ramips: modernize pwm driver

Add more devm usage.

Signed-off-by: Rosen Penev <[email protected]>
Link: https://github.com/openwrt/openwrt/pull/16649
Signed-off-by: Hauke Mehrtens <[email protected]>

target/linux/ramips/patches-6.6/845-pwm-add-mediatek-support.patch

@@ -41,7 +41,7 @@ Signed-off-by: John Crispin <[email protected]>
  obj-$(CONFIG_PWM_MXS)		+= pwm-mxs.o
 --- /dev/null
 +++ b/drivers/pwm/pwm-mediatek-ramips.c
-@@ -0,0 +1,197 @@
+@@ -0,0 +1,187 @@
 +/*
 + * Mediatek Pulse Width Modulator driver
 + *
@@ -178,30 +178,23 @@ Signed-off-by: John Crispin <[email protected]>
 +static int mtk_pwm_probe(struct platform_device *pdev)
 +{
 +	struct mtk_pwm_chip *pc;
-+	struct resource *r;
-+	int ret;
 +
 +	pc = devm_kzalloc(&pdev->dev, sizeof(*pc), GFP_KERNEL);
 +	if (!pc)
 +		return -ENOMEM;
 +
-+	r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-+	pc->mmio_base = devm_ioremap_resource(&pdev->dev, r);
++	pc->mmio_base = devm_platform_ioremap_resource(pdev, 0);
 +	if (IS_ERR(pc->mmio_base))
 +		return PTR_ERR(pc->mmio_base);
 +
-+	platform_set_drvdata(pdev, pc);
-+
 +	pc->chip.dev = &pdev->dev;
 +	pc->chip.ops = &mtk_pwm_ops;
 +	pc->chip.base = -1;
 +	pc->chip.npwm = NUM_PWM;
 +
-+	ret = pwmchip_add(&pc->chip);
-+	if (ret < 0)
-+		dev_err(&pdev->dev, "pwmchip_add() failed: %d\n", ret);
++	platform_set_drvdata(pdev, pc);
 +
-+	return ret;
++	return devm_pwmchip_add(&pdev->dev, &pc->chip);
 +}
 +
 +static int mtk_pwm_remove(struct platform_device *pdev)
@@ -212,8 +205,6 @@ Signed-off-by: John Crispin <[email protected]>
 +	for (i = 0; i < NUM_PWM; i++)
 +		pwm_disable(&pc->chip.pwms[i]);
 +
-+	pwmchip_remove(&pc->chip);
-+
 +	return 0;
 +}
 +
@@ -227,7 +218,6 @@ Signed-off-by: John Crispin <[email protected]>
 +static struct platform_driver mtk_pwm_driver = {
 +	.driver = {
 +		.name = "mtk-pwm",
-+		.owner = THIS_MODULE,
 +		.of_match_table = mtk_pwm_of_match,
 +	},
 +	.probe = mtk_pwm_probe,