[PATCH] pwm: atmel: Simplify using devm functions

[PATCH] pwm: atmel: Simplify using devm functions

[Uwe Kleine-König]

For all resources used by the driver there is a devm variant to allocate
these. This makes it unnecessary to implement an error path or a remove
function.

While at it also use dev_err_probe() to compact returning an error.

With the remove callback gone, there is no user of driver data left, so
the call to platform_set_drvdata() can also be dropped.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
---
 drivers/pwm/pwm-atmel.c | 38 ++++++++------------------------------
 1 file changed, 8 insertions(+), 30 deletions(-)

diff --git a/drivers/pwm/pwm-atmel.c b/drivers/pwm/pwm-atmel.c
index 5f7d286871cf..ade0331159f7 100644
--- a/drivers/pwm/pwm-atmel.c
+++ b/drivers/pwm/pwm-atmel.c
@@ -482,42 +482,21 @@ static int atmel_pwm_probe(struct platform_device *pdev)
 	if (IS_ERR(atmel_pwm->base))
 		return PTR_ERR(atmel_pwm->base);
 
-	atmel_pwm->clk = devm_clk_get(&pdev->dev, NULL);
+	atmel_pwm->clk = devm_clk_get_prepared(&pdev->dev, NULL);
 	if (IS_ERR(atmel_pwm->clk))
-		return PTR_ERR(atmel_pwm->clk);
-
-	ret = clk_prepare(atmel_pwm->clk);
-	if (ret) {
-		dev_err(&pdev->dev, "failed to prepare PWM clock\n");
-		return ret;
-	}
+		return dev_err_probe(&pdev->dev, PTR_ERR(atmel_pwm->clk),
+				     "failed to get prepared PWM clock\n");
 
 	atmel_pwm->chip.dev = &pdev->dev;
 	atmel_pwm->chip.ops = &atmel_pwm_ops;
 	atmel_pwm->chip.npwm = 4;
 
-	ret = pwmchip_add(&atmel_pwm->chip);
-	if (ret < 0) {
-		dev_err(&pdev->dev, "failed to add PWM chip %d\n", ret);
-		goto unprepare_clk;
-	}
+	ret = devm_pwmchip_add(&pdev->dev, &atmel_pwm->chip);
+	if (ret < 0)
+		return dev_err_probe(&pdev->dev, ret,
+				     "failed to add PWM chip\n");
 
-	platform_set_drvdata(pdev, atmel_pwm);
-
-	return ret;
-
-unprepare_clk:
-	clk_unprepare(atmel_pwm->clk);
-	return ret;
-}
-
-static void atmel_pwm_remove(struct platform_device *pdev)
-{
-	struct atmel_pwm_chip *atmel_pwm = platform_get_drvdata(pdev);
-
-	pwmchip_remove(&atmel_pwm->chip);
-
-	clk_unprepare(atmel_pwm->clk);
+	return 0;
 }
 
 static struct platform_driver atmel_pwm_driver = {
@@ -526,7 +505,6 @@ static struct platform_driver atmel_pwm_driver = {
 		.of_match_table = of_match_ptr(atmel_pwm_dt_ids),
 	},
 	.probe = atmel_pwm_probe,
-	.remove_new = atmel_pwm_remove,
 };
 module_platform_driver(atmel_pwm_driver);
 

base-commit: 06c2afb862f9da8dc5efa4b6076a0e48c3fbaaa5
-- 
2.39.2


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Re: [PATCH] pwm: atmel: Simplify using devm functions

[Thierry Reding]

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On Wed, Jul 19, 2023 at 09:32:13PM +0200, Uwe Kleine-König wrote:
> For all resources used by the driver there is a devm variant to allocate
> these. This makes it unnecessary to implement an error path or a remove
> function.
> 
> While at it also use dev_err_probe() to compact returning an error.
> 
> With the remove callback gone, there is no user of driver data left, so
> the call to platform_set_drvdata() can also be dropped.
> 
> Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
> ---
>  drivers/pwm/pwm-atmel.c | 38 ++++++++------------------------------
>  1 file changed, 8 insertions(+), 30 deletions(-)

Doesn't apply to the for-next branch, please rebase.

Thierry

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