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Are those buttons configurable in some way? Or do they have a fixed purpose? How does Android handle those buttons, BTW? > One question is if this should be handled inside the kernel. It will > make it compatible with existing software, but it will also reduce > flexibility. I would say that it should be described in device tree if the purpose is fixed. For example, if there is no display behind the touch screen at a certain point but a printed sheet (e.g., with a home or return symbol) then it is clear that this button is not going to change. In such a case I doubt that flexibility is required. Best regards, Michael > > Best regards, > Pavel