# 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
maintainers:
- Matt Johnston <[email protected]>
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;
};
};
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