linux-kernel - Re: [PATCH 3/3] i2c: nomadik: Add Device Tree support to the Nomadik I2C driver

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Message-ID: <CACRpkdZ5VFhrbONy=0K5MFh4e6BDFckq0yqzjQ2QkW9MgwKqBg@mail.gmail.com>
Date:	Mon, 3 Sep 2012 13:58:04 +0200
From:	Linus Walleij <linus.walleij@...aro.org>
To:	Lee Jones <lee.jones@...aro.org>,
	Rob Herring <rob.herring@...xeda.com>,
	devicetree-discuss@...ts.ozlabs.org,
	Stephen Warren <swarren@...dia.com>
Cc:	Wolfram Sang <w.sang@...gutronix.de>,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	STEricsson_nomadik_linux@...t.st.com, linus.walleij@...ricsson.com,
	arnd@...db.de, linux-i2c@...r.kernel.org
Subject: Re: [PATCH 3/3] i2c: nomadik: Add Device Tree support to the Nomadik
 I2C driver

On Mon, Sep 3, 2012 at 1:32 PM, Lee Jones <lee.jones@...aro.org> wrote:

> No, this is wrong. Platform data should not override DT.
>
> If DT is enabled and passed, it should have highest priority.

Oh is that so.

Rob: do we have a clear consensus on this? Then we should document
it in Documentation/devicetree/usage-model.txt.

(That document isn't part of the binding I believe, so we could define
Linux-specific behaviours in it.)

I always thought it was the other way around, that pdata took priority.

Usecase: hardcoded bootloader passer erroneous DT to a platform.
No way out. What to do? Override with pdata.

Yours,
Linus Walleij
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