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path: root/drivers/gpio/gpiolib-of.c
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Diffstat (limited to 'drivers/gpio/gpiolib-of.c')
-rw-r--r--drivers/gpio/gpiolib-of.c26
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,