Re: [PATCH v1 1/4] dt-bindings: Add CIX Sky1 USB bindings

[Conor Dooley <conor@kernel.org>]

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On Mon, Aug 31, 2026 at 04:23:05PM +0800, Hongliang Yang wrote:
> Add device tree bindings for CIX Sky1 USB3 PHY and Cadence USBSSP
> controller glue layer.
> 
> Signed-off-by: Hongliang Yang <hongliang.yang@cixtech.com>
> ---
>  .../bindings/phy/cix,sky1-usb3-phy.yaml       | 109 +++++++++++++
>  .../bindings/usb/cix,sky1-usbssp.yaml         | 153 ++++++++++++++++++

Two patches please.

>  MAINTAINERS                                   |   3 +
>  3 files changed, 265 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/phy/cix,sky1-usb3-phy.yaml
>  create mode 100644 Documentation/devicetree/bindings/usb/cix,sky1-usbssp.yaml
> 
> diff --git a/Documentation/devicetree/bindings/phy/cix,sky1-usb3-phy.yaml b/Documentation/devicetree/bindings/phy/cix,sky1-usb3-phy.yaml
> new file mode 100644
> index 000000000000..76d020df72dd
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/phy/cix,sky1-usb3-phy.yaml
> @@ -0,0 +1,109 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/phy/cix,sky1-usb3-phy.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: CIX Sky1 USB3 PHY
> +
> +maintainers:
> +  - Hongliang Yang <hongliang.yang@cixtech.com>
> +
> +description:
> +  The CIX Sky1 USB3 PHY is a multi-port SuperSpeedPlus PHY that
> +  supports up to two USB3 lanes. Each port is represented as a
> +  child node of the PHY controller.
> +
> +properties:
> +  compatible:
> +    const: cix,sky1-usb3-phy
> +
> +  reg:
> +    maxItems: 1
> +
> +  clocks:
> +    items:
> +      - description: APB register interface clock
> +      - description: PHY reference clock
> +
> +  clock-names:
> +    items:
> +      - const: apb_clk
> +      - const: ref_clk

drop "_clk", they're both clocks..
pw-bot: changes-requested

> +
> +  resets:
> +    items:
> +      - description: PHY reset
> +      - description: PHY APB preset
> +
> +  reset-names:
> +    items:
> +      - const: reset
> +      - const: preset

drop "reset" from here, they're both resets. Call them "core" and "apb"
or something instead.

> +
> +  "#address-cells":
> +    const: 1
> +
> +  "#size-cells":
> +    const: 0
> +
> +patternProperties:
> +  "^usb-port@[0-9a-f]+$":

> +    type: object
> +    description:
> +      A single USB3 PHY port/lane.
> +
> +    properties:
> +      reg:
> +        maxItems: 1

> +
> +      "#phy-cells":
> +        const: 0
> +
> +    required:
> +      - reg
> +      - "#phy-cells"
> +
> +    additionalProperties: false
> +
> +required:
> +  - compatible
> +  - reg
> +  - clocks
> +  - clock-names
> +  - resets
> +  - reset-names
> +  - "#address-cells"
> +  - "#size-cells"
> +
> +unevaluatedProperties: false
> +
> +examples:
> +  - |
> +    #include <dt-bindings/clock/cix,sky1.h>
> +    #include <dt-bindings/reset/cix,sky1-s5-system-control.h>
> +
> +    usb-phy@9210000 {
> +        compatible = "cix,sky1-usb3-phy";
> +        reg = <0x09210000 0x40000>;
> +        #address-cells = <1>;
> +        #size-cells = <0>;
> +
> +        resets = <&s5_syscon SKY1_USBPHY_SS_RST_N>,
> +                 <&s5_syscon SKY1_USBPHY_SS_PST_N>;
> +        reset-names = "reset", "preset";
> +
> +        clocks = <&scmi_clk CLK_TREE_USB3A_PHY3_GATE>,
> +                 <&scmi_clk CLK_TREE_USB3A_PHY_x2_REF>;
> +        clock-names = "apb_clk", "ref_clk";
> +
> +        usb-port@0 {
> +            reg = <0>;
> +            #phy-cells = <0>;
> +        };
> +
> +        usb-port@1 {
> +            reg = <1>;
> +            #phy-cells = <0>;
> +        };
> +    };
> diff --git a/Documentation/devicetree/bindings/usb/cix,sky1-usbssp.yaml b/Documentation/devicetree/bindings/usb/cix,sky1-usbssp.yaml
> new file mode 100644
> index 000000000000..47202ff5b9e5
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/usb/cix,sky1-usbssp.yaml
> @@ -0,0 +1,153 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/usb/cix,sky1-usbssp.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: CIX Sky1 Cadence USBSSP Controller
> +
> +maintainers:
> +  - Hongliang Yang <hongliang.yang@cixtech.com>
> +
> +description:
> +  The CIX Sky1 USBSSP controller is based on the Cadence USBSSP DRD
> +  controller. The integration adds glue registers and mode strap controls
> +  in the Sky1 S5 system controller. The CIX glue node wraps a Cadence
> +  USBSSP core as a child node.
> +
> +properties:
> +  compatible:
> +    const: cix,sky1-usbssp
> +
> +  reg:
> +    items:
> +      - description: AXI property configuration register
> +      - description: Controller status register
> +
> +  reg-names:
> +    items:
> +      - const: axi_property
> +      - const: controller_status
> +
> +  clocks:
> +    items:
> +      - description: Start-of-frame clock
> +      - description: AXI bus clock
> +      - description: Low-power mode clock
> +      - description: APB register interface clock
> +
> +  clock-names:
> +    items:
> +      - const: sof_clk
> +      - const: usb_aclk
> +      - const: lpm_clk
> +      - const: usb_pclk

Same stuff here on naming

> +
> +  resets:
> +    items:
> +      - description: APB register reset
> +      - description: Controller reset
> +
> +  reset-names:
> +    items:
> +      - const: usb_preset
> +      - const: usb_reset

and here.

> +
> +  cix,usb_syscon:

No underscores in property names.

> +    $ref: /schemas/types.yaml#/definitions/phandle
> +    description:
> +      Phandle to the Sky1 S5 system controller used to program USB mode
> +      strap controls.
> +
> +  axi_bmax_value:

Missing vendor prefix.
No underscores in property names.

Why is this not a fixed value per SoC?

Cheers,
Conor.

> +    $ref: /schemas/types.yaml#/definitions/uint32
> +    default: 0x7
> +    description:
> +      AXI bus maximum burst length configuration value.
> +
> +  "#address-cells":
> +    const: 2
> +
> +  "#size-cells":
> +    const: 2
> +
> +  ranges: true
> +
> +patternProperties:
> +  "^usb-controller@[0-9a-f]+$":
> +    $ref: cdns,usb3.yaml#
> +    description:
> +      The Cadence USBSSP core controller node. See cdns,usb3.yaml
> +      for properties such as dr_mode, maximum-speed, phys, and interrupts.
> +    unevaluatedProperties: false
> +
> +required:
> +  - compatible
> +  - reg
> +  - reg-names
> +  - clocks
> +  - clock-names
> +  - resets
> +  - reset-names
> +  - cix,usb_syscon
> +  - "#address-cells"
> +  - "#size-cells"
> +  - ranges
> +
> +unevaluatedProperties: false
> +
> +examples:
> +  - |
> +    #include <dt-bindings/clock/cix,sky1.h>
> +    #include <dt-bindings/interrupt-controller/arm-gic.h>
> +    #include <dt-bindings/reset/cix,sky1-s5-system-control.h>
> +
> +    soc {
> +        #address-cells = <2>;
> +        #size-cells = <2>;
> +
> +        usb@91c0300 {
> +            compatible = "cix,sky1-usbssp";
> +            #address-cells = <2>;
> +            #size-cells = <2>;
> +            ranges;
> +
> +            reg = <0x00 0x091c0314 0x00 0x4>,
> +                  <0x00 0x091c0400 0x00 0x4>;
> +            reg-names = "axi_property", "controller_status";
> +
> +            resets = <&src SKY1_USBC_SS2_PRST_N>,
> +                     <&src SKY1_USBC_SS2_RST_N>;
> +            reset-names = "usb_preset", "usb_reset";
> +
> +            clocks = <&scmi_clk CLK_TREE_USB3A_H0_CLK_SOF>,
> +                     <&scmi_clk CLK_TREE_USB3A_0_AXI_GATE>,
> +                     <&scmi_clk CLK_TREE_USB3A_H0_CLK_LPM>,
> +                     <&scmi_clk CLK_TREE_USB3A_0_APB_GATE>;
> +            clock-names = "sof_clk", "usb_aclk", "lpm_clk", "usb_pclk";
> +
> +            cix,usb_syscon = <&src>;
> +            axi_bmax_value = <0x7>;
> +
> +            usb-controller@91d0000 {
> +                compatible = "cdns,usb3";
> +                reg = <0x00 0x91d0000 0x00 0x4000>,
> +                      <0x00 0x91d8000 0x00 0x8000>,
> +                      <0x00 0x91d4000 0x00 0x4000>;
> +                reg-names = "otg", "xhci", "dev";
> +
> +                interrupts = <GIC_SPI 168 IRQ_TYPE_LEVEL_HIGH>,
> +                             <GIC_SPI 169 IRQ_TYPE_LEVEL_HIGH>,
> +                             <GIC_SPI 170 IRQ_TYPE_LEVEL_HIGH>,
> +                             <GIC_SPI 171 IRQ_TYPE_LEVEL_HIGH>;
> +                interrupt-names = "host", "peripheral", "otg", "wakeup";
> +
> +                /* Cadence USBSSP core properties - see cdns,usb3.yaml */
> +                maximum-speed = "super-speed-plus";
> +                dr_mode = "otg";
> +
> +                phys = <&usb3_phy4_0>, <&usb2_phy6>;
> +                phy-names = "cdns3,usb3-phy", "cdns3,usb2-phy";
> +            };
> +        };
> +    };
> diff --git a/MAINTAINERS b/MAINTAINERS
> index 15011f5752a9..4c5f6cbe9124 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -2775,8 +2775,11 @@ S:	Maintained
>  T:	git git://git.kernel.org/pub/scm/linux/kernel/git/peter.chen/cix.git
>  F:	Documentation/devicetree/bindings/arm/cix.yaml
>  F:	Documentation/devicetree/bindings/mailbox/cix,sky1-mbox.yaml
> +F:	Documentation/devicetree/bindings/phy/cix,sky1-usb3-phy.yaml
> +F:	Documentation/devicetree/bindings/usb/cix,sky1-usbssp.yaml
>  F:	arch/arm64/boot/dts/cix/
>  F:	drivers/mailbox/cix-mailbox.c
> +F:	drivers/phy/cix/
>  K:	\bcix\b
>  
>  ARM/CLKDEV SUPPORT
> -- 
> 2.54.0
> 

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