gpio: loongson1: Add DT support

This patch adds DT support for Loongson-1 GPIO driver.

Signed-off-by: Keguang Zhang <keguang.zhang@gmail.com>
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>

diff --git a/drivers/gpio/gpio-loongson1.c b/drivers/gpio/gpio-loongson1.c
index dddfc71f0e100032bb385a47b7749a4ae654816e..6ca3b969db4df231517d021a7b4b5e3ddcf626f7 100644 (file)
--- a/drivers/gpio/gpio-loongson1.c
+++ b/drivers/gpio/gpio-loongson1.c
@@ -68,25 +68,38 @@ static int ls1x_gpio_probe(struct platform_device *pdev)
        ls1x_gc->gc.owner = THIS_MODULE;
        ls1x_gc->gc.request = ls1x_gpio_request;
        ls1x_gc->gc.free = ls1x_gpio_free;
-       ls1x_gc->gc.base = pdev->id * 32;
+       /*
+        * Clear ngpio to let gpiolib get the correct number
+        * by reading ngpios property
+        */
+       ls1x_gc->gc.ngpio = 0;
 
        ret = devm_gpiochip_add_data(dev, &ls1x_gc->gc, ls1x_gc);
        if (ret)
                goto err;
 
        platform_set_drvdata(pdev, ls1x_gc);
-       dev_info(dev, "Loongson1 GPIO driver registered\n");
+
+       dev_info(dev, "GPIO controller registered with %d pins\n",
+                ls1x_gc->gc.ngpio);
 
        return 0;
 err:
-       dev_err(dev, "failed to register GPIO device\n");
+       dev_err(dev, "failed to register GPIO controller\n");
        return ret;
 }
 
+static const struct of_device_id ls1x_gpio_dt_ids[] = {
+       { .compatible = "loongson,ls1x-gpio" },
+       { /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, ls1x_gpio_dt_ids);
+
 static struct platform_driver ls1x_gpio_driver = {
        .probe  = ls1x_gpio_probe,
        .driver = {
                .name   = "ls1x-gpio",
+               .of_match_table = ls1x_gpio_dt_ids,
        },
 };