[alsa-devel] Kernel Device Tree entries for simple-audio-card

[Caleb Crome]

On Tue, Sep 29, 2015 at 11:41 AM, Rick Mann <rmann at latencyzero.com> wrote:
> Ugh, sorry. Here you go:
>
> https://github.com/JetForMe/podtique/blob/v1/bbb/cape/Podtique1/BB-ENABLE-PRU.dts
>
> Sent from my iPhone
>
> On Sep 29, 2015, at 07:08, Caleb Crome <caleb at crome.org> wrote:
>
> Now I have a working MCLK, and I see clocking on BCLK and WCLK, but the
> rates are questionable. MCLK is 24 MHz (even though in the DTS it's set to
> 12 MHz); that might be okay.

It's definitely not obvious why you'd be getting 24MHz instead of 12.
Wait.  Are you getting exactly 24 MHz, or about 24 MHz?  in
davinci-evm.c there are some .sysclk settings set to 24576000 as in
the da830_snd_soc_card_crvdata.

>
>
>   # speaker-test -r 22050 -c 2 -f 1000 -F S16_LE -t sine -s 1 -D hw:0,0
>
>
> WCLK is 11.88 kHz, and it is pulses (DSP mode), rather than high for left,
> low for right for each channel's word. BCLK is 379.5 kHz.

Sounds like you're not in I2S mode, you must be in DSP or
left-justified mode.  That's set in your eavinci-evm.c in the
snd_soc_dai_link structure under the field .dai_fmt.  Most of them are
set to SND_SOC_DAIFMT_DSP_B.

-Caleb