netdev - Re: [RFC PATCH 3/9] net: dsa: hellcreek: Add PTP clock support

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Date:   Thu, 18 Jun 2020 08:46:14 -0700
From:   Jakub Kicinski <kuba@...nel.org>
To:     Kurt Kanzenbach <kurt@...utronix.de>
Cc:     Andrew Lunn <andrew@...n.ch>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        "David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
        Rob Herring <robh+dt@...nel.org>, devicetree@...r.kernel.org,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        Richard Cochran <richardcochran@...il.com>,
        Kamil Alkhouri <kamil.alkhouri@...offenburg.de>,
        ilias.apalodimas@...aro.org
Subject: Re: [RFC PATCH 3/9] net: dsa: hellcreek: Add PTP clock support

On Thu, 18 Jun 2020 08:40:23 +0200 Kurt Kanzenbach wrote:
> From: Kamil Alkhouri <kamil.alkhouri@...offenburg.de>
> 
> The switch has internal PTP hardware clocks. Add support for it. There are three
> clocks:
> 
>  * Synchronized
>  * Syntonized
>  * Free running
> 
> Currently the synchronized clock is exported to user space which is a good
> default for the beginning. The free running clock might be exported later
> e.g. for implementing 802.1AS-2011/2020 Time Aware Bridges (TAB). The switch
> also supports cross time stamping for that purpose.
> 
> The implementation adds support setting/getting the time as well as offset and
> frequency adjustments. However, the clock only holds a partial timeofday
> timestamp. This is why we track the seconds completely in software (see overflow
> work and last_ts).
> 
> Furthermore, add the PTP multicast addresses into the FDB to forward that
> packages only to the CPU port where they are processed by a PTP program.
> 
> Signed-off-by: Kamil Alkhouri <kamil.alkhouri@...offenburg.de>
> Signed-off-by: Kurt Kanzenbach <kurt@...utronix.de>

Please make sure each patch in the series builds cleanly with the W=1
C=1 flags. Here we have:

../drivers/net/dsa/hirschmann/hellcreek_ptp.c: In function â€˜__hellcreek_ptp_clock_readâ€™:
../drivers/net/dsa/hirschmann/hellcreek_ptp.c:30:28: warning: variable â€˜sechâ€™ set but not used [-Wunused-but-set-variable]
   30 |  u16 nsl, nsh, secl, secm, sech;
      |                            ^~~~
../drivers/net/dsa/hirschmann/hellcreek_ptp.c:30:22: warning: variable â€˜secmâ€™ set but not used [-Wunused-but-set-variable]
   30 |  u16 nsl, nsh, secl, secm, sech;
      |                      ^~~~
../drivers/net/dsa/hirschmann/hellcreek_ptp.c:30:16: warning: variable â€˜seclâ€™ set but not used [-Wunused-but-set-variable]
   30 |  u16 nsl, nsh, secl, secm, sech;
      |                ^~~~

Next patch adds a few more.