gpiolib: of: support bias pull disable

On top of looking at PULL_UP and PULL_DOWN flags, also look at PULL_DISABLE and set the appropriate GPIO flag. The GPIO core will then pass down this to controllers that support it. Change-Id: I4ea291dbd4165f5744cc0677a7d20dfed3fa1f3b Signed-off-by: Nuno Sá <[email protected]> Reviewed-by: Linus Walleij <[email protected]> Signed-off-by: Bartosz Golaszewski <[email protected]> Signed-off-by: Amelie Delaunay <[email protected]> Reviewed-on: https://gerrit.st.com/c/mpu/oe/st/linux-stm32/+/312114 Tested-by: Eric FOURMONT <[email protected]> Reviewed-by: Eric FOURMONT <[email protected]> Domain-Review: Eric FOURMONT <[email protected]>
STMicroelectronics · Jul 31, 2023 · 1a3de8e · 1a3de8e
1 parent 7524535
commit 1a3de8e
Show file tree

Hide file tree

Showing 2 changed files with 8 additions and 0 deletions.
diff --git a/drivers/gpio/gpiolib-of.c b/drivers/gpio/gpiolib-of.c
@@ -354,6 +354,9 @@ struct gpio_desc *gpiod_get_from_of_node(const struct device_node *node,
 	if (flags & OF_GPIO_PULL_DOWN)
 		lflags |= GPIO_PULL_DOWN;
 
+	if (flags & OF_GPIO_PULL_DISABLE)
+		lflags |= GPIO_PULL_DISABLE;
+
 	ret = gpiod_configure_flags(desc, propname, lflags, dflags);
 	if (ret < 0) {
 		gpiod_put(desc);
@@ -556,6 +559,8 @@ struct gpio_desc *of_find_gpio(struct device *dev, const char *con_id,
 		*flags |= GPIO_PULL_UP;
 	if (of_flags & OF_GPIO_PULL_DOWN)
 		*flags |= GPIO_PULL_DOWN;
+	if (of_flags & OF_GPIO_PULL_DISABLE)
+		*flags |= GPIO_PULL_DISABLE;
 
 	return desc;
 }
@@ -621,6 +626,8 @@ static struct gpio_desc *of_parse_own_gpio(struct device_node *np,
 		*lflags |= GPIO_PULL_UP;
 	if (xlate_flags & OF_GPIO_PULL_DOWN)
 		*lflags |= GPIO_PULL_DOWN;
+	if (xlate_flags & OF_GPIO_PULL_DISABLE)
+		*lflags |= GPIO_PULL_DISABLE;
 
 	if (of_property_read_bool(np, "input"))
 		*dflags |= GPIOD_IN;

diff --git a/include/linux/of_gpio.h b/include/linux/of_gpio.h
@@ -29,6 +29,7 @@ enum of_gpio_flags {
 	OF_GPIO_TRANSITORY = 0x8,
 	OF_GPIO_PULL_UP = 0x10,
 	OF_GPIO_PULL_DOWN = 0x20,
+	OF_GPIO_PULL_DISABLE = 0x40,
 };
 
 #ifdef CONFIG_OF_GPIO