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

[Peter Ujfalusi]

On 2018-04-25 21:18, Peter Ujfalusi wrote:
> 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.

The sdma-pcm is working fine on omap2 as well, audio playback and
recording is working on n810 here.

> 
>>
>> Regards,
>>
>> Tony
>>
> 
> 

- Péter

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