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 [off-list ref] wrote:

quoted

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.