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

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Message-ID: <449d07d9-5538-4f36-83a0-3a81a9ab9ea2@sirena.org.uk>
Date:   Tue, 13 Jun 2023 14:54:36 +0100
From:   Mark Brown <broonie@...nel.org>
To:     Conor Dooley <conor.dooley@...rochip.com>
Cc:     Yingkun Meng <mengyingkun@...ngson.cn>,
        Conor Dooley <conor@...nel.org>,
        krzysztof.kozlowski+dt@...aro.org, robh+dt@...nel.org,
        conor+dt@...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 01:46:41PM +0100, Conor Dooley wrote:

> 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!

A typical embedded (or power efficient laptop) audio design will consist
of multiple devices connected together (frequently via non-control
buses) together with system level passive components and plastics which
are also important to the audio configuration.  A card binding describes
the interconections between the devices in the system and provides
identification information for the audio subsystem.  This system level
audio integration is a physical thing that can be pointed at that
requires real software control.

Like I said before please look at the existing audio card bindings.

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