linux-kernel - Re: [PATCH v7 1/2] dt-bindings: usb: dwc3: add support for SpacemiT K1

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Message-ID: <aIgmrQ7afSO5sjB_@pie>
Date: Tue, 29 Jul 2025 01:41:01 +0000
From: Yao Zi <ziyao@...root.org>
To: Ze Huang <huang.ze@...ux.dev>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>, Yixun Lan <dlan@...too.org>,
	Thinh Nguyen <Thinh.Nguyen@...opsys.com>,
	Philipp Zabel <p.zabel@...gutronix.de>
Cc: linux-usb@...r.kernel.org, devicetree@...r.kernel.org,
	linux-riscv@...ts.infradead.org, spacemit@...ts.linux.dev,
	linux-kernel@...r.kernel.org,
	Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Subject: Re: [PATCH v7 1/2] dt-bindings: usb: dwc3: add support for SpacemiT
 K1

On Tue, Jul 29, 2025 at 12:33:55AM +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@...aro.org>
> Signed-off-by: Ze Huang <huang.ze@...ux.dev>
> ---
>  .../devicetree/bindings/usb/spacemit,k1-dwc3.yaml  | 124 +++++++++++++++++++++
>  1 file changed, 124 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..7007e2bd42016ae0e50c4007e75d26bada34d983
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/usb/spacemit,k1-dwc3.yaml
> @@ -0,0 +1,124 @@

...

> +  resets:
> +    items:
> +      - description: USB3.0 AHB reset
> +      - description: USB3.0 VCC reset
> +      - description: USB3.0 PHY reset
> +      - description: PCIE0 global reset (for combo phy)

Why should the USB driver takes care of the PCIe stuff? This sounds
strange to me.

> +  reset-names:
> +    items:
> +      - const: ahb
> +      - const: vcc
> +      - const: phy
> +      - const: pcie0

Best regards,
Yao Zi