diff options
Diffstat (limited to 'drivers/gpio/gpiolib-of.c')
| -rw-r--r-- | drivers/gpio/gpiolib-of.c | 26 |
1 files changed, 24 insertions, 2 deletions
diff --git a/drivers/gpio/gpiolib-of.c b/drivers/gpio/gpiolib-of.c index 7f1260c78270..a6e1891217e2 100644 --- a/drivers/gpio/gpiolib-of.c +++ b/drivers/gpio/gpiolib-of.c @@ -1,4 +1,4 @@ -// SPDX-License-Identifier: GPL-2.0 +// SPDX-License-Identifier: GPL-2.0+ /* * OF helpers for the GPIO API * @@ -54,10 +54,32 @@ static struct gpio_desc *of_xlate_and_get_gpiod_flags(struct gpio_chip *chip, } static void of_gpio_flags_quirks(struct device_node *np, + const char *propname, enum of_gpio_flags *flags, int index) { /* + * Handle MMC "cd-inverted" and "wp-inverted" semantics. + */ + if (IS_ENABLED(CONFIG_MMC)) { + /* + * Active low is the default according to the + * SDHCI specification and the device tree + * bindings. However the code in the current + * kernel was written such that the phandle + * flags were always respected, and "cd-inverted" + * would invert the flag from the device phandle. + */ + if (!strcmp(propname, "cd-gpios")) { + if (of_property_read_bool(np, "cd-inverted")) + *flags ^= OF_GPIO_ACTIVE_LOW; + } + if (!strcmp(propname, "wp-gpios")) { + if (of_property_read_bool(np, "wp-inverted")) + *flags ^= OF_GPIO_ACTIVE_LOW; + } + } + /* * Some GPIO fixed regulator quirks. * Note that active low is the default. */ @@ -174,7 +196,7 @@ struct gpio_desc *of_get_named_gpiod_flags(struct device_node *np, goto out; if (flags) - of_gpio_flags_quirks(np, flags, index); + of_gpio_flags_quirks(np, propname, flags, index); pr_debug("%s: parsed '%s' property of node '%pOF[%d]' - status (%d)\n", __func__, propname, np, index, |