[PATCH AUTOSEL 6.1 01/26] gpiolib: of: add a quirk for legacy names in Mediatek mt2701-cs42448

Sasha Levin
2022-12-24T01:29:37Z

From: Dmitry Torokhov <dmitry.torokhov@gmail.com>

[ Upstream commit 326c3753a6358ffab607749ea0aa95d1d0ad79b0 ]

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>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/gpio/gpiolib-of.c | 33 +++++++++++++++++++++++++++++++++
1 file changed, 33 insertions(+)

diff --git a/drivers/gpio/gpiolib-of.c b/drivers/gpio/gpiolib-of.c
index 0e4e1291604d..cef4f6634125 100644
--- 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
};

--
2.35.1