[alsa-devel] [PATCH 1/6] ASoC: max98088: Document DT bindings

[Andreas Färber]

Am 19.02.2015 um 18:48 schrieb Doug Anderson:
> On Thu, Feb 19, 2015 at 6:13 AM, Andreas Färber <afaerber at suse.de> wrote:
>>> I see that a master clock (mclk) is added in patch 6/6 but the
>>> max98088 codec driver does handle this clock.
>>>
>>> If the SoC XCLKOUT provides the master clock to the max98089
>>> codec in Spring like is the case for the max9809{0,5} codecs
>>> in the Snow and Peach Pit/Pi Chromebooks then you need to do
>>> something along the lines of the following commits:
>>>
>>> e3048c3d2be5 ASoC: max98095: Add master clock handling
>>> b10ab7b838bd ASoC: max98090: Add master clock handling
>>>
>>> If that's the case you also have to mention in the DT binding
>>> doc that "clocks" and "clock-names" are optional properties
>>> like Documentation/devicetree/bindings/sound/max9809{0,5}.txt.
>>
>> When I prepared this patch, I believe it was a straight copy from
>> max98090. Sounds like they changed since then.
>>
>> My 6/6 adopted the mclk clock from your now-cancelled v2 patch for Snow,
>> assuming it would be the same on all Chromebooks. I tested that last
>> change by checking for errors in dmesg.
>>
>> Doug, can you advise on how the clock wiring is for Spring?
> 
> I can confirm that XCLKOUT is connected to the codec MCLK on the
> Spring schematics I have.

Thanks! I updated max98088 and had it working on first boot, but on
second boot it complained about the frequency:

[    7.896834] max98088 7-0010: revision A
[    7.912776] snow-audio sound: HiFi <-> 3830000.i2s mapping ok
[    7.919367] max98088 7-0010: Invalid master clock frequency
[    7.919429] snow-audio sound: ASoC: Spring-I2S-MAX98089 late_probe()
failed: -22
[    7.920019] snow-audio sound: snd_soc_register_card failed (-22)
[    7.920109] snow-audio: probe of sound failed with error -22

Will investigate.

Andreas

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