Re: [PATCH v4 7/7] dt-bindings: usb: add documentation for aspeed usb-vhub

[Benjamin Herrenschmidt <benh@xxxxxxxxxxxxxxxxxxx>]

On Wed, 2020-02-26 at 15:03 -0800, rentao.bupt@xxxxxxxxx wrote:
> From: Tao Ren <rentao.bupt@xxxxxxxxx>
> 
> Add device tree binding documentation for aspeed usb-vhub driver.
> 
> Signed-off-by: Tao Ren <rentao.bupt@xxxxxxxxx>
> ---
>  No change in v2/v3/v4:
>    - the patch is added to the patch series since v4.
> 
>  .../bindings/usb/aspeed,usb-vhub.yaml         | 71 +++++++++++++++++++
>  1 file changed, 71 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/usb/aspeed,usb-vhub.yaml
> 
> diff --git a/Documentation/devicetree/bindings/usb/aspeed,usb-vhub.yaml b/Documentation/devicetree/bindings/usb/aspeed,usb-vhub.yaml
> new file mode 100644
> index 000000000000..6ebae46641e5
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/usb/aspeed,usb-vhub.yaml
> @@ -0,0 +1,71 @@
> +# SPDX-License-Identifier: GPL-2.0-or-later
> +# Copyright (c) 2020 Facebook Inc.
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/usb/aspeed,usb-vhub.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: ASPEED USB 2.0 Virtual Hub Controller
> +
> +maintainers:
> +  - Felipe Balbi <balbi@xxxxxxxxxx>

Actually I mantain that one, so make this Benjamin Herrenschmidt <
benh@xxxxxxxxxxxxxxxxxxx>. Felipe is the overall maintainer of the USB
gadget subsystem afaik.

> +description: |+
> +  The ASPEED USB 2.0 Virtual Hub Controller implements 1 set of USB Hub
> +  register and several sets of Device and Endpoint registers to support
> +  the Virtual Hub's downstream USB devices.
> +
> +  Supported number of devices and endpoints vary depending on hardware
> +  revisions. AST2400 and AST2500 Virtual Hub supports 5 downstream devices
> +  and 15 generic endpoints, while AST2600 Virtual Hub supports 7 downstream
> +  devices and 21 generic endpoints.
> +
> +properties:
> +  compatible:
> +    enum:
> +      - aspeed,ast2400-usb-vhub
> +      - aspeed,ast2500-usb-vhub
> +      - aspeed,ast2600-usb-vhub
> +
> +  reg:
> +    maxItems: 1
> +    description: Common configuration registers
> +
> +  clocks:
> +    maxItems: 1
> +    description: The Virtual Hub Controller clock gate
> +
> +  interrupts:
> +    maxItems: 1
> +
> +  aspeed,vhub-downstream-ports:
> +    description: Number of downstream ports supported by the Virtual Hub
> +    allOf:
> +      - $ref: /schemas/types.yaml#/definitions/uint32
> +
> +  aspeed,vhub-generic-endpoints:
> +    description: Number of generic endpoints supported by the Virtual Hub
> +    allOf:
> +      - $ref: /schemas/types.yaml#/definitions/uint32
> +
> +required:
> +  - compatible
> +  - reg
> +  - clocks
> +  - interrupts
> +  - aspeed,vhub-downstream-ports
> +  - aspeed,vhub-generic-endpoints
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    #include <dt-bindings/clock/aspeed-clock.h>
> +    vhub: usb-vhub@1e6a0000 {
> +            compatible = "aspeed,ast2500-usb-vhub";
> +            reg = <0x1e6a0000 0x300>;
> +            interrupts = <5>;
> +            clocks = <&syscon ASPEED_CLK_GATE_USBPORT1CLK>;
> +            pinctrl-names = "default";
> +            pinctrl-0 = <&pinctrl_usb2ad_default>;
> +    };