[alsa-devel] [PATCH] ASoC: wm8804: Allow control of master clock divider in PLL generation

Charles Keepax ckeepax at opensource.wolfsonmicro.com
Fri Jan 17 10:48:19 CET 2014

On Tue, Jan 14, 2014 at 08:34:10PM +0100, Daniel Matuschek wrote:
> WM8804 can run with PLL frequencies of 256xfs and 128xfs for
> most sample rates. At 192kHz only 128xfs is supported. The
> existing driver selects 128xfs automatically for some lower
> samples rates. By using an additional mclk_div divider, it
> is now possible to control the behaviour. This allows using
> 256xfs PLL frequency on all sample rates up to 96kHz. It
> should allow lower jitter and better signal quality. The
> behavior has to be controlled by the sound card driver,
> because some sample frequency share the same setting. e.g.
> 192kHz and 96kHz use 24.576MHz master clock. The only
> difference is the MCLK divider.
> Signed-off-by: Daniel Matuschek <daniel at matuschek.net>

Acked-by: Charles Keepax <ckeepax at opensource.wolfsonmicro.com>

Sorry about the slight delay travelling with limited internet at
the mo.


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