Re: [PATCH 4/8] minnowboard: Add base platform driver for the MinnowBoard

[Linus Walleij]

On Thu, Jul 4, 2013 at 6:26 PM, Mark Brown <broonie@xxxxxxxxxx> wrote:
> On Thu, Jun 27, 2013 at 10:43:38PM -0700, Darren Hart wrote:
>
>> minnow_hwid() just returns an int that the minnowboard platform driver
>> read from the GPIO. This seems like a proper abstraction to me. Do you
>> object to this one as well?
>
> We should really have a subsystem for this too - the general idea idea
> of identifying boards, fit options and so on by looking at things like
> GPIOs or numbers in flash is really common.

Would it then be a bus following the pattern we chiseled out for
the soc bus? (Greg, Lee & Arnd architectured this.)

There we needed a struct device * on an overarching level to
tie in the sysfs entries reading out the SoC properties. But
it would be the same thing with in-kernel accessors for these
properties.

So it would be the same pattern above with a board bus, in
DT syntax:

board {
     soc {
     };
};

Yours,
Linus Walleij
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