linux-kernel - Re: [PATCH] sound/soc/codecs/wm8978: add missing BCLK divider setup

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Message-ID: <ec917317-4240-47ff-bb9a-6f2fe9068c19@sirena.org.uk>
Date: Tue, 7 Oct 2025 14:48:01 +0100
From: Mark Brown <broonie@...nel.org>
To: Sune Brian <briansune@...il.com>
Cc: Charles Keepax <ckeepax@...nsource.cirrus.com>,
	Liam Girdwood <lgirdwood@...il.com>,
	Kuninori Morimoto <kuninori.morimoto.gx@...esas.com>,
	linux-sound@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] sound/soc/codecs/wm8978: add missing BCLK divider setup

On Tue, Oct 07, 2025 at 09:39:59PM +0800, Sune Brian wrote:

> Before the below action started. I need more background, if possible.
> If my understand is correct on your ideas. Do you mean the default driver calls
> the bclkdiv on other places? But how could that bclkdiv # be correct
> from first place?
> As I had mentioned the div # ifself like this codec is a LUT rather
> than the actual divided #?
> For example /32 from LUT is a 3b101?
> For example what if MCLK is set higher than /64 could even out of the
> LUT from first place.
> The external div # passed in, how to ensure it is codec LUT compatible
> from first place?

Systems doing this are using a machine driver written for that specific
machine and will know exactly which CODEC and other components they are
dealing with.

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