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 07:41:07 +0100
From:	Lee Jones <lee.jones@...aro.org>
To:	Linus Walleij <linus.walleij@...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 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?

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