linux-kernel - Re: [PATCH 4/4] net: dsa: mv88e6xxx: Support serdes ports on MV88E6123/6131

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Message-ID: <20201027215808.GF904240@lunn.ch>
Date:   Tue, 27 Oct 2020 22:58:08 +0100
From:   Andrew Lunn <andrew@...n.ch>
To:     Chris Packham <Chris.Packham@...iedtelesis.co.nz>
Cc:     "vivien.didelot@...il.com" <vivien.didelot@...il.com>,
        "f.fainelli@...il.com" <f.fainelli@...il.com>,
        "olteanv@...il.com" <olteanv@...il.com>,
        "davem@...emloft.net" <davem@...emloft.net>,
        "kuba@...nel.org" <kuba@...nel.org>,
        "linux@...linux.org.uk" <linux@...linux.org.uk>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 4/4] net: dsa: mv88e6xxx: Support serdes ports on
 MV88E6123/6131

On Tue, Oct 27, 2020 at 08:56:09PM +0000, Chris Packham wrote:
> 
> On 24/10/20 11:42 am, Andrew Lunn wrote:
> >> +int mv88e6123_serdes_get_regs_len(struct mv88e6xxx_chip *chip, int port)
> >> +{
> >> +	if (mv88e6xxx_serdes_get_lane(chip, port) == 0)
> >> +		return 0;
> >> +
> >> +	return 26 * sizeof(u16);
> >> +}
> > Hi Chris
> >
> > Where did 26 come from?

> In the 88E6123 Serdes Register Description the highest register address 
> was 26 so that's what I used.

> Technically there are 32 possible 
> addresses in that space so I could go up to 32. Equally registers 9-14, 
> 20, 22-23 are "reserved" so I could remove them from the total and have 
> mv88e6123_serdes_get_regs() skip over them. I'm guessing skipping some 
> (27-32) and not others is probably less than ideal.

Hi Chris

I would dump all 32 and let userspace figure out if they mean
anything. The current register dump for the 6390 SEDES is horrible,
and i missed a register, and it is not easy to put in its correct
place because of ABI reasons. If you can do KISS, all the better.

      Andrew