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gpiolib: Introduce for_each_requested_gpio_in_range() macro

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Introduce for_each_requested_gpio_in_range() macro which helps
to iterate over requested GPIO in a range. There are already
potential users of it, which are going to be converted
by the following patches.

For most of them for_each_requested_gpio() shortcut has been added.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://lore.kernel.org/r/20200615150545.87964-2-andriy.shevchenko@linux.intel.com
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
This commit is contained in:
Andy Shevchenko 2020-06-15 18:05:41 +03:00 committed by Linus Walleij
parent b3a9e3b962
commit b3337eb248
1 changed files with 16 additions and 0 deletions
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16
include/linux/gpio/driver.h
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@ -474,6 +474,22 @@ struct gpio_chip {
extern const char *gpiochip_is_requested(struct gpio_chip *gc,
unsigned int offset);
/**
* for_each_requested_gpio_in_range - iterates over requested GPIOs in a given range
* @chip: the chip to query
* @i: loop variable
* @base: first GPIO in the range
* @size: amount of GPIOs to check starting from @base
* @label: label of current GPIO
*/
#define for_each_requested_gpio_in_range(chip, i, base, size, label) \
for (i = 0; i < size; i++) \
if ((label = gpiochip_is_requested(chip, base + i)) == NULL) {} else
/* Iterates over all requested GPIO of the given @chip */
#define for_each_requested_gpio(chip, i, label) \
for_each_requested_gpio_in_range(chip, i, 0, chip->ngpio, label)
/* add/remove chips */
extern int gpiochip_add_data_with_key(struct gpio_chip *gc, void *data,
struct lock_class_key *lock_key,