linux-kernel - RE: Re: [PATCH v3 1/2] ASoC: dt-bindings: sound-card-common: List DAPM endpoints ignoring system suspend

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Message-ID: <DB9PR04MB94987AD33756548323D8D101E3D7A@DB9PR04MB9498.eurprd04.prod.outlook.com>
Date:   Mon, 16 Oct 2023 12:08:56 +0000
From:   Chancel Liu <chancel.liu@....com>
To:     Rob Herring <robh@...nel.org>, Mark Brown <broonie@...nel.org>
CC:     "lgirdwood@...il.com" <lgirdwood@...il.com>,
        "krzysztof.kozlowski+dt@...aro.org" 
        <krzysztof.kozlowski+dt@...aro.org>,
        "conor+dt@...nel.org" <conor+dt@...nel.org>,
        "shengjiu.wang@...il.com" <shengjiu.wang@...il.com>,
        "Xiubo.Lee@...il.com" <Xiubo.Lee@...il.com>,
        "festevam@...il.com" <festevam@...il.com>,
        "nicoleotsuka@...il.com" <nicoleotsuka@...il.com>,
        "perex@...ex.cz" <perex@...ex.cz>,
        "tiwai@...e.com" <tiwai@...e.com>,
        "shawnguo@...nel.org" <shawnguo@...nel.org>,
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        "kernel@...gutronix.de" <kernel@...gutronix.de>,
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        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linuxppc-dev@...ts.ozlabs.org" <linuxppc-dev@...ts.ozlabs.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
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        <linux-arm-kernel@...ts.infradead.org>
Subject: RE: Re: [PATCH v3 1/2] ASoC: dt-bindings: sound-card-common: List
 DAPM endpoints ignoring system suspend

> >  I think the key thing
> > here is that these are endpoints that can be active over suspend of
> > the main application processor that the current operating system is
> > running (system DT stuff is an interesting corner case here...), and
> > the example is probably a bit specific.  Other bindings use "audio sound
> widgets"
> > rather than "DAPM widgets".
> >
> > We also shouldn't see that these endpoints "should not be disabled"
> > since that implies that they should be left on even if they aren't
> > active which isn't quite the case, instead it's that we can continue
> > playing an audio stream through them in suspend.
> 
> This seems like one of those things that everyone has/does, and everyone
> handles it a bit differently. I applaud trying to do something common, but it
> isn't really common until we have multiple users.
> 
> Rob

Thanks Mark and Rob for your advice. In fact, it's common use case. We can see
many drivers set widgets ignoring suspend. I will remove the linux specifics
and focus on the key concept. How about the modification on the property name
and description as following:
  ignore-suspend-widgets:
    description: |
      A list of audio sound widgets which are marked ignoring system suspend.
	  Paths between these endpoints are still active over suspend of the main
	  application processor that the current operating system is running.

Regards, 
Chancel Liu