linux-kernel - Re: [net-next: PATCH 0/8] Armada 7k/8k PP2 ACPI support

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Date:   Wed, 3 Jan 2018 14:13:09 +0100
From:   Marcin Wojtas <mw@...ihalf.com>
To:     Andrew Lunn <andrew@...n.ch>
Cc:     Graeme Gregory <graeme.gregory@...aro.org>,
        Ard Biesheuvel <ard.biesheuvel@...aro.org>,
        "linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "<netdev@...r.kernel.org>" <netdev@...r.kernel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Russell King - ARM Linux <linux@....linux.org.uk>,
        "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Antoine Ténart <antoine.tenart@...e-electrons.com>,
        Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>,
        Gregory CLEMENT <gregory.clement@...e-electrons.com>,
        Ezequiel Garcia <ezequiel.garcia@...e-electrons.com>,
        Nadav Haklai <nadavh@...vell.com>,
        Neta Zur Hershkovits <neta@...vell.com>,
        Grzegorz Jaszczyk <jaz@...ihalf.com>,
        Tomasz Nowicki <tn@...ihalf.com>
Subject: Re: [net-next: PATCH 0/8] Armada 7k/8k PP2 ACPI support

Hi Andrew,

2018-01-03 13:47 GMT+01:00 Andrew Lunn <andrew@...n.ch>:
>> 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