Subject: Re: [PATCH net-next v2 1/4] dt-bindings: net: Add tx and rx internal delays

From: Andrew Lunn <[email-masked]>
Date: Sat, 23 May 2020 17:13:40 +0200

On Fri, May 22, 2020 at 07:25:31AM -0500, Dan Murphy wrote:
> tx-internal-delays and rx-internal-delays are a common setting for RGMII
> capable devices.
> 
> These properties are used when the phy-mode or phy-controller is set to
> rgmii-id, rgmii-rxid or rgmii-txid.  These modes indicate to the
> controller that the PHY will add the internal delay for the connection.
> 
> Signed-off-by: Dan Murphy <[email-masked]>
> ---
> 
> v2 - updated to add -ps
> 
>  .../bindings/net/ethernet-controller.yaml          | 14 ++++++++++++++
>  1 file changed, 14 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/net/ethernet-controller.yaml b/Documentation/devicetree/bindings/net/ethernet-controller.yaml
> index ac471b60ed6a..70702a4ef5e8 100644
> --- a/Documentation/devicetree/bindings/net/ethernet-controller.yaml
> +++ b/Documentation/devicetree/bindings/net/ethernet-controller.yaml
> @@ -143,6 +143,20 @@ properties:
>        Specifies the PHY management type. If auto is set and fixed-link
>        is not specified, it uses MDIO for management.
>  
> +  rx-internal-delay-ps:
> +    $ref: /schemas/types.yaml#definitions/uint32
> +    description: |
> +      RGMII Receive PHY Clock Delay defined in pico seconds.  This is used for
> +      PHY's that have configurable RX internal delays.  This property is only
> +      used when the phy-mode or phy-connection-type is rgmii-id or rgmii-rxid.

Hi Dan

Please add a comment about rounding to the nearest supported value.

    Andrew