diff options
| author | Laurent Pinchart <laurent.pinchart@ideasonboard.com> | 2015-10-13 00:20:21 +0300 |
|---|---|---|
| committer | Linus Walleij <linus.walleij@linaro.org> | 2015-10-16 22:49:26 +0200 |
| commit | 90b665f627b18822a7bbebeff44ce730ccf74275 (patch) | |
| tree | d57ba2c151df8e7b643d65ed2ebfc0c120b1274f | |
| parent | 923b93e451db876d1479d3e4458fce14fec31d1c (diff) | |
| download | linux-90b665f627b18822a7bbebeff44ce730ccf74275.tar.bz2 | |
gpiolib: Add and use OF_GPIO_SINGLE_ENDED flag
The flag matches the DT GPIO_SINGLE_ENDED flag and allows drivers to
parse and use the DT flag to handle single-ended (open-drain or
open-source) GPIOs.
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
| -rw-r--r-- | drivers/gpio/gpiolib.c | 20 | ||||
| -rw-r--r-- | include/linux/of_gpio.h | 1 |
2 files changed, 19 insertions, 2 deletions
diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c index 1615cc904702..6798355c61c6 100644 --- a/drivers/gpio/gpiolib.c +++ b/drivers/gpio/gpiolib.c @@ -1831,6 +1831,13 @@ static struct gpio_desc *of_find_gpio(struct device *dev, const char *con_id, if (of_flags & OF_GPIO_ACTIVE_LOW) *flags |= GPIO_ACTIVE_LOW; + if (of_flags & OF_GPIO_SINGLE_ENDED) { + if (of_flags & OF_GPIO_ACTIVE_LOW) + *flags |= GPIO_OPEN_DRAIN; + else + *flags |= GPIO_OPEN_SOURCE; + } + return desc; } @@ -2184,6 +2191,7 @@ struct gpio_desc *fwnode_get_named_gpiod(struct fwnode_handle *fwnode, { struct gpio_desc *desc = ERR_PTR(-ENODEV); bool active_low = false; + bool single_ended = false; int ret; if (!fwnode) @@ -2194,8 +2202,10 @@ struct gpio_desc *fwnode_get_named_gpiod(struct fwnode_handle *fwnode, desc = of_get_named_gpiod_flags(to_of_node(fwnode), propname, 0, &flags); - if (!IS_ERR(desc)) + if (!IS_ERR(desc)) { active_low = flags & OF_GPIO_ACTIVE_LOW; + single_ended = flags & OF_GPIO_SINGLE_ENDED; + } } else if (is_acpi_node(fwnode)) { struct acpi_gpio_info info; @@ -2208,10 +2218,16 @@ struct gpio_desc *fwnode_get_named_gpiod(struct fwnode_handle *fwnode, if (IS_ERR(desc)) return desc; - /* Only value flag can be set from both DT and ACPI is active_low */ if (active_low) set_bit(FLAG_ACTIVE_LOW, &desc->flags); + if (single_ended) { + if (active_low) + set_bit(FLAG_OPEN_DRAIN, &desc->flags); + else + set_bit(FLAG_OPEN_SOURCE, &desc->flags); + } + ret = gpiod_request(desc, NULL); if (ret) return ERR_PTR(ret); diff --git a/include/linux/of_gpio.h b/include/linux/of_gpio.h index f3191828f037..87d6d1632dd4 100644 --- a/include/linux/of_gpio.h +++ b/include/linux/of_gpio.h @@ -29,6 +29,7 @@ struct device_node; */ enum of_gpio_flags { OF_GPIO_ACTIVE_LOW = 0x1, + OF_GPIO_SINGLE_ENDED = 0x2, }; #ifdef CONFIG_OF_GPIO |