Arm sub architectures missing clk_round_rate()

From: Jonathan Cameron
Date: Sat Jun 08 2013 - 04:57:28 EST

At least one Arm subarch (pxa) does no provide an implementation of this
function. As far as I can see there is no way for a driver wishing to use
it to detect it's absence. This is marked in clk.h as being optional
for 'Machine Class support'. Obvious solutions to this are:

1) It is effectively only usable by platform specific drivers as no
more generic driver can know it is available. Perhaps even a stub that
returns an appropriate error would be acceptable.

2) It is not as optional as the header implies and should always be implemented
if the rest of the clk framework is.

3) There should be some means of detecting its absense so that drivers can
be dependant on its presene.

Which is the correct one?

This issue came up as a result of the thread
[PATCH RESEND V2 3/4] iio: frequency: adf4350: Add support for clock consumer framework
on linux-iio@xxxxxxxxxxxxxxx


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