linux-kernel - Re: [PATCH v2 07/11] dt-bindings: phy: Add documentation for Airoha AN7581 USB PHY

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Message-ID: <20250324154919.GA101272-robh@kernel.org>
Date: Mon, 24 Mar 2025 10:49:19 -0500
From: Rob Herring <robh@...nel.org>
To: Christian Marangi <ansuelsmth@...il.com>
Cc: Michael Turquette <mturquette@...libre.com>,
	Stephen Boyd <sboyd@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>, Vinod Koul <vkoul@...nel.org>,
	Kishon Vijay Abraham I <kishon@...nel.org>,
	Matthias Brugger <matthias.bgg@...il.com>,
	AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>,
	Lorenzo Bianconi <lorenzo@...nel.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Daniel Danzberger <dd@...edd.com>, Arnd Bergmann <arnd@...db.de>,
	Alexander Sverdlin <alexander.sverdlin@...il.com>,
	Nikita Shubin <nikita.shubin@...uefel.me>,
	Linus Walleij <linus.walleij@...aro.org>,
	Yangyu Chen <cyy@...self.name>, Ben Hutchings <ben@...adent.org.uk>,
	Felix Fietkau <nbd@....name>, linux-clk@...r.kernel.org,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, linux-phy@...ts.infradead.org,
	linux-mediatek@...ts.infradead.org, linux-usb@...r.kernel.org,
	upstream@...oha.com
Subject: Re: [PATCH v2 07/11] dt-bindings: phy: Add documentation for Airoha
 AN7581 USB PHY

On Thu, Mar 20, 2025 at 02:00:30PM +0100, Christian Marangi wrote:
> Add documentation for Airoha AN7581 USB PHY that describe the USB PHY
> for the USB controller.
> 
> Airoha AN7581 SoC support a maximum of 2 USB port. The USB 2.0 mode is
> always supported. The USB 3.0 mode is optional and depends on the Serdes
> mode currently configured on the system for the USB port.
> 
> If the airoha,serdes-port property is not declared, it's assumed USB 3.0
> mode is not supported, as the Serdes mode can't be validated.
> 
> Signed-off-by: Christian Marangi <ansuelsmth@...il.com>
> ---
>  .../bindings/phy/airoha,an7581-usb-phy.yaml   | 83 +++++++++++++++++++
>  MAINTAINERS                                   |  7 ++
>  .../dt-bindings/phy/airoha,an7581-usb-phy.h   | 11 +++
>  3 files changed, 101 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/phy/airoha,an7581-usb-phy.yaml
>  create mode 100644 include/dt-bindings/phy/airoha,an7581-usb-phy.h
> 
> diff --git a/Documentation/devicetree/bindings/phy/airoha,an7581-usb-phy.yaml b/Documentation/devicetree/bindings/phy/airoha,an7581-usb-phy.yaml
> new file mode 100644
> index 000000000000..39ceaded5d0e
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/phy/airoha,an7581-usb-phy.yaml
> @@ -0,0 +1,83 @@
> +# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/phy/airoha,an7581-usb-phy.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Airoha AN7581 SoC USB PHY
> +
> +maintainers:
> +  - Christian Marangi <ansuelsmth@...il.com>
> +
> +description: >
> +  The Airoha AN7581 SoC USB PHY describes the USB PHY for the USB controller.
> +
> +  Airoha AN7581 SoC support a maximum of 2 USB port. The USB 2.0 mode is
> +  always supported. The USB 3.0 mode is optional and depends on the Serdes
> +  mode currently configured on the system for the USB port.
> +
> +  If the airoha,serdes-port property is not declared, it's assumed USB 3.0
> +  mode is not supported, as the Serdes mode can't be validated.
> +
> +properties:
> +  compatible:
> +    const: airoha,an7581-usb-phy
> +
> +  reg:
> +    maxItems: 1
> +
> +
> +  airoha,usb2-monitor-clk-sel:
> +    description: Describe what oscillator across the available 4
> +      should be selected for USB 2.0 Slew Rate calibration.
> +    $ref: /schemas/types.yaml#/definitions/uint32
> +    enum: [0, 1, 2, 3]
> +
> +  airoha,serdes-port:
> +    description: Describe what Serdes Port is attached to the USB 3.0 port.
> +    $ref: /schemas/types.yaml#/definitions/uint32
> +    enum: [0, 1, 2, 3]

Since you only have a single value here, does that mean only only one of 
the 2 ports/phys supports USB3?

> +
> +  airoha,scu:
> +    description: Phandle to the SCU node for USB 3.0 Serdes mode validation.
> +    $ref: /schemas/types.yaml#/definitions/phandle

A bit unusual, but you could use the phys binding here instead of these 
2 properties. The phy for the phy...

> +
> +  '#phy-cells':
> +    const: 1

Please add a description of what's in the cell.

> +
> +required:
> +  - compatible
> +  - reg
> +  - airoha,usb2-monitor-clk-sel
> +  - '#phy-cells'
> +
> +dependentRequired:
> +  airoha,serdes-port: [ 'airoha,scu' ]
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    #include <dt-bindings/phy/airoha,an7581-usb-phy.h>
> +    #include <dt-bindings/soc/airoha,scu-ssr.h>
> +
> +    phy@...c0000 {
> +        compatible = "airoha,an7581-usb-phy";
> +        reg = <0x1fac0000 0x10000>;
> +
> +        airoha,usb2-monitor-clk-sel = <AIROHA_USB2_MONCLK_SEL1>;
> +        airoha,scu = <&scu>;
> +        airoha,serdes-port = <AIROHA_SCU_SERDES_USB1>;
> +
> +        #phy-cells = <1>;
> +    };
> +
> +    phy@...e0000 {
> +        compatible = "airoha,an7581-usb-phy";
> +        reg = <0x1fae0000 0x10000>;
> +
> +        airoha,usb2-monitor-clk-sel = <AIROHA_USB2_MONCLK_SEL2>;
> +
> +        #phy-cells = <1>;
> +    };

Drop the 2nd example.

Rob