linux-kernel - Re: [PATCH v2] ASoC: tas5805m: fix pdn polarity

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Date:   Wed, 9 Mar 2022 21:55:40 +0000
From:   Mark Brown <broonie@...nel.org>
To:     John Keeping <john@...anate.com>
Cc:     alsa-devel@...a-project.org, Liam Girdwood <lgirdwood@...il.com>,
        Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>,
        Daniel Beer <daniel.beer@...rinstitute.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] ASoC: tas5805m: fix pdn polarity

On Wed, Mar 09, 2022 at 08:16:07PM +0000, John Keeping wrote:
> On Wed, Mar 09, 2022 at 04:28:30PM +0000, Mark Brown wrote:

> > I think the device tree binding needs to be clarified here to be
> > explicit about this since there's obviously some room for user confusion
> > here.  We can probably get away with a change at this point since it's
> > not hit a release but we do need to try to avoid the situation where any
> > other implementations use active high polarity for the bindings.

> Taking a quick survey of the other devices that have a pdn-gpios
> property:

> - tvp5150 is correct with the driver setting 0 to make the device active

> - tas571x also sets 0 to make the device active

> - ak4375 uses the opposite sense setting PDN = 1 to make the device
>   active; this has no in-tree users and was merged as part of v5.17-rc1
>   so it's not in a released kernel yet

Sure, I still think it would be good to update the binding document to
clarify things as part of your patch - the binding currently just has it
as the "pdn" pin not the /pdn pin or anything.

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