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From: Andrew Lunn <andrew@lunn.ch>
To: Will Deacon <will@kernel.org>
Cc: Robin Murphy <robin.murphy@arm.com>,
	Jon Nettleton <jon@solid-run.com>,
	Ard Biesheuvel <ard.biesheuvel@linaro.org>,
	Marc Zyngier <maz@kernel.org>,
	Makarand Pawagi <makarand.pawagi@nxp.com>,
	Calvin Johnson <calvin.johnson@nxp.com>,
	stuyoder@gmail.com, nleeder@codeaurora.org,
	Ioana Ciornei <ioana.ciornei@nxp.com>,
	Cristi Sovaiala <cristian.sovaiala@nxp.com>,
	Hanjun Guo <guohanjun@huawei.com>,
	Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>,
	Pankaj Bansal <pankaj.bansal@nxp.com>,
	Russell King <linux@armlinux.org.uk>,
	ACPI Devel Maling List <linux-acpi@vger.kernel.org>,
	Len Brown <lenb@kernel.org>, Jason Cooper <jason@lakedaemon.net>,
	Andy Wang <Andy.Wang@arm.com>, Varun Sethi <V.Sethi@nxp.com>,
	Thomas Gleixner <tglx@linutronix.de>,
	linux-arm-kernel <linux-arm-kernel@lists.infradead.org>,
	Laurentiu Tudor <laurentiu.tudor@nxp.com>,
	Paul Yang <Paul.Yang@arm.com>,
	"<netdev@vger.kernel.org>" <netdev@vger.kernel.org>,
	"Rafael J. Wysocki" <rjw@rjwysocki.net>,
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
	Shameerali Kolothum Thodi  <shameerali.kolothum.thodi@huawei.com>,
	Sudeep Holla <sudeep.holla@arm.com>
Subject: Re: [EXT] Re: [PATCH] bus: fsl-mc: Add ACPI support for fsl-mc
Date: Fri, 31 Jan 2020 16:09:29 +0100	[thread overview]
Message-ID: <20200131150929.GB13902@lunn.ch> (raw)
In-Reply-To: <20200131144737.GA4948@willie-the-truck>

> Devicetree to the rescue!

Yes, exactly. We have good, standardised descriptions for most of this
in device tree. And phylink can handle SFP and SFP+. Nobody has worked
on QSFP yet, since phylink has mostly been pushed by the embedded
world and 40G is not yet popular in the embedded world.

> Entertaining the use of ACPI without any firmware abstraction for this
> hardware really feels like a square peg / round hole situation, so I'm
> assuming somebody's telling you that you need it "FOAR ENTAPRYZE". Who
> is it and can you tell them to bog off?

The issues here is that SFPs are appearing in more and more server
systems, replacing plain old copper Ethernet. If the boxes use off the
shelf Mellanox or Intel PCIe cards, it is not an issue. But silicon
vendors are integrating this into the SoC in the ARM way of doing
things, memory mapped, spread over a number of controllers, not a
single PCIe device.

Maybe we need hybrid systems. Plain, old, simple, boring things like
CPUs, serial ports, SATA, PCIe busses are described in ACPI. Complex
interesting things are in DT. The hard thing is the interface between
the two. DT having a phandle to an ACPI object, e.g a GPIO, interrupt
or an i2c bus.

   Andrew

WARNING: multiple messages have this Message-ID (diff)
From: Andrew Lunn <andrew@lunn.ch>
To: Will Deacon <will@kernel.org>
Cc: Calvin Johnson <calvin.johnson@nxp.com>,
	stuyoder@gmail.com, nleeder@codeaurora.org,
	Ioana Ciornei <ioana.ciornei@nxp.com>,
	Cristi Sovaiala <cristian.sovaiala@nxp.com>,
	Hanjun Guo <guohanjun@huawei.com>,
	Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>,
	Marc Zyngier <maz@kernel.org>,
	Pankaj Bansal <pankaj.bansal@nxp.com>,
	Jon Nettleton <jon@solid-run.com>,
	Russell King <linux@armlinux.org.uk>,
	ACPI Devel Maling List <linux-acpi@vger.kernel.org>,
	Len Brown <lenb@kernel.org>, Jason Cooper <jason@lakedaemon.net>,
	Andy Wang <Andy.Wang@arm.com>,
	Makarand Pawagi <makarand.pawagi@nxp.com>,
	Varun Sethi <V.Sethi@nxp.com>,
	Thomas Gleixner <tglx@linutronix.de>,
	linux-arm-kernel <linux-arm-kernel@lists.infradead.org>,
	Laurentiu Tudor <laurentiu.tudor@nxp.com>,
	Paul Yang <Paul.Yang@arm.com>,
	Ard Biesheuvel <ard.biesheuvel@linaro.org>,
	"<netdev@vger.kernel.org>" <netdev@vger.kernel.org>,
	"Rafael J. Wysocki" <rjw@rjwysocki.net>,
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
	Shameerali Kolothum Thodi <shameerali.kolothum.thodi@huawei.com>,
	Sudeep Holla <sudeep.holla@arm.com>,
	Robin Murphy <robin.murphy@arm.com>
Subject: Re: [EXT] Re: [PATCH] bus: fsl-mc: Add ACPI support for fsl-mc
Date: Fri, 31 Jan 2020 16:09:29 +0100	[thread overview]
Message-ID: <20200131150929.GB13902@lunn.ch> (raw)
In-Reply-To: <20200131144737.GA4948@willie-the-truck>

> Devicetree to the rescue!

Yes, exactly. We have good, standardised descriptions for most of this
in device tree. And phylink can handle SFP and SFP+. Nobody has worked
on QSFP yet, since phylink has mostly been pushed by the embedded
world and 40G is not yet popular in the embedded world.

> Entertaining the use of ACPI without any firmware abstraction for this
> hardware really feels like a square peg / round hole situation, so I'm
> assuming somebody's telling you that you need it "FOAR ENTAPRYZE". Who
> is it and can you tell them to bog off?

The issues here is that SFPs are appearing in more and more server
systems, replacing plain old copper Ethernet. If the boxes use off the
shelf Mellanox or Intel PCIe cards, it is not an issue. But silicon
vendors are integrating this into the SoC in the ARM way of doing
things, memory mapped, spread over a number of controllers, not a
single PCIe device.

Maybe we need hybrid systems. Plain, old, simple, boring things like
CPUs, serial ports, SATA, PCIe busses are described in ACPI. Complex
interesting things are in DT. The hard thing is the interface between
the two. DT having a phandle to an ACPI object, e.g a GPIO, interrupt
or an i2c bus.

   Andrew

_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

  reply	other threads:[~2020-01-31 15:09 UTC|newest]

Thread overview: 68+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-01-28  8:08 [PATCH] bus: fsl-mc: Add ACPI support for fsl-mc Makarand Pawagi
2020-01-28  8:08 ` Makarand Pawagi
2020-01-28 10:58 ` Marc Zyngier
2020-01-28 10:58   ` Marc Zyngier
2020-01-28 11:09 ` Lorenzo Pieralisi
2020-01-28 11:09   ` Lorenzo Pieralisi
2020-01-31 10:35   ` [EXT] " Makarand Pawagi
2020-01-31 10:35     ` Makarand Pawagi
2020-01-31 11:06     ` Lorenzo Pieralisi
2020-01-31 11:06       ` Lorenzo Pieralisi
2020-01-31 11:06     ` Marc Zyngier
2020-01-31 11:06       ` Marc Zyngier
2020-01-31 12:01       ` Ard Biesheuvel
2020-01-31 12:01         ` Ard Biesheuvel
2020-01-31 12:28         ` Jon Nettleton
2020-01-31 12:28           ` Jon Nettleton
2020-01-31 12:48           ` Robin Murphy
2020-01-31 12:48             ` Robin Murphy
2020-01-31 13:11             ` Jon Nettleton
2020-01-31 13:11               ` Jon Nettleton
2020-01-31 13:29               ` Ard Biesheuvel
2020-01-31 13:29                 ` Ard Biesheuvel
2020-01-31 13:39               ` Robin Murphy
2020-01-31 13:39                 ` Robin Murphy
2020-01-31 14:29                 ` Andrew Lunn
2020-01-31 14:29                   ` Andrew Lunn
2020-01-31 14:47                   ` Will Deacon
2020-01-31 14:47                     ` Will Deacon
2020-01-31 15:09                     ` Andrew Lunn [this message]
2020-01-31 15:09                       ` Andrew Lunn
2020-01-31 15:14                       ` Jon Nettleton
2020-01-31 15:14                         ` Jon Nettleton
2020-01-31 15:41                         ` Andrew Lunn
2020-01-31 15:41                           ` Andrew Lunn
2020-01-31 15:39                       ` Russell King - ARM Linux admin
2020-01-31 15:39                         ` Russell King - ARM Linux admin
2020-01-31 15:15                   ` Russell King - ARM Linux admin
2020-01-31 15:15                     ` Russell King - ARM Linux admin
2020-01-31 15:40                     ` Jakub Kicinski
2020-01-31 15:40                       ` Jakub Kicinski
2020-02-01 11:49                       ` Russell King - ARM Linux admin
2020-02-01 11:49                         ` Russell King - ARM Linux admin
2020-02-01 17:36                         ` Jakub Kicinski
2020-02-01 17:36                           ` Jakub Kicinski
2020-02-14 15:05         ` Pankaj Bansal
2020-02-14 15:05           ` Pankaj Bansal
2020-02-14 15:54           ` Marc Zyngier
2020-02-14 15:54             ` Marc Zyngier
2020-02-14 15:58             ` Pankaj Bansal
2020-02-14 15:58               ` Pankaj Bansal
2020-02-14 16:19               ` Lorenzo Pieralisi
2020-02-14 16:19                 ` Lorenzo Pieralisi
2020-02-14 16:35                 ` Pankaj Bansal
2020-02-14 16:35                   ` Pankaj Bansal
2020-02-14 17:49                   ` Lorenzo Pieralisi
2020-02-14 17:49                     ` Lorenzo Pieralisi
2020-02-17 12:35                     ` Pankaj Bansal
2020-02-17 12:35                       ` Pankaj Bansal
2020-02-17 15:25                       ` Lorenzo Pieralisi
2020-02-17 15:25                         ` Lorenzo Pieralisi
2020-02-17 15:35                         ` Marc Zyngier
2020-02-17 15:35                           ` Marc Zyngier
2020-02-17 16:26                           ` Lorenzo Pieralisi
2020-02-17 16:26                             ` Lorenzo Pieralisi
2020-02-18  8:02                         ` Pankaj Bansal (OSS)
2020-02-18  8:02                           ` Pankaj Bansal (OSS)
2020-02-14 16:29               ` Robin Murphy
2020-02-14 16:29                 ` Robin Murphy

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