linux-kernel - Re: [Patch v6 1/2] gpio: add GPIO hogging mechanism

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Message-ID: <CACRpkdYKuobhTJQ062+8srQ_nCZsnyuMbiM2gVp=u47Zi_jF6Q@mail.gmail.com>
Date:	Wed, 4 Mar 2015 11:09:53 +0100
From:	Linus Walleij <linus.walleij@...aro.org>
To:	Benoit Parrot <bparrot@...com>
Cc:	"linux-gpio@...r.kernel.org" <linux-gpio@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	Alexandre Courbot <gnurou@...il.com>,
	Maxime Ripard <maxime.ripard@...e-electrons.com>,
	Jiri Prchal <jiri.prchal@...ignal.cz>,
	Pantelis Antoniou <panto@...oniou-consulting.com>
Subject: Re: [Patch v6 1/2] gpio: add GPIO hogging mechanism

On Mon, Feb 2, 2015 at 6:44 PM, Benoit Parrot <bparrot@...com> wrote:

> Based on Boris Brezillion's work this is a reworked patch
> of his initial GPIO hogging mechanism.
> This patch provides a way to initially configure specific GPIO
> when the GPIO controller is probed.
>
> The actual DT scanning to collect the GPIO specific data is performed
> as part of gpiochip_add().
>
> The purpose of this is to allow specific GPIOs to be configured
> without any driver specific code.
> This is particularly useful because board design are getting
> increasingly complex and given SoC pins can now have more
> than 10 mux values, a lot of connections are now dependent on
> external IO muxes to switch various modes.
>
> Specific drivers should not necessarily need to be aware of
> what accounts to a specific board implementation. This board level
> "description" should be best kept as part of the dts file.
>
> Signed-off-by: Benoit Parrot <bparrot@...com>
> Reviewed-by: Alexandre Courbot <acourbot@...dia.com>

Patch applied.

Good to have this in place for Linux 4.1!

Yours,
Linus Walleij
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