linux-kernel - Re: [ PATCH v2 3/3] ASoC: dt-bindings: Add support for Loongson audio card

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Date:   Tue, 13 Jun 2023 13:46:41 +0100
From:   Conor Dooley <conor.dooley@...rochip.com>
To:     Yingkun Meng <mengyingkun@...ngson.cn>
CC:     Conor Dooley <conor@...nel.org>,
        <krzysztof.kozlowski+dt@...aro.org>, <robh+dt@...nel.org>,
        <conor+dt@...nel.org>, <broonie@...nel.org>, <lgirdwood@...il.com>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <alsa-devel@...a-project.org>, <loongarch@...ts.linux.dev>,
        <loongson-kernel@...ts.loongnix.cn>
Subject: Re: [ PATCH v2 3/3] ASoC: dt-bindings: Add support for Loongson
 audio card

On Tue, Jun 13, 2023 at 08:38:59PM +0800, Yingkun Meng wrote:
> On 2023/6/13 20:28, Conor Dooley wrote:
> > On Tue, Jun 13, 2023 at 08:23:58PM +0800, Yingkun Meng wrote:
> > > On 2023/6/13 01:24, Conor Dooley wrote:
> > > > On Mon, Jun 12, 2023 at 04:56:14PM +0800, YingKun Meng wrote:
> > > > > From: Yingkun Meng <mengyingkun@...ngson.cn>
> > > > > 
> > > > > The audio card uses loongson I2S controller present in
> > > > > 7axxx/2kxxx chips to transfer audio data.
> > > > > 
> > > > > On loongson platform, the chip has only one I2S controller.

> > > > > +description:
> > > > > +  The binding describes the sound card present in loongson
> > > > > +  7axxx/2kxxx platform. The sound card is an ASoC component
> > > > > +  which uses Loongson I2S controller to transfer the audio data.
> > > > > +
> > > > > +properties:
> > > > > +  compatible:
> > > > > +    const: loongson,ls-audio-card

> > > > Reviewing sound stuff is beyond my pay grade, so forgive me if I am off
> > > > the rails here, but this (and the "x"s in the description) look a bit
> > > > odd. Recently, we've noticed quite a few loongson dt-bindings attempting
> > > > to use a single compatible for many different chips.
> > > > Usually you have individual compatibles for the various SoCs with this
> > > > core, which can fall back to a generic one, rather than just adding a
> > > > generic compatible for all devices.
> > > > As far as I know, there's several SoCs fitting 2kxxx, and the format
> > > > being used elsewhere is "loongson,ls2k1000" etc.
> > > 
> > > Currently, Loongson has 2K0500/2K1000LA/2K1500/2K2000 chips.
> > > 
> > > Here, its' possible to use a single compatible for different chips,
> > > 
> > > as the audio device is a logical device, not dependent on chip model.
> > What, may I ask, is a "logical device"?
> 
> 
> I means it's not a physical one, like "platform bus".

So it is entirely a software construct? Why does it need a dt-binding
then? Your commit message says the controller is present on the device!

Confused,
Conor.

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