linux-kernel - Re: [PATCH v2 1/2] dt-bindings: phy: Add Sophgo CV1800 USB phy

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Date: Tue, 30 Apr 2024 18:09:20 +0100
From: Conor Dooley <conor@...nel.org>
To: Inochi Amaoto <inochiama@...look.com>
Cc: Vinod Koul <vkoul@...nel.org>,
	Kishon Vijay Abraham I <kishon@...nel.org>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Chen Wang <unicorn_wang@...look.com>,
	Jisheng Zhang <jszhang@...nel.org>,
	Liu Gui <kenneth.liu@...hgo.com>,
	Jingbao Qiu <qiujingbao.dlmu@...il.com>, dlan@...too.org,
	linux-phy@...ts.infradead.org, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 1/2] dt-bindings: phy: Add Sophgo CV1800 USB phy

On Mon, Apr 29, 2024 at 08:31:11AM +0800, Inochi Amaoto wrote:
> The USB phy of Sophgo CV18XX series SoC needs to sense a pin called
> "VBUS_DET" to get the right operation mode. If this pin is not
> connected, it only supports setting the mode manually.
> 
> Add USB phy bindings for Sophgo CV18XX/SG200X series SoC.
> 
> Signed-off-by: Inochi Amaoto <inochiama@...look.com>
> ---
>  .../bindings/phy/sophgo,cv1800-usb-phy.yaml   | 68 +++++++++++++++++++
>  1 file changed, 68 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/phy/sophgo,cv1800-usb-phy.yaml
> 
> diff --git a/Documentation/devicetree/bindings/phy/sophgo,cv1800-usb-phy.yaml b/Documentation/devicetree/bindings/phy/sophgo,cv1800-usb-phy.yaml
> new file mode 100644
> index 000000000000..7e3382c18d44
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/phy/sophgo,cv1800-usb-phy.yaml
> @@ -0,0 +1,68 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/phy/sophgo,cv1800-usb-phy.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Sophgo CV18XX/SG200X USB 2.0 PHY
> +
> +maintainers:
> +  - Inochi Amaoto <inochiama@...look.com>
> +
> +properties:
> +  compatible:
> +    const: sophgo,cv1800-usb-phy
> +
> +  reg:
> +    maxItems: 1
> +
> +  "#phy-cells":
> +    const: 0
> +
> +  clocks:
> +    items:
> +      - description: PHY clock
> +      - description: PHY app clock
> +      - description: PHY stb clock
> +      - description: PHY lpm clock
> +
> +  clock-names:
> +    items:
> +      - const: phy
> +      - const: app
> +      - const: stb
> +      - const: lpm
> +
> +  vbus_det-gpios:

"vbus_det-gpios" isn't a common property AFAICT, why does it not get a
vendor prefix when the other gpios property does?

> +    description: GPIO to the USB OTG VBUS detect pin. This should not be
> +      defined if vbus_det pin and switch pin are connected, which may
> +      break the VBUS detection.
> +    maxItems: 1
> +
> +  sophgo,switch-gpios:
> +    description: GPIO array for the phy to control connected switch. For
> +      host mode, the driver will set these GPIOs to low one by one. For
> +      device mode, the driver will set these GPIOs to high in reverse
> +      order.
> +    maxItems: 2

You're still missing the itemised description of what each of the gpios
here are - how would I know which order to put the GPIOs in?

Cheers,
Conor.

> +
> +required:
> +  - compatible
> +  - "#phy-cells"
> +  - clocks
> +  - clock-names
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    phy@48 {
> +      compatible = "sophgo,cv1800-usb-phy";
> +      reg = <0x48 0x4>;
> +      #phy-cells = <0>;
> +      clocks = <&clk 92>, <&clk 93>,
> +               <&clk 94>, <&clk 95>;
> +      clock-names = "phy", "app", "stb", "lpm";
> +    };
> +
> +...
> --
> 2.44.0
> 

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