linux-kernel - Re: [PATCH 1/2] dt-bindings: phy: Add YAML schemas for Intel Combo phy

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Date:   Wed, 8 Jan 2020 08:18:55 -0600
From:   Rob Herring <robh@...nel.org>
To:     Dilip Kota <eswara.kota@...ux.intel.com>
Cc:     linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
        kishon@...com, andriy.shevchenko@...el.com,
        cheol.yong.kim@...el.com, chuanhua.lei@...ux.intel.com,
        qi-ming.wu@...el.com, yixin.zhu@...el.com
Subject: Re: [PATCH 1/2] dt-bindings: phy: Add YAML schemas for Intel Combo
 phy

On Fri, Dec 20, 2019 at 03:28:27PM +0800, Dilip Kota wrote:
> Combo phy subsystem provides PHY support to number of
> controllers, viz. PCIe, SATA and EMAC.
> Adding YAML schemas for the same.
> 
> Signed-off-by: Dilip Kota <eswara.kota@...ux.intel.com>
> ---
>  .../devicetree/bindings/phy/intel,combo-phy.yaml   | 147 +++++++++++++++++++++
>  1 file changed, 147 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/phy/intel,combo-phy.yaml
> 
> diff --git a/Documentation/devicetree/bindings/phy/intel,combo-phy.yaml b/Documentation/devicetree/bindings/phy/intel,combo-phy.yaml
> new file mode 100644
> index 000000000000..fc9cbad9dd88
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/phy/intel,combo-phy.yaml
> @@ -0,0 +1,147 @@
> +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/phy/intel,combo-phy.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Intel Combo phy Subsystem
> +
> +maintainers:
> +  - Dilip Kota <eswara.kota@...ux.intel.com>
> +
> +description: |
> +  Intel combo phy subsystem supports PHYs for PCIe, EMAC and SATA
> +  controllers. A single combo phy provides two PHY instances.
> +
> +properties:
> +  $nodename:
> +    pattern: "^combophy@[0-9]+$"
> +
> +  compatible:
> +    items:
> +      - const: intel,combo-phy
> +      - const: simple-bus

This will cause the schema to be applied to every 'simple-bus'. You need 
a custom 'select' to prevent that. There's several examples in the tree.

Though I'm not sure you need child nodes here.

> +
> +  cell-index:
> +    $ref: /schemas/types.yaml#/definitions/uint32
> +    description: Index of Combo phy hardware instance.

Drop this. Not used for FDT.

> +
> +  resets:
> +    maxItems: 2
> +
> +  reset-names:
> +    items:
> +      - const: phy
> +      - const: core
> +
> +  intel,syscfg:
> +    $ref: /schemas/types.yaml#/definitions/phandle
> +    description: Chip configuration registers handle
> +
> +  intel,hsio:
> +    $ref: /schemas/types.yaml#/definitions/phandle
> +    description: HSIO registers handle
> +
> +  intel,bid:
> +    description: Index of HSIO bus
> +    allOf:
> +      - $ref: /schemas/types.yaml#/definitions/uint32
> +      - minimum: 0
> +      - maximum: 1

If this is related to intel,hsio, just make it an args cell for 
intel,hsio.

> +
> +  intel,cap-pcie-only:
> +    description: |
> +      This flag specifies capability of the combo phy.
> +      If it is set, combo phy has only PCIe capability.
> +      Else it has PCIe, XPCS and SATA PHY capabilities.
> +    type: boolean
> +
> +  "#address-cells":
> +    const: 1
> +
> +  "#size-cells":
> +    const: 1
> +
> +  ranges: true
> +
> +patternProperties:
> +  "^cb[0-9]phy@[0-9]+$":
> +    type: object
> +
> +    properties:
> +      compatible:
> +        const: intel,phydev
> +
> +      "#phy-cells":
> +        const: 0
> +
> +      reg:
> +        description: Offset and size of pcie phy control registers
> +
> +      intel,phy-mode:
> +        description: |
> +          Configure the mode of the PHY.
> +            0 - PCIe
> +            1 - xpcs
> +            2 - sata

PHY mode is normally a cell in the client's phys property. There's 
already common defines for this.

> +        allOf:
> +          - $ref: /schemas/types.yaml#/definitions/uint32
> +          - minimum: 0
> +          - maximum: 2
> +
> +      clocks:
> +        description: |
> +          List of phandle and clock specifier pairs as listed
> +          in clock-names property. Configure the clocks according
> +          to the PHY mode.
> +
> +      resets:
> +        description: |
> +          reset handle according to the PHY mode.
> +          See ../reset/reset.txt for details.
> +
> +    required:
> +      - compatible
> +      - reg
> +      - "#phy-cells"
> +      - clocks
> +      - intel,phy-mode
> +
> +required:
> +  - compatible
> +  - cell-index
> +  - "#address-cells"
> +  - "#size-cells"
> +  - ranges
> +  - intel,syscfg
> +  - intel,hsio
> +  - intel,bid
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    combophy@0 {
> +        compatible = "intel,combo-phy", "simple-bus";
> +        cell-index = <0>;
> +        #address-cells = <1>;
> +        #size-cells = <1>;
> +        ranges;
> +        resets = <&rcu0 0x50 6>,
> +        	 <&rcu0 0x50 17>;
> +        reset-names = "phy", "core";
> +        intel,syscfg = <&sysconf>;
> +        intel,hsio = <&hsiol>;
> +        intel,bid = <0>;
> +
> +        cb0phy0:cb0phy@0 {
> +            compatible = "intel,phydev";
> +            #phy-cells = <0>;
> +            reg = <0xd0a40000 0x1000>;
> +            clocks = <&cgu0 1>;
> +            resets = <&rcu0 0x50 23>;
> +            intel,phy-mode = <0>;
> +        };

If you only have 1 child, then you don't need a child node here. Is this 
example complete?

> +    };
> +
> +
> -- 
> 2.11.0
>