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

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Message-ID: <20200414173838.GA29176@bogus>
Date:   Tue, 14 Apr 2020 12:38:38 -0500
From:   Rob Herring <robh@...nel.org>
To:     Ansuel Smith <ansuelsmth@...il.com>
Cc:     Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.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 2/2] devicetree: bindings: phy: Document dwc3 qcom phy

On Fri, Apr 03, 2020 at 02:26:05AM +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>
> ---
>  .../bindings/phy/qcom,dwc3-hs-usb-phy.yaml    | 65 +++++++++++++++++++
>  .../bindings/phy/qcom,dwc3-ss-usb-phy.yaml    | 65 +++++++++++++++++++
>  2 files changed, 130 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/phy/qcom,dwc3-hs-usb-phy.yaml
>  create mode 100644 Documentation/devicetree/bindings/phy/qcom,dwc3-ss-usb-phy.yaml
> 
> diff --git a/Documentation/devicetree/bindings/phy/qcom,dwc3-hs-usb-phy.yaml b/Documentation/devicetree/bindings/phy/qcom,dwc3-hs-usb-phy.yaml
> new file mode 100644
> index 000000000000..0bb59e3c2ab8
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/phy/qcom,dwc3-hs-usb-phy.yaml
> @@ -0,0 +1,65 @@
> +# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/phy/qcom,dwc3-hs-usb-phy.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Qualcomm DWC3 HS PHY CONTROLLER
> +
> +maintainers:
> +  - Ansuel Smith <ansuelsmth@...il.com>
> +
> +description:
> +  DWC3 PHY nodes are defined to describe on-chip Synopsis Physical layer
> +  controllers. Each DWC3 PHY controller should have its own node.
> +
> +properties:
> +  compatible:
> +    const: qcom,dwc3-hs-usb-phy
> +
> +  "#phy-cells":
> +    const: 0
> +
> +  regmap:
> +    maxItems: 1
> +    description: phandle to usb3 dts definition
> +
> +  clocks:
> +    minItems: 1
> +    maxItems: 2
> +
> +  clock-names:
> +    minItems: 1
> +    maxItems: 2
> +    description: |
> +      - "ref" Is required
> +      - "xo"	Optional external reference clock
> +    items:
> +      - const: ref
> +      - const: xo
> +
> +required:
> +  - compatible
> +  - "#phy-cells"
> +  - regmap
> +  - clocks
> +  - clock-names
> +
> +examples:
> +  - |
> +    #include <dt-bindings/clock/qcom,gcc-ipq806x.h>
> +
> +    hs_phy_0: hs_phy_0 {
> +      compatible = "qcom,dwc3-hs-usb-phy";
> +      regmap = <&usb3_0>;

If the registers for the phy are part of 'qcom,dwc3' then make this node 
a child of it.

> +      clocks = <&gcc USB30_0_UTMI_CLK>;
> +      clock-names = "ref";
> +      #phy-cells = <0>;
> +    };
> +
> +    usb3_0: usb3@...f8800 {
> +      compatible = "qcom,dwc3", "syscon";
> +      reg = <0x110f8800 0x8000>;
> +
> +      /* ... */

Incomplete examples should or will fail validation.

> +    };