linux-kernel - Re: [PATCH 2/3] ASoC: dt-bindings: sama7g5-pdmc: add microchip,startup-delay-us binding

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Message-ID: <Y+5BzEJBaTn3twBH@sirena.org.uk>
Date:   Thu, 16 Feb 2023 14:46:36 +0000
From:   Mark Brown <broonie@...nel.org>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Cc:     Claudiu.Beznea@...rochip.com, lgirdwood@...il.com,
        robh+dt@...nel.org, krzysztof.kozlowski+dt@...aro.org,
        lars@...afoo.de, perex@...ex.cz, tiwai@...e.com,
        Nicolas.Ferre@...rochip.com, alexandre.belloni@...tlin.com,
        alsa-devel@...a-project.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 2/3] ASoC: dt-bindings: sama7g5-pdmc: add
 microchip,startup-delay-us binding

On Thu, Feb 16, 2023 at 11:18:16AM +0100, Krzysztof Kozlowski wrote:
> On 16/02/2023 11:15, Claudiu.Beznea@...rochip.com wrote:

> >>> +  microchip,startup-delay-us:
> >>> +    description: |
> >>> +      Specifies the delay in microseconds that needs to be applied after
> >>> +      enabling the PDMC microphones to avoid unwanted noise due to microphones
> >>> +      not being ready.

> >> Is this some hardware delay? Or OS? If OS, why Linux specific delay is
> >> put into DT?

> > It's the delay used in software workaround that IP needs to filter noises.

> Then this sounds like OS? Linux related properties usually do not belong
> to DT.

This is a hardware property, it's the time needed for the input
to settle.

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