[PATCH 4/7] spi: pl022: attempt to get sspclk by name

On Wed, Feb 12, 2014 at 11:21:50AM +0000, Arnd Bergmann wrote:

On Wednesday 12 February 2014, Mark Rutland wrote:

quoted

To me it feels odd to require the last clock in the list (apb_pclk) to
be named, and the rest to be in a particular order. For the dt case it
seems saner to add new clocks with names as it allows arbitrary subsets
of clocks to be wired up and described (though obviously in this case a
missing sspclk would be problematic).

Yes, good point about the missing clocks, and I also agree mixing ordered
and named clocks in one device is rather odd and can lead to trouble.

I guess there isn't really a good way out here, and I certainly won't
ask for it to be done one way or the other if someone else has a 
good argument which way it should be implemented.

Having thought about it, all dts that for the ssp_pclk must have some
name for the sspclk (though the specific name is arbitrary). I could get
the driver to try each of those before falling back to the index
(perhaps with a helper that takes a list of known aliases), so all
existing dts (that we are aware of) would work with the clock requested
by name.

I assume that for the non-dt case it's possible to name clock inputs to
a device without the clock being associated with the name globally? If
so we could get rid of the index usage entirely in this case.

Does that sound workable?

Thanks,
Mark.