Re: [PATCH v3 09/16] gpiolib: Introduce gpiochip_irqchip_add_domain()

[Thomas Gleixner <tglx@xxxxxxxxxxxxx>]

Michael Walle <michael@xxxxxxxx> writes:
> This connects an IRQ domain to a gpiochip and reuses
> gpiochip_to_irq().

A little bit more context and explanation why this function is useful
would be appreciated.

> Signed-off-by: Michael Walle <michael@xxxxxxxx>
> ---
>  drivers/gpio/gpiolib.c      | 20 ++++++++++++++++++++
>  include/linux/gpio/driver.h |  3 +++
>  2 files changed, 23 insertions(+)
>
> diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
> index 40f2d7f69be2..7b3d7f496b9a 100644
> --- a/drivers/gpio/gpiolib.c
> +++ b/drivers/gpio/gpiolib.c
> @@ -2722,6 +2722,26 @@ int gpiochip_irqchip_add_key(struct gpio_chip *gc,
>  }
>  EXPORT_SYMBOL_GPL(gpiochip_irqchip_add_key);
>  
> +/**
> + * gpiochip_irqchip_add_key() - adds an irqdomain to a gpiochip

Copy & paste is wonderful

> + * @gc: the gpiochip to add the irqchip to
> + * @domain: the irqdomain to add to the gpiochip
> + *
> + * This function adds an IRQ domain to the gpiochip.
> + */
> +int gpiochip_irqchip_add_domain(struct gpio_chip *gc,
> +				struct irq_domain *domain)
> +{
> +	if (!domain)
> +		return -EINVAL;
> +
> +	gc->to_irq = gpiochip_to_irq;
> +	gc->irq.domain = domain;
> +
> +	return 0;
> +}

Thanks,

        tglx