Messages in this thread | | | Subject | Re: [alsa-devel] [PATCH 4/4] ASoC: simple-card: Support for selecting system clocks by ID | From | Tero Kristo <> | Date | Fri, 22 Apr 2016 15:08:43 +0300 |
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On 22/04/16 14:52, Peter Ujfalusi wrote: > On 04/22/16 01:29, Stephen Boyd wrote: >>>> The first issue with converting the McASP to use CCF internally for clock >>>> selection, muxing and rate configuration is that the daVinci platform does not >>>> use CCF at all. Given that the davinci-mcasp driver is used by daVinci, we >>>> need to have non CCF way supported in ASoC... >>> >>> Well, at least long term we do need daVinci converting to CCF - this is >>> going to continue to cause problems, devices not part of the SoC can and >>> do contain clocks and are going to end up being supported via the clock >>> API. >> >> Does anyone here know what's involved in converting daVinci to >> CCF? It doesn't look too far off from what is in the CCF today, >> so I'm not sure what's blocking the transition. > > Not entirely sure, but most likely new clk driver(s) for daVinci under > drivers/clk/ti/ new set of structures to describe the clocks if the ti_clk* is > not applicable I guess for starter. Support for DT, non DT boots as most of > daVinci is not booting with DT and most likely never will. > It might help to have different daVinci boards for testing the transition. I > only have OMAP-L138-evm. I don't think it is enough for testing an entire > architecture for this big change... > > Tero might have better estimates on what is involved when switching an > architecture to CCF from custom, but at least synchronized API - so we don't > need to convert drivers at least. >
Davinci is currently a mutant architecture, it is overriding the common clk APIs and using its own. Converting these to CCF may open a can of worms in many ways.
All the clock data should be converted to support CCF, (from arch/arm/mach-davinci/), along with whatever Peter said.
This also in a situation where many/most upstream people don't even have davinci devices... Personally I have a grand total of zero davinci boards on my desk so at least I am unable to work on this right now.
-Tero
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