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From: Andrew Lunn <andrew@lunn.ch>
To: Dan Callaghan <dan.callaghan@opengear.com>
Cc: Jeremy Linton <jeremy.linton@arm.com>,
	Calvin Johnson <calvin.johnson@oss.nxp.com>,
	Russell King <linux@armlinux.org.uk>, Jon <jon@solid-run.com>,
	Cristi Sovaiala <cristian.sovaiala@nxp.com>,
	Ioana Ciornei <ioana.ciornei@nxp.com>,
	Andy Shevchenko <andy.shevchenko@gmail.com>,
	Florian Fainelli <f.fainelli@gmail.com>,
	Madalin Bucur <madalin.bucur@oss.nxp.com>,
	netdev <netdev@vger.kernel.org>, "linux.cj" <linux.cj@gmail.com>,
	linux-acpi <linux-acpi@vger.kernel.org>
Subject: Re: [net-next PATCH v7 1/6] Documentation: ACPI: DSD: Document MDIO PHY
Date: Tue, 28 Jul 2020 22:45:48 +0200
Message-ID: <20200728204548.GC1748118@lunn.ch> (raw)
In-Reply-To: <1595922651-sup-5323@galangal.danc.bne.opengear.com>

On Tue, Jul 28, 2020 at 06:06:26PM +1000, Dan Callaghan wrote:
> Excerpts from Andrew Lunn's message of 2020-07-24 21:14:36 +02:00:
> > Now i could be wrong, but are Ethernet switches something you expect
> > to see on ACPI/SBSA platforms? Or is this a legitimate use of the
> > escape hatch?
> 
> As an extra data point: right now I am working on an x86 embedded 
> appliance (ACPI not Device Tree) with 3x integrated Marvell switches. 
> I have been watching this patch series with great interest, because 
> right now there is no way for me to configure a complex switch topology 
> in DSA without Device Tree.
> 
> For the device I am working on, we will have units shipping before these 
> questions about how to represent Ethernet switches in ACPI can be 
> resolved. So realistically, we will have to actually configure the 
> switches using software_node structures supplied by an out-of-tree 
> platform driver, or some hackery like that, rather than configuring them 
> through ACPI.

Hi Dan

I also have an x86 platform, but with a single switch. For that, i
have a platform driver, which instantiates a bit banging MDIO bus, and
sets up the switch using platform data. This works, but it is limited
to internal Copper only PHYs.

> An approach I have been toying with is to port all of DSA to use the 
> fwnode_handle abstraction instead of Device Tree nodes, but that is 
> obviously a large task, and frankly I was not sure whether such a patch 
> series would be welcomed.

I would actually suggest you look at using DT. We are struggling to
get ACPI maintainers involved with really simple things, like the ACPI
equivalent of a phandle from the MAC to the PHY. A full DSA binding
for Marvell switches is pretty complex, especially if you need SFP
support. I expect the ACPI maintainers will actively run away
screaming when you make your proposal.

DT can be used on x86, and i suspect it is a much easier path of least
resistance.

	Andrew

  parent reply index

Thread overview: 49+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-07-15  9:03 [net-next PATCH v7 0/6] ACPI support for dpaa2 MAC driver Calvin Johnson
2020-07-15  9:03 ` [net-next PATCH v7 1/6] Documentation: ACPI: DSD: Document MDIO PHY Calvin Johnson
2020-07-16  3:04   ` Florian Fainelli
2020-07-16  3:11     ` Andrew Lunn
2020-07-23 23:26   ` Jeremy Linton
2020-07-24 13:39     ` Andrew Lunn
2020-07-24 17:26       ` Jeremy Linton
2020-07-24 17:39         ` Florian Fainelli
2020-07-24 19:20           ` Andrew Lunn
2020-07-24 20:12             ` Andy Shevchenko
2020-07-24 20:13               ` Florian Fainelli
2020-07-24 20:20                 ` Andy Shevchenko
2020-07-25  7:36                   ` Calvin Johnson
2020-07-25 10:48                     ` Andy Shevchenko
2020-07-24 21:06               ` Russell King - ARM Linux admin
2020-07-27 17:03             ` Sudeep Holla
2020-07-24 19:14         ` Andrew Lunn
2020-07-27 17:21           ` Sudeep Holla
2020-07-28 20:34             ` Andrew Lunn
2020-07-28 20:59               ` Russell King - ARM Linux admin
2020-07-28 21:26                 ` Andy Shevchenko
2020-07-29 16:00               ` Rafael J. Wysocki
2020-07-31 15:08                 ` Andrew Lunn
2020-07-27 17:32           ` Jon Nettleton
     [not found]           ` <1595922651-sup-5323@galangal.danc.bne.opengear.com>
2020-07-28 20:45             ` Andrew Lunn [this message]
2020-07-28 20:56               ` Florian Fainelli
2020-07-28 21:28                 ` Andy Shevchenko
2020-07-28 21:40                   ` Florian Fainelli
2020-07-31 15:14                   ` Andrew Lunn
2020-09-25 13:22                     ` Grant Likely
2020-07-28 22:30             ` Jeremy Linton
2020-07-29  0:39               ` Florian Fainelli
2020-07-29  2:53                 ` Jeremy Linton
2020-07-29  3:16                   ` Florian Fainelli
2020-07-29  8:43                   ` Jon Nettleton
2020-07-29  9:39                     ` Calvin Johnson
2020-09-25 13:34   ` Grant Likely
2020-09-26  4:30     ` Calvin Johnson
2020-07-15  9:03 ` [net-next PATCH v7 2/6] net: phy: introduce device_mdiobus_register() Calvin Johnson
2020-07-16  3:05   ` Florian Fainelli
2020-07-15  9:03 ` [net-next PATCH v7 3/6] net/fsl: use device_mdiobus_register() Calvin Johnson
2020-07-16  3:05   ` Florian Fainelli
2020-07-15  9:03 ` [net-next PATCH v7 4/6] net: phy: introduce phy_find_by_mdio_handle() Calvin Johnson
2020-07-16  3:06   ` Florian Fainelli
2020-07-15  9:03 ` [net-next PATCH v7 5/6] phylink: introduce phylink_fwnode_phy_connect() Calvin Johnson
2020-07-15  9:04 ` [net-next PATCH v7 6/6] net: dpaa2-mac: Add ACPI support for DPAA2 MAC driver Calvin Johnson
2020-09-25 13:39 ` [net-next PATCH v7 0/6] ACPI support for dpaa2 " Grant Likely
2020-09-26  4:34   ` Calvin Johnson
2020-07-25 14:23 Calvin Johnson
2020-07-25 14:23 ` [net-next PATCH v7 1/6] Documentation: ACPI: DSD: Document MDIO PHY Calvin Johnson

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