pwm: bcm-iproc: Simplify using devm functions

With devm_clk_get_enabled() the call to clk_disable_unprepare() can be
dropped from the error path and the remove callback. With
devm_pwmchip_add() pwmchip_remove() can be dropped. Then the remove
callback is empty and can go away, too.

Also use dev_err_probe() for simplified (and improved) error reporting.

Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Uwe Kleine-König <[email protected]>
Signed-off-by: Thierry Reding <[email protected]>

Author: Uwe Kleine-König

drivers/pwm/pwm-bcm-iproc.c

@@ -206,18 +206,10 @@ static int iproc_pwmc_probe(struct platform_device *pdev)
 	if (IS_ERR(ip->base))
 		return PTR_ERR(ip->base);
 
-	ip->clk = devm_clk_get(&pdev->dev, NULL);
-	if (IS_ERR(ip->clk)) {
-		dev_err(&pdev->dev, "failed to get clock: %ld\n",
-			PTR_ERR(ip->clk));
-		return PTR_ERR(ip->clk);
-	}
-
-	ret = clk_prepare_enable(ip->clk);
-	if (ret < 0) {
-		dev_err(&pdev->dev, "failed to enable clock: %d\n", ret);
-		return ret;
-	}
+	ip->clk = devm_clk_get_enabled(&pdev->dev, NULL);
+	if (IS_ERR(ip->clk))
+		return dev_err_probe(&pdev->dev, PTR_ERR(ip->clk),
+				     "failed to get clock\n");
 
 	/* Set full drive and normal polarity for all channels */
 	value = readl(ip->base + IPROC_PWM_CTRL_OFFSET);
@@ -229,22 +221,12 @@ static int iproc_pwmc_probe(struct platform_device *pdev)
 
 	writel(value, ip->base + IPROC_PWM_CTRL_OFFSET);
 
-	ret = pwmchip_add(&ip->chip);
-	if (ret < 0) {
-		dev_err(&pdev->dev, "failed to add PWM chip: %d\n", ret);
-		clk_disable_unprepare(ip->clk);
-	}
-
-	return ret;
-}
-
-static void iproc_pwmc_remove(struct platform_device *pdev)
-{
-	struct iproc_pwmc *ip = platform_get_drvdata(pdev);
+	ret = devm_pwmchip_add(&pdev->dev, &ip->chip);
+	if (ret < 0)
+		return dev_err_probe(&pdev->dev, ret,
+				     "failed to add PWM chip\n");
 
-	pwmchip_remove(&ip->chip);
-
-	clk_disable_unprepare(ip->clk);
+	return 0;
 }
 
 static const struct of_device_id bcm_iproc_pwmc_dt[] = {
@@ -259,7 +241,6 @@ static struct platform_driver iproc_pwmc_driver = {
 		.of_match_table = bcm_iproc_pwmc_dt,
 	},
 	.probe = iproc_pwmc_probe,
-	.remove_new = iproc_pwmc_remove,
 };
 module_platform_driver(iproc_pwmc_driver);