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# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
%YAML 1.2
---
$id: http://devicetree.org/schemas/i2c/google,cros-ec-i2c-tunnel.yaml#
$schema: http://devicetree.org/meta-schemas/core.yaml#
title: I2C bus that tunnels through the ChromeOS EC (cros-ec)
maintainers:
- Doug Anderson <dianders@chromium.org>
- Benson Leung <bleung@chromium.org>
description: |
On some ChromeOS board designs we've got a connection to the EC
(embedded controller) but no direct connection to some devices on the
other side of the EC (like a battery and PMIC). To get access to
those devices we need to tunnel our i2c commands through the EC.
The node for this device should be under a cros-ec node like
google,cros-ec-spi or google,cros-ec-i2c.
allOf:
- $ref: i2c-controller.yaml#
properties:
compatible:
const: google,cros-ec-i2c-tunnel
google,remote-bus:
description: The EC bus we'd like to talk to.
$ref: /schemas/types.yaml#/definitions/uint32
required:
- compatible
- google,remote-bus
unevaluatedProperties: false
examples:
- |
spi0 {
#address-cells = <1>;
#size-cells = <0>;
cros-ec@0 {
compatible = "google,cros-ec-spi";
reg = <0>;
spi-max-frequency = <5000000>;
i2c-tunnel {
compatible = "google,cros-ec-i2c-tunnel";
#address-cells = <1>;
#size-cells = <0>;
google,remote-bus = <0>;
battery: sbs-battery@b {
compatible = "sbs,sbs-battery";
reg = <0xb>;
sbs,poll-retry-count = <1>;
};
};
};
};
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