[alsa-devel] [PATCH] clk: x86: Add Atom PMC platform clocks

[Pierre-Louis Bossart]

On 8/31/16 12:08 PM, Mark Brown wrote:
> On Tue, Aug 30, 2016 at 08:35:55PM -0500, Pierre-Louis Bossart wrote:
>> On 8/30/16 7:37 PM, Stephen Boyd wrote:
>
>>> It's sad that this can't be compiled on any platform. Has there
>>> been any move towards making this into a regmap provider so that
>>> this clk driver can use cross platform regmap APIs instead? Or
>
>> it's not clear to me what cross-platform goals you are hinting at and what
>> the concern is. We can add more framework stuff and make the code more
>> elegant but at the end of the day we will write in a very limited set of
>> registers (2 for audio - on/off and 19.2/25MHz selection) and the use of
>> this functionality is restricted to Baytrail and Cherrytrail.
>
> If code can be compiled on a wide range of platforms then that means
> that it's much easier to get build coverage of the code.  This is
> helpful for anyone doing any kind of cross tree updates - things like
> updating APIs for example.  The fewer configurations they have to touch
> to get everything built the easier it is for them.

ok, we can add a dummy pmc_write/read for non atom platforms so that 
changes in the clock framework API can be handled without configuration.
Using regmap to hide the IPC requests to the PCM seems a bit 
over-engineered - we are talking about 2 registers per clock - and bring 
limited benefits.