Hi Andrew,

2018-01-03 13:47 GMT+01:00 Andrew Lunn [off-list ref]:

quoted

I already agreed with 'reg' being awkward in the later emails.
Wouldn't _ADR be more appropriate to specify PHY address on MDIO bus?

Also, how do you specify which MDIO bus the PHY is on. To fully
specify a PHY, you need both bits of information.

In DT, the phy-handle phandle can point to any PHY anywhere in the
system. This is particularly important when a Ethernet device has two
MDIO busses.

For now, my local MDIO bus description is pretty DT-like, i.e. master
bus with children PHYs:
        Device (MDIO)
        {
            Name (_HID, "MRVL0100")                             //
_HID: Hardware ID
            Name (_UID, 0x00)                                   //
_UID: Unique ID
            Name (_CRS, ResourceTemplate ()
            {
                Memory32Fixed (ReadWrite,
                    0xf212a200,                                 // Address Base
                    0x00000010,                                 //
Address Length
                    )
            })
            Device (GPHY)
            {
              Name (_ADR, 0x0)
            }
        }

        Device (XSMI)
        {
            Name (_HID, "MRVL0101")                             //
_HID: Hardware ID
            Name (_UID, 0x00)                                   //
_UID: Unique ID
            Name (_CRS, ResourceTemplate ()
            {
                Memory32Fixed (ReadWrite,
                    0xf212a600,                                 // Address Base
                    0x00000010,                                 //
Address Length
                    )
            })
            Device (PHY0)
            {
              Name (_ADR, 0x0)
              Name (_CID, "ethernet-phy-ieee802.3-c45")
            }
            Device (PHY8)
            {
              Name (_ADR, 0x8)
              Name (_CID, "ethernet-phy-ieee802.3-c45")
            }
        }

Which is referenced in the port's node:

Package () { "phy", Package (){\_SB.XSMI.PHY0}},

I'm studying an alternatives with graphs, as suggested by Tomasz
Nowicki, but to me above is pretty natural and not complicated.

Best regards,
Marcin