[PATCH v6 7/7] dt-bindings: usb: add documentation for aspeed usb-vhub

[Tao Ren]

Hi Rob,

Thanks for the careful review and I've addressed all your feedback in
v7 (based on my understanding). Please kindly let me know if you have
further suggestions.


Cheers,

Tao

On Mon, Mar 02, 2020 at 05:47:44PM -0600, Rob Herring wrote:
> On Thu, Feb 27, 2020 at 06:07:57PM -0800, rentao.bupt at gmail.com wrote:
> > From: Tao Ren <rentao.bupt at gmail.com>
> > 
> > Add device tree binding documentation for the Aspeed USB 2.0 Virtual HUb
> > Controller.
> > 
> > Signed-off-by: Tao Ren <rentao.bupt at gmail.com>
> > Reviewed-by: Joel Stanley <joel at jms.id.au>
> > ---
> >  Changes in v6:
> >    - added 2 required properties into example and passed "make
> >      dt_binding_check".
> >  Changes in v5:
> >    - updated maintainer to Ben.
> >    - refined patch description per Joel's suggestion.
> >  No change in v2/v3/v4:
> >    - the patch is added to the patch series since v4.
> > 
> >  .../bindings/usb/aspeed,usb-vhub.yaml         | 73 +++++++++++++++++++
> >  1 file changed, 73 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..b9f33310e9a2
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/usb/aspeed,usb-vhub.yaml
> > @@ -0,0 +1,73 @@
> > +# SPDX-License-Identifier: GPL-2.0-or-later
> 
> Dual license new bindings please.
> 
> (GPL-2.0-only OR BSD-2-Clause)
> 
> > +# 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:
> > +  - Benjamin Herrenschmidt <benh at kernel.crashing.org>
> > +
> > +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
> 
> If 'Common' means something specific to this block, then keep. 
> Otherwise, you can drop ti.
> 
> > +
> > +  clocks:
> > +    maxItems: 1
> > +    description: The Virtual Hub Controller clock gate
> 
> Drop this.
> 
> > +
> > +  interrupts:
> > +    maxItems: 1
> > +
> > +  aspeed,vhub-downstream-ports:
> > +    description: Number of downstream ports supported by the Virtual Hub
> > +    allOf:
> > +      - $ref: /schemas/types.yaml#/definitions/uint32
> 
> Constraints?
> 
> 'maximum: 5' ?
> 
> default?
> 
> > +
> > +  aspeed,vhub-generic-endpoints:
> > +    description: Number of generic endpoints supported by the Virtual Hub
> > +    allOf:
> > +      - $ref: /schemas/types.yaml#/definitions/uint32
> 
> Constraints?
> 
> > +
> > +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 at 1e6a0000 {
> > +            compatible = "aspeed,ast2500-usb-vhub";
> > +            reg = <0x1e6a0000 0x300>;
> > +            interrupts = <5>;
> > +            clocks = <&syscon ASPEED_CLK_GATE_USBPORT1CLK>;
> > +            aspeed,vhub-downstream-ports = <5>;
> > +            aspeed,vhub-generic-endpoints = <15>;
> > +            pinctrl-names = "default";
> > +            pinctrl-0 = <&pinctrl_usb2ad_default>;
> > +    };
> > -- 
> > 2.17.1
> >