Excluding pins from Linux control

Hi,

on BCM2835 (Raspberry Pi) the firmware on the VideoCore and Linux on the ARM core share a common pin "space". Depending on the board revision the VideoCore needs to controls some pins, which shouldn't be claimed by Linux on the ARM.

What is the right way to exclude control on Linux for those pins in order to avoid possible harmful operations?

I tought of this [1] but only for pins.

[1] - http://lxr.free-electrons.com/source/Documentation/devicetree/bindings/reserved-memory/reserved-memory.txt

Regards
Stefan
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