linux-kernel - Re: [PATCH v6 2/2] devicetree: bindings: phy: Document ipq806x dwc3 qcom phy

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Date:   Wed, 10 Jun 2020 14:26:38 -0600
From:   Rob Herring <robh@...nel.org>
To:     Ansuel Smith <ansuelsmth@...il.com>
Cc:     Bjorn Andersson <bjorn.andersson@...aro.org>,
        Andy Gross <agross@...nel.org>,
        Kishon Vijay Abraham I <kishon@...com>,
        Mark Rutland <mark.rutland@....com>,
        linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org
Subject: Re: [PATCH v6 2/2] devicetree: bindings: phy: Document ipq806x dwc3
 qcom phy

On Wed, Jun 03, 2020 at 03:22:35PM +0200, Ansuel Smith wrote:
> Document dwc3 qcom phy hs and ss phy bindings needed to correctly
> inizialize and use usb on ipq806x SoC.
> 
> Signed-off-by: Ansuel Smith <ansuelsmth@...il.com>
> ---
> v6:
> * Add maximum value
> v5:
> * Fix dt_binding_check error
> v4:
> * Add qcom to specific bindings
> v3:
> * Use explicit reg instead of regmap
> 
>  .../bindings/phy/qcom,ipq806x-usb-phy-hs.yaml | 58 ++++++++++++++
>  .../bindings/phy/qcom,ipq806x-usb-phy-ss.yaml | 76 +++++++++++++++++++
>  2 files changed, 134 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/phy/qcom,ipq806x-usb-phy-hs.yaml
>  create mode 100644 Documentation/devicetree/bindings/phy/qcom,ipq806x-usb-phy-ss.yaml
> 
> diff --git a/Documentation/devicetree/bindings/phy/qcom,ipq806x-usb-phy-hs.yaml b/Documentation/devicetree/bindings/phy/qcom,ipq806x-usb-phy-hs.yaml
> new file mode 100644
> index 000000000000..c019de7478e3
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/phy/qcom,ipq806x-usb-phy-hs.yaml
> @@ -0,0 +1,58 @@
> +# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/phy/qcom,ipq806x-usb-phy-hs.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Qualcomm ipq806x usb DWC3 HS PHY CONTROLLER
> +
> +maintainers:
> +  - Ansuel Smith <ansuelsmth@...il.com>
> +
> +description:
> +  DWC3 PHY nodes are defined to describe on-chip Synopsis Physical layer
> +  controllers used in ipq806x. Each DWC3 PHY controller should have its
> +  own node.
> +
> +properties:
> +  compatible:
> +    const: qcom,ipq806x-usb-phy-hs
> +
> +  "#phy-cells":
> +    const: 0
> +
> +  reg:
> +    maxItems: 1
> +
> +  clocks:
> +    minItems: 1
> +    maxItems: 2
> +
> +  clock-names:
> +    minItems: 1
> +    maxItems: 2
> +    description: |
> +      - "ref" Is required
> +      - "xo"	Optional external reference clock

This is just saying what the schema says. Drop it.

> +    items:
> +      - const: ref
> +      - const: xo
> +
> +required:
> +  - compatible
> +  - "#phy-cells"
> +  - reg
> +  - clocks
> +  - clock-names
> +
> +examples:
> +  - |
> +    #include <dt-bindings/clock/qcom,gcc-ipq806x.h>
> +
> +    hs_phy_0: phy@...f8800 {
> +      compatible = "qcom,ipq806x-usb-phy-hs";
> +      reg = <0x110f8800 0x30>;
> +      clocks = <&gcc USB30_0_UTMI_CLK>;
> +      clock-names = "ref";
> +      #phy-cells = <0>;
> +    };
> diff --git a/Documentation/devicetree/bindings/phy/qcom,ipq806x-usb-phy-ss.yaml b/Documentation/devicetree/bindings/phy/qcom,ipq806x-usb-phy-ss.yaml
> new file mode 100644
> index 000000000000..3696a8d7a5c7
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/phy/qcom,ipq806x-usb-phy-ss.yaml
> @@ -0,0 +1,76 @@
> +# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/phy/qcom,ipq806x-usb-phy-ss.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Qualcomm ipq806x usb DWC3 SS PHY CONTROLLER
> +
> +maintainers:
> +  - Ansuel Smith <ansuelsmth@...il.com>
> +
> +description:
> +  DWC3 PHY nodes are defined to describe on-chip Synopsis Physical layer
> +  controllers used in ipq806x. Each DWC3 PHY controller should have its
> +  own node.
> +
> +properties:
> +  compatible:
> +    const: qcom,ipq806x-usb-phy-ss
> +
> +  "#phy-cells":
> +    const: 0
> +
> +  reg:
> +    maxItems: 1
> +
> +  clocks:
> +    minItems: 1
> +    maxItems: 2
> +
> +  clock-names:
> +    minItems: 1
> +    maxItems: 2
> +    items:
> +      - const: ref
> +      - const: xo
> +
> +  qcom,rx-eq:
> +    description: Override value for rx_eq.
> +    default: 4
> +    maximum: 7
> +    allOf:

You can drop 'allOf' now and just do $ref directly.

> +      - $ref: /schemas/types.yaml#/definitions/uint32
> +
> +  qcom,tx-deamp-3_5db:
> +    description: Override value for transmit preemphasis.
> +    default: 23
> +    maximum: 63
> +    allOf:
> +      - $ref: /schemas/types.yaml#/definitions/uint32
> +
> +  qcom,mpll:
> +    description: Override value for mpll.
> +    default: 0
> +    maximum: 7
> +    allOf:
> +      - $ref: /schemas/types.yaml#/definitions/uint32
> +
> +required:
> +  - compatible
> +  - "#phy-cells"
> +  - reg
> +  - clocks
> +  - clock-names
> +
> +examples:
> +  - |
> +    #include <dt-bindings/clock/qcom,gcc-ipq806x.h>
> +
> +    ss_phy_0: phy@...f8830 {
> +      compatible = "qcom,ipq806x-usb-phy-ss";
> +      reg = <0x110f8830 0x30>;
> +      clocks = <&gcc USB30_0_MASTER_CLK>;
> +      clock-names = "ref";
> +      #phy-cells = <0>;
> +    };
> -- 
> 2.25.1
>