --git a/drivers/pwm/pwm-meson.c b/drivers/pwm/pwm-meson.c
index 57112f438c6d..43ce8d9a33d2 100644
--- a/drivers/pwm/pwm-meson.c
+++ b/drivers/pwm/pwm-meson.c
@@ -126,20 +126,16 @@ static int meson_pwm_request(struct pwm_chip *chip, struct pwm_device *pwm)
 
 	if (channel->clk_parent) {
 		err = clk_set_parent(channel->clk, channel->clk_parent);
-		if (err < 0) {
-			dev_err(dev, "failed to set parent %s for %s: %d\n",
+		if (err < 0)
+			return dev_err_probe(dev, err, "failed to set parent %s for %s\n",
 				__clk_get_name(channel->clk_parent),
-				__clk_get_name(channel->clk), err);
-			return err;
-		}
+				__clk_get_name(channel->clk));
 	}
 
 	err = clk_prepare_enable(channel->clk);
-	if (err < 0) {
-		dev_err(dev, "failed to enable clock %s: %d\n",
-			__clk_get_name(channel->clk), err);
-		return err;
-	}
+	if (err < 0)
+		return dev_err_probe(dev, err, "failed to enable clock %s\n",
+			__clk_get_name(channel->clk));
 
 	return 0;
 }
@@ -166,24 +162,18 @@ static int meson_pwm_calc(struct meson_pwm *meson, struct pwm_device *pwm,
 		duty = period - duty;
 
 	fin_freq = clk_get_rate(channel->clk);
-	if (fin_freq == 0) {
-		dev_err(meson->chip.dev, "invalid source clock frequency\n");
-		return -EINVAL;
-	}
+	if (fin_freq == 0)
+		return dev_err_probe(meson->chip.dev, -EINVAL, "invalid source clock frequency\n");
 
 	dev_dbg(meson->chip.dev, "fin_freq: %lu Hz\n", fin_freq);
 
 	pre_div = div64_u64(fin_freq * (u64)period, NSEC_PER_SEC * 0xffffLL);
-	if (pre_div > MISC_CLK_DIV_MASK) {
-		dev_err(meson->chip.dev, "unable to get period pre_div\n");
-		return -EINVAL;
-	}
+	if (pre_div > MISC_CLK_DIV_MASK)
+		return dev_err_probe(meson->chip.dev, -EINVAL, "unable to get period pre_div\n");
 
 	cnt = div64_u64(fin_freq * (u64)period, NSEC_PER_SEC * (pre_div + 1));
-	if (cnt > 0xffff) {
-		dev_err(meson->chip.dev, "unable to get period cnt\n");
-		return -EINVAL;
-	}
+	if (cnt > 0xffff)
+		return dev_err_probe(meson->chip.dev, -EINVAL, "unable to get period cnt\n");
 
 	dev_dbg(meson->chip.dev, "period=%u pre_div=%u cnt=%u\n", period,
 		pre_div, cnt);
@@ -200,10 +190,8 @@ static int meson_pwm_calc(struct meson_pwm *meson, struct pwm_device *pwm,
 		/* Then check is we can have the duty with the same pre_div */
 		duty_cnt = div64_u64(fin_freq * (u64)duty,
 				     NSEC_PER_SEC * (pre_div + 1));
-		if (duty_cnt > 0xffff) {
-			dev_err(meson->chip.dev, "unable to get duty cycle\n");
-			return -EINVAL;
-		}
+		if (duty_cnt > 0xffff)
+			return dev_err_probe(meson->chip.dev, -EINVAL, "unable to get duty cycle\n");
 
 		dev_dbg(meson->chip.dev, "duty=%u pre_div=%u duty_cnt=%u\n",
 			duty, pre_div, duty_cnt);
@@ -509,11 +497,8 @@ static int meson_pwm_init_channels(struct meson_pwm *meson)
 		channel->mux.hw.init = &init;
 
 		channel->clk = devm_clk_register(dev, &channel->mux.hw);
-		if (IS_ERR(channel->clk)) {
-			err = PTR_ERR(channel->clk);
-			dev_err(dev, "failed to register %s: %d\n", name, err);
-			return err;
-		}
+		if (IS_ERR(channel->clk))
+			return dev_err_probe(dev, PTR_ERR(channel->clk), "failed to register %s\n", name);
 
 		snprintf(name, sizeof(name), "clkin%u", i);
 
@@ -550,10 +535,8 @@ static int meson_pwm_probe(struct platform_device *pdev)
 		return err;
 
 	err = devm_pwmchip_add(&pdev->dev, &meson->chip);
-	if (err < 0) {
-		dev_err(&pdev->dev, "failed to register PWM chip: %d\n", err);
-		return err;
-	}
+	if (err < 0)
+		return dev_err_probe(&pdev->dev, err, "failed to register PWM chip\n");
 
 	return 0;
 }
-- 
2.20.1