linux-kernel - Re: [PATCH v3 1/2] dt-bindings: usb: Add ESWIN EIC7700 USB controller

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Message-ID: <20250915-affair-halves-4f881f6c7cdb@spud>
Date: Mon, 15 Sep 2025 18:34:27 +0100
From: Conor Dooley <conor@...nel.org>
To: caohang@...incomputing.com
Cc: gregkh@...uxfoundation.org, robh@...nel.org, krzk+dt@...nel.org,
	conor+dt@...nel.org, Thinh.Nguyen@...opsys.com,
	p.zabel@...gutronix.de, linux-kernel@...r.kernel.org,
	linux-usb@...r.kernel.org, devicetree@...r.kernel.org,
	ningyu@...incomputing.com, linmin@...incomputing.com,
	pinkesh.vaghela@...fochips.com,
	Senchuan Zhang <zhangsenchuan@...incomputing.com>
Subject: Re: [PATCH v3 1/2] dt-bindings: usb: Add ESWIN EIC7700 USB controller

On Mon, Sep 15, 2025 at 05:10:24PM +0800, caohang@...incomputing.com wrote:
> From: Hang Cao <caohang@...incomputing.com>
> 
> Add Device Tree binding documentation for the ESWIN EIC7700
> usb controller module.
> 
> Signed-off-by: Senchuan Zhang <zhangsenchuan@...incomputing.com>
> Signed-off-by: Hang Cao <caohang@...incomputing.com>
> ---
>  .../bindings/usb/eswin,eic7700-usb.yaml       | 99 +++++++++++++++++++
>  1 file changed, 99 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/usb/eswin,eic7700-usb.yaml
> 
> diff --git a/Documentation/devicetree/bindings/usb/eswin,eic7700-usb.yaml b/Documentation/devicetree/bindings/usb/eswin,eic7700-usb.yaml
> new file mode 100644
> index 000000000000..37797b85f417
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/usb/eswin,eic7700-usb.yaml
> @@ -0,0 +1,99 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/usb/eswin,eic7700-usb.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: ESWIN EIC7700 SoC Usb Controller
> +
> +maintainers:
> +  - Wei Yang <yangwei1@...incomputing.com>
> +  - Senchuan Zhang <zhangsenchuan@...incomputing.com>
> +  - Hang Cao <caohang@...incomputing.com>
> +
> +description:
> +  The Usb controller on EIC7700 SoC.
> +
> +allOf:
> +  - $ref: snps,dwc3-common.yaml#
> +
> +properties:
> +  compatible:
> +    const: eswin,eic7700-dwc3
> +
> +  reg:
> +    maxItems: 1
> +
> +  interrupts:
> +    maxItems: 1
> +
> +  interrupt-names:
> +    items:
> +      - const: peripheral
> +
> +  clocks:
> +    maxItems: 2
> +
> +  clock-names:
> +    items:
> +      - const: aclk
> +      - const: cfg
> +
> +  resets:
> +    maxItems: 1
> +
> +  reset-names:
> +    items:
> +      - const: vaux
> +
> +  eswin,hsp-sp-csr:
> +    description:
> +      HSP CSR is to control and get status of different high-speed peripherals
> +      (such as Ethernet, USB, SATA, etc.) via register, which can close
> +      module's clock,reset module independently and tune board-level's
> +      parameters of PHY, etc.
> +    $ref: /schemas/types.yaml#/definitions/phandle-array
> +    items:
> +      - items:
> +          - description: phandle to HSP Register Controller hsp_sp_csr node.
> +          - description: usb bus register offset.
> +          - description: axi low power register offset.
> +          - description: vbus frequency register offset.
> +          - description: mpll register offset.

As I mentioned on the shdci binding patch, I'm not happy with the
justification for this phandle. What exactly is the clock that this
controls and why does it not have a dedicated clock-controller driver
and reset-controller driver?

> +
> +required:
> +  - compatible
> +  - reg
> +  - clocks
> +  - clock-names
> +  - interrupts
> +  - interrupt-names
> +  - resets
> +  - reset-names
> +  - eswin,hsp-sp-csr
> +
> +unevaluatedProperties: false
> +
> +examples:
> +  - |
> +    usb@...80000 {
> +        compatible = "eswin,eic7700-dwc3";
> +        reg = <0x50480000 0x10000>;
> +        clocks = <&clock 170>,
> +                 <&clock 171>;
> +        clock-names = "aclk", "cfg";
> +        interrupt-parent = <&plic>;
> +        interrupts = <85>;
> +        interrupt-names = "peripheral";
> +        resets = <&reset 84>;
> +        reset-names = "vaux";
> +        dr_mode = "peripheral";
> +        maximum-speed = "high-speed";
> +        phy_type = "utmi";
> +        snps,dis_enblslpm_quirk;
> +        snps,dis-u2-freeclk-exists-quirk;
> +        snps,dis_u2_susphy_quirk;
> +        snps,dis-del-phy-power-chg-quirk;
> +        snps,parkmode-disable-ss-quirk;
> +        eswin,hsp-sp-csr = <&hsp_sp_csr 0x800 0x818 0x83c 0x840>;
> +    };
> -- 
> 2.34.1
> 

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