[PATCH v5 1/2] dt-bindings: usb: dwc3: add support for SpacemiT K1

[Ze Huang]

On Sat, Jul 05, 2025 at 09:01:25PM +0800, Ze Huang wrote:
> Add support for the USB 3.0 Dual-Role Device (DRD) controller embedded
> in the SpacemiT K1 SoC. The controller is based on the Synopsys
> DesignWare Core USB 3 (DWC3) IP, supporting USB3.0 host mode and USB 2.0
> DRD mode.
> 
> Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski at linaro.org>
> Signed-off-by: Ze Huang <huang.ze at linux.dev>
> ---

Hi Krzysztof,

I kept your Reviewed-by tag, as this version only includes minor updates:
- Dropped the `interconnects` property
- Updated the `resets` property to match the latest convention from Alex's patch

Let me know if you have any concerns.

>  .../devicetree/bindings/usb/spacemit,k1-dwc3.yaml  | 107 +++++++++++++++++++++
>  1 file changed, 107 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/usb/spacemit,k1-dwc3.yaml b/Documentation/devicetree/bindings/usb/spacemit,k1-dwc3.yaml
> new file mode 100644
> index 0000000000000000000000000000000000000000..c967ad6aae50199127a4f8a17d53fc34e8d9480b
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/usb/spacemit,k1-dwc3.yaml
> @@ -0,0 +1,107 @@
> +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/usb/spacemit,k1-dwc3.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: SpacemiT K1 SuperSpeed DWC3 USB SoC Controller
> +
> +maintainers:
> +  - Ze Huang <huang.ze at linux.dev>
> +
> +description: |
> +  The SpacemiT K1 embeds a DWC3 USB IP Core which supports Host functions
> +  for USB 3.0 and DRD for USB 2.0.
> +
> +  Key features:
> +  - USB3.0 SuperSpeed and USB2.0 High/Full/Low-Speed support
> +  - Supports low-power modes (USB2.0 suspend, USB3.0 U1/U2/U3)
> +  - Internal DMA controller and flexible endpoint FIFO sizing
> +
> +  Communication Interface:
> +  - Use of PIPE3 (125MHz) interface for USB3.0 PHY
> +  - Use of UTMI+ (30/60MHz) interface for USB2.0 PHY
> +
> +allOf:
> +  - $ref: snps,dwc3-common.yaml#
> +
> +properties:
> +  compatible:
> +    const: spacemit,k1-dwc3
> +
> +  reg:
> +    maxItems: 1
> +
> +  clocks:
> +    maxItems: 1
> +
> +  clock-names:
> +    const: usbdrd30
> +
> +  interrupts:
> +    maxItems: 1
> +
> +  phys:
> +    items:
> +      - description: phandle to USB2/HS PHY
> +      - description: phandle to USB3/SS PHY
> +
> +  phy-names:
> +    items:
> +      - const: usb2-phy
> +      - const: usb3-phy
> +
> +  resets:
> +    items:
> +      - description: USB3.0 AHB reset line
> +      - description: USB3.0 VCC reset line
> +      - description: USB3.0 PHY reset line
> +
> +  vbus-supply:
> +    description: A phandle to the regulator supplying the VBUS voltage.
> +
> +required:
> +  - compatible
> +  - reg
> +  - clocks
> +  - clock-names
> +  - interrupts
> +  - phys
> +  - phy-names
> +  - resets
> +
> +unevaluatedProperties: false
> +
> +examples:
> +  - |
> +    usb at c0a00000 {
> +        compatible = "spacemit,k1-dwc3";
> +        reg = <0xc0a00000 0x10000>;
> +        clocks = <&syscon_apmu 16>;
> +        clock-names = "usbdrd30";
> +        interrupts = <125>;
> +        phys = <&usb2phy>, <&usb3phy>;
> +        phy-names = "usb2-phy", "usb3-phy";
> +        resets = <&syscon_apmu 8>,
> +                 <&syscon_apmu 9>,
> +                 <&syscon_apmu 10>;
> +        vbus-supply = <&usb3_vbus>;
> +        #address-cells = <1>;
> +        #size-cells = <0>;
> +
> +        hub_2_0: hub at 1 {
> +            compatible = "usb2109,2817";
> +            reg = <1>;
> +            vdd-supply = <&usb3_vhub>;
> +            peer-hub = <&hub_3_0>;
> +            reset-gpios = <&gpio 3 28 1>;
> +        };
> +
> +        hub_3_0: hub at 2 {
> +            compatible = "usb2109,817";
> +            reg = <2>;
> +            vdd-supply = <&usb3_vhub>;
> +            peer-hub = <&hub_2_0>;
> +            reset-gpios = <&gpio 3 28 1>;
> +        };
> +    };
> 
> -- 
> 2.50.0
>