Re: [Linuxptp-users] PHYs supporting HW timestamping

[Wolfgang H. <wh...@xi...>]

I went through this some time ago with a Zynq SoC (MicroZed board).
Attached is a summary of the steps I took, perhaps some of it also 
applies to your board.
To generate the PPS signal from the DP83640 GPIO you would need to 
configure its internal registers. I found one can do that either in the 
Kernel driver dp83640.c (fixed setup) or with mii-tool (more 
interactively). My customized version of mii-tool is available at 
http://support.xia.com/default.asp?W772

Wolfgang

On 1/23/2019 4:47 AM, Arthur Dent wrote:
> Hi, thanks for the information on alternative 1 Gb PHYs (VSC8572 and LAN7430).
> A DP83640 evaluation board arrived today so I have decided to start out with that to see what kind of 1PPS accuracy I can get, and later decide if a 1 Gb interface is actually required for my application. 
> BR
> AD
>
>
> Sent: Tuesday, January 22, 2019 at 12:26 AM
> From: "David Mirabito"<da...@ar...>
> To: "Arthur Dent"<art...@cy...>
> Cc: lin...@li...
> Subject: Re: [Linuxptp-users] PHYs supporting HW timestamping
>
> It's not on the list (probably due to not being ptp-ready "out of the box" under Linux) but Microsemi's VSC8572 (nee Vitesse) and family could do the job (for 2-step PTP).
> https://www.microsemi.com/product-directory/gigabit-ethernet-phys/3905-vsc8572
>
>   
> For various reasons we ended up not using this feature so unfortunately I can't comment on the effort required to make it happen.
> Whilst there seems to be a Linux phylib driver for the part, last I checked timestamping wasn't implemented so there could be some fair bringup work.
>
> YMMV, but the part exists and hopefully is a useful datapoint in your search.
>   
> - David 
>
> On Mon, 21 Jan 2019 at 20:08, Arthur Dent<art...@cy...[mailto:art...@cy...]>  wrote:Hi
> On my Cyclone V SoC board I have ptp running with HW timestamping in MAC (stmmac), but I need even better accuracy, i.e. hardware timestamping in PHY. Is my only option to use TI’s DP83640 PHY (which only supports 100Mb) or am I reading the information on http://linuxptp.sourceforge.net[http://linuxptp.sourceforge.net] 0incorrectly?
> BR
> AD
>
>
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-- 
Wolfgang Hennig, Ph.D.
XIA LLC
31057 Genstar Rd.
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