netdev - Re: [PATCH net-next 5/5] net: dsa: mv88e6xxx: Implement the 6390 external MDIO bus

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Date:   Tue, 24 Jan 2017 12:48:02 -0500
From:   Vivien Didelot <vivien.didelot@...oirfairelinux.com>
To:     Andrew Lunn <andrew@...n.ch>, David Miller <davem@...emloft.net>
Cc:     netdev <netdev@...r.kernel.org>,
        Florian Fainelli <f.fainelli@...il.com>,
        Andrew Lunn <andrew@...n.ch>
Subject: Re: [PATCH net-next 5/5] net: dsa: mv88e6xxx: Implement the 6390 external MDIO bus

Hi Andrew,

Sorry but the previous patches with a list of MDIO busses and refactored
PHY ops still seems too much complex to just toggle a bit.

We know which switch port has an external PHY attached to it, right?
So why not just something like this:

    struct mv88e6xxx_chip {
        ...
        u16 external_phys;
        ...
    }

    int mv88e6xxx_g2_smi_phy_read(struct mv88e6xxx_chip *chip, int phy,
                                  int reg, u16 *val)
    {
        u16 cmd = GLOBAL2_SMI_PHY_CMD_OP_22_READ_DATA | (addr << 5) | reg;
        int err;

        if (chip->external_phys & BIT(phy))
            cmd |= GLOBAL2_SMI_PHY_CMD_EXTERNAL;

        ...
    }


Thanks!

        Vivien