linux-kernel - [PATCH 1/3] ARM: dts: aspeed: yosemite5: Increase i2c4/i2c12 bus speed to 400 kHz

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Message-Id: <20251118-yv5_revise_dts-v1-1-fcd6b44b4497@gmail.com>
Date: Tue, 18 Nov 2025 18:53:18 +0800
From: Kevin Tung <kevin.tung.openbmc@...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, 
 Amithash Prasasd <amithash@...a.com>, Kevin Tung <Kevin.Tung@...ntatw.com>, 
 Ken Chen <Ken.Chen@...ntatw.com>, Leo Yang <Leo-Yang@...ntatw.com>, 
 Kevin Tung <kevin.tung.openbmc@...il.com>
Subject: [PATCH 1/3] ARM: dts: aspeed: yosemite5: Increase i2c4/i2c12 bus
 speed to 400 kHz

Configure i2c4 and i2c12 to operate at 400 kHz instead of 100 kHz.
This update aligns the bus settings with the hardware capabilities
and improves MCTP communication performance.

Signed-off-by: Kevin Tung <kevin.tung.openbmc@...il.com>
---
 arch/arm/boot/dts/aspeed/aspeed-bmc-facebook-yosemite5.dts | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/arm/boot/dts/aspeed/aspeed-bmc-facebook-yosemite5.dts b/arch/arm/boot/dts/aspeed/aspeed-bmc-facebook-yosemite5.dts
index 2486981f3d6bd36f3fe780b21e834b85242f8aa9..7991e9360847532cff9aad4ad4ed57d4c30668a0 100644
--- a/arch/arm/boot/dts/aspeed/aspeed-bmc-facebook-yosemite5.dts
+++ b/arch/arm/boot/dts/aspeed/aspeed-bmc-facebook-yosemite5.dts
@@ -231,6 +231,7 @@ sbtsi@4c {
 &i2c4 {
 	multi-master;
 	mctp-controller;
+	clock-frequency = <400000>;
 	status = "okay";
 
 	mctp@10 {
@@ -782,6 +783,7 @@ adc@4b {
 &i2c12 {
 	multi-master;
 	mctp-controller;
+	clock-frequency = <400000>;
 	status = "okay";
 
 	mctp@10 {

-- 
2.51.2