On Sat, 28 Sep 2013 16:27:19 +0200
Sebastian Hesselbarth [off-list ref] wrote:

Jean-Francois,

I can confirm the following for CuBox:

AU1_EXTCLK is connected to si5351 clkout 2. For the _current_
(v3.12-rc1) dove-cubox.dts that means that you'll have to exchange
the properties for &i2c0/si5351/clkout[12]. If you leave it the way
it is, clkout2 is not allowed to change the pll inside si5351 and
only try to get close to the requested clk rate by using output
dividers. Would be great if you can provide a corresponding patch
for v3.12 (no need to Cc stable).

Also, as you seem to push kirkwood-i2s DT forward, please get back
to clkout2 (<&si5351 2>) for the audio node as you did correctly in
the first place.

With above changes, SPDIF_EN, and forcing kirkwood-i2s to always use
extclk, I can play SPDIF audio with 44k1 and 48k. Other rates could
also work, but my audio equipment ignores anything else.

Sebastian,

Thanks for your change. I can now get audio at 44.1, 32 and 22.05 kHz
on HDMI with the external clock (via i2s, but s/pdif and other rates
should work too).

	[snip]

What I am wondering here is, why you want to use i2s at all? On CuBox,
HDMI transmitter is connected to both i2s and spdif. IIRC, for the
transmitter it makes no difference if you provide i2s or spdif audio,
_but_ what you are loosing for sure is pass-through, i.e. sending
compressed AC3 directly.

	[snip]

It seems that my patch about adding s/pdif to the kirkwood audio driver
has not been accepted yet...

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