1 # SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
2 %YAML 1.2
3 ---
4
5 $id: http://devicetree.org/schemas/i2c/google,cros-ec-i2c-tunnel.yaml#
6 $schema: http://devicetree.org/meta-schemas/core.yaml#
7
8 title: I2C bus that tunnels through the ChromeOS EC (cros-ec)
9
10 maintainers:
11 - Doug Anderson <dianders@chromium.org>
12 - Benson Leung <bleung@chromium.org>
13
14 description: |
15 On some ChromeOS board designs we've got a connection to the EC
16 (embedded controller) but no direct connection to some devices on the
17 other side of the EC (like a battery and PMIC). To get access to
18 those devices we need to tunnel our i2c commands through the EC.
19
20 The node for this device should be under a cros-ec node like
21 google,cros-ec-spi or google,cros-ec-i2c.
22
23 allOf:
24 - $ref: /schemas/i2c/i2c-controller.yaml#
25
26 properties:
27 compatible:
28 const: google,cros-ec-i2c-tunnel
29
30 google,remote-bus:
31 description: The EC bus we'd like to talk to.
32 $ref: /schemas/types.yaml#/definitions/uint32
33
34 required:
35 - compatible
36 - google,remote-bus
37
38 unevaluatedProperties: false
39
40 examples:
41 - |
42 spi {
43 #address-cells = <1>;
44 #size-cells = <0>;
45
46 cros-ec@0 {
47 compatible = "google,cros-ec-spi";
48 reg = <0>;
49 spi-max-frequency = <5000000>;
50 interrupts = <99 0>;
51
52 i2c-tunnel {
53 compatible = "google,cros-ec-i2c-tunnel";
54 #address-cells = <1>;
55 #size-cells = <0>;
56
57 google,remote-bus = <0>;
58
59 battery: sbs-battery@b {
60 compatible = "sbs,sbs-battery";
61 reg = <0xb>;
62 sbs,poll-retry-count = <1>;
63 };
64 };
65 };
66 };
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