linux-kernel - Re: [PATCH v3 01/14] dt-bindings: phy: Convert Cadence MHDP PHY bindings to YAML.

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Date:   Mon, 27 Jan 2020 10:25:33 -0600
From:   Rob Herring <robh@...nel.org>
To:     Yuti Amonkar <yamonkar@...ence.com>
Cc:     linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
        kishon@...com, mark.rutland@....com, maxime@...no.tech,
        jsarha@...com, tomi.valkeinen@...com, praneeth@...com,
        mparab@...ence.com, sjakhade@...ence.com
Subject: Re: [PATCH v3 01/14] dt-bindings: phy: Convert Cadence MHDP PHY
 bindings to YAML.

On Wed, Jan 22, 2020 at 11:45:05AM +0100, Yuti Amonkar wrote:
> - Convert the MHDP PHY devicetree bindings to yaml schemas.
> - Rename DP PHY to have generic Torrent PHY nomrnclature.
> - Add Torrent PHY reference clock bindings.
> - Rename compatible string from "cdns,dp-phy" to "cdns,torrent-phy".
>   This will not affect ABI as the driver has never been functional,
>   and therefore do not exist in any active use case
> 
> Signed-off-by: Yuti Amonkar <yamonkar@...ence.com>
> ---
>  .../devicetree/bindings/phy/phy-cadence-dp.txt     | 30 --------
>  .../bindings/phy/phy-cadence-torrent.yaml          | 82 ++++++++++++++++++++++
>  2 files changed, 82 insertions(+), 30 deletions(-)
>  delete mode 100644 Documentation/devicetree/bindings/phy/phy-cadence-dp.txt
>  create mode 100644 Documentation/devicetree/bindings/phy/phy-cadence-torrent.yaml

> diff --git a/Documentation/devicetree/bindings/phy/phy-cadence-torrent.yaml b/Documentation/devicetree/bindings/phy/phy-cadence-torrent.yaml
> new file mode 100644
> index 0000000..eb633d7
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/phy/phy-cadence-torrent.yaml
> @@ -0,0 +1,82 @@

Missing SPDX tag.

As Cadence is the only contributor to the old doc, please relicense to 
dual license:

(GPL-2.0-only OR BSD-2-Clause)

> +%YAML 1.2
> +---
> +$id: "http://devicetree.org/schemas/phy/phy-cadence-torrent.yaml#"
> +$schema: "http://devicetree.org/meta-schemas/core.yaml#"
> +
> +title: Cadence Torrent SD0801 PHY binding for DisplayPort
> +
> +description:
> +  This binding describes the Cadence SD0801 PHY (also known as Torrent PHY)
> +  hardware included with the Cadence MHDP DisplayPort controller.
> +
> +maintainers:
> +  - Swapnil Jakhade <sjakhade@...ence.com>
> +  - Yuti Amonkar <yamonkar@...ence.com>
> +
> +properties:
> +  compatible:
> +    const: cdns,torrent-phy
> +
> +  clocks:
> +    maxItems: 1
> +    description:
> +      PHY reference clock. Must contain an entry in clock-names.
> +
> +  clock-names:
> +    const: refclk
> +
> +  reg:
> +    minItems: 1
> +    maxItems: 2
> +    items:
> +      - description: Offset of the Torrent PHY configuration registers.
> +      - description: Offset of the DPTX PHY configuration registers.
> +
> +  reg-names:
> +    minItems: 1
> +    maxItems: 2
> +    items:
> +      - const: torrent_phy
> +      - const: dptx_phy
> +
> +  "#phy-cells":
> +    const: 0
> +
> +  num_lanes:

Given you don't care about compatibility, please make this 'num-lanes'.

> +    description:
> +      Number of DisplayPort lanes.
> +    allOf:
> +      - $ref: /schemas/types.yaml#/definitions/uint32
> +      - enum: [1, 2, 4]

If optional, then define a default.

> +
> +  max_bit_rate:

And this 'max-bit-rate-mbps'.

> +    description:
> +      Maximum DisplayPort link bit rate to use, in Mbps
> +    allOf:
> +      - $ref: /schemas/types.yaml#/definitions/uint32
> +      - enum: [2160, 2430, 2700, 3240, 4320, 5400, 8100]

default?

> +
> +required:
> +  - compatible
> +  - clocks
> +  - clock-names
> +  - reg
> +  - reg-names
> +  - "#phy-cells"
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    dp_phy: phy@...b500000 {
> +          compatible = "cdns,torrent-phy";
> +          reg = <0xf0 0xfb500000 0x0 0x00100000>,
> +                <0xf0 0xfb030a00 0x0 0x00000040>;
> +          reg-names = "torrent_phy", "dptx_phy";
> +          num_lanes = <4>;
> +          max_bit_rate = <8100>;
> +          #phy-cells = <0>;
> +          clocks = <&ref_clk>;
> +          clock-names = "refclk";
> +    };
> +...
> -- 
> 2.4.5
>