Re: [PATCH 7/9] ARM: shmobile: APE6EVM: add MMCIF and SDHI DT nodes

[Arnd Bergmann <arnd@arndb.de>]

On Friday 21 June 2013, Guennadi Liakhovetski wrote:
> My preference still lies with specific per-feature driver bindings like in 
> my original implementation. Adding compatible strings to every driver for 
> every new SoC seems an absolute no-go to me. But with per-feature driver 
> bindings you would have exactly the same problem: if you later add support 
> for a new feature to the driver, and that feature is present on older 
> SoCs, the only way to enable it would be to replace the DT.

That is the main problem with the per-feature listing, but less of
a problem if you list both the original part and the specific name of
the new one in the compatible string.

It's also not an either-or thing. For a number of features, having
flags makes most sense, in particular when the feature is not
a property of the IP block but of the way it is connected to the
rest of the SoC.

	Arnd