netdev - Re: [PATCH net-next V3] dt-bindings: net: ethernet-controller: Add ptp-hardware-clock

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Message-ID: <c2773010-2367-ba20-e0fa-2e060cb95128@linaro.org>
Date:   Tue, 14 Mar 2023 16:46:21 +0100
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Sarath Babu Naidu Gaddam <sarath.babu.naidu.gaddam@....com>,
        davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
        pabeni@...hat.com, robh+dt@...nel.org, richardcochran@...il.com
Cc:     krzysztof.kozlowski+dt@...aro.org, netdev@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        yangbo.lu@....com, radhey.shyam.pandey@....com,
        anirudha.sarangi@....com, harini.katakam@....com, git@....com
Subject: Re: [PATCH net-next V3] dt-bindings: net: ethernet-controller: Add
 ptp-hardware-clock

On 08/03/2023 06:44, Sarath Babu Naidu Gaddam wrote:
> There is currently no standard property to pass PTP device index
> information to ethernet driver when they are independent.
> 
> ptp-hardware-clock property will contain phandle to PTP clock node.
> 
> Its a generic (optional) property name to link to PTP phandle to
> Ethernet node. Any future or current ethernet drivers that need
> a reference to the PHC used on their system can simply use this
> generic property name instead of using custom property
> implementation in their device tree nodes."
> 
> Signed-off-by: Sarath Babu Naidu Gaddam <sarath.babu.naidu.gaddam@....com>
> Acked-by: Richard Cochran <richardcochran@...il.com>
> ---
> 
> Freescale driver currently has this implementation but it will be
> good to agree on a generic (optional) property name to link to PTP
> phandle to Ethernet node. In future or any current ethernet driver
> wants to use this method of reading the PHC index,they can simply use
> this generic name and point their own PTP clock node, instead of
> creating separate property names in each ethernet driver DT node.

Again, I would like to see an user of this. I asked about this last time
and nothing was provided.

So basically you send the same thing hoping this time will be accepted...

> 
> axiethernet driver uses this method when PTP support is integrated.
> 
> Example:
>     fman0: fman@...0000 {
>         ptp-hardware-clock = <&ptp_timer0>;
>     }
> 
>     ptp_timer0: ptp-timer@...e000 {
>         compatible = "fsl,fman-ptp-timer";
>         reg = <0x0 0x1afe000 0x0 0x1000>;
>     }
> 
> DT information:
> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/arch/arm64/boot/dts/freescale/qoriq-fman3-0.dtsi#n23
> 
> Freescale driver:
> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/drivers/net/ethernet/freescale/dpaa/dpaa_ethtool.c#n407
> 
> Changes in V3:
> 1) Updated commit description.
> 2) Add Acked-by: Richard Cochran.
> 
> Changes in V2:
> 1) Changed the ptimer-handle to ptp-hardware-clock based on
>    Richard Cochran's comment.
> 2) Updated commit description.
> ---
>  .../devicetree/bindings/net/ethernet-controller.yaml         | 5 +++++
>  1 file changed, 5 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/net/ethernet-controller.yaml b/Documentation/devicetree/bindings/net/ethernet-controller.yaml
> index 00be387984ac..a97ab25b07a5 100644
> --- a/Documentation/devicetree/bindings/net/ethernet-controller.yaml
> +++ b/Documentation/devicetree/bindings/net/ethernet-controller.yaml
> @@ -161,6 +161,11 @@ properties:
>        - auto
>        - in-band-status
>  
> +  ptp-hardware-clock:
> +    $ref: /schemas/types.yaml#/definitions/phandle
> +    description:
> +      Specifies a reference to a node representing a IEEE1588 timer.


https://lore.kernel.org/all/cfbde0da-9939-e976-52c1-88577de7d4cb@linaro.org/

This is a friendly reminder during the review process.

It seems my previous comments were not fully addressed. Maybe my
feedback got lost between the quotes, maybe you just forgot to apply it.
Please go back to the previous discussion and either implement all
requested changes or keep discussing them.

Thank you.

Best regards,
Krzysztof