linux-kernel - RE: [PATCH 06/10] arm/tegra: prepare pinmux code for multiple tegra variants

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Date:	Mon, 21 Nov 2011 09:24:38 -0800
From:	Stephen Warren <swarren@...dia.com>
To:	Peter De Schrijver <pdeschrijver@...dia.com>,
	Olof Johansson <olof@...om.net>
CC:	Grant Likely <grant.likely@...retlab.ca>,
	Rob Herring <rob.herring@...xeda.com>,
	Randy Dunlap <rdunlap@...otime.net>,
	Russell King <linux@....linux.org.uk>,
	Colin Cross <ccross@...roid.com>,
	"devicetree-discuss@...ts.ozlabs.org" 
	<devicetree-discuss@...ts.ozlabs.org>,
	"linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-tegra@...r.kernel.org" <linux-tegra@...r.kernel.org>
Subject: RE: [PATCH 06/10] arm/tegra: prepare pinmux code for multiple tegra
 variants

Peter De Schrijver wrote at Monday, November 21, 2011 7:29 AM:
> On Fri, Nov 18, 2011 at 10:41:16PM +0100, Olof Johansson wrote:
> > On Thu, Nov 17, 2011 at 06:19:20PM +0200, Peter De Schrijver wrote:
> > > This patch modifies the pinmux code to be useable for multiple tegra variants.
> > > Some tegra20 specific constants will be replaced by variables which will be
> > > initialized to the appropriate value at runtime.
...
> > > diff --git a/arch/arm/mach-tegra/board-harmony-pcie.c b/arch/arm/mach-tegra/board-harmony-pcie.c
...
> > > +#include <mach/pinmux-tegra20.h>
> >
> > Boards shouldn't have to include this. The idea is that you should only
> > have to do board code against the pinmux.h interface, which internally
> > abstracts it for tegra 20 vs tegra 30.
> 
> The pinmux naming is still SoC specific. Unless we move this to devicetree
> (which should be part of a different patchset), I don't see how we can solve
> this, except by renaming all the pingroups. That would cause a lot more
> changes though.

I believe that Peter's explanation makes sense.

BTW, re: the new pinmux API: I have a driver for both Tegra20 and Tegra30
now which should work for muxing. All the data is present for all the pin
configs too (tri-state, pull, ...) but we need to define the core pinctrl
API for this before I can expose that. Similarly, we need DT bindings for
all of this before we can make use of it; something I hope to start work
on in the near future.

-- 
nvpublic

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