linux-kernel - [PATCH] ARM: dts: aspeed: clemente: add MCTP over I2C support

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Message-Id: <20250918-leo-dts-transceiver-v1-1-3e2580325edc@gmail.com>
Date: Thu, 18 Sep 2025 17:43:06 +0800
From: Leo Wang <leo.jt.wang@...il.com>
To: Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>, 
 Conor Dooley <conor+dt@...nel.org>, Joel Stanley <joel@....id.au>, 
 Andrew Jeffery <andrew@...econstruct.com.au>
Cc: devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org, 
 linux-aspeed@...ts.ozlabs.org, linux-kernel@...r.kernel.org, 
 george.kw.lee@...-foxconn.com, bruce.jy.hung@...-foxconn.com, 
 leo.jt.wang@...-foxconn.com, Leo Wang <leo.jt.wang@...il.com>
Subject: [PATCH] ARM: dts: aspeed: clemente: add MCTP over I2C support

Enable MCTP communication on the Meta Clemente BMC board:

- Add an MCTP I2C controller node at address 0x10 on I2C0
- Mark selected I2C mux channels as MCTP controllers
- Remove unused "i2c-mux-idle-disconnect" properties

This allows MCTP devices to be discovered and used for
management communication on the Clemente platform.

Signed-off-by: Leo Wang <leo.jt.wang@...il.com>
---
 arch/arm/boot/dts/aspeed/aspeed-bmc-facebook-clemente.dts | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/arch/arm/boot/dts/aspeed/aspeed-bmc-facebook-clemente.dts b/arch/arm/boot/dts/aspeed/aspeed-bmc-facebook-clemente.dts
index a614f947dafc9a6628c3f3d45b62ff3ca9d2b618..a2f0ed6e7bbefbdcec33f7ddebdf2de62adec164 100644
--- a/arch/arm/boot/dts/aspeed/aspeed-bmc-facebook-clemente.dts
+++ b/arch/arm/boot/dts/aspeed/aspeed-bmc-facebook-clemente.dts
@@ -269,18 +269,23 @@ &gpio1 {
 
 &i2c0 {
 	status = "okay";
+	multi-master;
+	mctp@10 {
+		compatible = "mctp-i2c-controller";
+		reg = <(0x10 | I2C_OWN_SLAVE_ADDRESS)>;
+	};
 
 	i2c-mux@71 {
 		compatible = "nxp,pca9546";
 		reg = <0x71>;
 		#address-cells = <1>;
 		#size-cells = <0>;
-		i2c-mux-idle-disconnect;
 
 		i2c0mux0ch0: i2c@0 {
 			#address-cells = <1>;
 			#size-cells = <0>;
 			reg = <0>;
+			mctp-controller;
 		};
 
 		i2c0mux0ch1: i2c@1 {
@@ -332,6 +337,7 @@ i2c0mux0ch2: i2c@2 {
 			#address-cells = <1>;
 			#size-cells = <0>;
 			reg = <2>;
+			mctp-controller;
 		};
 
 		i2c0mux0ch3: i2c@3 {
@@ -457,12 +463,12 @@ i2c-mux@75 {
 		reg = <0x75>;
 		#address-cells = <1>;
 		#size-cells = <0>;
-		i2c-mux-idle-disconnect;
 
 		i2c0mux3ch0: i2c@0 {
 			#address-cells = <1>;
 			#size-cells = <0>;
 			reg = <0>;
+			mctp-controller;
 		};
 
 		i2c0mux3ch1: i2c@1 {
@@ -514,6 +520,7 @@ i2c0mux3ch2: i2c@2 {
 			#address-cells = <1>;
 			#size-cells = <0>;
 			reg = <2>;
+			mctp-controller;
 		};
 
 		i2c0mux3ch3: i2c@3 {

---
base-commit: c65261717599d419e9c683d85f515d3ca2261549
change-id: 20250918-leo-dts-transceiver-edc31e3c21af

Best regards,
-- 
Leo Wang <leo.jt.wang@...il.com>