ath79: gpio-rb4xx: use devm_mutex_init

Also use devm for gpiochip_add_data.

Allows completely removing the _remove function.

Signed-off-by: Rosen Penev <[email protected]>
Link: https://github.com/openwrt/openwrt/pull/16622
Signed-off-by: Robert Marko <[email protected]>

target/linux/ath79/files/drivers/gpio/gpio-rb4xx.c

@@ -105,6 +105,7 @@ static int rb4xx_gpio_probe(struct platform_device *pdev)
 	struct device *parent = dev->parent;
 	struct rb4xx_gpio *gpio;
 	u32 val;
+	int err;
 
 	if (!parent)
 		return -ENODEV;
@@ -117,7 +118,10 @@ static int rb4xx_gpio_probe(struct platform_device *pdev)
 	gpio->cpld	= dev_get_drvdata(parent);
 	gpio->dev	= dev;
 	gpio->values	= 0;
-	mutex_init(&gpio->lock);
+
+	err = devm_mutex_init(&pdev->dev, &gpio->lock);
+	if (err)
+		return err;
 
 	gpio->chip.label		= "rb4xx-gpio";
 	gpio->chip.parent		= dev;
@@ -134,17 +138,7 @@ static int rb4xx_gpio_probe(struct platform_device *pdev)
 	if (!of_property_read_u32(dev->of_node, "base", &val))
 		gpio->chip.base = val;
 
-	return gpiochip_add_data(&gpio->chip, gpio);
-}
-
-static int rb4xx_gpio_remove(struct platform_device *pdev)
-{
-	struct rb4xx_gpio *gpio = platform_get_drvdata(pdev);
-
-	gpiochip_remove(&gpio->chip);
-	mutex_destroy(&gpio->lock);
-
-	return 0;
+	return devm_gpiochip_add_data(&pdev->dev, &gpio->chip, gpio);
 }
 
 static const struct platform_device_id rb4xx_gpio_id_table[] = {
@@ -155,7 +149,6 @@ MODULE_DEVICE_TABLE(platform, rb4xx_gpio_id_table);
 
 static struct platform_driver rb4xx_gpio_driver = {
 	.probe = rb4xx_gpio_probe,
-	.remove = rb4xx_gpio_remove,
 	.id_table = rb4xx_gpio_id_table,
 	.driver = {
 		.name = "rb4xx-gpio",