linux-kernel - Re: [PATCH] dt-bindings: phy: convert Qualcomm USB HS phy to yaml

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Message-ID: <Ycx/6gXhd6hnYJqP@ripper>
Date:   Wed, 29 Dec 2021 07:34:02 -0800
From:   Bjorn Andersson <bjorn.andersson@...aro.org>
To:     David Heidelberg <david@...t.cz>
Cc:     Andy Gross <agross@...nel.org>,
        Kishon Vijay Abraham I <kishon@...com>,
        Vinod Koul <vkoul@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        ~okias/devicetree@...ts.sr.ht, linux-arm-msm@...r.kernel.org,
        linux-phy@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] dt-bindings: phy: convert Qualcomm USB HS phy to yaml

On Fri 24 Dec 09:02 PST 2021, David Heidelberg wrote:

> Conversion of Qualcomm USB HS phy documentation to yaml.
> 
> Signed-off-by: David Heidelberg <david@...t.cz>

Very nice to see your efforts in this area David!

Just some minor nits below.

[..]
> diff --git a/Documentation/devicetree/bindings/phy/qcom,usb-hs-phy.yaml b/Documentation/devicetree/bindings/phy/qcom,usb-hs-phy.yaml
> new file mode 100644
> index 000000000000..202c42754188
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/phy/qcom,usb-hs-phy.yaml
> @@ -0,0 +1,86 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/phy/qcom,usb-hs-phy.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Qualcomm's USB HS PHY binding description
> +
> +maintainers:
> +  - Bjorn Andersson <bjorn.andersson@...aro.org>
> +
> +properties:
> +  compatible:
> +    items:
> +      - enum:
> +          - qcom,usb-hs-phy-apq8064
> +          - qcom,usb-hs-phy-msm8916
> +          - qcom,usb-hs-phy-msm8974
> +      - const: qcom,usb-hs-phy
> +
> +  clocks: true
> +
> +  clock-names:
> +    oneOf:
> +      - items:
> +          - const: ref
> +          - const: sleep
> +      - items:
> +          - const: sleep
> +          - const: ref

Can't we just pick one of them?

> +
> +  resets: true
> +
> +  reset-names:
> +    oneOf:
> +      - items:
> +          - const: por
> +      - items:
> +          - const: phy
> +          - const: por

How about doing the:

items:
  - const: por
  - const: phy
minItems: 1

> +
> +  v1p8-supply: true
> +
> +  v3p3-supply: true
> +
> +  extcon: true
> +
> +  "#phy-cells":
> +    const: 0
> +
> +  qcom,init-seq:
> +    $ref: /schemas/types.yaml#/definitions/uint8-array

It's better to use the uint8-matrix, as that allows you to describe the
value pairs as well. See e.g. st,adc-diff-channels in
iio/adc/st,stm32-adc.yaml as an example.

> +    description: |

I think you can omit the '|'.

Regards,
Bjorn

> +      Should contain a sequence of ULPI address and value pairs to
> +      program into the ULPI_EXT_VENDOR_SPECIFIC area. This is related
> +      to Device Mode Eye Diagram test. The addresses are offsets
> +      from the ULPI_EXT_VENDOR_SPECIFIC address, for example,
> +      <0x1 0x53> would mean "write the value 0x53 to address 0x81".
> +
> +required:
> +  - clocks
> +  - clock-names
> +  - resets
> +  - reset-names
> +  - "#phy-cells"
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    otg: usb-controller {
> +      ulpi {
> +        phy {
> +          compatible = "qcom,usb-hs-phy-msm8974", "qcom,usb-hs-phy";
> +          #phy-cells = <0>;
> +          clocks = <&clk 0>, <&clk 258>;
> +          clock-names = "ref", "sleep";
> +          resets = <&gcc 10>, <&otg 0>;
> +          reset-names = "phy", "por";
> +          v3p3-supply = <&pm8941_l24>;
> +          v1p8-supply = <&pm8941_l6>;
> +          extcon = <&smbb>;
> +          qcom,init-seq = /bits/ 8 <0x1 0x63>;
> +        };
> +      };
> +    };
> -- 
> 2.34.1
>