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

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Date:   Wed, 3 Jan 2018 11:00:48 +0000
From:   Graeme Gregory <graeme.gregory@...aro.org>
To:     Ard Biesheuvel <ard.biesheuvel@...aro.org>
Cc:     Marcin Wojtas <mw@...ihalf.com>,
        "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>,
        Andrew Lunn <andrew@...n.ch>,
        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@...e-electrons.com,
        Nadav Haklai <nadavh@...vell.com>,
        Neta Zur Hershkovits <neta@...vell.com>, jaz@...ihalf.com,
        Tomasz Nowicki <tn@...ihalf.com>
Subject: Re: [net-next: PATCH 0/8] Armada 7k/8k PP2 ACPI support

On Mon, Dec 18, 2017 at 10:40:31AM +0100, Ard Biesheuvel wrote:
> On 18 December 2017 at 10:17, Marcin Wojtas <mw@...ihalf.com> wrote:
> > Hi,
> >
> > This patchset introduces ACPI support in mvpp2 and mvmdio drivers.
> > First three patches introduce fwnode helpers for obtaining PHY
> > information from nodes and also MDIO fwnode API for registering
> > the bus with its PHY/devices.
> >
> > Following patches update code of the mvmdio and mvpp2 drivers
> > to support ACPI tables handling. The latter is done in 4 steps,
> > as can be seen in the commits. For the details, please
> > refer to the commit messages.
> >
> > Drivers operation was tested on top of the net-next branch
> > with both DT and ACPI. Although for compatibility reasons
> > with older platforms, the mvmdio driver keeps using
> > of_ MDIO registering, new fwnode_ one proved to fully work
> > with DT as well (tested on MacchiatoBin board).
> >
> > mvpp2/mvmdio driver can work with the ACPI representation, as exposed
> > on a public branch:
> > https://github.com/MarvellEmbeddedProcessors/edk2-open-platform/commits/marvell-armada-wip
> > It was compiled together with the most recent Tianocore EDK2 revision.
> > Please refer to the firmware build instruction on MacchiatoBin board:
> > http://wiki.macchiatobin.net/tiki-index.php?page=Build+from+source+-+UEFI+EDK+II
> >
> > Above support configures 1G to use its PHY normally. 10G can work now
> > only with the link interrupt mode. Somehow reading of the
> > string property in fwnode_mdiobus_child_is_phy works only with
> > DT and cannot cope with 10G PHY nodes as in:
> > https://pastebin.com/3JnYpU0A
> >
> > Above root cause will be further checked. In the meantime I will
> > appreciate any comments or remarks for the kernel patches.
> >
> 
> Hi Marcin,
> 
> I have added linux-acpi and Graeme to cc. I think it makes sense to
> discuss the way you describe the device topology before looking at the
> patches in more detail.
> 
> In particular, I would like to request feedback on the use of
> [redundant] 'reg' properties and the use of _DSD + compatible to
> describe PHYs. Usually, we try to avoid this, given that it is
> essentially a ACPI encapsulated DT dialect that is difficult to
> support in drivers unless they are based on DT to begin with. Also,
> non-standard _DSD properties require a vendor prefix, it is not
> freeform.
> 
> For reference, the ACPI description is here (starting at line 175)
> https://github.com/MarvellEmbeddedProcessors/edk2-open-platform/blob/72d5ac23b20dd74d479daa5e40ba443264b31261/Platforms/Marvell/Armada/AcpiTables/Armada80x0McBin/Dsdt.asl
> 
So the representation of PHY's with _DSD was kind of formalised here

http://www.uefi.org/sites/default/files/resources/nic-request-v2.pdf

This is already in use in the kernel, and that DSDT seems to be along the same
lines. So seems ok in that manner.

The "reg", 0 property seems a little odd, it would probably make more
sense to check for the lack of ranges passed in in ACPI manner _CRS.

Graeme


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