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gpio: Add the devm_fwnode_get_index_gpiod_from_child() helper

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devm_fwnode_get_gpiod_from_child() currently allows GPIO users to
request a GPIO that is defined in a child fwnode instead of directly in
the device fwnode.
Extend this API by adding the devm_fwnode_get_index_gpiod_from_child()
helper which does the same except you can also specify an index in case
the 'xx-gpios' property describe several GPIOs.

Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
This commit is contained in:
Boris Brezillon 2017-02-02 14:53:11 +01:00 • committed by Linus Walleij
parent 4b0947974e
commit 537b94dafc
3 changed files with 37 additions and 23 deletions
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31
include/linux/gpio/consumer.h
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@ -135,14 +135,14 @@ int desc_to_gpio(const struct gpio_desc *desc);
struct fwnode_handle;
struct gpio_desc *fwnode_get_named_gpiod(struct fwnode_handle *fwnode,
const char *propname,
const char *propname, int index,
enum gpiod_flags dflags,
const char *label);
struct gpio_desc *devm_fwnode_get_gpiod_from_child(struct device *dev,
const char *con_id,
struct fwnode_handle *child,
enum gpiod_flags flags,
const char *label);
struct gpio_desc *devm_fwnode_get_index_gpiod_from_child(struct device *dev,
const char *con_id, int index,
struct fwnode_handle *child,
enum gpiod_flags flags,
const char *label);
#else /* CONFIG_GPIOLIB */
static inline int gpiod_count(struct device *dev, const char *con_id)
@ -417,13 +417,25 @@ struct fwnode_handle;
static inline
struct gpio_desc *fwnode_get_named_gpiod(struct fwnode_handle *fwnode,
const char *propname,
const char *propname, int index,
enum gpiod_flags dflags,
const char *label)
{
return ERR_PTR(-ENOSYS);
}
static inline
struct gpio_desc *devm_fwnode_get_index_gpiod_from_child(struct device *dev,
const char *con_id, int index,
struct fwnode_handle *child,
enum gpiod_flags flags,
const char *label)
{
return ERR_PTR(-ENOSYS);
}
#endif /* CONFIG_GPIOLIB */
static inline
struct gpio_desc *devm_fwnode_get_gpiod_from_child(struct device *dev,
const char *con_id,
@ -431,11 +443,10 @@ struct gpio_desc *devm_fwnode_get_gpiod_from_child(struct device *dev,
enum gpiod_flags flags,
const char *label)
{
return ERR_PTR(-ENOSYS);
return devm_fwnode_get_index_gpiod_from_child(dev, con_id, 0, child,
flags, label);
}
#endif /* CONFIG_GPIOLIB */
#if IS_ENABLED(CONFIG_GPIOLIB) && IS_ENABLED(CONFIG_GPIO_SYSFS)
int gpiod_export(struct gpio_desc *desc, bool direction_may_change);