linux-kernel - Re: [PATCH v4 2/3] dt-bindings: net: ethernet-phy: add enet-phy-clock-out-frequency

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Message-ID: <2463406.V3ZL2uFT5d@diego>
Date:   Wed, 17 Jun 2020 23:59:40 +0200
From:   Heiko Stübner <heiko@...ech.de>
To:     davem@...emloft.net
Cc:     kuba@...nel.org, robh+dt@...nel.org, andrew@...n.ch,
        f.fainelli@...il.com, hkallweit1@...il.com, linux@...linux.org.uk,
        netdev@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        christoph.muellner@...obroma-systems.com
Subject: Re: [PATCH v4 2/3] dt-bindings: net: ethernet-phy: add enet-phy-clock-out-frequency

Am Mittwoch, 17. Juni 2020, 23:33:25 CEST schrieb Heiko Stuebner:
> From: Heiko Stuebner <heiko.stuebner@...obroma-systems.com>
> 
> Some ethernet phys have a configurable clock output, so add a generic
> property to describe its target rate.
> 
> Suggested-by: Andrew Lunn <andrew@...n.ch>
> Signed-off-by: Heiko Stuebner <heiko.stuebner@...obroma-systems.com>

just now Rob wrote for v3:

----- 8< ------
The correct thing to do here is make the phy a clock provider and then 
the client side use 'assigned-clock-rate' to set the rate. That has the 
advantage that it also describes the connection of the clock signal. You 
might not need that for a simple case, but I could imagine needing that 
in a more complex case.

Rob
----- 8< ------



>  Documentation/devicetree/bindings/net/ethernet-phy.yaml | 5 +++++
>  1 file changed, 5 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/net/ethernet-phy.yaml b/Documentation/devicetree/bindings/net/ethernet-phy.yaml
> index 9b1f1147ca36..4dcf93f1c555 100644
> --- a/Documentation/devicetree/bindings/net/ethernet-phy.yaml
> +++ b/Documentation/devicetree/bindings/net/ethernet-phy.yaml
> @@ -84,6 +84,11 @@ properties:
>        the turn around line low at end of the control phase of the
>        MDIO transaction.
>  
> +  enet-phy-clock-out-frequency:
> +    $ref: /schemas/types.yaml#definitions/uint32
> +    description:
> +      Frequency in Hz to set an available clock output to.
> +
>    enet-phy-lane-swap:
>      $ref: /schemas/types.yaml#definitions/flag
>      description:
>