[alsa-devel] [PATCH v5 1/2] ASoC: fsl: Add S/PDIF CPU DAI driver

[Tomasz Figa]

On Saturday 17 of August 2013 16:53:16 Sascha Hauer wrote:
> On Sat, Aug 17, 2013 at 02:28:04PM +0200, Tomasz Figa wrote:
> > > > > Also I would make this option required. Use a dummy clock for
> > > > > mux
> > > > > inputs that are grounded for a specific SoC.
> > > > 
> > > > Some clocks are not from CCM and we haven't defined in
> > > > imx6q-clk.txt,
> > > > so in most cases we can't provide a phandle for them, eg:
> > > > spdif_ext.
> > > > I think it's a bit hard to force it to be 'required'. An
> > > > 'optional'
> > > > looks more flexible to me and a default one is ensured even if
> > > > it's
> > > > missing.
> > > 
> > > <&clks 0> is the dummy clock. This can be used for all input clocks
> > > not
> > > defined by the SoC.
> > 
> > Where does this assumption come from? Is it documented anywhere?
> 
> This is how all i.MX clock bindings currently are. See
> Documentation/devicetree/bindings/clock/imx*-clock.txt

OK, thanks.

I guess we need some discussion on dummy clocks vs skipped clocks. I think 
we want some consistency on this, don't we?

If we really need a dummy clock, then we might also want a generic way to 
specify it.

Best regards,
Tomasz