[PATCH 2/4] gpiolib: of: support bias pull disable

Nuno Sá
2022-07-13T13:13:58Z

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.

Signed-off-by: Nuno Sá <nuno.sa@analog.com>
---
drivers/gpio/gpiolib-of.c | 7 +++++++
include/linux/of_gpio.h | 1 +
2 files changed, 8 insertions(+)

diff --git a/drivers/gpio/gpiolib-of.c b/drivers/gpio/gpiolib-of.c
index f80307be37d5..a037b50bef33 100644
--- 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
index 8bf2ea859653..a5166eb93437 100644
--- 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
--
2.37.0