linux-kernel - Re: [PATCH net-next 2/3] net: dsa: mv88e6xxx: extend PTP gettime function to read system clock

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Message-ID: <20190819111639.GB6123@t480s.localdomain>
Date:   Mon, 19 Aug 2019 11:16:39 -0400
From:   Vivien Didelot <vivien.didelot@...il.com>
To:     Andrew Lunn <andrew@...n.ch>
Cc:     Hubert Feurstein <h.feurstein@...il.com>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Richard Cochran <richardcochran@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Vladimir Oltean <olteanv@...il.com>,
        "David S. Miller" <davem@...emloft.net>
Subject: Re: [PATCH net-next 2/3] net: dsa: mv88e6xxx: extend PTP gettime
 function to read system clock

On Mon, 19 Aug 2019 15:27:33 +0200, Andrew Lunn <andrew@...n.ch> wrote:
> > @@ -45,7 +45,8 @@ static int mv88e6xxx_smi_direct_write(struct mv88e6xxx_chip *chip,
> >  {
> >  	int ret;
> >  
> > -	ret = mdiobus_write_nested(chip->bus, dev, reg, data);
> > +	ret = mdiobus_write_sts_nested(chip->bus, dev, reg, data,
> > +				       chip->ptp_sts);
> >  	if (ret < 0)
> >  		return ret;
> >  
> 
> Please also make a similar change to mv88e6xxx_smi_indirect_write().
> The last write in that function should be timestamped.
> 
> Vivien, please could you think about these changes with respect to
> RMU. We probably want to skip the RMU in this case, so we get slow but
> uniform jitter, vs fast and unpredictable jitter from using the RMU.

The RMU will have its own mv88e6xxx_bus_ops.