linux-kernel - Re: [PATCH v1] of: property: Add fw_devlink support for "gpio" and "gpios" binding

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Date:   Tue, 19 Jan 2021 09:50:05 +0100
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Saravana Kannan <saravanak@...gle.com>
Cc:     Linus Walleij <linus.walleij@...aro.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Rob Herring <robh+dt@...nel.org>,
        Frank Rowand <frowand.list@...il.com>,
        linux-tegra <linux-tegra@...r.kernel.org>,
        Bartosz Golaszewski <bgolaszewski@...libre.com>,
        Jon Hunter <jonathanh@...dia.com>,
        Android Kernel Team <kernel-team@...roid.com>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v1] of: property: Add fw_devlink support for "gpio" and
 "gpios" binding

Hi Saravana,

On Mon, Jan 18, 2021 at 11:14 PM Saravana Kannan <saravanak@...gle.com> wrote:
> On Mon, Jan 18, 2021 at 7:32 AM Linus Walleij <linus.walleij@...aro.org> wrote:
> > On Fri, Jan 15, 2021 at 10:02 PM Saravana Kannan <saravanak@...gle.com> wrote:
> > > To provide backward compatibility for boards that use deprecated DT
> > > bindings, we need to add fw_devlink support for "gpio" and "gpios".
> > >
> > > Cc: linux-tegra <linux-tegra@...r.kernel.org>
> > > Cc: Linus Walleij <linus.walleij@...aro.org>
> > > Cc: Bartosz Golaszewski <bgolaszewski@...libre.com>
> > > Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> > > Fixes: e590474768f1 ("driver core: Set fw_devlink=on by default")
> > > Tested-by: Jon Hunter <jonathanh@...dia.com>
> > > Signed-off-by: Saravana Kannan <saravanak@...gle.com>

Thanks for your patch!

> > "gpios" is a valid non legacy property I think.
>
> I checked :) Quoting the documentation [1]:
> "While a non-existent <name> is considered valid for compatibility
> reasons (resolving to the "gpios" property), it is not allowed for new
> bindings."
>
> [1] - https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/Documentation/devicetree/bindings/gpio/gpio.txt#n8
>
> > Anyways:
> > Reviewed-by: Linus Walleij <linus.walleij@...aro.org>
>
> Thanks!
>
> Greg/Rob,
>
> Can we pull this into driver-core-next please? It fixes issues on some
> boards with fw_devlink=on.

On r8a77951-salvator-xs.dts, it introduces one more failure:

    OF: /soc/i2c@...d8000/gpio@...pcie-sata-switch-hog: could not get
#gpio-cells for /cpus/cpu@102

Seems like it doesn't parse gpios properties in GPIO hogs correctly.

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds