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Message-ID: <20111211193625.GE31337@atomide.com>
Date: Sun, 11 Dec 2011 11:36:25 -0800
From: Tony Lindgren <tony@...mide.com>
To: Linus Walleij <linus.walleij@...aro.org>
Cc: Stephen Warren <swarren@...dia.com>, linux-kernel@...r.kernel.org,
linux-arm-kernel@...ts.infradead.org, linux-tegra@...r.kernel.org
Subject: Re: [RFC 1/3] pinctrl: add a driver for NVIDIA Tegra
* Linus Walleij <linus.walleij@...aro.org> [111209 15:17]:
> On Fri, Dec 9, 2011 at 6:07 PM, Tony Lindgren <tony@...mide.com> wrote:
>
> > - We currently have hard time supporting pin groups with pins
> > coming from multiple pinmux driver instances
>
> Pin groups are per definiton per-controller inctance. That is a
> given side effect of not having a global pin space.
>
> But you can create two groups of the same name on two
> pin controllers so that e.g. pinctrl.0 and pinctrl.1 have
> a group named "foo", then map both to a certain device
> in the board pinmux map.
>
> You will have to request them individually however, like
> with two hogs or two pinmux_get() calls specifying the
> name of each map, else you will just get the first one.
>
> Not that I've tried it, but that's how it's supposed to work...
Yes a little bit of trickery is needed there, I'll look into
it more as we already have two controller instances on omap4.
Regards,
Tony
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