linux-kernel - Re: [PATCH v3 09/16] gpiolib: Introduce gpiochip_irqchip_add

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Message-ID: <87mu6xqhny.fsf@nanos.tec.linutronix.de>
Date:   Mon, 27 Apr 2020 13:42:09 +0200
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Michael Walle <michael@...le.cc>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        linux-gpio@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-hwmon@...r.kernel.org,
        linux-pwm@...r.kernel.org, linux-watchdog@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org
Cc:     Linus Walleij <linus.walleij@...aro.org>,
        Bartosz Golaszewski <bgolaszewski@...libre.com>,
        Rob Herring <robh+dt@...nel.org>,
        Jean Delvare <jdelvare@...e.com>,
        Guenter Roeck <linux@...ck-us.net>,
        Lee Jones <lee.jones@...aro.org>,
        Thierry Reding <thierry.reding@...il.com>,
        Uwe Kleine-König 
        <u.kleine-koenig@...gutronix.de>,
        Wim Van Sebroeck <wim@...ux-watchdog.org>,
        Shawn Guo <shawnguo@...nel.org>, Li Yang <leoyang.li@....com>,
        Jason Cooper <jason@...edaemon.net>,
        Marc Zyngier <maz@...nel.org>, Mark Brown <broonie@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Michael Walle <michael@...le.cc>
Subject: Re: [PATCH v3 09/16] gpiolib: Introduce gpiochip_irqchip_add_domain()

Michael Walle <michael@...le.cc> 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@...le.cc>
> ---
>  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