linux-kernel - Re: [PATCH V2 2/3] pinctrl: allow concurrent gpio and mux function ownership of pins

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Message-ID: <CACRpkdYdSaNsrr34o2Cc4vS12ee9oY7FG0pxB92mefHZKwdEpA@mail.gmail.com>
Date:	Tue, 6 Mar 2012 11:03:23 +0100
From:	Linus Walleij <linus.walleij@...aro.org>
To:	Stephen Warren <swarren@...dia.com>
Cc:	Linus Walleij <linus.walleij@...ricsson.com>,
	Grant Likely <grant.likely@...retlab.ca>,
	Olof Johansson <olof@...om.net>,
	Colin Cross <ccross@...roid.com>,
	Russell King <linux@....linux.org.uk>,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-tegra@...r.kernel.org
Subject: Re: [PATCH V2 2/3] pinctrl: allow concurrent gpio and mux function
 ownership of pins

On Tue, Mar 6, 2012 at 1:22 AM, Stephen Warren <swarren@...dia.com> wrote:

> Per recent updates to Documentation/gpio.txt, gpiolib drivers should
> inform pinctrl when a GPIO is requested. pinctrl then marks that pin as
> in-use for that GPIO function.
>
> When an SoC muxes pins in a group, it's quite possible for the group to
> contain e.g. 6 pins, but only 4 of them actually be needed by the HW
> module that's mux'd to them. In this case, the other 2 pins could be
> used as GPIOs. However, pinctrl marks all the pins within the group as
> in-use by the selected mux function. To allow the expected gpiolib
> interaction, separate the concepts of pin ownership into two parts: One
> for the mux function and one for GPIO usage. Finally, allow those two
> ownerships to exist in parallel.
>
> Signed-off-by: Stephen Warren <swarren@...dia.com>

Good, and 100% in accordance with earlier discussions.
Acked-by: Linus Walleij <linus.walleij@...aro.org>

Thanks,
Linus Walleij
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