linux-kernel - Re: [PATCH 1/4] dt-bindings: remoteproc: imx

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Message-ID:
 <PAXPR04MB9185EAFBDF13143860910C3A8938A@PAXPR04MB9185.eurprd04.prod.outlook.com>
Date: Wed, 27 Aug 2025 14:49:54 +0000
From: Shenwei Wang <shenwei.wang@....com>
To: Rob Herring <robh@...nel.org>
CC: Bjorn Andersson <andersson@...nel.org>, Mathieu Poirier
	<mathieu.poirier@...aro.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor
 Dooley <conor+dt@...nel.org>, Shawn Guo <shawnguo@...nel.org>, Sascha Hauer
	<s.hauer@...gutronix.de>, Linus Walleij <linus.walleij@...aro.org>, Bartosz
 Golaszewski <brgl@...ev.pl>, Pengutronix Kernel Team <kernel@...gutronix.de>,
	Fabio Estevam <festevam@...il.com>, Peng Fan <peng.fan@....com>,
	"linux-remoteproc@...r.kernel.org" <linux-remoteproc@...r.kernel.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"imx@...ts.linux.dev" <imx@...ts.linux.dev>,
	"linux-arm-kernel@...ts.infradead.org"
	<linux-arm-kernel@...ts.infradead.org>, "linux-kernel@...r.kernel.org"
	<linux-kernel@...r.kernel.org>, dl-linux-imx <linux-imx@....com>
Subject: Re: [PATCH 1/4] dt-bindings: remoteproc: imx_rproc: Add "rpmsg"
 subnode support



> -----Original Message-----
> From: Rob Herring <robh@...nel.org>
> Sent: Tuesday, August 26, 2025 3:09 PM
> To: Shenwei Wang <shenwei.wang@....com>
> Cc: Bjorn Andersson <andersson@...nel.org>; Mathieu Poirier
> <mathieu.poirier@...aro.org>; Krzysztof Kozlowski <krzk+dt@...nel.org>; Conor
> Dooley <conor+dt@...nel.org>; Shawn Guo <shawnguo@...nel.org>; Sascha
> Hauer <s.hauer@...gutronix.de>; Linus Walleij <linus.walleij@...aro.org>;
> Bartosz Golaszewski <brgl@...ev.pl>; Pengutronix Kernel Team
> <kernel@...gutronix.de>; Fabio Estevam <festevam@...il.com>; Peng Fan
> <peng.fan@....com>; linux-remoteproc@...r.kernel.org;
> devicetree@...r.kernel.org; imx@...ts.linux.dev; linux-arm-
> kernel@...ts.infradead.org; linux-kernel@...r.kernel.org; dl-linux-imx <linux-
> imx@....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@....com>
> > ---
> >  .../bindings/remoteproc/fsl,imx-rproc.yaml    | 117 ++++++++++++++++++
> >  1 file changed, 117 insertions(+)
> >
.43.0
> >