linux-kernel - [PATCH] ARM: dts: aspeed: yosemite5: add x4 E1.S expansion board I2C mux

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Message-Id: <20251222-yv5_add_dvt_e1s_ioexp-v1-1-25ad202d2681@gmail.com>
Date: Mon, 22 Dec 2025 19:25:29 +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>, 
 Jackson Liu <Jackson.Liu@...ntatw.com>, 
 Kevin Tung <kevin.tung.openbmc@...il.com>
Subject: [PATCH] ARM: dts: aspeed: yosemite5: add x4 E1.S expansion board
 I2C mux

The new hardware design adds two additional E1.S devices behind an
I2C mux at address 0x73 on bus 10. Add support for this mux in the
DTS device tree.

Signed-off-by: Kevin Tung <kevin.tung.openbmc@...il.com>
---
Summary:
Revise linux device tree entry related to Meta (Facebook) Yosemite5.

Changes in v1:
- Add x4 E1.S expansion board I2C mux
---
 .../dts/aspeed/aspeed-bmc-facebook-yosemite5.dts   | 23 ++++++++++++++++++++++
 1 file changed, 23 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..87524892322c1388c146b33ac454018a31dad168 100644
--- a/arch/arm/boot/dts/aspeed/aspeed-bmc-facebook-yosemite5.dts
+++ b/arch/arm/boot/dts/aspeed/aspeed-bmc-facebook-yosemite5.dts
@@ -31,6 +31,8 @@ aliases {
 		i2c33 = &i2c30mux0ch1;
 		i2c34 = &i2c30mux0ch2;
 		i2c35 = &i2c30mux0ch3;
+		i2c36 = &i2c10mux0ch0;
+		i2c37 = &i2c10mux0ch1;
 		serial0 = &uart1;
 		serial2 = &uart3;
 		serial3 = &uart4;
@@ -702,6 +704,27 @@ eeprom@54 {
 		compatible = "atmel,24c128";
 		reg = <0x54>;
 	};
+
+	/* I2C MUX on E1S x4 board */
+	i2c-mux@73 {
+		compatible = "nxp,pca9543";
+		reg = <0x73>;
+		#address-cells = <1>;
+		#size-cells = <0>;
+		i2c-mux-idle-disconnect;
+
+		i2c10mux0ch0: i2c@0 {
+			reg = <0>;
+			#address-cells = <1>;
+			#size-cells = <0>;
+		};
+
+		i2c10mux0ch1: i2c@1 {
+			reg = <1>;
+			#address-cells = <1>;
+			#size-cells = <0>;
+		};
+	};
 };
 
 &i2c11 {

---
base-commit: 9448598b22c50c8a5bb77a9103e2d49f134c9578
change-id: 20251222-yv5_add_dvt_e1s_ioexp-14930e048043

Best regards,
-- 
Kevin Tung <kevin.tung.openbmc@...il.com>