[PATCH 1/4] dt-bindings: remoteproc: imx_rproc: Add "rpmsg" subnode support

[Shenwei Wang]

> -----Original Message-----
> From: Rob Herring <robh at kernel.org>
> Sent: Tuesday, August 26, 2025 3:09 PM
> To: Shenwei Wang <shenwei.wang at nxp.com>
> Cc: Bjorn Andersson <andersson at kernel.org>; Mathieu Poirier
> <mathieu.poirier at linaro.org>; Krzysztof Kozlowski <krzk+dt at kernel.org>; Conor
> Dooley <conor+dt at kernel.org>; Shawn Guo <shawnguo at kernel.org>; Sascha
> Hauer <s.hauer at pengutronix.de>; Linus Walleij <linus.walleij at linaro.org>;
> Bartosz Golaszewski <brgl at bgdev.pl>; Pengutronix Kernel Team
> <kernel at pengutronix.de>; Fabio Estevam <festevam at gmail.com>; Peng Fan
> <peng.fan at nxp.com>; linux-remoteproc at vger.kernel.org;
> devicetree at vger.kernel.org; imx at lists.linux.dev; linux-arm-
> kernel at lists.infradead.org; linux-kernel at vger.kernel.org; dl-linux-imx <linux-
> imx at nxp.com>
> Subject: [EXT] Re: [PATCH 1/4] dt-bindings: remoteproc: imx_rproc: Add "rpmsg"
> subnode support
> > Each subnode within "rpmsg" represents an individual RPMSG channel.
> > The name of each subnode corresponds to the channel name as defined by
> > the remote processor.
> >
> > All remote devices associated with a given channel are defined as
> > child nodes under the corresponding channel node.
> 
> How is each channel addressed? Are they really grouped by type first (i2c, gpio,
> etc.) then an address within the group? Or is there some flat channel numbering?
> If the latter, then the addresses in the DT shoulc match the channel number.
> 

Yes, the channels are grouped by type and identified by unique channel names assigned 
by the remote processor.

The RPMSG bus dynamically assigns addresses to each channel at runtime. Because these 
addresses are not static, they cannot be pre-defined in the dts.

Thanks,
Shenwei

> >
> > Signed-off-by: Shenwei Wang <shenwei.wang at nxp.com>
> > ---
> >  .../bindings/remoteproc/fsl,imx-rproc.yaml    | 117 ++++++++++++++++++
> >  1 file changed, 117 insertions(+)
> >
.43.0
> >