linux-kernel - Re: [PATCH v4 02/13] gpiolib: Introduce gpiochip_node

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Date:   Tue, 5 Apr 2022 14:13:08 +0200
From:   Bartosz Golaszewski <brgl@...ev.pl>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc:     Qianggui Song <qianggui.song@...ogic.com>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        Marc Zyngier <maz@...nel.org>,
        Fabien Dessenne <fabien.dessenne@...s.st.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        linux-amlogic@...ts.infradead.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        OpenBMC Maillist <openbmc@...ts.ozlabs.org>,
        Linux-Renesas <linux-renesas-soc@...r.kernel.org>,
        linux-samsung-soc@...r.kernel.org,
        linux-stm32@...md-mailman.stormreply.com,
        Neil Armstrong <narmstrong@...libre.com>,
        Kevin Hilman <khilman@...libre.com>,
        Jerome Brunet <jbrunet@...libre.com>,
        Martin Blumenstingl <martin.blumenstingl@...glemail.com>,
        Andrew Lunn <andrew@...n.ch>,
        Gregory Clement <gregory.clement@...tlin.com>,
        Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>,
        Avi Fishman <avifishman70@...il.com>,
        Tomer Maimon <tmaimon77@...il.com>,
        Tali Perry <tali.perry1@...il.com>,
        Patrick Venture <venture@...gle.com>,
        Nancy Yuen <yuenn@...gle.com>,
        Benjamin Fair <benjaminfair@...gle.com>,
        Tomasz Figa <tomasz.figa@...il.com>,
        Sylwester Nawrocki <s.nawrocki@...sung.com>,
        Alim Akhtar <alim.akhtar@...sung.com>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Alexandre Torgue <alexandre.torgue@...s.st.com>,
        Philipp Zabel <p.zabel@...gutronix.de>
Subject: Re: [PATCH v4 02/13] gpiolib: Introduce gpiochip_node_count() helper

On Fri, Apr 1, 2022 at 12:36 PM Andy Shevchenko
<andriy.shevchenko@...ux.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@...ux.intel.com>
> Reviewed-by: Geert Uytterhoeven <geert+renesas@...der.be>
> Tested-by: Geert Uytterhoeven <geert+renesas@...der.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@...ev.pl>