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