linux-kernel - Re: [PATCH v2 3/3] gpio: Support gpio nexus dt bindings

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Message-ID: <CACRpkdbU4hjZvK0tOETJe34F1zJ9TBRB4wR9_C+CbHJCJa7s0A@mail.gmail.com>
Date:   Thu, 19 Jan 2017 10:02:08 +0100
From:   Linus Walleij <linus.walleij@...aro.org>
To:     Stephen Boyd <stephen.boyd@...aro.org>
Cc:     Rob Herring <robh+dt@...nel.org>,
        Frank Rowand <frowand.list@...il.com>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-gpio@...r.kernel.org" <linux-gpio@...r.kernel.org>,
        Pantelis Antoniou <pantelis.antoniou@...sulko.com>,
        Mark Brown <broonie@...nel.org>
Subject: Re: [PATCH v2 3/3] gpio: Support gpio nexus dt bindings

On Wed, Jan 18, 2017 at 1:50 AM, Stephen Boyd <stephen.boyd@...aro.org> wrote:

> Platforms like 96boards have a standardized connector/expansion
> slot that exposes signals like GPIOs to expansion boards in an
> SoC agnostic way. We'd like the DT overlays for the expansion
> boards to be written once without knowledge of the SoC on the
> other side of the connector. This avoids the unscalable
> combinatorial explosion of a different DT overlay for each
> expansion board and SoC pair.
>
> Now that we have nexus support in the OF core let's change the
> function call here that parses the phandle lists of gpios to use
> the nexus variant. This allows us to remap phandles and their
> arguments through any number of nexus nodes and end up with the
> actual gpio provider being used.
>
> Cc: Pantelis Antoniou <pantelis.antoniou@...sulko.com>
> Cc: Linus Walleij <linus.walleij@...aro.org>
> Cc: Mark Brown <broonie@...nel.org>
> Signed-off-by: Stephen Boyd <stephen.boyd@...aro.org>

Acked-by: Linus Walleij <linus.walleij@...aro.org>

Provided that patches 1 & 2 go in reviewed and merged
by DT/device core people, they can merge this on top as well.

Yours,
Linus Walleij