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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>
This commit is contained in:
Laurent Pinchart 2015-10-13 00:20:21 +03:00 committed by Linus Walleij
parent 923b93e451
commit 90b665f627
2 changed files with 19 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

20
drivers/gpio/gpiolib.c
View File

@ -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);

1
include/linux/of_gpio.h
View File

@ -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