linux-kernel - [PATCH 3/6] ARM: dts: aspeed: mtmitchell: Add I2C Riser card alias ports

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Message-ID: <20240801091217.1408809-4-chanh@os.amperecomputing.com>
Date: Thu,  1 Aug 2024 09:12:13 +0000
From: Chanh Nguyen <chanh@...amperecomputing.com>
To: Rob Herring <robh+dt@...nel.org>,
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Joel Stanley <joel@....id.au>,
	Andrew Jeffery <andrew@...id.au>,
	devicetree@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-aspeed@...ts.ozlabs.org,
	linux-kernel@...r.kernel.org,
	OpenBMC Maillist <openbmc@...ts.ozlabs.org>,
	Open Source Submission <patches@...erecomputing.com>
Cc: Phong Vo <phong@...amperecomputing.com>,
	Thang Nguyen <thang@...amperecomputing.com>,
	Quan Nguyen <quan@...amperecomputing.com>,
	Chanh Nguyen <chanh@...amperecomputing.com>
Subject: [PATCH 3/6] ARM: dts: aspeed: mtmitchell: Add I2C Riser card alias ports

Define the I2C alias ports for the riser cards.

Besides that, it also adds the i2c muxes to switch to the i2c alias
ports.

Signed-off-by: Chanh Nguyen <chanh@...amperecomputing.com>
---
 .../aspeed/aspeed-bmc-ampere-mtmitchell.dts   | 52 +++++++++++++++++++
 1 file changed, 52 insertions(+)

diff --git a/arch/arm/boot/dts/aspeed/aspeed-bmc-ampere-mtmitchell.dts b/arch/arm/boot/dts/aspeed/aspeed-bmc-ampere-mtmitchell.dts
index 1679911e4fd8..0703b77e438b 100644
--- a/arch/arm/boot/dts/aspeed/aspeed-bmc-ampere-mtmitchell.dts
+++ b/arch/arm/boot/dts/aspeed/aspeed-bmc-ampere-mtmitchell.dts
@@ -29,6 +29,18 @@ aliases {
 		i2c30 = &ocpslot_0;
 		i2c31 = &ocpslot_1;
 
+		/*
+		 *  i2c bus 32-33 assigned to Riser slot 0-1
+		 */
+		i2c32 = &i2c_riser0;
+		i2c33 = &i2c_riser1;
+
+		/*
+		 *  i2c bus 38-39 assigned to FRU on Riser slot 0-1
+		 */
+		i2c38 = &i2c_riser0_chn_0;
+		i2c39 = &i2c_riser1_chn_0;
+
 		/*
 		 *  I2C NVMe alias port
 		 */
@@ -551,6 +563,46 @@ ocpslot_1_temp: temperature-sensor@1f {
 				reg = <0x1f>;
 			};
 		};
+
+		i2c_riser0: i2c@2 {
+			#address-cells = <1>;
+			#size-cells = <0>;
+			reg = <0x2>;
+
+			i2c-mux@72 {
+				compatible = "nxp,pca9546";
+				#address-cells = <1>;
+				#size-cells = <0>;
+				reg = <0x72>;
+				i2c-mux-idle-disconnect;
+
+				i2c_riser0_chn_0: i2c@0 {
+					#address-cells = <1>;
+					#size-cells = <0>;
+					reg = <0x0>;
+				};
+			};
+		};
+
+		i2c_riser1: i2c@3 {
+			#address-cells = <1>;
+			#size-cells = <0>;
+			reg = <0x3>;
+
+			i2c-mux@72 {
+				compatible = "nxp,pca9546";
+				#address-cells = <1>;
+				#size-cells = <0>;
+				reg = <0x72>;
+				i2c-mux-idle-disconnect;
+
+				i2c_riser1_chn_0: i2c@0 {
+					#address-cells = <1>;
+					#size-cells = <0>;
+					reg = <0x0>;
+				};
+			};
+		};
 	};
 };
 
-- 
2.43.0