Re: [alsa-devel] [PATCH 4/4] ASoC: da7213: Improve 32KHz mode PLL locking

From	Mark Brown <broonie@kernel.org>
Newsgroups	linux.kernel
Subject	Re: [alsa-devel] [PATCH 4/4] ASoC: da7213: Improve 32KHz mode PLL locking
Date	2016-08-05 12:40 +0200
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On Fri, Aug 05, 2016 at 11:04:51AM +0200, Peter Meerwald-Stadler wrote:

> these registers cannot not found in the datasheet;
> maybe add descriptive #defines in da7213.h

> > +			snd_soc_write(codec, 0xF0, 0x8B);
> > +			snd_soc_write(codec, 0xF2, 0x03);
> > +			snd_soc_write(codec, 0xF0, 0x00);

It is very common for chips to have undocumented write sequences that
make tweaks based on test registers that are deliberately not
documented.  This looks like such a case, I'd imagine that register 0xf0
is a test key and 0xf2 contains a value being tweaked.

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[PATCH 0/4] ASoC: da7213: Device clocking updates and fixes Adam Thomson <Adam.Thomson.Opensource@diasemi.com> - 2016-08-04 16:50 +0200
  [PATCH 2/4] ASoC: da7213: Improve driver efficiency with regards to  MCLK usage Adam Thomson <Adam.Thomson.Opensource@diasemi.com> - 2016-08-04 16:50 +0200
    Re: [alsa-devel] [PATCH 2/4] ASoC: da7213: Improve driver efficiency  with regards to MCLK usage Peter Meerwald-Stadler <pmeerw@pmeerw.net> - 2016-08-08 09:50 +0200
  [PATCH 4/4] ASoC: da7213: Improve 32KHz mode PLL locking Adam Thomson <Adam.Thomson.Opensource@diasemi.com> - 2016-08-04 16:50 +0200
    Re: [alsa-devel] [PATCH 4/4] ASoC: da7213: Improve 32KHz mode PLL  locking Peter Meerwald-Stadler <pmeerw@pmeerw.net> - 2016-08-05 11:10 +0200
      Re: [alsa-devel] [PATCH 4/4] ASoC: da7213: Improve 32KHz mode PLL  locking Mark Brown <broonie@kernel.org> - 2016-08-05 12:40 +0200

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