diff options
| author | Dmitry Torokhov <dmitry.torokhov@gmail.com> | 2022-10-18 08:41:11 +0300 |
|---|---|---|
| committer | Bartosz Golaszewski <bartosz.golaszewski@linaro.org> | 2022-10-20 14:57:54 +0300 |
| commit | 99d18d42c942854a073191714a311dc2420ec7d3 (patch) | |
| tree | 0c25f4a36a7f635f0fd77955335332b2b6825b78 /drivers/gpio/gpiolib-of.c | |
| parent | b02c85c9458cdd15e2c43413d7d2541a468cde57 (diff) | |
| download | linux-99d18d42c942854a073191714a311dc2420ec7d3.tar.xz | |
gpiolib: of: add a quirk for reset line polarity for Himax LCDs
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>
Diffstat (limited to 'drivers/gpio/gpiolib-of.c')
| -rw-r--r-- | drivers/gpio/gpiolib-of.c | 36 |
1 files changed, 36 insertions, 0 deletions
diff --git a/drivers/gpio/gpiolib-of.c b/drivers/gpio/gpiolib-of.c index c2a55ffb2b20..52616848a37c 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. |