A-Team_Digital_Solutions/android_kernel_motorola_sm6375
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gpio: Make of_count_named_gpios() use new of_count_phandle_with_args()

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This patch replaces the horribly coded of_count_named_gpios() with a
call to of_count_phandle_with_args() which is far more efficient. This
also changes the return value of of_gpio_count() & of_gpio_named_count()
from 'unsigned int' to 'int' so that it can return an error code. All
the users of that function are fixed up to correctly handle a negative
return value.

v2: Split GPIO portion into a separate patch

Tested-by: Andreas Larsson <[email protected]>
Signed-off-by: Grant Likely <[email protected]>
Cc: Linus Walleij <[email protected]>
Cc: Rob Herring <[email protected]>
This commit is contained in:
Grant Likely 2013-02-12 17:48:37 +00:00
commit e80beb27d2
9 changed files with 41 additions and 71 deletions
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35
drivers/gpio/gpiolib-of.c
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@ -88,41 +88,6 @@ int of_get_named_gpio_flags(struct device_node *np, const char *propname,
}
EXPORT_SYMBOL(of_get_named_gpio_flags);
/**
* 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.
*
* 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.
*/
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, propname, "#gpio-cells",
cnt, NULL);
/* A hole in the gpios = <> counts anyway. */
if (ret < 0 && ret != -EEXIST)
break;
} while (++cnt);
return cnt;
}
EXPORT_SYMBOL(of_gpio_named_count);
/**
* of_gpio_simple_xlate - translate gpio_spec to the GPIO number and flags
* @gc: pointer to the gpio_chip structure