netdev - Re: [PATCH net-next 03/13] net: dsa: sja1105: the 0x1F0000 SGMII "base address" is actually MDIO_MMD

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Date:   Tue, 25 May 2021 04:40:50 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Vladimir Oltean <olteanv@...il.com>
Cc:     Jakub Kicinski <kuba@...nel.org>,
        "David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
        Florian Fainelli <f.fainelli@...il.com>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Vladimir Oltean <vladimir.oltean@....com>
Subject: Re: [PATCH net-next 03/13] net: dsa: sja1105: the 0x1F0000 SGMII
 "base address" is actually MDIO_MMD_VEND2

> Except that the 0x1f0000 is not a base address at all, it seems. It is
> 0x1f << 16 | 0x0000, and 0x1f is coding for the vendor-specific MMD2.
> So, it turns out, the Synopsys PCS implements all its registers inside
> the vendor-specific MMDs 1 and 2 (0x1e and 0x1f).

Any idea if this is specific to this device, or how the Synopsys PCS
does this in general? I was wondering if the code could be pulled out
and placed in driver/net/pcs, if it could be shared with other devices
using this IP?

      Andrew