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of_gpio: add support of of_gpio_named_count to be able to count named gpio

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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>
This commit is contained in:
Jean-Christophe PLAGNIOL-VILLARD 2012-02-02 16:20:01 +01:00 • committed by Grant Likely
commit ff64abefb6
2 changed files with 30 additions and 6 deletions
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9
drivers/of/gpio.c
View file

@ -78,8 +78,9 @@ err0:
EXPORT_SYMBOL(of_get_named_gpio_flags); EXPORT_SYMBOL(of_get_named_gpio_flags);
/** /**
* of_gpio_count - Count GPIOs for a device * of_gpio_named_count - Count GPIOs for a device
* @np: device node to count GPIOs for * @np: device node to count GPIOs for
* @propname: property name containing gpio specifier(s)
* *
* The function returns the count of GPIOs specified for a node. * The function returns the count of GPIOs specified for a node.
* *
@ -93,14 +94,14 @@ EXPORT_SYMBOL(of_get_named_gpio_flags);
* defines four GPIOs (so this function will return 4), two of which * defines four GPIOs (so this function will return 4), two of which
* are not specified. * are not specified.
*/ */
unsigned int of_gpio_count(struct device_node *np) unsigned int of_gpio_named_count(struct device_node *np, const char* propname)
{ {
unsigned int cnt = 0; unsigned int cnt = 0;
do { do {
int ret; int ret;
ret = of_parse_phandle_with_args(np, "gpios", "#gpio-cells", ret = of_parse_phandle_with_args(np, propname, "#gpio-cells",
cnt, NULL); cnt, NULL);
/* A hole in the gpios = <> counts anyway. */ /* A hole in the gpios = <> counts anyway. */
if (ret < 0 && ret != -EEXIST) if (ret < 0 && ret != -EEXIST)
@ -109,7 +110,7 @@ unsigned int of_gpio_count(struct device_node *np)
return cnt; return cnt;
} }
EXPORT_SYMBOL(of_gpio_count); EXPORT_SYMBOL(of_gpio_named_count);
/** /**
* of_gpio_simple_xlate - translate gpio_spec to the GPIO number and flags * of_gpio_simple_xlate - translate gpio_spec to the GPIO number and flags

27
include/linux/of_gpio.h
View file

@ -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, extern int of_get_named_gpio_flags(struct device_node *np,
const char *list_name, int index, enum of_gpio_flags *flags); 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, extern int of_mm_gpiochip_add(struct device_node *np,
struct of_mm_gpio_chip *mm_gc); 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; 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; return 0;
} }
@ -88,6 +90,27 @@ static inline void of_gpiochip_remove(struct gpio_chip *gc) { }
#endif /* CONFIG_OF_GPIO */ #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 * of_get_gpio_flags() - Get a GPIO number and flags to use with GPIO API
* @np: device node to get GPIO from * @np: device node to get GPIO from