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of: Create function for counting number of phandles in a property

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This patch creates of_count_phandle_with_args(), a new function for
counting the number of phandle+argument tuples in a given property. This
is better than the existing method of parsing each phandle individually
until parsing fails which is a horribly slow way to do the count.

Tested on ARM using the selftest code.

v3: - Rebased on top of selftest code cleanup patch
v2: - fix bug where of_parse_phandle_with_args() could behave like _count_.
    - made of_gpio_named_count() into a static inline regardless of CONFIG_OF_GPIO

Tested-by: Andreas Larsson <andreas@gaisler.com>
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
Cc: Linus Walleij <linus.walleij@linaro.org>
Cc: Rob Herring <rob.herring@calxeda.com>
This commit is contained in:
Grant Likely 2013-02-10 22:57:21 +00:00
parent 23ce04c073
commit bd69f73f2c
3 changed files with 61 additions and 4 deletions
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9
include/linux/of.h
View file

@ -277,6 +277,8 @@ extern struct device_node *of_parse_phandle(const struct device_node *np,
extern int of_parse_phandle_with_args(const struct device_node *np,
const char *list_name, const char *cells_name, int index,
struct of_phandle_args *out_args);
extern int of_count_phandle_with_args(const struct device_node *np,
const char *list_name, const char *cells_name);
extern void of_alias_scan(void * (*dt_alloc)(u64 size, u64 align));
extern int of_alias_get_id(struct device_node *np, const char *stem);
@ -467,6 +469,13 @@ static inline int of_parse_phandle_with_args(struct device_node *np,
return -ENOSYS;
}
static inline int of_count_phandle_with_args(struct device_node *np,
const char *list_name,
const char *cells_name)
{
return -ENOSYS;
}
static inline int of_alias_get_id(struct device_node *np, const char *stem)
{
return -ENOSYS;