pwm: brcmstb: 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/[e-mail]
Signed-off-by: Uwe Kleine-König <[e-mail]>
Signed-off-by: Thierry Reding <[e-mail]>

drivers/pwm/pwm-brcmstb.c

···
 	if (!p)
 		return -ENOMEM;
 
-	p->clk = devm_clk_get(&pdev->dev, NULL);
-	if (IS_ERR(p->clk)) {
-		dev_err(&pdev->dev, "failed to obtain clock\n");
-		return PTR_ERR(p->clk);
-	}
-
-	ret = clk_prepare_enable(p->clk);
-	if (ret < 0) {
-		dev_err(&pdev->dev, "failed to enable clock: %d\n", ret);
-		return ret;
-	}
+	p->clk = devm_clk_get_enabled(&pdev->dev, NULL);
+	if (IS_ERR(p->clk))
+		return dev_err_probe(&pdev->dev, PTR_ERR(p->clk),
+				     "failed to obtain clock\n");
 
 	platform_set_drvdata(pdev, p);
 
···
 	p->chip.npwm = 2;
 
 	p->base = devm_platform_ioremap_resource(pdev, 0);
-	if (IS_ERR(p->base)) {
-		ret = PTR_ERR(p->base);
-		goto out_clk;
-	}
+	if (IS_ERR(p->base))
+		return PTR_ERR(p->base);
 
-	ret = pwmchip_add(&p->chip);
-	if (ret) {
-		dev_err(&pdev->dev, "failed to add PWM chip: %d\n", ret);
-		goto out_clk;
-	}
+	ret = devm_pwmchip_add(&pdev->dev, &p->chip);
+	if (ret)
+		return dev_err_probe(&pdev->dev, ret, "failed to add PWM chip\n");
 
 	return 0;
-
-out_clk:
-	clk_disable_unprepare(p->clk);
-	return ret;
-}
-
-static void brcmstb_pwm_remove(struct platform_device *pdev)
-{
-	struct brcmstb_pwm *p = platform_get_drvdata(pdev);
-
-	pwmchip_remove(&p->chip);
-	clk_disable_unprepare(p->clk);
 }
 
 #ifdef CONFIG_PM_SLEEP
···
 
 static struct platform_driver brcmstb_pwm_driver = {
 	.probe = brcmstb_pwm_probe,
-	.remove_new = brcmstb_pwm_remove,
 	.driver = {
 		.name = "pwm-brcmstb",
 		.of_match_table = brcmstb_pwm_of_match,