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

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Message-ID: <CAPv3WKcYSQeUnNr20T_M3B-upg0Z=CnVS9fvd=v18Tbh4T7FWg@mail.gmail.com>
Date:   Wed, 20 Dec 2017 00:13:01 +0100
From:   Marcin Wojtas <mw@...ihalf.com>
To:     Andrew Lunn <andrew@...n.ch>
Cc:     David Miller <davem@...emloft.net>, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        netdev <netdev@...r.kernel.org>,
        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 Clément 
        <gregory.clement@...e-electrons.com>,
        Ezequiel Garcia <ezequiel.garcia@...e-electrons.com>,
        nadavh@...vell.com, Neta Zur Hershkovits <neta@...vell.com>,
        Ard Biesheuvel <ard.biesheuvel@...aro.org>,
        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,

2017-12-19 21:46 GMT+01:00 Andrew Lunn <andrew@...n.ch>:
>> Of course! v2 will not have such problem, I've been waiting however
>> for the feedback about the ACPI representation. Anyway, I'm strongly
>> leaning towards using _ADR/_CID objects in PHY's nodes for ACPI, so
>> maybe I'll just issue the v2 in order to push the discussion a bit
>> forward.
>
> Hi Marcin
>
> I know ~0 about ACPI. But what seems to be missing for me is
> documentation. You are defining a ABI here, which all future MDIO
> busses, PHYs, and to some extent Ethernet switches need to follow. So
> i would expect this to be documented somewhere.

As the code derives straight from of_mdio.c, there is absolutely no
deviation from Documentation/devicetree/bindings/net/mdio.txt.

>
> How does documentation work in the ACPI world?
>

ACPI has its own specification, the newest one is 6.2
http://www.uefi.org/sites/default/files/resources/ACPI_6_2.pdf

It is pretty likely, that if we establish a generic solution for the
MDIO bus, a short section about it may probably require adding to
above - for now I see none.

Best regards,
Marcin