[alsa-devel] [PATCH v2] ASoC: ti: omap-mcpdm: Add support for pdmclk clock handling

[Tony Lindgren]

Hi,

* Peter Ujfalusi <peter.ujfalusi at ti.com> [191025 13:05]:
> McPDM module receives it's functional clock from external source. This
> clock is the pdmclk provided by the twl6040 audio IC. If the clock is not
> available all register accesses to McPDM fails and the module is not
> operational.
> 
> this has been lurking in my next-wip branch for some time...
> It might not needed anymore as I have not heard about issues with McPDM for a
> while.
> 
> It was dropped back then because some core parts were not picked in time and
> this caused some issues, but can not find the exact reason

Yes it's a strange solution to clock the internal mcpdm module
externally :)

AFAIK it's now already handled properly by ti-sysc. We have a common
omap4-mcpdm.dtsi configure mcpdm clock forthe module, then ti-sysc
driver defers probe until the mcpdm clock is available. And for omap5
we have omap5-board-common.dtsi configure it.

So probably the only thing omap-mcpdm.c driver needs to do is to
call PM runtime functions, maybe it's already doing that.

Regards,

Tony