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

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Date:   Mon, 8 Jan 2018 15:14:53 +0000
From:   Graeme Gregory <graeme.gregory@...aro.org>
To:     Andrew Lunn <andrew@...n.ch>
Cc:     Marcin Wojtas <mw@...ihalf.com>,
        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

On Mon, Jan 08, 2018 at 03:53:12PM +0100, Andrew Lunn wrote:
> On Mon, Jan 08, 2018 at 02:45:48PM +0000, Graeme Gregory wrote:
> > On Thu, Jan 04, 2018 at 05:20:36PM +0100, Andrew Lunn wrote:
> > > > > I already agreed with 'reg' being awkward in the later emails.
> > > > > Wouldn't _ADR be more appropriate to specify PHY address on MDIO bus?
> > > > > 
> > > > Ah it is an actual address, then yes _ADR is probably more appropriate.
> > > 
> > > Newbie ACPI question. What is the definition of an address?
> > > 
> > > In this cause, we are talking about an address of a device on an MDIO
> > > bus. It takes a value between 0 and 31.
> > > 
> > > How are IC2 device addresses represented in ACPI? MDIO devices and I2C
> > > devices are pretty similar. So it would make sense to use the same as
> > > what I2C uses.
> > > 
> > Too big (and has table) to sensibly quote, but defined in ACPI spec
> > 
> > 6.1.1 _ADR (Address)
> > 
> > Ive never though been quite sure if that is just an example list of
> > address types or its supposed to be canonical (in which case some ECRs
> > are needed to the spec).
> 
> Hi Graeme
> 
> I took a quick look at version 6.2, and noticed i2c devices use
> _ADR(). So using it for MDIO seems O.K.
> 
> However, i2c, spi and uart devices all seem to be described using
> GenericSerialBus. Maybe the correct way to describe MDIO devices is to
> also use GenericSerialBus?
>
I am not familiar with MDIO, but if its similar or a specific
implementation of a serial bus that does sound sane!

Graeme


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