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# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
%YAML 1.2
---
$id: http://devicetree.org/schemas/mfd/google,cros-ec.yaml#
$schema: http://devicetree.org/meta-schemas/core.yaml#
title: ChromeOS Embedded Controller
maintainers:
- Benson Leung <bleung@chromium.org>
- Enric Balletbo i Serra <enric.balletbo@collabora.com>
- Guenter Roeck <groeck@chromium.org>
description:
Google's ChromeOS EC is a microcontroller which talks to the AP and
implements various functions such as keyboard and battery charging.
The EC can be connected through various interfaces (I2C, SPI, and others)
and the compatible string specifies which interface is being used.
properties:
compatible:
oneOf:
- description:
For implementations of the EC is connected through I2C.
const: google,cros-ec-i2c
- description:
For implementations of the EC is connected through SPI.
const: google,cros-ec-spi
- description:
For implementations of the EC is connected through RPMSG.
const: google,cros-ec-rpmsg
controller-data:
description:
SPI controller data, see bindings/spi/spi-samsung.txt
type: object
google,cros-ec-spi-pre-delay:
description:
This property specifies the delay in usecs between the
assertion of the CS and the first clock pulse.
allOf:
- $ref: /schemas/types.yaml#/definitions/uint32
- default: 0
- minimum: 0
google,cros-ec-spi-msg-delay:
description:
This property specifies the delay in usecs between messages.
allOf:
- $ref: /schemas/types.yaml#/definitions/uint32
- default: 0
- minimum: 0
google,has-vbc-nvram:
description:
Some implementations of the EC include a small nvram space used to
store verified boot context data. This boolean flag is used to specify
whether this nvram is present or not.
type: boolean
mtk,rpmsg-name:
description:
Must be defined if the cros-ec is a rpmsg device for a Mediatek
ARM Cortex M4 Co-processor. Contains the name pf the rpmsg
device. Used to match the subnode to the rpmsg device announced by
the SCP.
$ref: "/schemas/types.yaml#/definitions/string"
spi-max-frequency:
description: Maximum SPI frequency of the device in Hz.
reg:
maxItems: 1
interrupts:
maxItems: 1
wakeup-source:
description: Button can wake-up the system.
'#address-cells':
const: 1
'#size-cells':
const: 0
typec:
$ref: "/schemas/chrome/google,cros-ec-typec.yaml#"
ec-pwm:
$ref: "/schemas/pwm/google,cros-ec-pwm.yaml#"
keyboard-controller:
$ref: "/schemas/input/google,cros-ec-keyb.yaml#"
proximity:
$ref: "/schemas/iio/proximity/google,cros-ec-mkbp-proximity.yaml#"
codecs:
type: object
additionalProperties: false
properties:
'#address-cells':
const: 2
'#size-cells':
const: 1
patternProperties:
"^ec-codec@[a-f0-9]+$":
type: object
$ref: "/schemas/sound/google,cros-ec-codec.yaml#"
required:
- "#address-cells"
- "#size-cells"
cbas:
type: object
description:
This device is used to signal when a detachable base is attached
to a Chrome OS tablet. This device cannot be detected at runtime.
properties:
compatible:
const: google,cros-cbas
required:
- compatible
additionalProperties: false
patternProperties:
"^i2c-tunnel[0-9]*$":
type: object
$ref: "/schemas/i2c/google,cros-ec-i2c-tunnel.yaml#"
"^regulator@[0-9]+$":
type: object
$ref: "/schemas/regulator/google,cros-ec-regulator.yaml#"
"^extcon[0-9]*$":
type: object
$ref: "/schemas/extcon/extcon-usbc-cros-ec.yaml#"
required:
- compatible
if:
properties:
compatible:
contains:
enum:
- google,cros-ec-i2c
- google,cros-ec-rpmsg
then:
properties:
google,cros-ec-spi-pre-delay: false
google,cros-ec-spi-msg-delay: false
spi-max-frequency: false
additionalProperties: false
examples:
# Example for I2C
- |
#include <dt-bindings/gpio/gpio.h>
#include <dt-bindings/interrupt-controller/irq.h>
i2c0 {
#address-cells = <1>;
#size-cells = <0>;
cros-ec@1e {
compatible = "google,cros-ec-i2c";
reg = <0x1e>;
interrupts = <6 0>;
interrupt-parent = <&gpio0>;
};
};
# Example for SPI
- |
#include <dt-bindings/gpio/gpio.h>
#include <dt-bindings/interrupt-controller/irq.h>
spi0 {
#address-cells = <1>;
#size-cells = <0>;
cros-ec@0 {
compatible = "google,cros-ec-spi";
reg = <0x0>;
google,cros-ec-spi-msg-delay = <30>;
google,cros-ec-spi-pre-delay = <10>;
interrupts = <99 0>;
interrupt-parent = <&gpio7>;
spi-max-frequency = <5000000>;
proximity {
compatible = "google,cros-ec-mkbp-proximity";
};
cbas {
compatible = "google,cros-cbas";
};
};
};
# Example for RPMSG
- |
scp0 {
cros-ec {
compatible = "google,cros-ec-rpmsg";
};
};
...
|
