gpio: pl061: hook request if gpio-ranges avaiable

Gpio-ranges property is useful to represent which GPIOs correspond
to which pins on which pin controllers. But there may be some gpios
without pinctrl operation. So check whether gpio-ranges property
exists in device node first.

Signed-off-by: Yunlei He <heyunlei@huawei.com>
Signed-off-by: Xinwei Kong <kong.kongxinwei@hisilicon.com>
Signed-off-by: Haojian Zhuang <haojian.zhuang@linaro.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

diff --git a/drivers/gpio/gpio-pl061.c b/drivers/gpio/gpio-pl061.c
index 84b49cfb81a8b3a12f0c8c3ab2e52c6cb83bf924..04756130437f193c12e6e6033ed5b6fff6be6b43 100644 (file)
--- a/drivers/gpio/gpio-pl061.c
+++ b/drivers/gpio/gpio-pl061.c
@@ -52,28 +52,34 @@ struct pl061_gpio {
 
        void __iomem            *base;
        struct gpio_chip        gc;
+       bool                    uses_pinctrl;
 
 #ifdef CONFIG_PM
        struct pl061_context_save_regs csave_regs;
 #endif
 };
 
-static int pl061_gpio_request(struct gpio_chip *chip, unsigned offset)
+static int pl061_gpio_request(struct gpio_chip *gc, unsigned offset)
 {
        /*
         * Map back to global GPIO space and request muxing, the direction
         * parameter does not matter for this controller.
         */
-       int gpio = chip->base + offset;
+       struct pl061_gpio *chip = container_of(gc, struct pl061_gpio, gc);
+       int gpio = gc->base + offset;
 
-       return pinctrl_request_gpio(gpio);
+       if (chip->uses_pinctrl)
+               return pinctrl_request_gpio(gpio);
+       return 0;
 }
 
-static void pl061_gpio_free(struct gpio_chip *chip, unsigned offset)
+static void pl061_gpio_free(struct gpio_chip *gc, unsigned offset)
 {
-       int gpio = chip->base + offset;
+       struct pl061_gpio *chip = container_of(gc, struct pl061_gpio, gc);
+       int gpio = gc->base + offset;
 
-       pinctrl_free_gpio(gpio);
+       if (chip->uses_pinctrl)
+               pinctrl_free_gpio(gpio);
 }
 
 static int pl061_direction_input(struct gpio_chip *gc, unsigned offset)
@@ -263,6 +269,8 @@ static int pl061_probe(struct amba_device *adev, const struct amba_id *id)
                return PTR_ERR(chip->base);
 
        spin_lock_init(&chip->lock);
+       if (of_property_read_bool(dev->of_node, "gpio-ranges"))
+               chip->uses_pinctrl = true;
 
        chip->gc.request = pl061_gpio_request;
        chip->gc.free = pl061_gpio_free;