[alsa-devel] [PATCH 3/3] ASoC: simple-card: add support for clock divider setup

[Daniel Mack]

On Tuesday, May 29, 2018 01:35 PM, Mark Brown wrote:
> On Mon, May 28, 2018 at 09:35:03PM +0200, Daniel Mack wrote:
>> Add support to call into snd_soc_dai_set_clkdiv() for both CPU and codec
>> DAIs from simple-card's hw_params().
> 
>> This allows platforms to set hardware-specific values without providing an
>> own machine driver.
> 
> Why do we have anything that actually needs this?  The devices with a
> set_clkdiv() operation are pretty legacy at this point and most of them
> should just be figuring out the dividers for themselves anyway.

The PXA platform CPU DAI still has it, and grepping also reveals some 
Freescale and Samsung platforms.

If that's considered legacy, we shouldn't add bindings for it of course. 
I can look into the PXA driver and see if it can auto-detect the 
dividers itself. It won't be straight forward though as the clocking 
setup also depends on configurations such as TDM slots, external vs. 
internal clocks etc. Meh.


Thanks,
Daniel