linux-kernel - Re: [PATCH] ASoC: wm8804: Allow control of master clock divider in PLL generation

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Message-ID: <20140117094819.GA2826@opensource.wolfsonmicro.com>
Date:	Fri, 17 Jan 2014 09:48:19 +0000
From:	Charles Keepax <ckeepax@...nsource.wolfsonmicro.com>
To:	Daniel Matuschek <daniel@...uschek.net>
Cc:	alsa-devel@...a-project.org, Dimitris.Papastamos@...fsonmicro.com,
	tiwai@...e.de, linux-kernel@...r.kernel.org,
	patches@...nsource.wolfsonmicro.com, lgirdwood@...il.com,
	perex@...ex.cz, broonie@...nel.org
Subject: Re: [PATCH] ASoC: wm8804: Allow control of master clock divider in
	PLL generation

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@...uschek.net>

Acked-by: Charles Keepax <ckeepax@...nsource.wolfsonmicro.com>


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

Thanks,
Charles
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