linux-kernel - [PATCH v1] ARM: dts: aspeed: harma: Add MCTP I2C controller node

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Message-ID: <20250926025952.3098933-1-Daniel-Hsu@quantatw.com>
Date: Fri, 26 Sep 2025 10:59:52 +0800
From: Daniel Hsu <d486250@...il.com>
To: robh@...nel.org,
	krzk+dt@...nel.org,
	conor+dt@...nel.org,
	joel@....id.au,
	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,
	Daniel Hsu <Daniel-Hsu@...ntatw.com>
Subject: [PATCH v1] ARM: dts: aspeed: harma: Add MCTP I2C controller node

The Facebook Harma BMC uses I2C1 as an MCTP (Management Component
Transport Protocol) bus. This patch enables the controller by
adding the `mctp-i2c-controller` node under I2C1, with multi-master
support.

Signed-off-by: Daniel Hsu <Daniel-Hsu@...ntatw.com>
---
 arch/arm/boot/dts/aspeed/aspeed-bmc-facebook-harma.dts | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/arch/arm/boot/dts/aspeed/aspeed-bmc-facebook-harma.dts b/arch/arm/boot/dts/aspeed/aspeed-bmc-facebook-harma.dts
index b9a93f23bd0a..2b7019c55eb6 100644
--- a/arch/arm/boot/dts/aspeed/aspeed-bmc-facebook-harma.dts
+++ b/arch/arm/boot/dts/aspeed/aspeed-bmc-facebook-harma.dts
@@ -242,6 +242,14 @@ gpio@12 {
 &i2c1 {
 	status = "okay";
 
+	mctp-controller;
+	multi-master;
+
+	mctp@10 {
+		compatible = "mctp-i2c-controller";
+		reg = <(0x10 | I2C_OWN_SLAVE_ADDRESS)>;
+	};
+
 	temperature-sensor@4b {
 		compatible = "ti,tmp75";
 		reg = <0x4b>;
-- 
2.43.0