linux-kernel - Re: [PATCH v3 7/7] ASoC: dt-bindings: imx-rpmsg: Add binding doc for rpmsg machine driver

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Message-ID: <20210306203617.GA1164939@robh.at.kernel.org>
Date:   Sat, 6 Mar 2021 13:36:17 -0700
From:   Rob Herring <robh@...nel.org>
To:     Shengjiu Wang <shengjiu.wang@....com>
Cc:     lgirdwood@...il.com, broonie@...nel.org, perex@...ex.cz,
        tiwai@...e.com, alsa-devel@...a-project.org,
        linux-kernel@...r.kernel.org, timur@...nel.org,
        nicoleotsuka@...il.com, Xiubo.Lee@...il.com, festevam@...il.com,
        linuxppc-dev@...ts.ozlabs.org, devicetree@...r.kernel.org
Subject: Re: [PATCH v3 7/7] ASoC: dt-bindings: imx-rpmsg: Add binding doc for
 rpmsg machine driver

On Thu, Feb 25, 2021 at 10:52:43AM +0800, Shengjiu Wang wrote:
> Imx-rpmsg is a new added machine driver for supporting audio on Cortex-M
> core. The Cortex-M core will control the audio interface, DMA and audio
> codec, setup the pipeline, the audio driver on Cortex-A core side is just
> to communitcate with M core, it is a virtual sound card and don't touch
> the hardware.

This sounds like 1 h/w block (the interface to the cortex-M), your DT 
should be 1 node. If you need 2 drivers to satisfy the needs of the OS, 
then instantiate one device from the other device's driver.

Rob