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

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Date:	Wed, 5 Sep 2012 08:53:54 +0200
From:	Linus Walleij <linus.walleij@...aro.org>
To:	Lee Jones <lee.jones@...aro.org>
Cc:	Arnd Bergmann <arnd@...db.de>,
	Alessandro Rubini <rubini@...dd.com>,
	Russell King - ARM Linux <linux@....linux.org.uk>,
	linux-arm-kernel@...ts.infradead.org,
	Rob Herring <robherring2@...il.com>,
	Stephen Warren <swarren@...dia.com>,
	linus.walleij@...ricsson.com, linux-kernel@...r.kernel.org,
	Wolfram Sang <w.sang@...gutronix.de>,
	linux-i2c@...r.kernel.org, STEricsson_nomadik_linux@...t.st.com,
	devicetree-discuss@...ts.ozlabs.org
Subject: Re: [PATCH 3/3] i2c: nomadik: Add Device Tree support to the Nomadik
 I2C driver

On Wed, Sep 5, 2012 at 8:41 AM, Lee Jones <lee.jones@...aro.org> wrote:
> On Tue, Sep 04, 2012 at 07:27:10PM +0200, Linus Walleij wrote:
>> On Tue, Sep 4, 2012 at 4:28 PM, Arnd Bergmann <arnd@...db.de> wrote:
>>
>> > In this particular case, we don't have a single board file providing a
>> > struct nmk_i2c_controller definition for platform data, so the best way
>> > to handle this IMHO is to remove the header file with the platform
>> > data definition, and just encode the defaults in the driver.
>>
>> Alessandro Rubini is actively working on bridging this (and
>> other amba_device primecells) to PCI, that is the reason why it
>> was recently converted to an amba_device. How is he then supposed to
>> get the proper parameters into the driver? Note that the PCI ID
>> is no help at all since the parameters depend on what is connected
>> to the I2C bus, not on what it itself is connected to. Isn't platform data
>> used in such cases?
>
> So why can't Alessandro continue to use Platform Data in the normal way?

He probably can, this is not an argument about that, what I am worried
about is Arnd's suggestion to delete the platform data header if there
are potential users of it.

Yours,
Linus Walleij
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