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gpiolib: Introduce gpiochip_node_count() helper

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The gpiochip_node_count() helper iterates over the device child nodes that
have the "gpio-controller" property set. It returns the number of such nodes
under a given device.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Tested-by: Geert Uytterhoeven <geert+renesas@glider.be>
Acked-by: Bartosz Golaszewski <brgl@bgdev.pl>
This commit is contained in:
Andy Shevchenko 2022-04-01 13:35:53 +03:00
parent 85ebb1a6bd
commit 0b19dde90a
1 changed files with 11 additions and 0 deletions
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11
include/linux/gpio/driver.h
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@ -755,4 +755,15 @@ static inline void gpiochip_unlock_as_irq(struct gpio_chip *gc,
device_for_each_child_node(dev, child) \
if (!fwnode_property_present(child, "gpio-controller")) {} else
static inline unsigned int gpiochip_node_count(struct device *dev)
{
struct fwnode_handle *child;
unsigned int count = 0;
for_each_gpiochip_node(dev, child)
count++;
return count;
}
#endif /* __LINUX_GPIO_DRIVER_H */