gpiolib: of: add a quirk for legacy names in Mediatek mt2701-cs42448

The driver is using non-standard "i2s1-in-sel-gpio1" and
"i2s1-in-sel-gpio2" names to describe its gpios. In preparation to
converting to the standard naming (i2s1-in-sel-gpios) and switching the
driver to gpiod API add a quirk to gpiolib to keep compatibility with
existing DTSes.

Reviewed-by: Daniel Thompson <daniel.thompson@linaro.org>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>

diff --git a/drivers/gpio/gpiolib-of.c b/drivers/gpio/gpiolib-of.c
index 0e4e1291604d67da9fcfd3f9f1c4da86f963eb90..cef4f66341256fadc39d3d2b093efb94888a8efc 100644 (file)
--- a/drivers/gpio/gpiolib-of.c
+++ b/drivers/gpio/gpiolib-of.c
@@ -488,6 +488,38 @@ static struct gpio_desc *of_find_usb_gpio(struct device_node *np,
        return of_get_named_gpiod_flags(np, con_id, idx, of_flags);
 }
 
+static struct gpio_desc *of_find_mt2701_gpio(struct device_node *np,
+                                            const char *con_id,
+                                            unsigned int idx,
+                                            enum of_gpio_flags *of_flags)
+{
+       struct gpio_desc *desc;
+       const char *legacy_id;
+
+       if (!IS_ENABLED(CONFIG_SND_SOC_MT2701_CS42448))
+               return ERR_PTR(-ENOENT);
+
+       if (!of_device_is_compatible(np, "mediatek,mt2701-cs42448-machine"))
+               return ERR_PTR(-ENOENT);
+
+       if (!con_id || strcmp(con_id, "i2s1-in-sel"))
+               return ERR_PTR(-ENOENT);
+
+       if (idx == 0)
+               legacy_id = "i2s1-in-sel-gpio1";
+       else if (idx == 1)
+               legacy_id = "i2s1-in-sel-gpio2";
+       else
+               return ERR_PTR(-ENOENT);
+
+       desc = of_get_named_gpiod_flags(np, legacy_id, 0, of_flags);
+       if (!gpiod_not_found(desc))
+               pr_info("%s is using legacy gpio name '%s' instead of '%s-gpios'\n",
+                       of_node_full_name(np), legacy_id, con_id);
+
+       return desc;
+}
+
 typedef struct gpio_desc *(*of_find_gpio_quirk)(struct device_node *np,
                                                const char *con_id,
                                                unsigned int idx,
@@ -498,6 +530,7 @@ static const of_find_gpio_quirk of_find_gpio_quirks[] = {
        of_find_regulator_gpio,
        of_find_arizona_gpio,
        of_find_usb_gpio,
+       of_find_mt2701_gpio,
        NULL
 };