[alsa-devel] [PATCH 2/3] ASoC: simple-card: make sysclk index configurable

[Mark Brown]

On Tue, May 29, 2018 at 10:23:48PM +0200, Daniel Mack wrote:
> On Tuesday, May 29, 2018 01:24 PM, Mark Brown wrote:

> > If we want to get more complex usage of clocks in the DT we should be
> > moving the CODECs over to using the standard clock bindings for this
> > stuff rather than inventing custom ASoC clock bindings for it.  That way
> > we don't have to deal with the pain of trying to join things up in the
> > future.

> This will get rather complex too though, because most codec and cpu dais can
> act as clock source xor clock consumer, depending on how the hardware is
> built. Would you want to represent everything, bit clocks, frame clocks,
> master clocks etc as clock nodes?

We're probably OK just going down to the master clocks mostly I think.
For the clocks on the actual bus we can probably have helpers in the
core that generate the clocks and the drivers just tell the core the
rates.

> If that's the case, could you depict how the DT bindings should look like by
> example?

I've not been able to dig far enough into the clock bindings yet.
That's not super helpful for you I appreciate, TBH nobody seemed to
particularly need this so it wasn't super urgent - most of the things
using alternative clocks on devices seem to also need custom machine
drivers for other reasons.
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