[PATCH v4 02/13] gpiolib: Introduce gpiochip_node_count() helper

[Bartosz Golaszewski]

On Fri, Apr 1, 2022 at 12:36 PM Andy Shevchenko
<andriy.shevchenko at linux.intel.com> wrote:
>
> 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 at linux.intel.com>
> Reviewed-by: Geert Uytterhoeven <geert+renesas at glider.be>
> Tested-by: Geert Uytterhoeven <geert+renesas at glider.be>
> ---
>  include/linux/gpio/driver.h | 11 +++++++++++
>  1 file changed, 11 insertions(+)
>
> diff --git a/include/linux/gpio/driver.h b/include/linux/gpio/driver.h
> index bfc91f122d5f..12de0b22b4ef 100644
> --- a/include/linux/gpio/driver.h
> +++ b/include/linux/gpio/driver.h
> @@ -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 */
> --
> 2.35.1
>

Acked-by: Bartosz Golaszewski <brgl at bgdev.pl>