diff options
| author | Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com> | 2012-02-02 16:20:01 +0100 |
|---|---|---|
| committer | Grant Likely <grant.likely@secretlab.ca> | 2012-02-05 23:08:30 -0700 |
| commit | ff64abefb6680dfc2aca7ecaa5e695949e7335c9 (patch) | |
| tree | 8e580bc26cb65edf3135b25e29ddf8f77d776569 /include/linux/of_gpio.h | |
| parent | 9467d298e92455e6fd411d7ef1f367ced940587c (diff) | |
| download | lwn-ff64abefb6680dfc2aca7ecaa5e695949e7335c9.tar.gz lwn-ff64abefb6680dfc2aca7ecaa5e695949e7335c9.zip | |
of_gpio: add support of of_gpio_named_count to be able to count named gpio
Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
Cc: devicetree-discuss@lists.ozlabs.org
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
Diffstat (limited to 'include/linux/of_gpio.h')
| -rw-r--r-- | include/linux/of_gpio.h | 27 |
1 files changed, 25 insertions, 2 deletions
diff --git a/include/linux/of_gpio.h b/include/linux/of_gpio.h index b254052a49d7..81733d12cbea 100644 --- a/include/linux/of_gpio.h +++ b/include/linux/of_gpio.h @@ -50,7 +50,8 @@ static inline struct of_mm_gpio_chip *to_of_mm_gpio_chip(struct gpio_chip *gc) extern int of_get_named_gpio_flags(struct device_node *np, const char *list_name, int index, enum of_gpio_flags *flags); -extern unsigned int of_gpio_count(struct device_node *np); +extern unsigned int of_gpio_named_count(struct device_node *np, + const char* propname); extern int of_mm_gpiochip_add(struct device_node *np, struct of_mm_gpio_chip *mm_gc); @@ -71,7 +72,8 @@ static inline int of_get_named_gpio_flags(struct device_node *np, return -ENOSYS; } -static inline unsigned int of_gpio_count(struct device_node *np) +static inline unsigned int of_gpio_named_count(struct device_node *np, + const char* propname) { return 0; } @@ -89,6 +91,27 @@ static inline void of_gpiochip_remove(struct gpio_chip *gc) { } #endif /* CONFIG_OF_GPIO */ /** + * of_gpio_count - Count GPIOs for a device + * @np: device node to count GPIOs for + * + * The function returns the count of GPIOs specified for a node. + * + * Note that the empty GPIO specifiers counts too. For example, + * + * gpios = <0 + * &pio1 1 2 + * 0 + * &pio2 3 4>; + * + * defines four GPIOs (so this function will return 4), two of which + * are not specified. + */ +static inline unsigned int of_gpio_count(struct device_node *np) +{ + return of_gpio_named_count(np, "gpios"); +} + +/** * of_get_gpio_flags() - Get a GPIO number and flags to use with GPIO API * @np: device node to get GPIO from * @index: index of the GPIO |