linux-kernel - Re: [PATCH] ASoC: tlv320adcx140: Add controls for PDM clk and edge

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Message-ID: <20200513173230.GQ4803@sirena.org.uk>
Date:   Wed, 13 May 2020 18:32:30 +0100
From:   Mark Brown <broonie@...nel.org>
To:     Dan Murphy <dmurphy@...com>
Cc:     lgirdwood@...il.com, perex@...ex.cz, tiwai@...e.com,
        alsa-devel@...a-project.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ASoC: tlv320adcx140: Add controls for PDM clk and edge

On Wed, May 13, 2020 at 12:16:03PM -0500, Dan Murphy wrote:
> On 5/13/20 10:32 AM, Mark Brown wrote:

> > Are these (especially the clock and polarity) things that are going to
> > vary at runtime?  I'd have expected these to come from the hardware
> > rather than being something that could usefully change.

> Some microphone support low power modes that use a slower clock.
> Polarity will probably not change at run-time, but clock speed can change to
> move mics from low power/low-resolution to higher power/high-resolution
> mode.

> So polarity can be made hardware specific but clocks should be configurable.

> I can break these out into separate patches if you want.

Please, and make the bits that can't usefully vary DT properties.

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