linux-kernel - [PATCH v6 08/10] ARM: dts: aspeed: catalina: Enable multi-master on additional I2C buses

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Message-Id: <20250321-potin-catalina-dts-update-20250102-v6-8-4bd85efeb9b4@gmail.com>
Date: Fri, 21 Mar 2025 15:26:09 +0800
From: Potin Lai <potin.lai.pt@...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>, 
 Patrick Williams <patrick@...cx.xyz>
Cc: devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org, 
 linux-aspeed@...ts.ozlabs.org, linux-kernel@...r.kernel.org, 
 Cosmo Chou <cosmo.chou@...ntatw.com>, Potin Lai <potin.lai@...ntatw.com>, 
 Potin Lai <potin.lai.pt@...il.com>
Subject: [PATCH v6 08/10] ARM: dts: aspeed: catalina: Enable multi-master
 on additional I2C buses

Update the device tree to enable `multi-master` mode on I2C buses shared
between the host BMC and the NV module with HMC. This ensures proper bus
arbitration and coordination in multi-master environments, preventing
communication conflicts and improving reliability.

Signed-off-by: Potin Lai <potin.lai.pt@...il.com>
---
 arch/arm/boot/dts/aspeed/aspeed-bmc-facebook-catalina.dts | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/arm/boot/dts/aspeed/aspeed-bmc-facebook-catalina.dts b/arch/arm/boot/dts/aspeed/aspeed-bmc-facebook-catalina.dts
index 6702be32918e..2dbb65db9250 100644
--- a/arch/arm/boot/dts/aspeed/aspeed-bmc-facebook-catalina.dts
+++ b/arch/arm/boot/dts/aspeed/aspeed-bmc-facebook-catalina.dts
@@ -815,6 +815,7 @@ ssif-bmc@10 {
 
 &i2c12 {
 	status = "okay";
+	multi-master;
 
 	// Module 1 FRU EEPROM
 	eeprom@50 {
@@ -825,6 +826,7 @@ eeprom@50 {
 
 &i2c13 {
 	status = "okay";
+	multi-master;
 
 	// Module 0 FRU EEPROM
 	eeprom@50 {

-- 
2.31.1