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+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/net/mctp-i2c-controller.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: MCTP I2C transport binding
+
+maintainers:
+ - Matt Johnston <matt@codeconstruct.com.au>
+
+description: |
+ An mctp-i2c-controller defines a local MCTP endpoint on an I2C controller.
+ MCTP I2C is specified by DMTF DSP0237.
+
+ An mctp-i2c-controller must be attached to an I2C adapter which supports
+ slave functionality. I2C busses (either directly or as subordinate mux
+ busses) are attached to the mctp-i2c-controller with a 'mctp-controller'
+ property on each used bus. Each mctp-controller I2C bus will be presented
+ to the host system as a separate MCTP I2C instance.
+
+properties:
+ compatible:
+ const: mctp-i2c-controller
+
+ reg:
+ minimum: 0x40000000
+ maximum: 0x4000007f
+ description: |
+ 7 bit I2C address of the local endpoint.
+ I2C_OWN_SLAVE_ADDRESS (1<<30) flag must be set.
+
+additionalProperties: false
+
+required:
+ - compatible
+ - reg
+
+examples:
+ - |
+ // Basic case of a single I2C bus
+ #include <dt-bindings/i2c/i2c.h>
+
+ i2c {
+ #address-cells = <1>;
+ #size-cells = <0>;
+ mctp-controller;
+
+ mctp@30 {
+ compatible = "mctp-i2c-controller";
+ reg = <(0x30 | I2C_OWN_SLAVE_ADDRESS)>;
+ };
+ };
+
+ - |
+ // Mux topology with multiple MCTP-handling busses under
+ // a single mctp-i2c-controller.
+ // i2c1 and i2c6 can have MCTP devices, i2c5 does not.
+ #include <dt-bindings/i2c/i2c.h>
+
+ i2c1: i2c {
+ #address-cells = <1>;
+ #size-cells = <0>;
+ mctp-controller;
+
+ mctp@50 {
+ compatible = "mctp-i2c-controller";
+ reg = <(0x50 | I2C_OWN_SLAVE_ADDRESS)>;
+ };
+ };
+
+ i2c-mux {
+ #address-cells = <1>;
+ #size-cells = <0>;
+ i2c-parent = <&i2c1>;
+
+ i2c5: i2c@0 {
+ #address-cells = <1>;
+ #size-cells = <0>;
+ reg = <0>;
+ eeprom@33 {
+ reg = <0x33>;
+ };
+ };
+
+ i2c6: i2c@1 {
+ #address-cells = <1>;
+ #size-cells = <0>;
+ reg = <1>;
+ mctp-controller;
+ };
+ };