| # 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> |
| - 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 connected through I2C. |
| const: google,cros-ec-i2c |
| - description: |
| For implementations of the EC connected through SPI. |
| const: google,cros-ec-spi |
| - description: |
| For implementations of the FPMCU connected through SPI. |
| items: |
| - const: google,cros-ec-fp |
| - const: google,cros-ec-spi |
| - description: |
| For implementations of the EC connected through RPMSG. |
| const: google,cros-ec-rpmsg |
| |
| controller-data: true |
| |
| 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. |
| $ref: /schemas/types.yaml#/definitions/uint32 |
| default: 0 |
| |
| google,cros-ec-spi-msg-delay: |
| description: |
| This property specifies the delay in usecs between messages. |
| $ref: /schemas/types.yaml#/definitions/uint32 |
| default: 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 |
| |
| mediatek,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 of 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: true |
| |
| reg: |
| maxItems: 1 |
| |
| interrupts: |
| maxItems: 1 |
| |
| reset-gpios: |
| maxItems: 1 |
| |
| boot0-gpios: |
| maxItems: 1 |
| description: Assert for bootloader mode. |
| |
| vdd-supply: true |
| |
| 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#" |
| deprecated: true |
| |
| pwm: |
| $ref: "/schemas/pwm/google,cros-ec-pwm.yaml#" |
| |
| kbd-led-backlight: |
| $ref: "/schemas/chrome/google,cros-kbd-led-backlight.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 |
| |
| allOf: |
| - if: |
| properties: |
| compatible: |
| not: |
| contains: |
| const: google,cros-ec-spi |
| then: |
| properties: |
| controller-data: false |
| google,cros-ec-spi-pre-delay: false |
| google,cros-ec-spi-msg-delay: false |
| spi-max-frequency: false |
| else: |
| $ref: /schemas/spi/spi-peripheral-props.yaml |
| |
| - if: |
| properties: |
| compatible: |
| not: |
| contains: |
| const: google,cros-ec-rpmsg |
| then: |
| properties: |
| mediatek,rpmsg-name: false |
| |
| required: |
| - reg |
| - interrupts |
| |
| - if: |
| properties: |
| compatible: |
| contains: |
| const: google,cros-ec-fp |
| then: |
| properties: |
| '#address-cells': false |
| '#size-cells': false |
| typec: false |
| ec-pwm: false |
| kbd-led-backlight: false |
| keyboard-controller: false |
| proximity: false |
| codecs: false |
| cbas: false |
| |
| patternProperties: |
| "^i2c-tunnel[0-9]*$": false |
| "^regulator@[0-9]+$": false |
| "^extcon[0-9]*$": false |
| |
| # Using additionalProperties: false here and |
| # listing true properties doesn't work |
| |
| required: |
| - reset-gpios |
| - boot0-gpios |
| - vdd-supply |
| else: |
| properties: |
| reset-gpios: false |
| boot0-gpios: false |
| vdd-supply: 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"; |
| }; |
| }; |
| |
| # Example for FPMCU |
| - | |
| spi0 { |
| #address-cells = <0x1>; |
| #size-cells = <0x0>; |
| |
| ec@0 { |
| compatible = "google,cros-ec-fp", "google,cros-ec-spi"; |
| reg = <0x0>; |
| interrupt-parent = <&gpio_controller>; |
| interrupts = <4 IRQ_TYPE_LEVEL_LOW>; |
| spi-max-frequency = <3000000>; |
| reset-gpios = <&gpio_controller 5 GPIO_ACTIVE_LOW>; |
| boot0-gpios = <&gpio_controller 10 GPIO_ACTIVE_HIGH>; |
| vdd-supply = <&pp3300_fp_mcu>; |
| }; |
| }; |
| ... |
