5.15-stable review patch. If anyone has any objections, please let me know.
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From: Dmitry Torokhov dmitry.torokhov@gmail.com
[ Upstream commit 99d18d42c942854a073191714a311dc2420ec7d3 ]
Existing DTS that use legacy (non-standard) property name for the reset line "gpios-reset" also specify incorrect polarity (0 which maps to "active high"). Add a quirk to force polarity to "active low" so that once driver is converted to gpiod API that pays attention to line polarity it will work properly.
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 Stable-dep-of: f8d76c2c313c ("gpiolib: of: add polarity quirk for TSC2005") Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/gpio/gpiolib-of.c | 36 ++++++++++++++++++++++++++++++++++++ 1 file changed, 36 insertions(+)
diff --git a/drivers/gpio/gpiolib-of.c b/drivers/gpio/gpiolib-of.c index e9da0d5017c02..7a77d9cd9c774 100644 --- a/drivers/gpio/gpiolib-of.c +++ b/drivers/gpio/gpiolib-of.c @@ -152,11 +152,47 @@ static void of_gpio_quirk_polarity(const struct device_node *np, } }
+/* + * This quirk does static polarity overrides in cases where existing + * DTS specified incorrect polarity. + */ +static void of_gpio_try_fixup_polarity(const struct device_node *np, + const char *propname, + enum of_gpio_flags *flags) +{ + static const struct { + const char *compatible; + const char *propname; + bool active_high; + } gpios[] = { +#if !IS_ENABLED(CONFIG_LCD_HX8357) + /* + * Himax LCD controllers used incorrectly named + * "gpios-reset" property and also specified wrong + * polarity. + */ + { "himax,hx8357", "gpios-reset", false }, + { "himax,hx8369", "gpios-reset", false }, +#endif + }; + unsigned int i; + + for (i = 0; i < ARRAY_SIZE(gpios); i++) { + if (of_device_is_compatible(np, gpios[i].compatible) && + !strcmp(propname, gpios[i].propname)) { + of_gpio_quirk_polarity(np, gpios[i].active_high, flags); + break; + } + } +} + static void of_gpio_flags_quirks(const struct device_node *np, const char *propname, enum of_gpio_flags *flags, int index) { + of_gpio_try_fixup_polarity(np, propname, flags); + /* * Some GPIO fixed regulator quirks. * Note that active low is the default.