diff options
Diffstat (limited to 'drivers/gpio/gpiolib-of.c')
| -rw-r--r-- | drivers/gpio/gpiolib-of.c | 41 |
1 files changed, 40 insertions, 1 deletions
diff --git a/drivers/gpio/gpiolib-of.c b/drivers/gpio/gpiolib-of.c index 7f1260c78270..fa8044228f0e 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 * @@ -58,6 +58,45 @@ static void of_gpio_flags_quirks(struct device_node *np, int index) { /* + * Handle MMC "cd-inverted" and "wp-inverted" semantics. + */ + if (IS_ENABLED(CONFIG_MMC)) { + if (of_property_read_bool(np, "cd-gpios")) { + if (of_property_read_bool(np, "cd-inverted")) { + if (*flags & OF_GPIO_ACTIVE_LOW) { + /* "cd-inverted" takes precedence */ + *flags &= ~OF_GPIO_ACTIVE_LOW; + pr_warn("%s GPIO handle specifies CD active low - ignored\n", + of_node_full_name(np)); + } + } else { + /* + * Active low is the default according to the + * SDHCI specification. If the GPIO handle + * specifies the same thing - good. + */ + *flags |= OF_GPIO_ACTIVE_LOW; + } + } + if (of_property_read_bool(np, "wp-gpios")) { + if (of_property_read_bool(np, "wp-inverted")) { + /* "wp-inverted" takes precedence */ + if (*flags & OF_GPIO_ACTIVE_LOW) { + *flags &= ~OF_GPIO_ACTIVE_LOW; + pr_warn("%s GPIO handle specifies WP active low - ignored\n", + of_node_full_name(np)); + } + } else { + /* + * Active low is the default according to the + * SDHCI specification. If the GPIO handle + * specifies the same thing - good. + */ + *flags |= OF_GPIO_ACTIVE_LOW; + } + } + } + /* * Some GPIO fixed regulator quirks. * Note that active low is the default. */ |