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

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Message-ID: <20230613-zoologist-panorama-a87858bba075@wendy>
Date:   Tue, 13 Jun 2023 13:28:11 +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 08:23:58PM +0800, Yingkun Meng wrote:
> 
> On 2023/6/13 01:24, Conor Dooley wrote:
> > Hey!
> > 
> > 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.
> > > 
> > > Signed-off-by: Yingkun Meng <mengyingkun@...ngson.cn>
> > I got 2 copies of this patch, but none of the rest of the series appears
> > to be threaded with it.
> > 
> > >   .../sound/loongson,ls-audio-card.yaml         | 70 +++++++++++++++++++
> > >   1 file changed, 70 insertions(+)
> > >   create mode 100644 Documentation/devicetree/bindings/sound/loongson,ls-audio-card.yaml
> > > 
> > > diff --git a/Documentation/devicetree/bindings/sound/loongson,ls-audio-card.yaml b/Documentation/devicetree/bindings/sound/loongson,ls-audio-card.yaml
> > > new file mode 100644
> > > index 000000000000..61e8babed402
> > > --- /dev/null
> > > +++ b/Documentation/devicetree/bindings/sound/loongson,ls-audio-card.yaml
> > > @@ -0,0 +1,70 @@
> > > +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> > > +%YAML 1.2
> > > +---
> > > +$id: http://devicetree.org/schemas/sound/loongson,ls-audio-card.yaml#
> > > +$schema: http://devicetree.org/meta-schemas/core.yaml#
> > > +
> > > +title: Loongson 7axxx/2kxxx ASoC audio sound card driver
> > > +
> > > +maintainers:
> > > +  - Yingkun Meng <mengyingkun@...ngson.cn>
> > > +
> > > +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"?

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