linux-kernel - RE: [PATCH 3/3] dt-bindings: usb: add documentation for aspeed udc

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Date:   Fri, 13 May 2022 15:39:14 +0000
From:   Neal Liu <neal_liu@...eedtech.com>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Joel Stanley <joel@....id.au>,
        Andrew Jeffery <andrew@...id.au>,
        Felipe Balbi <balbi@...nel.org>,
        Sumit Semwal <sumit.semwal@...aro.org>,
        Christian König <christian.koenig@....com>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        Li Yang <leoyang.li@....com>
CC:     "linux-aspeed@...ts.ozlabs.org" <linux-aspeed@...ts.ozlabs.org>,
        "linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-media@...r.kernel.org" <linux-media@...r.kernel.org>,
        "dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
        "linaro-mm-sig@...ts.linaro.org" <linaro-mm-sig@...ts.linaro.org>,
        BMC-SW <BMC-SW@...eedtech.com>
Subject: RE: [PATCH 3/3] dt-bindings: usb: add documentation for aspeed udc

> -----Original Message-----
> From: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
> Sent: Friday, May 13, 2022 5:07 PM
> To: Neal Liu <neal_liu@...eedtech.com>; Greg Kroah-Hartman
> <gregkh@...uxfoundation.org>; Rob Herring <robh+dt@...nel.org>;
> Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>; Joel Stanley
> <joel@....id.au>; Andrew Jeffery <andrew@...id.au>; Felipe Balbi
> <balbi@...nel.org>; Sumit Semwal <sumit.semwal@...aro.org>; Christian
> König <christian.koenig@....com>; Geert Uytterhoeven <geert@...ux-
> m68k.org>; Li Yang <leoyang.li@....com>
> Cc: linux-aspeed@...ts.ozlabs.org; linux-usb@...r.kernel.org;
> devicetree@...r.kernel.org; linux-arm-kernel@...ts.infradead.org; linux-
> kernel@...r.kernel.org; linux-media@...r.kernel.org; dri-
> devel@...ts.freedesktop.org; linaro-mm-sig@...ts.linaro.org; BMC-SW <BMC-
> SW@...eedtech.com>
> Subject: Re: [PATCH 3/3] dt-bindings: usb: add documentation for aspeed
> udc
> 
> On 13/05/2022 08:57, Neal Liu wrote:
> > Add device tree binding documentation for the Aspeed USB2.0 Device
> > Controller.
> >
> > Signed-off-by: Neal Liu <neal_liu@...eedtech.com>
> > ---
> >  .../devicetree/bindings/usb/aspeed,udc.yaml   | 52
> +++++++++++++++++++
> >  1 file changed, 52 insertions(+)
> >  create mode 100644
> > Documentation/devicetree/bindings/usb/aspeed,udc.yaml
> 
> Please name the file as first compatible, so "aspeed,ast2600-udc.yaml"

Okay, I could rename it for next patch if you preferred.
But there are lots of yaml files which are not named as first compatible.

> 
> >
> > diff --git a/Documentation/devicetree/bindings/usb/aspeed,udc.yaml
> > b/Documentation/devicetree/bindings/usb/aspeed,udc.yaml
> > new file mode 100644
> > index 000000000000..d1d2f77d1c54
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/usb/aspeed,udc.yaml
> > @@ -0,0 +1,52 @@
> > +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) # Copyright
> > +(c) 2020 Facebook Inc.
> > +%YAML 1.2
> > +---
> > +$id: http://devicetree.org/schemas/usb/aspeed,udc.yaml#
> > +$schema: http://devicetree.org/meta-schemas/core.yaml#
> > +
> > +title: ASPEED USB 2.0 Device Controller
> > +
> > +maintainers:
> > +  - Neal Liu <neal_liu@...eedtech.com>
> > +
> > +description: |+
> > +  The ASPEED USB 2.0 Device Controller implements 1 control endpoint
> > +and
> > +  4 generic endpoints for AST260x.
> > +
> > +  Supports independent DMA channel for each generic endpoint.
> > +  Supports 32/256 stages descriptor mode for all generic endpoints.
> > +
> > +properties:
> > +  compatible:
> > +    enum:
> > +      - aspeed,ast2600-udc
> > +
> > +  reg:
> > +    maxItems: 1
> > +
> > +  clocks:
> > +    maxItems: 1
> > +
> > +  interrupts:
> > +    maxItems: 1
> 
> No child properties? No ports or any other devices? No usb-hcd.yaml?

Aspeed udc only has 1 port, no need extra properties for now.

> > +
> > +required:
> > +  - compatible
> > +  - reg
> > +  - clocks
> > +  - interrupts
> > +
> > +additionalProperties: false
> > +
> > +examples:
> > +  - |
> > +    #include <dt-bindings/clock/aspeed-clock.h>
> > +    udc: udc@...a2000 {
> 
> Node name: usb
 
"udc" is more recognizable than "usb" I think. "usb" is too general, can be various like host or device.

> 
> > +            compatible = "aspeed,ast2600-udc";
> > +            reg = <0x1e6a2000 0x300>;
> > +            interrupts = <9>;
> > +            clocks = <&syscon ASPEED_CLK_GATE_USBPORT2CLK>;
> > +            pinctrl-names = "default";
> > +            pinctrl-0 = <&pinctrl_usb2bd_default>;
> > +    };
> 
> 
> Best regards,
> Krzysztof