pinctrl: mt7622: stop using the deprecated pinctrl_add_gpio_range

If the pinctrl node has the gpio-ranges property, the range will be added
by the gpio core and doesn't need to be added by the pinctrl driver.

But for keeping backward compatibility, an explicit pinctrl_add_gpio_range
is still needed to be called when there is a missing gpio-ranges in pinctrl
node in old dts files.

Cc: stable@vger.kernel.org
Fixes: d6ed93551320 ("pinctrl: mediatek: add pinctrl driver for MT7622 SoC")
Signed-off-by: Sean Wang <sean.wang@mediatek.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

diff --git a/drivers/pinctrl/mediatek/pinctrl-mt7622.c b/drivers/pinctrl/mediatek/pinctrl-mt7622.c
index 42155d4e7f1b14d4e5eee3ae25ab3e2fc0aefd07..055074bba2468f7feb397801bce63861385bb339 100644 (file)
--- a/drivers/pinctrl/mediatek/pinctrl-mt7622.c
+++ b/drivers/pinctrl/mediatek/pinctrl-mt7622.c
@@ -1508,11 +1508,20 @@ static int mtk_build_gpiochip(struct mtk_pinctrl *hw, struct device_node *np)
        if (ret < 0)
                return ret;
 
-       ret = gpiochip_add_pin_range(chip, dev_name(hw->dev), 0, 0,
-                                    chip->ngpio);
-       if (ret < 0) {
-               gpiochip_remove(chip);
-               return ret;
+       /* Just for backward compatible for these old pinctrl nodes without
+        * "gpio-ranges" property. Otherwise, called directly from a
+        * DeviceTree-supported pinctrl driver is DEPRECATED.
+        * Please see Section 2.1 of
+        * Documentation/devicetree/bindings/gpio/gpio.txt on how to
+        * bind pinctrl and gpio drivers via the "gpio-ranges" property.
+        */
+       if (!of_find_property(np, "gpio-ranges", NULL)) {
+               ret = gpiochip_add_pin_range(chip, dev_name(hw->dev), 0, 0,
+                                            chip->ngpio);
+               if (ret < 0) {
+                       gpiochip_remove(chip);
+                       return ret;
+               }
        }
 
        return 0;