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Sat, 30 Aug 2025 17:44:09 +0000 Received: from PAXPR04MB9185.eurprd04.prod.outlook.com ([fe80::21bf:975e:f24d:1612]) by PAXPR04MB9185.eurprd04.prod.outlook.com ([fe80::21bf:975e:f24d:1612%7]) with mapi id 15.20.9094.011; Sat, 30 Aug 2025 17:44:08 +0000 From: Shenwei Wang To: Rob Herring CC: Bjorn Andersson , Mathieu Poirier , Krzysztof Kozlowski , Conor Dooley , Shawn Guo , Sascha Hauer , Linus Walleij , Bartosz Golaszewski , Pengutronix Kernel Team , Fabio Estevam , Peng Fan , "linux-remoteproc@vger.kernel.org" , "devicetree@vger.kernel.org" , "imx@lists.linux.dev" , "linux-arm-kernel@lists.infradead.org" , "linux-kernel@vger.kernel.org" , dl-linux-imx Subject: Re: [PATCH 1/4] dt-bindings: remoteproc: imx_rproc: Add "rpmsg" subnode support Thread-Topic: [PATCH 1/4] dt-bindings: remoteproc: imx_rproc: Add "rpmsg" subnode support Thread-Index: AQHcGdWvuXRrlT06BUO4LAXqOCqHSQ== Date: Sat, 30 Aug 2025 17:44:08 +0000 Message-ID: References: <20250818204420.794554-1-shenwei.wang@nxp.com> <20250818204420.794554-2-shenwei.wang@nxp.com> <20250826200904.GA375876-robh@kernel.org> <20250829150655.GA782291-robh@kernel.org> In-Reply-To: <20250829150655.GA782291-robh@kernel.org> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: authentication-results: dkim=none (message not signed) header.d=none;dmarc=none action=none header.from=nxp.com; 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charset="us-ascii" Content-Transfer-Encoding: quoted-printable Precedence: bulk X-Mailing-List: devicetree@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-OriginatorOrg: nxp.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-AuthSource: PAXPR04MB9185.eurprd04.prod.outlook.com X-MS-Exchange-CrossTenant-Network-Message-Id: 9879ae61-c045-48dd-c50d-08dde7ecd286 X-MS-Exchange-CrossTenant-originalarrivaltime: 30 Aug 2025 17:44:08.6429 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 686ea1d3-bc2b-4c6f-a92c-d99c5c301635 X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: AbeC71x915nRLC3AlHzv7YE9kMc/cGnTMZmMgTg6GlEeCxacon6p5DxYHaEQGGZFufpfkRN5Q9iJMpLW1c5FOQ== X-MS-Exchange-Transport-CrossTenantHeadersStamped: AM7PR04MB6823 > -----Original Message----- > From: Rob Herring > Sent: Friday, August 29, 2025 10:07 AM > To: Shenwei Wang > Cc: Bjorn Andersson ; Mathieu Poirier > ; Krzysztof Kozlowski ; C= onor > Dooley ; Shawn Guo ; Sascha > Hauer ; Linus Walleij ; > Bartosz Golaszewski ; Pengutronix Kernel Team > ; Fabio Estevam ; Peng Fan > ; linux-remoteproc@vger.kernel.org; > devicetree@vger.kernel.org; imx@lists.linux.dev; linux-arm- > kernel@lists.infradead.org; linux-kernel@vger.kernel.org; dl-linux-imx imx@nxp.com> > Subject: [EXT] Re: [PATCH 1/4] dt-bindings: remoteproc: imx_rproc: Add "r= pmsg" > subnode support > > > > > > > > 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-def= ined in > the dts. >=20 > But you did define addresses. How do you know which channel 'gpio@1' > corresponds to if RPMSG dynamically assigns addresses? >=20 The remote devices within the rpmsg channels use pre-defined addresses spec= ified in=20 the DTS. For example, the gpio@0 and gpio@1 nodes represent devices inside = the=20 rpmsg-io-channel, each assigned a unique address within that channel. The rpmsg-io-channel itself does not have a fixed address, as its address i= s dynamically=20 allocated by the RPMSG bus. Therefore, we only use the unique channel name = here. rpmsg { rpmsg-io-channel { gpio@0 { compatible =3D "fsl,imx-rpmsg-gpio"; reg =3D <0>; }; gpio@1 { compatible =3D "fsl,imx-rpmsg-gpio"; reg =3D <1>; }; ... }; ... }; Thanks, Shenwei > Rob