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Date: Wed, 15 Jul 2020 18:18:38 +0200 From: Arnaud Ferraris <arnaud.ferraris@...labora.com> To: Mark Brown <broonie@...nel.org>, Nicolin Chen <nicoleotsuka@...il.com> Cc: alsa-devel@...a-project.org, Timur Tabi <timur@...nel.org>, Xiubo Li <Xiubo.Lee@...il.com>, linux-kernel@...r.kernel.org, Takashi Iwai <tiwai@...e.com>, Liam Girdwood <lgirdwood@...il.com>, Rob Herring <robh+dt@...nel.org>, kernel@...labora.com, Fabio Estevam <festevam@...il.com> Subject: Re: [PATCH 0/4] ASoC: fsl_asrc: allow selecting arbitrary clocks Hi, Le 15/07/2020 à 16:05, Mark Brown a écrit : > On Tue, Jul 14, 2020 at 01:50:50PM -0700, Nicolin Chen wrote: > Anything wrong with ASRC selecting SSI1 clock for both cases? The > driver calculates the divisors based on the given clock rate, so > the final internal rate should be the same. If there's a problem, > I feel that's a separate bug. Calculations are indeed good, but then the clock selection setting in the ASRCSR register would also use SSI1 as the input clock, which doesn't work in our case. >> On Tue, Jul 14, 2020 at 09:27:53PM +0100, Mark Brown wrote: > > If you've got two radios that both need to sync to some radio derived > frequency it gets a bit more entertaining. It was indeed a fun ride trying to make it work for all the use-cases we were targetting. > >> Yet, in case that we need to support such an edge case, what's >> a relatively common practice to allow system select the clock >> source now? > > Honestly for anything that fun it tends to be a custom machine driver. > A property would seem reasonable though. I think so, does my initial implementation of the properties look sensible to you? ("fsl,asrc-input-clock" & "fsl,asrc-output-clock") Regards, Arnaud
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