linux-kernel - RE: [net-next, v3, 02/10] ptp: support ptp physical/virtual clocks conversion

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Date:   Tue, 22 Jun 2021 10:18:53 +0000
From:   "Y.b. Lu" <yangbo.lu@....com>
To:     Richard Cochran <richardcochran@...il.com>
CC:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-kselftest@...r.kernel.org" <linux-kselftest@...r.kernel.org>,
        "mptcp@...ts.linux.dev" <mptcp@...ts.linux.dev>,
        "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Mat Martineau <mathew.j.martineau@...ux.intel.com>,
        Matthieu Baerts <matthieu.baerts@...sares.net>,
        Shuah Khan <shuah@...nel.org>,
        Michal Kubecek <mkubecek@...e.cz>,
        Florian Fainelli <f.fainelli@...il.com>,
        Andrew Lunn <andrew@...n.ch>, Rui Sousa <rui.sousa@....com>,
        Sebastien Laveze <sebastien.laveze@....com>
Subject: RE: [net-next, v3, 02/10] ptp: support ptp physical/virtual clocks
 conversion

Hi Richard,

> -----Original Message-----
> From: Richard Cochran <richardcochran@...il.com>
> Sent: 2021年6月18日 1:43
> To: Y.b. Lu <yangbo.lu@....com>
> Cc: netdev@...r.kernel.org; linux-kernel@...r.kernel.org;
> linux-kselftest@...r.kernel.org; mptcp@...ts.linux.dev; David S . Miller
> <davem@...emloft.net>; Jakub Kicinski <kuba@...nel.org>; Mat Martineau
> <mathew.j.martineau@...ux.intel.com>; Matthieu Baerts
> <matthieu.baerts@...sares.net>; Shuah Khan <shuah@...nel.org>; Michal
> Kubecek <mkubecek@...e.cz>; Florian Fainelli <f.fainelli@...il.com>;
> Andrew Lunn <andrew@...n.ch>; Rui Sousa <rui.sousa@....com>; Sebastien
> Laveze <sebastien.laveze@....com>
> Subject: Re: [net-next, v3, 02/10] ptp: support ptp physical/virtual clocks
> conversion
> 
> On Tue, Jun 15, 2021 at 05:45:09PM +0800, Yangbo Lu wrote:
> 
> > diff --git a/Documentation/ABI/testing/sysfs-ptp
> b/Documentation/ABI/testing/sysfs-ptp
> > index 2363ad810ddb..2ef11b775f47 100644
> > --- a/Documentation/ABI/testing/sysfs-ptp
> > +++ b/Documentation/ABI/testing/sysfs-ptp
> > @@ -61,6 +61,19 @@ Description:
> >  		This file contains the number of programmable pins
> >  		offered by the PTP hardware clock.
> >
> > +What:		/sys/class/ptp/ptpN/n_vclocks
> > +Date:		May 2021
> > +Contact:	Yangbo Lu <yangbo.lu@....com>
> > +Description:
> > +		This file contains the ptp virtual clocks number in use,
> > +		based on current ptp physical clock. In default, the
> > +		value is 0 meaning only ptp physical clock is in use.
> > +		Setting the value can create corresponding number of ptp
> > +		virtual clocks to use. But current ptp physical clock is
> > +		guaranteed to stay free running. Setting the value back
> > +		to 0 can delete ptp virtual clocks and back use ptp
> > +		physical clock again.
> 
> The native speaker in me suggests:
> 
> 		This file contains the number of virtual PTP clocks in
> 		use.  By default, the value is 0 meaning that only the
> 		physical clock is in use.  Setting the value creates
> 		the corresponding number of virtual clocks and causes
> 		the physical clock to become free running.  Setting the
> 		value back to 0 deletes the virtual clocks and
> 		switches the physical clock back to normal, adjustable
> 		operation.

Thank you! Will update. That's better than mine.

> 
> Thanks,
> Richard