backlight: gpio_backlight: Enable ACPI enumeration

ACPI allows to enumerate specific devices by using compatible strings.
Enable that enumeration for GPIO based backlight devices.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Acked-by: Daniel Thompson <daniel.thompson@linaro.org>
Signed-off-by: Lee Jones <lee.jones@linaro.org>

diff --git a/drivers/video/backlight/gpio_backlight.c b/drivers/video/backlight/gpio_backlight.c
index e470da95d806fb27f63cd647e65ddbcfd3057a43..05c12df62b27ce41198f22fd57f90d89c8c2e1b4 100644 (file)
--- a/drivers/video/backlight/gpio_backlight.c
+++ b/drivers/video/backlight/gpio_backlight.c
@@ -18,6 +18,7 @@
 #include <linux/of_gpio.h>
 #include <linux/platform_data/gpio_backlight.h>
 #include <linux/platform_device.h>
+#include <linux/property.h>
 #include <linux/slab.h>
 
 struct gpio_backlight {
@@ -61,11 +62,10 @@ static int gpio_backlight_probe_dt(struct platform_device *pdev,
                                   struct gpio_backlight *gbl)
 {
        struct device *dev = &pdev->dev;
-       struct device_node *np = dev->of_node;
        enum gpiod_flags flags;
        int ret;
 
-       gbl->def_value = of_property_read_bool(np, "default-on");
+       gbl->def_value = device_property_read_bool(dev, "default-on");
        flags = gbl->def_value ? GPIOD_OUT_HIGH : GPIOD_OUT_LOW;
 
        gbl->gpiod = devm_gpiod_get(dev, NULL, flags);
@@ -89,26 +89,19 @@ static int gpio_backlight_probe(struct platform_device *pdev)
        struct backlight_properties props;
        struct backlight_device *bl;
        struct gpio_backlight *gbl;
-       struct device_node *np = pdev->dev.of_node;
        int ret;
 
-       if (!pdata && !np) {
-               dev_err(&pdev->dev,
-                       "failed to find platform data or device tree node.\n");
-               return -ENODEV;
-       }
-
        gbl = devm_kzalloc(&pdev->dev, sizeof(*gbl), GFP_KERNEL);
        if (gbl == NULL)
                return -ENOMEM;
 
        gbl->dev = &pdev->dev;
 
-       if (np) {
+       if (pdev->dev.fwnode) {
                ret = gpio_backlight_probe_dt(pdev, gbl);
                if (ret)
                        return ret;
-       } else {
+       } else if (pdata) {
                /*
                 * Legacy platform data GPIO retrieveal. Do not expand
                 * the use of this code path, currently only used by one
@@ -129,6 +122,10 @@ static int gpio_backlight_probe(struct platform_device *pdev)
                gbl->gpiod = gpio_to_desc(pdata->gpio);
                if (!gbl->gpiod)
                        return -EINVAL;
+       } else {
+               dev_err(&pdev->dev,
+                       "failed to find platform data or device tree node.\n");
+               return -ENODEV;
        }
 
        memset(&props, 0, sizeof(props));
@@ -149,19 +146,17 @@ static int gpio_backlight_probe(struct platform_device *pdev)
        return 0;
 }
 
-#ifdef CONFIG_OF
 static struct of_device_id gpio_backlight_of_match[] = {
        { .compatible = "gpio-backlight" },
        { /* sentinel */ }
 };
 
 MODULE_DEVICE_TABLE(of, gpio_backlight_of_match);
-#endif
 
 static struct platform_driver gpio_backlight_driver = {
        .driver         = {
                .name           = "gpio-backlight",
-               .of_match_table = of_match_ptr(gpio_backlight_of_match),
+               .of_match_table = gpio_backlight_of_match,
        },
        .probe          = gpio_backlight_probe,
 };