linux-kernel - Re: [PATCH v3 1/5] dt-bindings: phy: Add StarFive JH7110 USB/PCIe document

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Date:   Fri, 17 Mar 2023 09:39:14 +0100
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Minda Chen <minda.chen@...rfivetech.com>,
        Emil Renner Berthing <emil.renner.berthing@...onical.com>,
        Conor Dooley <conor@...nel.org>, Vinod Koul <vkoul@...nel.org>,
        Kishon Vijay Abraham I <kishon@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Pawel Laszczak <pawell@...ence.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Peter Chen <peter.chen@...nel.org>,
        Roger Quadros <rogerq@...nel.org>,
        Philipp Zabel <p.zabel@...gutronix.de>
Cc:     devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-phy@...ts.infradead.org, linux-usb@...r.kernel.org,
        linux-riscv@...ts.infradead.org,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>
Subject: Re: [PATCH v3 1/5] dt-bindings: phy: Add StarFive JH7110 USB/PCIe
 document

On 15/03/2023 11:44, Minda Chen wrote:
> Add StarFive JH7110 SoC USB 2.0/3.0 and PCIe 2.0 PHY dt-binding.
> PCIe 2.0 phy can use as USB 3.0 PHY.
> 
> Signed-off-by: Minda Chen <minda.chen@...rfivetech.com>
> ---
>  .../phy/starfive,jh7110-usb-pcie-phy.yaml     | 62 +++++++++++++++++++
>  1 file changed, 62 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/phy/starfive,jh7110-usb-pcie-phy.yaml
> 
> diff --git a/Documentation/devicetree/bindings/phy/starfive,jh7110-usb-pcie-phy.yaml b/Documentation/devicetree/bindings/phy/starfive,jh7110-usb-pcie-phy.yaml
> new file mode 100644
> index 000000000000..aa1c3fe93100
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/phy/starfive,jh7110-usb-pcie-phy.yaml
> @@ -0,0 +1,62 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/phy/starfive,jh7110-usb-pcie-phy.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: StarFive USB 2.0 and PCIe 2.0 PHY
> +
> +maintainers:
> +  - Minda Chen <minda.chen@...rfivetech.com>
> +
> +properties:
> +  compatible:
> +    enum:
> +      - starfive,jh7110-usb-phy
> +      - starfive,jh7110-pcie-phy
> +
> +  reg:
> +    maxItems: 1
> +
> +  "#phy-cells":
> +    const: 0
> +
> +  clocks:
> +    items:
> +      - description: usb 125m clock
> +      - description: app 125m clock
> +
> +  clock-names:
> +    items:
> +      - const: 125m
> +      - const: app_125
> +
> +required:
> +  - compatible
> +  - reg
> +  - "#phy-cells"
> +

It seems pci phy does not take these clocks, thus you should have
allOf:if:then which will customize it per variant. Otherwise binding is
incorrect for the pci.

> +additionalProperties: false
> +
> +examples:
> +  - |
> +    phy@...00000 {
> +      compatible = "starfive,jh7110-usb-phy";
> +      reg = <0x10200000 0x10000>;
> +      clocks = <&syscrg 95>,
> +               <&stgcrg 6>;
> +      clock-names = "125m", "app_125";
> +      #phy-cells = <0>;
> +    };
> +
> +    phy@...10000 {
> +      compatible = "starfive,jh7110-pcie-phy";
> +      reg = <0x10210000 0x10000>;
> +      #phy-cells = <0>;
> +    };
> +
> +    phy@...20000 {
> +      compatible = "starfive,jh7110-pcie-phy";
> +      reg = <0x10220000 0x10000>;
> +      #phy-cells = <0>;
> +    };

Drop duplicated examples. Keep usb and maybe one phy.

Best regards,
Krzysztof