linux-kernel - RE: [RFC PATCH] dt-bindings: net: ethernet-controller: Add ptimer

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Date:   Fri, 30 Sep 2022 04:43:14 +0000
From:   "Gaddam, Sarath Babu Naidu" <sarath.babu.naidu.gaddam@....com>
To:     "Gaddam, Sarath Babu Naidu" <sarath.babu.naidu.gaddam@....com>,
        "davem@...emloft.net" <davem@...emloft.net>,
        "edumazet@...gle.com" <edumazet@...gle.com>,
        "kuba@...nel.org" <kuba@...nel.org>,
        "pabeni@...hat.com" <pabeni@...hat.com>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>
CC:     "krzysztof.kozlowski+dt@...aro.org" 
        <krzysztof.kozlowski+dt@...aro.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "richardcochran@...il.com" <richardcochran@...il.com>,
        "yangbo.lu@....com" <yangbo.lu@....com>,
        "Pandey, Radhey Shyam" <radhey.shyam.pandey@....com>,
        "Sarangi, Anirudha" <anirudha.sarangi@....com>,
        "Katakam, Harini" <harini.katakam@....com>
Subject: RE: [RFC PATCH] dt-bindings: net: ethernet-controller: Add
 ptimer_handle



> -----Original Message-----
> From: Sarath Babu Naidu Gaddam <sarath.babu.naidu.gaddam@....com>
> Sent: Thursday, September 29, 2022 5:43 PM
> To: davem@...emloft.net; edumazet@...gle.com; kuba@...nel.org;
> pabeni@...hat.com; robh+dt@...nel.org
> Cc: krzysztof.kozlowski+dt@...aro.org; netdev@...r.kernel.org;
> devicetree@...r.kernel.org; linux-kernel@...r.kernel.org;
> yangbo.lu@....com; Pandey, Radhey Shyam
> <radhey.shyam.pandey@....com>; Sarangi, Anirudha
> <anirudha.sarangi@....com>; Katakam, Harini
> <harini.katakam@....com>; Gaddam, Sarath Babu Naidu
> <sarath.babu.naidu.gaddam@....com>
> Subject: [RFC PATCH] dt-bindings: net: ethernet-controller: Add
> ptimer_handle
> 
> There is currently no standard property to pass PTP device index information
> to ethernet driver when they are independent.
> 
> ptimer_handle property will contain phandle to PTP timer node.
> 
> 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 timer node, instead of creating seperate property names in each
> ethernet driver DT node.
> 
> axiethernet driver uses this method when PTP support is integrated.
> 
> Example:
> 	fman0: fman@...0000 {
> 		ptimer-handle = <&ptp_timer0>;
> 	}
> 
> 	ptp_timer0: ptp-timer@...e000 {
> 		compatible = "fsl,fman-ptp-timer";
> 		reg = <0x0 0x1afe000 0x0 0x1000>;
> 	}
> 
> Signed-off-by: Sarath Babu Naidu Gaddam
> <sarath.babu.naidu.gaddam@....com>
> ---
> We want binding to be reviewed/accepted and then make changes in
> freescale binding documentation to use this generic binding.
> 
> 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
> 
> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/
> tree/Documentation/devicetree/bindings/net/fsl-fman.txt#n320
> 
> Freescale driver:
> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/
> tree/drivers/net/ethernet/freescale/dpaa/dpaa_ethtool.c#n467
> 
> Changes in V2:
> 1)Added links to reference code snippets.
> 2)Updated commit msg.
> 
> Comments, suggestions and thoughts to have a common name are very
> welcome...!
> ---
>  .../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 4b3c590fcebf..7e726d620c6a 100644
> --- a/Documentation/devicetree/bindings/net/ethernet-controller.yaml
> +++ b/Documentation/devicetree/bindings/net/ethernet-controller.yaml
> @@ -155,6 +155,11 @@ properties:
>        - auto
>        - in-band-status
> 
> +  ptimer_handle:
> +    $ref: /schemas/types.yaml#/definitions/phandle
> +    description:
> +      Specifies a reference to a node representing a IEEE1588 timer.
> +
>    fixed-link:
>      oneOf:
>        - $ref: /schemas/types.yaml#/definitions/uint32-array
> --
> 2.25.1

+Richard Cochran for PTP; apologies for missing earlier.

Thanks,
Sarath