linux-kernel - Re: [PATCH v2 01/14] dt-bindings: phy: Convert Cadence MHDP PHY bindings to YAML.

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Message-ID: <a96aef7e-7c6d-5152-2e14-bb803d206cba@ti.com>
Date:   Tue, 31 Dec 2019 14:24:07 +0200
From:   Jyri Sarha <jsarha@...com>
To:     Yuti Amonkar <yamonkar@...ence.com>,
        <linux-kernel@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <kishon@...com>, <robh+dt@...nel.org>, <mark.rutland@....com>,
        <maxime@...no.tech>
CC:     <tomi.valkeinen@...com>, <praneeth@...com>, <mparab@...ence.com>,
        <sjakhade@...ence.com>
Subject: Re: [PATCH v2 01/14] dt-bindings: phy: Convert Cadence MHDP PHY
 bindings to YAML.

On 23/12/2019 17:15, Yuti Amonkar wrote:
> - Convert the MHDP PHY devicetree bindings to yaml schemas.
> - Rename DP PHY to have generic Torrent PHY nomrnclature.
> - 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          | 64 ++++++++++++++++++++++
>  2 files changed, 64 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-dp.txt b/Documentation/devicetree/bindings/phy/phy-cadence-dp.txt
> deleted file mode 100644
> index 7f49fd54e..0000000
> --- a/Documentation/devicetree/bindings/phy/phy-cadence-dp.txt
> +++ /dev/null
> @@ -1,30 +0,0 @@
> -Cadence MHDP DisplayPort SD0801 PHY binding
> -===========================================
> -
> -This binding describes the Cadence SD0801 PHY hardware included with
> -the Cadence MHDP DisplayPort controller.
> -
> --------------------------------------------------------------------------------
> -Required properties (controller (parent) node):
> -- compatible	: Should be "cdns,dp-phy"
> -- reg		: Defines the following sets of registers in the parent
> -		  mhdp device:
> -			- Offset of the DPTX PHY configuration registers
> -			- Offset of the SD0801 PHY configuration registers
> -- #phy-cells	: from the generic PHY bindings, must be 0.
> -
> -Optional properties:
> -- num_lanes	: Number of DisplayPort lanes to use (1, 2 or 4)
> -- max_bit_rate	: Maximum DisplayPort link bit rate to use, in Mbps (2160,
> -		  2430, 2700, 3240, 4320, 5400 or 8100)
> --------------------------------------------------------------------------------
> -
> -Example:
> -	dp_phy: phy@...b030a00 {
> -		compatible = "cdns,dp-phy";
> -		reg = <0xf0 0xfb030a00 0x0 0x00000040>,
> -		      <0xf0 0xfb500000 0x0 0x00100000>;
> -		num_lanes = <4>;
> -		max_bit_rate = <8100>;
> -		#phy-cells = <0>;
> -	};
> 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..3587312
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/phy/phy-cadence-torrent.yaml
> @@ -0,0 +1,64 @@
> +%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 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
> +
> +  reg:
> +    items:
> +      - description: Offset of the DPTX PHY configuration registers.

Isn't it possible to use torrent-phy in a configuration that does not
have dptx? Shouldn't the "dptx_phy" reg entry be optional?

BTW, I have no idea how to indicate in a yaml binding that some named
reg-entry is mandatory, and another is optional... anybody? Or is it
just something to explain in the description?

> +      - description: Offset of the SD0801 PHY configuration registers.
> +
> +  reg-names:
> +    items:
> +      - const: dptx_phy
> +      - const: sd0801_phy
> +
> +  "#phy-cells":
> +    const: 0
> +
> +  num_lanes:
> +    description:
> +      Number of DisplayPort lanes.
> +    allOf:
> +      - $ref: /schemas/types.yaml#/definitions/uint32
> +      - enum: [1, 2, 4]
> +
> +  max_bit_rate:
> +    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]
> +
> +required:
> +  - compatible
> +  - reg

Shouldn't the reg-names be mandatory too?

> +  - "#phy-cells"
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    dp_phy: phy@...b030a00 {
> +          compatible = "cdns,torrent-phy";
> +          reg = <0xf0 0xfb030a00 0x0 0x00000040>,
> +                <0xf0 0xfb500000 0x0 0x00100000>;

There are no reg-names here?

> +          num_lanes = <4>;
> +          max_bit_rate = <8100>;
> +          #phy-cells = <0>;
> +    };
> +...
> 


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