Re: [RFC] About ARM expansion boards and others things

[Vladimir Pantelic <vladoman@gmail.com>]

Enric Balletbò i Serra wrote:
> Hi guys,
> I'm thinking probably in a crazy idea, I hope someone can help me or
> kill definitely this idea from my mind.
>
> I'll explain a little more, the real problem is I don't know how to
> add support for an expansion board for IGEP v2 board. I see most of
> boards adds the support inside the board-xxxxx.c file, for example if
> the expansion board has a Touchscreen interface using ADS7846/TSC2046
> they register ads7846 platform data in board-xxxx.c file. This is ok
> beacause the ads7846 can be detected and if expansion board is not
> present  the detection fails, but maybe other devices in expansion
> board can't be detected (for example an I/O expansion). So which is
> the best form to do this ?
>
> I'm thinking in create a kernel module for the expansion board that
> add all the new features, the expansion board should come with a I2C
> E2PROM for board ID storage, so the idea is create an i2c driver that
> reads the E2PROM and if found the Board ID inits all the expansion
> board devices.

don't know if you are aware of that:

http://elinux.org/BeagleBoardPinMux#Expansion_boards

also beagle.c board file has support for some expansion boards
already, maybe there is some code to be shared.

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