[alsa-devel] [PATCH 0/7] ASoC: omap: Deprecate omap-pcm for sdma-pcm

[Peter Ujfalusi]

On 04/25/2018 07:56 PM, Tony Lindgren wrote:
> * Peter Ujfalusi <peter.ujfalusi at ti.com> [180425 16:06]:
>> On 04/25/2018 04:50 PM, Tony Lindgren wrote:
>>> * Jarkko Nikula <jarkko.nikula at bitmer.com> [180425 03:56]:
>>>> What I noticed some time ago on N810 but not time to fix it that OMAP mux
>>>> change dropped muxing audio McBSP pins. Those pins are muxed by reset or
>>>> bootloader to another function.
>>>>
>>>> Probably a few lines to arch/arm/boot/dts/omap2420-n810.dts etc.
>>>
>>> Hmm do you have a link or commit id to a patch that does the muxing
>>> to see which pins need to be muxed?
>>
>> FWIW I have this at the moment:
>> https://pastebin.com/WNT9wnD5
>>
>> I see that the card is there, but I'm fighting buildroot to have nfs
>> filesystem with aplay :o
>>
>> There are few things going to be needed to get things in a shape, like
>> converting the sound/soc/omap/n810.c to platform driver to be probed via DT.
>> Proper bindings for the card,
>> support for mclk handling in aic3x codec driver (n810 is hackinig that in the
>> machine driver)
>>
>> In theory audio _should_ work with the DT changes and the fixup in the n810.c...
>>
>> Should...
> 
> Cool. The pinctrl fixes at least make sense to me, that could be
> a separate patch maybe with Fixes: 5a87cde490e1 ("ARM: OMAP2+: Remove
> legacy booting support for n8x0") as pointed out by Jarkko.

The two GPIO for the headphone and speaker amp might also need pinctrl entry.

The clock sys_clkout2 reparenting and rate setting is done with the
assigned-clock stuff.

As I mentioned the only thing that we will need is the mclk handling in the
codec driver.

Most likely we could have a series dealing with DT only, then rewrite the n810.c.

The only thing might cause issue is that if the aic3x driver starts to handle
the sys_clkout2 (mclk) and the n810.c also wants to grab it and control it...
That might break along the way.

> 
> Regards,
> 
> Tony
> 


-- 
Péter

Texas Instruments Finland Oy, Porkkalankatu 22, 00180 Helsinki.
Y-tunnus/Business ID: 0615521-4. Kotipaikka/Domicile: Helsinki