netdev - RE: [PATCH] ptp_qoriq: add initialization message

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Date:   Wed, 12 Feb 2020 10:59:45 +0000
From:   "Y.b. Lu" <yangbo.lu@....com>
To:     Vladimir Oltean <olteanv@...il.com>
CC:     David Miller <davem@...emloft.net>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "richardcochran@...il.com" <richardcochran@...il.com>
Subject: RE: [PATCH] ptp_qoriq: add initialization message

> -----Original Message-----
> From: Vladimir Oltean <olteanv@...il.com>
> Sent: Wednesday, February 12, 2020 6:46 PM
> To: Y.b. Lu <yangbo.lu@....com>
> Cc: David Miller <davem@...emloft.net>; netdev@...r.kernel.org;
> richardcochran@...il.com
> Subject: Re: [PATCH] ptp_qoriq: add initialization message
> 
> Hi Yangbo,
> 
> On Wed, 12 Feb 2020 at 12:39, Y.b. Lu <yangbo.lu@....com> wrote:
> >
> > > -----Original Message-----
> > > From: Vladimir Oltean <olteanv@...il.com>
> > > Sent: Wednesday, February 12, 2020 6:34 PM
> > > To: Y.b. Lu <yangbo.lu@....com>
> > > Cc: David Miller <davem@...emloft.net>; netdev@...r.kernel.org;
> > > richardcochran@...il.com
> > > Subject: Re: [PATCH] ptp_qoriq: add initialization message
> > >
> > > Hi Yangbo,
> > >
> > > On Wed, 12 Feb 2020 at 12:25, Y.b. Lu <yangbo.lu@....com> wrote:
> > > >
> > > > > -----Original Message-----
> > > > > From: netdev-owner@...r.kernel.org <netdev-owner@...r.kernel.org>
> On
> > > > > Behalf Of David Miller
> > > > > Sent: Wednesday, February 12, 2020 9:07 AM
> > > > > To: Y.b. Lu <yangbo.lu@....com>
> > > > > Cc: netdev@...r.kernel.org; richardcochran@...il.com
> > > > > Subject: Re: [PATCH] ptp_qoriq: add initialization message
> > > > >
> > > > > From: Yangbo Lu <yangbo.lu@....com>
> > > > > Date: Tue, 11 Feb 2020 12:50:53 +0800
> > > > >
> > > > > > It is necessary to print the initialization result.
> > > > >
> > > > > No, it is not.
> > > >
> > > > Sorry, I should have added my reasons into commit message.
> > > > I sent out v2. Do you think if it makes sense?
> > > >
> > > > " Current ptp_qoriq driver prints only warning or error messages.
> > > > It may be loaded successfully without any messages.
> > > > Although this is fine, it would be convenient to have an oneline
> > > > initialization log showing success and PTP clock index.
> > > > The goods are,
> > > > - The ptp_qoriq driver users may know whether this driver is loaded
> > > >   successfully, or not, or not loaded from the booting log.
> > > > - The ptp_qoriq driver users don't have to install an ethtool to
> > > >   check the PTP clock index for using. Or don't have to check which
> > > >   /sys/class/ptp/ptpX is PTP QorIQ clock."
> > > >
> > > > Thanks.
> > >
> > > How about this message which is already there?
> > > [    2.603163] pps pps0: new PPS source ptp0
> >
> > This message is from pps subsystem. We don't know what PTP clock is
> registered as ptp0.
> > And if the PTP clock doesn't support pps capability, even this log won't be
> showed.
> >
> > Thanks.
> >
> > >
> > > Thanks,
> > > -Vladimir
> 
> Yes but this is ptp_qoriq, which specifically _does_ support PPS, so
> the message will be printed. Am I missing something?

The ptp_qoriq driver is a common driver. It could be reused for any Ethernet controller's with such PTP timer, such as enetc_ptp.c, dpaa2_ptp.c.
It has possibility that they had different capabilities. And there may be such case that a new driver reused ptp_qoriq may want to support part features not including pps first.

So this message you mentioned couldn’t bring the two goods I described.
Thanks.

> 
> Regards,
> -Vladimir