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

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Date:	Mon, 03 Sep 2012 10:09:34 -0500
From:	Rob Herring <robherring2@...il.com>
To:	Linus Walleij <linus.walleij@...aro.org>
CC:	Stephen Warren <swarren@...dia.com>,
	Lee Jones <lee.jones@...aro.org>,
	devicetree-discuss@...ts.ozlabs.org, linus.walleij@...ricsson.com,
	Wolfram Sang <w.sang@...gutronix.de>,
	linux-kernel@...r.kernel.org, linux-i2c@...r.kernel.org,
	STEricsson_nomadik_linux@...t.st.com,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 3/3] i2c: nomadik: Add Device Tree support to the Nomadik
 I2C driver

On 09/03/2012 09:35 AM, Linus Walleij wrote:
> On Mon, Sep 3, 2012 at 4:33 PM, Stephen Warren <swarren@...dia.com> wrote:
>> On 09/03/2012 05:58 AM, Linus Walleij wrote:
>>> 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.
>>
>> No, that's wrong. If platform data is specified, it overrides DT, so
>> that if the DT needs any fixup, it can be provided using platform data.
> 
> Thanks Stephen, now there are two of us saying this, Lee please
> follow this design pattern.
> 
> (Unless Rob/Grant start shouting counter-orders...)

Ideally, you only use DT or platform_data and you override DT with a new
DTB. Hopefully we can ultimately remove platform_data or all but parts
that can't be described in DT (i.e. function callouts).

But if you are handling both, then I agree that platform_data should
override DT.

Rob
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