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

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Date:   Mon, 18 Jan 2021 14:11:51 -0800
From:   Saravana Kannan <saravanak@...gle.com>
To:     Linus Walleij <linus.walleij@...aro.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     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

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>
>
> "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.

-Saravana