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Date:   Wed, 7 Jun 2023 20:31:50 +0200
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Subject: Re: [PATCH 2/9] dt-bindings: phy: qcom,m31: Document qcom,m31 USB phy
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To:     Varadarajan Narayanan <quic_varada@quicinc.com>, agross@kernel.org,
        andersson@kernel.org, konrad.dybcio@linaro.org, vkoul@kernel.org,
        kishon@kernel.org, robh+dt@kernel.org,
        krzysztof.kozlowski+dt@linaro.org, conor+dt@kernel.org,
        gregkh@linuxfoundation.org, catalin.marinas@arm.com,
        will@kernel.org, mturquette@baylibre.com, sboyd@kernel.org,
        p.zabel@pengutronix.de, arnd@arndb.de, geert+renesas@glider.be,
        neil.armstrong@linaro.org, nfraprado@collabora.com,
        broonie@kernel.org, rafal@milecki.pl, quic_srichara@quicinc.com,
        quic_varada@quicinc.org, quic_wcheng@quicinc.com,
        linux-arm-msm@vger.kernel.org, linux-phy@lists.infradead.org,
        devicetree@vger.kernel.org, linux-kernel@vger.kernel.org,
        linux-usb@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
        linux-clk@vger.kernel.org
References: <cover.1686126439.git.quic_varada@quicinc.com>
 <14f60578e2935c0844537eab162af3afa52ffe39.1686126439.git.quic_varada@quicinc.com>
From:   Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
In-Reply-To: <14f60578e2935c0844537eab162af3afa52ffe39.1686126439.git.quic_varada@quicinc.com>
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Precedence: bulk

On 07/06/2023 12:56, Varadarajan Narayanan wrote:
> Document the M31 USB2 phy present in IPQ5332

Full stop.

> 
> Signed-off-by: Sricharan Ramabadhran <quic_srichara@quicinc.com>
> Signed-off-by: Varadarajan Narayanan <quic_varada@quicinc.com>
> ---
>  .../devicetree/bindings/phy/qcom,m31.yaml          | 69 ++++++++++++++++++++++
>  1 file changed, 69 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/phy/qcom,m31.yaml
> 
> diff --git a/Documentation/devicetree/bindings/phy/qcom,m31.yaml b/Documentation/devicetree/bindings/phy/qcom,m31.yaml
> new file mode 100644
> index 0000000..8ad4ba4
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/phy/qcom,m31.yaml
> @@ -0,0 +1,69 @@
> +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
> +

Drop stray blank lines.

> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/phy/qcom,m31.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Qualcomm M31 USB PHY

What is M31?

> +
> +maintainers:
> +  - Sricharan Ramabadhran <quic_srichara@quicinc.com>
> +  - Varadarajan Narayanan <quic_varada@quicinc.org>
> +
> +description:
> +  This file contains documentation for the USB M31 PHY found in Qualcomm

Drop redundant parts ("This file contains documentation for the").

> +  IPQ5018, IPQ5332 SoCs.
> +
> +properties:
> +  compatible:
> +    oneOf:

That's not oneOf.

> +      - items:

No items.

> +          - enum:
> +              - qcom,m31-usb-hsphy

I am confused what's this. If m31 is coming from some IP block provider,
then you are using wrong vendor prefix.
https://www.m31tech.com/download_file/M31_USB.pdf


> +              - qcom,ipq5332-m31-usb-hsphy

This confuses me even more. IPQ m31?

> +
> +  reg:
> +    description:
> +      Offset and length of the M31 PHY register set

Drop description, obvious.

> +    maxItems: 2
> +
> +  reg-names:
> +    items:
> +      - const: m31usb_phy_base
> +      - const: qscratch_base

Drop "_base" from both.

> +
> +  phy_type:
> +    oneOf:
> +      - items:
> +          - enum:
> +              - utmi
> +              - ulpi

This does not belong to phy, but to USB node.

> +
> +  resets:
> +    maxItems: 1
> +    description:
> +      List of phandles and reset pairs, one for each entry in reset-names.

Drop useless description.

> +
> +  reset-names:
> +    items:
> +      - const:
> +          usb2_phy_reset

Drop entire reset-names.

> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    #include <dt-bindings/clock/qcom,ipq5332-gcc.h>
> +    hs_m31phy_0: hs_m31phy@5b00 {

Node names should be generic. See also explanation and list of examples
in DT specification:
https://devicetree-specification.readthedocs.io/en/latest/chapter2-devicetree-basics.html#generic-names-recommendation

Also, no underscores in node names.

> +        compatible = "qcom,m31-usb-hsphy";
> +        reg = <0x5b000 0x3000>,

This is not what your unit address is saying.

> +            <0x08af8800 0x400>;

Align it.

> +        reg-names = "m31usb_phy_base",
> +                "qscratch_base";

Align it.

> +        phy_type = "utmi";
> +        resets = <&gcc GCC_QUSB2_0_PHY_BCR>;
> +        reset-names = "usb2_phy_reset";
> +
> +        status = "ok";

Drop.

> +    };

Best regards,
Krzysztof