linux-kernel - Re: [PATCH v5] ASoC: wm8978: add missing BCLK divider setup

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Message-ID: <200b17e5-9655-49c7-a4af-7adaf2838168@sirena.org.uk>
Date: Wed, 8 Oct 2025 21:25:57 +0100
From: Mark Brown <broonie@...nel.org>
To: Charles Keepax <ckeepax@...nsource.cirrus.com>
Cc: Sune Brian <briansune@...il.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 v5] ASoC: wm8978: add missing BCLK divider setup

On Wed, Oct 08, 2025 at 09:18:18PM +0100, Charles Keepax wrote:

> There are generally two reasons to run a faster than needed BCLK:

> 1) Because you can't generate the actual BCLK.
> 2) Because you are TDMing multiple devices onto the bus. ie.
>    something else is using those extra bits.

Another one I've seen is that you're using the BCLK as the MCLK for
another part (a few devices even require this), you might want to run
BCLK at 256fs or whatever for the MCLK even though it's not needed for
when used as BCLK.

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