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Groups > linux.kernel > #1394069
| From | Arnaud Pouliquen <arnaud.pouliquen@st.com> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | Re: [PATCH 09/18] ASoC: sti: Update DT example to match the driver code |
| Date | 2016-05-04 10:00 +0200 |
| Message-ID | <ruZSW-8fm-5@gated-at.bofh.it> (permalink) |
| References | <rqkEG-8dU-7@gated-at.bofh.it> <rs8SK-6cK-7@gated-at.bofh.it> <rs9c6-6Eu-9@gated-at.bofh.it> <rs9F8-6Su-7@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
hello Arnd, peter, On 04/26/2016 01:44 PM, Arnd Bergmann wrote: > On Tuesday 26 April 2016 12:15:32 Peter Griffin wrote: >>> >>>> If not what would you recommend instead? >>> >>> It's still not clear to me what that bit in the syscfg register >>> is for. Given the error message about "sti-audio-clk-glue", >>> I suspect that this is actually a clock controller and that >>> it should be using the clock binding with a separate driver >>> instead of manipulating the regmap directly from the audio driver. >> >> Luckily I do have the datasheet for the audio-glue sysconf register. >> >> It says: - >> >> [11:8] PCM_CLK_SEL: Selects the frequency synthesizer clock or the external >> PCM clock for each channel. >> >> The driver only ever sets this to 1 which selects the frequency synthesizer >> clock. So the bitfield of the register which the driver is using (PCM_CLK_SEL) >> is a clock mux. > > Ok, that sounds like it could be either a really simple clock driver > with just a few lines, or integrated into an existing clock driver > if you already have one for this syscon node. > > Arnd > FYI, Name of this glue is related to the register name. But it does not concern only clock... This glue register is used to : - select clock source ( clock framework or external clock from GPIO) => one bit field per IP instance (player->clk_sel) - select uniperiph player IP instance for PCM out. (http://www.spinics.net/lists/alsa-devel/msg49034.html) Regards Arnaud
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Re: [PATCH 09/18] ASoC: sti: Update DT example to match the driver code Arnaud Pouliquen <arnaud.pouliquen@st.com> - 2016-05-04 10:00 +0200 Re: [PATCH 09/18] ASoC: sti: Update DT example to match the driver code Arnd Bergmann <arnd@arndb.de> - 2016-05-04 11:10 +0200
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