linux-kernel - Re: [PATCH v2 3/7] ASoC: dt-bindings: fsl_rpmsg: Add binding doc for rpmsg cpu dai driver

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Date:   Thu, 25 Feb 2021 00:10:38 -0300
From:   Fabio Estevam <festevam@...il.com>
To:     Shengjiu Wang <shengjiu.wang@...il.com>
Cc:     Rob Herring <robh@...nel.org>,
        Shengjiu Wang <shengjiu.wang@....com>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        Linux-ALSA <alsa-devel@...a-project.org>,
        Timur Tabi <timur@...nel.org>,
        Liam Girdwood <lgirdwood@...il.com>,
        linuxppc-dev@...ts.ozlabs.org, Xiubo Li <Xiubo.Lee@...il.com>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        Takashi Iwai <tiwai@...e.com>,
        Nicolin Chen <nicoleotsuka@...il.com>,
        Mark Brown <broonie@...nel.org>
Subject: Re: [PATCH v2 3/7] ASoC: dt-bindings: fsl_rpmsg: Add binding doc for
 rpmsg cpu dai driver

On Thu, Feb 18, 2021 at 4:21 AM Shengjiu Wang <shengjiu.wang@...il.com> wrote:

> > rpmsg is a protocol. What's the h/w block?
>
> On Linux side this driver is a virtual driver, it is running
> on Arm Cortex-A core. The h/w block is controlled by
> another core (cortex-M core). so this driver actually
> doesn't touch any hardware, it just does configuration
> for rpmsg channel.
> fsl,version: There are maybe different image running on M core, this
> is the image version, different image has different function.

To answer Rob's question: the hardware block that handles these
messages is the Message Unit block.