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

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Date:	Mon, 3 Sep 2012 16:20:16 +0100
From:	Lee Jones <lee.jones@...aro.org>
To:	Rob Herring <robherring2@...il.com>
Cc:	Linus Walleij <linus.walleij@...aro.org>,
	Stephen Warren <swarren@...dia.com>,
	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 Mon, Sep 03, 2012 at 10:09:34AM -0500, Rob Herring wrote:
> 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).

Exactly. I don't believe that AUX_DATA() should be used as a facility to
override DT settings from platform_data.

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

I do agree with this, but I haven't stumbled over such a use-case yet.
I have only provided; clock names, DMA settings and call-back information
via AUX_DATA() thus far, and those are being removed too when a) the 
correct bindings are mainlined and b) I have the time.

-- 
Lee Jones
Linaro ST-Ericsson Landing Team Lead
Linaro.org │ Open source software for ARM SoCs
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