[PATCH 1/3] ARM: AT91: Add platform data for the ADCs

[Linus Walleij]

On Thu, Nov 3, 2011 at 5:27 PM, Maxime Ripard
<maxime.ripard at free-electrons.com> wrote:
> [Me]
>> We're not supposed to have platform data dependent to stuff in
>> staging under arch/arm or anyplace else in the main kernel tree.
>>
>> Please move this to
>> drivers/staging/iio/adc/at91adc-board.h
>> or so.
>
> Won't moving this part to staging prevent from using this structure in
> board files ? If so, how will I be able to declare a new board that is
> using this ADC (or add the support for the ADC to a new one) ?

Put this into a separate board file living under staging/iio/adc

Compare:
drivers/staging/ste_rmi4/board-mop500-u8500uib-rmi4.c

>> As for calling the at91_add_device_adc() function (which I guess
>> you want to do at some point) the pattern I followed for other
>> drivers is to declare a dummy function in arch/arm/mach-*
>> with __weak and let the staging driver override that. This way
>> the staging driver can go away without any compilation trouble
>> happening.
>
> I don't really see why my changes will break the compilation if the
> driver is no longer present in staging. At worst, the structure will be
> filled but used by no one, right ?

You're right.

But still, we cannot add that header file for a driver that
is in the staging tree. Header files go into the staging dir too.

Yours,
Linus Walleij