[alsa-devel] [PATCH RFC 00/13] Adding SPDIF support to kirkwood-i2s

Mark Brown broonie at kernel.org
Mon Aug 5 16:07:29 CEST 2013

On Mon, Aug 05, 2013 at 03:06:16PM +0200, Sebastian Hesselbarth wrote:

> looking at e.g. nvidia,tegra-audio-*.txt bindings, I guess you are
> proposing to have a new binding for every SoC/codec/board combination?
> Also, you should have seen "ASoC: fsl: Add S/PDIF machine driver", which
> is - again - proposing a new binding for fsl with spdif "codec".

> You really want me to go the same way or is there any "other board
> binding" I should follow?

Yes, go that way.  There is the simple-card driver which should be able
to grow to consume most of these things for simple stereo CODECs, having
the common clock API more widely available so we can create a hard
requirement that clocks be described using the clock API would help a
lot with that.

> That will be one machine driver for possibly all Marvell boards, not
> what e.g. tegra is doing with one machine driver for each board they
> can find. I understand that the exact wiring on each board may get
> complicated, but I don't see why a (well thought) binding should not
> be able to describe it?

The clocking arrangements for a smartphone are not that trivial and we
need to be able to cope with things like having more than two devices on
the bus.
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