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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
parent 9467d298e9
commit ff64abefb6
2 changed files with 30 additions and 6 deletions
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9
drivers/of/gpio.c
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@@ -78,8 +78,9 @@ err0:
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
* @propname: property name containing gpio specifier(s)
*
* 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
* 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;
do {
int ret;
ret = of_parse_phandle_with_args(np, "gpios", "#gpio-cells",
ret = of_parse_phandle_with_args(np, propname, "#gpio-cells",
cnt, NULL);
/* A hole in the gpios = <> counts anyway. */
if (ret < 0 && ret != -EEXIST)
@@ -109,7 +110,7 @@ unsigned int of_gpio_count(struct device_node *np)
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