netdev - Re: [PATCH 4/4] dt-bindings: net: adin: document 1588 TX/RX SOP bindings

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Date:   Tue, 21 Jan 2020 20:05:23 -0600
From:   Rob Herring <robh@...nel.org>
To:     Alexandru Ardelean <alexandru.ardelean@...log.com>
Cc:     netdev@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, davem@...emloft.net, andrew@...n.ch,
        f.fainelli@...il.com, hkallweit1@...il.com
Subject: Re: [PATCH 4/4] dt-bindings: net: adin: document 1588 TX/RX SOP
 bindings

On Thu, Jan 16, 2020 at 11:14:54AM +0200, Alexandru Ardelean wrote:
> This change documents the device-tree bindings for the TX/RX indication of
> IEEE 1588 packets.
> 
> Signed-off-by: Alexandru Ardelean <alexandru.ardelean@...log.com>
> ---
>  .../devicetree/bindings/net/adi,adin.yaml     | 60 +++++++++++++++++++
>  1 file changed, 60 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/net/adi,adin.yaml b/Documentation/devicetree/bindings/net/adi,adin.yaml
> index d95cc691a65f..eb56f35309e0 100644
> --- a/Documentation/devicetree/bindings/net/adi,adin.yaml
> +++ b/Documentation/devicetree/bindings/net/adi,adin.yaml
> @@ -36,6 +36,60 @@ properties:
>      enum: [ 4, 8, 12, 16, 20, 24 ]
>      default: 8
>  
> +  adi,1588-rx-sop-delays-cycles:
> +    allOf:
> +      - $ref: /schemas/types.yaml#definitions/uint8-array
> +      - items:
> +          - minItems: 3
> +            maxItems: 3

You can split up the description into constraints something like this 
(and minItems/maxItems becomes implied):

items:
  - description: delay for 10BASE-T
  - description: delay for 100BASE-T
  - description: delay for 1000BASE-T

> +    description: |
> +      Enables Start Packet detection (SOP) for received IEEE 1588 time stamp
> +      controls, and configures the number of cycles (of the MII RX_CLK clock)
> +      to delay the indication of RX SOP frames for 10/100/1000 BASE-T links.
> +      The first element (in the array) configures the delay for 10BASE-T,
> +      the second for 100BASE-T, and the third for 1000BASE-T.
> +
> +  adi,1588-rx-sop-pin-name:
> +    description: |
> +      This option must be used in together with 'adi,1588-rx-sop-delays-cycles'
> +      to specify which physical pin should be used to signal the MAC that
> +      the PHY is currently processing an IEEE 1588 timestamp control packet.
> +      The driver will report an error if the value of this property is the
> +      same as 'adi,1588-tx-sop-pin-name'
> +    enum:
> +      - gp_clk
> +      - link_st
> +      - int_n
> +      - led_0
> +
> +  adi,1588-tx-sop-delays-ns:
> +    allOf:
> +      - $ref: /schemas/types.yaml#definitions/uint8-array
> +      - items:
> +          - minItems: 3
> +            maxItems: 3

This should be:

      - minItems: 3
        maxItems: 3
        items:
          multipleOf: 8

> +    description: |
> +      Enables Start Packet detection (SOP) for IEEE 1588 time stamp controls,
> +      and configures the number of nano-seconds to delay the indication of
> +      TX frames for 10/100/1000 BASE-T links.
> +      The first element (in the array) configures the delay for 10BASE-T,
> +      the second for 100BASE-T, and the third for 1000BASE-T.
> +      The delays must be multiples of 8 ns (i.e. 8, 16, 24, etc).
> +
> +  adi,1588-tx-sop-pin-name:
> +    description: |
> +      This option must be used in together with 'adi,1588-tx-sop-delays-ns'
> +      to specify which physical pin should be used to signal the MAC that
> +      the PHY is currently processing an IEEE 1588 timestamp control packet
> +      on the TX path.
> +      The driver will report an error if the value of this property is the
> +      same as 'adi,1588-rx-sop-pin-name'
> +    enum:
> +      - gp_clk
> +      - link_st
> +      - int_n
> +      - led_0
> +
>  examples:
>    - |
>      ethernet {
> @@ -62,5 +116,11 @@ examples:
>              reg = <1>;
>  
>              adi,fifo-depth-bits = <16>;
> +
> +            adi,1588-rx-sop-delays-cycles = [ 00 00 00 ];
> +            adi,1588-rx-sop-pin-name = "int_n";
> +
> +            adi,1588-tx-sop-delays-ns = [ 00 08 10 ];
> +            adi,1588-tx-sop-pin-name = "led_0";
>          };
>      };
> -- 
> 2.20.1
>