Re: [PATCH v4 1/4] dt-bindings: usb: add Altera Agilex5 DWC3 controller

[Conor Dooley]

On Fri, Sep 04, 2026 at 04:46:10PM +0800, Adrian Ng Ho Yin wrote:
> Add a binding for the Altera Agilex5 SoC integration of the Synopsys DWC3
> USB controller (compatible "altr,agilex5-dwc3"), covering clocks, resets,
> PHYs, and optional IOMMU support.
> 
> Clock names follow the snps,dwc3.yaml example order (bus_early, ref,
> suspend). Reset names use core/ecc. On this SoC ref and suspend are the
> same hardware source, so the example reuses AGILEX5_USB31_SUSPEND_CLK.
> 
> Signed-off-by: Adrian Ng Ho Yin <adrian.ho.yin.ng@xxxxxxxxxx>
> ---
>  .../bindings/usb/altr,agilex5-dwc3.yaml       | 100 ++++++++++++++++++
>  1 file changed, 100 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/usb/altr,agilex5-dwc3.yaml
> 
> diff --git a/Documentation/devicetree/bindings/usb/altr,agilex5-dwc3.yaml b/Documentation/devicetree/bindings/usb/altr,agilex5-dwc3.yaml
> new file mode 100644
> index 000000000000..e172706474f5
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/usb/altr,agilex5-dwc3.yaml
> @@ -0,0 +1,100 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/usb/altr,agilex5-dwc3.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Altera Agilex5 DWC3 USB SoC Controller
> +
> +maintainers:
> +  - Adrian Ng Ho Yin <adrian.ho.yin.ng@xxxxxxxxxx>
> +
> +description:
> +  The Altera Agilex5 SoCFPGA integrates a Synopsys DesignWare USB3 (DWC3)
> +  controller that supports host, device and DRD modes.
> +
> +allOf:
> +  - $ref: snps,dwc3-common.yaml#
> +
> +properties:
> +  compatible:
> +    const: altr,agilex5-dwc3
> +
> +  reg:
> +    maxItems: 1
> +
> +  clocks:
> +    items:
> +      - description: Master/Core bus clock
> +      - description: Controller reference clock
> +      - description: Controller suspend clock
> +
> +  clock-names:
> +    items:
> +      - const: bus_early
> +      - const: ref
> +      - const: suspend
> +
> +  interrupts:
> +    maxItems: 1
> +
> +  phys:
> +    minItems: 2
> +    maxItems: 2
> +
> +  phy-names:
> +    items:
> +      - const: usb2-phy
> +      - const: usb3-phy
> +
> +  iommus:
> +    maxItems: 1
> +
> +  resets:
> +    items:
> +      - description: DWC3 core reset
> +      - description: DWC3 ECC reset
> +
> +  reset-names:
> +    items:
> +      - const: core
> +      - const: ecc
> +
> +required:
> +  - compatible
> +  - reg
> +  - clocks
> +  - clock-names
> +  - interrupts
> +  - phys
> +  - phy-names
> +  - resets
> +  - reset-names
> +
> +unevaluatedProperties: false

I'm never keen on unevaluatedProperties for dwc3 stuff, cos there are
lots of properties in there that I do not believe should be used in
general.
Could you instead use "additionalProperties: false" and add "foo: true"
for any properties (other than the ones you've already got) that you
need?

Otherwise, this looks good to me.
pw-bot: changes-requested

Thanks,
Conor.

> +
> +examples:
> +  - |
> +    #include <dt-bindings/interrupt-controller/arm-gic.h>
> +    #include <dt-bindings/reset/altr,rst-mgr-s10.h>
> +    #include <dt-bindings/clock/intel,agilex5-clkmgr.h>
> +
> +    soc {
> +        #address-cells = <1>;
> +        #size-cells = <1>;
> +
> +        usb@11000000 {
> +            compatible = "altr,agilex5-dwc3";
> +            reg = <0x11000000 0x100000>;
> +            interrupts = <GIC_SPI 94 IRQ_TYPE_LEVEL_HIGH>;
> +            clocks = <&clkmgr AGILEX5_USB31_BUS_CLK_EARLY>,
> +                     <&clkmgr AGILEX5_USB31_SUSPEND_CLK>,
> +                     <&clkmgr AGILEX5_USB31_SUSPEND_CLK>;
> +            clock-names = "bus_early", "ref", "suspend";
> +            phys = <&usbphy0>, <&usbphy1>;
> +            phy-names = "usb2-phy", "usb3-phy";
> +            resets = <&rst USB1_RESET>, <&rst USB1_OCP_RESET>;
> +            reset-names = "core", "ecc";
> +            iommus = <&smmu 7>;
> +        };
> +    };
> -- 
> 2.49.GIT
>

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