From: Yu Chen <chenyu56@xxxxxxxxxx> This patch adds binding documentation to support USB HUB and USB data role switch of HiSilicon HiKey960 and HiKey970 boards. [mchehab: updated OF schema and added HiKey970 example] Signed-off-by: Yu Chen <chenyu56@xxxxxxxxxx> Signed-off-by: John Stultz <john.stultz@xxxxxxxxxx> Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@xxxxxxxxxx> --- .../bindings/misc/hisilicon,hikey-usb.yaml | 87 +++++++++++++++++++ 1 file changed, 87 insertions(+) create mode 100644 Documentation/devicetree/bindings/misc/hisilicon,hikey-usb.yaml diff --git a/Documentation/devicetree/bindings/misc/hisilicon,hikey-usb.yaml b/Documentation/devicetree/bindings/misc/hisilicon,hikey-usb.yaml new file mode 100644 index 000000000000..761ab686121a --- /dev/null +++ b/Documentation/devicetree/bindings/misc/hisilicon,hikey-usb.yaml @@ -0,0 +1,87 @@ +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause) +# Copyright 2019 Linaro Ltd. +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/misc/hisilicon,hikey-usb.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: HiKey960/970 onboard USB GPIO Hub + +maintainers: + - John Stultz <john.stultz@xxxxxxxxxx> + +description: | + Supports the onboard USB GPIO hubs found on HiKey960/970. + Such hubs require a power supply for the USB I/O. Depending on the + exact hub model, after USB I/O is powered up, a reset should be needed. + + It also acts as a role-switch intermediary to detect the state of + the USB-C port, to switch the hub into dual-role USB-C or host mode, + which enables and powers up the onboard USB-A host ports. + + Schematics about such hubs can be found here: + https://github.com/96boards/documentation/raw/master/consumer/hikey/hikey960/hardware-docs/HiKey960_Schematics.pdf + https://www.96boards.org/documentation/consumer/hikey/hikey970/hardware-docs/files/hikey970-schematics.pdf + +properties: + compatible: + enum: + - hisilicon,usbhub + + typec-vbus-gpios: + $ref: /schemas/types.yaml#/definitions/phandle-array + description: phandle to the typec-vbus gpio + + otg-switch-gpios: + $ref: /schemas/types.yaml#/definitions/phandle-array + description: phandle to the otg-switch gpio + + hub-reset-en-gpios: + $ref: /schemas/types.yaml#/definitions/phandle-array + description: phandle to the hub reset gpio + + usb-role-switch: + $ref: /schemas/types.yaml#/definitions/flag + description: Support role switch. + + hub-vdd-supply: + description: regulator for hub power + + port: + description: | + describe hadware connections between USB endpoints. + Two ports are supported: the first being the endpoint that will + be notified by this driver, and the second being the endpoint + that notifies this driver of a role switch. + +required: + - compatible + - hub-vdd-supply + - port + +additionalProperties: false + +examples: + - | + #include <dt-bindings/gpio/gpio.h> + + usb-hub { + compatible = "hisilicon,usbhub"; + typec-vbus-gpios = <&gpio25 2 GPIO_ACTIVE_HIGH>; + otg-switch-gpios = <&gpio25 6 GPIO_ACTIVE_HIGH>; + hub-reset-en-gpios = <&gpio0 3 GPIO_ACTIVE_HIGH>; + hub-vdd-supply = <&usb_hub_vdd>; + usb-role-switch; + port { + #address-cells = <1>; + #size-cells = <0>; + usb_ep0: endpoint@0 { + reg = <0>; + remote-endpoint = <&dwc3_role_switch>; + }; + usb_ep1: endpoint@1 { + reg = <1>; + remote-endpoint = <&rt1711h_ep>; + }; + }; + }; -- 2.31.1
