linux-kernel - Re: [PATCH v1 4/9] gpiolib: Clear the gpio_device's fwnode initialized flag before adding

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Date:   Mon, 15 Aug 2022 11:57:29 +0200
From:   Bartosz Golaszewski <brgl@...ev.pl>
To:     Saravana Kannan <saravanak@...gle.com>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Frank Rowand <frowand.list@...il.com>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Magnus Damm <magnus.damm@...il.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Daniel Scally <djrscally@...il.com>,
        Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
        Sakari Ailus <sakari.ailus@...ux.intel.com>,
        Len Brown <lenb@...nel.org>, Abel Vesa <abel.vesa@...aro.org>,
        Alexander Stein <alexander.stein@...tq-group.com>,
        Tony Lindgren <tony@...mide.com>,
        Sudeep Holla <sudeep.holla@....com>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        John Stultz <jstultz@...gle.com>,
        Doug Anderson <dianders@...omium.org>,
        Guenter Roeck <linux@...ck-us.net>, kernel-team@...roid.com,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>,
        devicetree <devicetree@...r.kernel.org>,
        Linux-Renesas <linux-renesas-soc@...r.kernel.org>,
        ACPI Devel Maling List <linux-acpi@...r.kernel.org>
Subject: Re: [PATCH v1 4/9] gpiolib: Clear the gpio_device's fwnode
 initialized flag before adding

On Wed, Aug 10, 2022 at 8:00 AM Saravana Kannan <saravanak@...gle.com> wrote:
>
> Registering an irqdomain sets the flag for the fwnode. But having the
> flag set when a device is added is interpreted by fw_devlink to mean the
> device has already been initialized and will never probe. This prevents
> fw_devlink from creating device links with the gpio_device as a
> supplier. So, clear the flag before adding the device.
>
> Signed-off-by: Saravana Kannan <saravanak@...gle.com>
> ---
>  drivers/gpio/gpiolib.c | 6 ++++++
>  1 file changed, 6 insertions(+)
>
> diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
> index cc9c0a12259e..1d57d6f24632 100644
> --- a/drivers/gpio/gpiolib.c
> +++ b/drivers/gpio/gpiolib.c
> @@ -522,6 +522,12 @@ static int gpiochip_setup_dev(struct gpio_device *gdev)
>  {
>         int ret;
>
> +       /*
> +        * If fwnode doesn't belong to another device, it's safe to clear its
> +        * initialized flag.
> +        */
> +       if (!gdev->dev.fwnode->dev)
> +               fwnode_dev_initialized(gdev->dev.fwnode, false);
>         ret = gcdev_register(gdev, gpio_devt);
>         if (ret)
>                 return ret;
> --
> 2.37.1.559.g78731f0fdb-goog
>

Acked-by: Bartosz Golaszewski <brgl@...ev.pl>