diff options
| author | Adam Ford <aford173@gmail.com> | 2020-04-11 20:33:51 -0500 |
|---|---|---|
| committer | Bartosz Golaszewski <bgolaszewski@baylibre.com> | 2020-04-15 13:20:00 +0200 |
| commit | ea06a482a47c41f5d04565dffbc21156bcfdd3e8 (patch) | |
| tree | df04b2ef46ce8ac5e4c32085ca2f54d09df1c2a8 /drivers/gpio/gpiolib-of.c | |
| parent | 616844408de7f21546c3c2a71ea7f8d364f45e0d (diff) | |
| download | lwn-ea06a482a47c41f5d04565dffbc21156bcfdd3e8.tar.gz lwn-ea06a482a47c41f5d04565dffbc21156bcfdd3e8.zip | |
gpiolib: of: improve gpiolib-of support of pull up/down on expanders
When using GPIO expanders attached to I2C ports, their set_config function
needs to be passed a config setting which contains options to enable pull
up or pull down bias feature. In order to set this config properly,
the gpio parser needs to handle GPIO_PULL_UP and GPIO_PULL_DOWN.
This patch enables the flags corresponding to GPIO_PULL_UP and
GPIO_PULL_DOWN.
Signed-off-by: Adam Ford <aford173@gmail.com>
Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
Diffstat (limited to 'drivers/gpio/gpiolib-of.c')
| -rw-r--r-- | drivers/gpio/gpiolib-of.c | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/drivers/gpio/gpiolib-of.c b/drivers/gpio/gpiolib-of.c index ccc449df3792..2c5dd1349f16 100644 --- a/drivers/gpio/gpiolib-of.c +++ b/drivers/gpio/gpiolib-of.c @@ -344,6 +344,12 @@ struct gpio_desc *gpiod_get_from_of_node(struct device_node *node, if (transitory) lflags |= GPIO_TRANSITORY; + if (flags & OF_GPIO_PULL_UP) + lflags |= GPIO_PULL_UP; + + if (flags & OF_GPIO_PULL_DOWN) + lflags |= GPIO_PULL_DOWN; + ret = gpiod_configure_flags(desc, propname, lflags, dflags); if (ret < 0) { gpiod_put(desc); @@ -585,6 +591,10 @@ static struct gpio_desc *of_parse_own_gpio(struct device_node *np, *lflags |= GPIO_ACTIVE_LOW; if (xlate_flags & OF_GPIO_TRANSITORY) *lflags |= GPIO_TRANSITORY; + if (xlate_flags & OF_GPIO_PULL_UP) + *lflags |= GPIO_PULL_UP; + if (xlate_flags & OF_GPIO_PULL_DOWN) + *lflags |= GPIO_PULL_DOWN; if (of_property_read_bool(np, "input")) *dflags |= GPIOD_IN; |