Re: [PATCH 09/14] i2c: Add Device Tree support to the Nomadik I2Cdriver

[Lee Jones]

On 14/06/12 19:36, Mark Brown wrote:
> On Wed, Jun 13, 2012 at 01:28:17PM +0100, Lee Jones wrote:
>
> > Device Tree. However, we have just as much control by keeping them
> > in separate structs in the C file and selecting the right one using
> > the compatible sting.
>
> You're not understanding Linus' point.  The compatible string isn't
> useful here because properties like the maximum clock rate of the bus
> depend on the board design, not the silicon.  The controller may be
> perfectly happy to run at a given rate but other devices on the bus or
> the electrical engineering of the PCB itself may restrict this further.

And you're not understanding mine. ;)

You can have multiple compatible strings for a single driver. Which one 
you reference from the Device Tree will dictate which group of settings 
are used, including variation of clock rates.

--
Lee Jones
Linaro ST-Ericsson Landing Team Lead
M: +44 77 88 633 515
Linaro.org â Open source software for ARM SoCs
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