linux-kernel - Re: [PATCH net-next V2] dt-bindings: net: ethernet-controller: Add ptp-hardware-clock

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Date:   Tue, 25 Oct 2022 15:02:53 -0700
From:   Richard Cochran <richardcochran@...il.com>
To:     Rob Herring <robh@...nel.org>
Cc:     Sarath Babu Naidu Gaddam <sarath.babu.naidu.gaddam@....com>,
        davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
        pabeni@...hat.com, 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 V2] dt-bindings: net: ethernet-controller: Add
 ptp-hardware-clock

On Tue, Oct 25, 2022 at 02:46:08PM -0700, Richard Cochran wrote:
> On Mon, Oct 24, 2022 at 11:57:23AM -0500, Rob Herring wrote:
> > On Thu, Oct 20, 2022 at 11:41:10PM -0600, 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.
> > > 
> > > 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.
> > 
> > Seems like this does the same thing as 
> > Documentation/devicetree/bindings/ptp/timestamper.txt.
> 
> That is different. It goes from:
> 
>    MAC -> time stamp generator

actually:
     PHY -> time stamp generator

> The proposed binding goes from:
> 
>   MAC (with built in time stamp generator) -> PTP Hardware Clock (with get/settime etc)
> 
> 
> Thanks,
> Richard