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From: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
To: Andrew Lunn <andrew@lunn.ch>
Cc: Marcin Wojtas <mw@semihalf.com>,
	linux-kernel@vger.kernel.org, linux-acpi@vger.kernel.org,
	netdev@vger.kernel.org, rafael@kernel.org, lenb@kernel.org,
	vivien.didelot@gmail.com, f.fainelli@gmail.com,
	olteanv@gmail.com, davem@davemloft.net, edumazet@google.com,
	kuba@kernel.org, pabeni@redhat.com, linux@armlinux.org.uk,
	hkallweit1@gmail.com, gjb@semihalf.com, jaz@semihalf.com,
	tn@semihalf.com, Samer.El-Haj-Mahmoud@arm.com,
	upstream@semihalf.com
Subject: Re: [net-next: PATCH 00/12] ACPI support for DSA
Date: Mon, 20 Jun 2022 21:07:32 +0300	[thread overview]
Message-ID: <YrC3ZKsMQK3PYKkR@smile.fi.intel.com> (raw)
In-Reply-To: <YrC0oKdDSjQTgUtM@lunn.ch>

On Mon, Jun 20, 2022 at 07:55:44PM +0200, Andrew Lunn wrote:
> On Mon, Jun 20, 2022 at 05:02:13PM +0200, Marcin Wojtas wrote:

...

> > It turned out that without much hassle it is possible to describe
> > DSA-compliant switches as child devices of the MDIO busses, which are
> > responsible for their enumeration based on the standard _ADR fields and
> > description in _DSD objects under 'device properties' UUID [1].
> 
> No surprises there. That is how the DT binding works. And the current
> ACPI concept is basically DT in different words. Maybe the more
> important question is, is rewording DT in ACPI the correct approach,
> or should you bo doing a more native ACPI implementation? I cannot
> answer that, you need to ask the ACPI maintainers.

You beat me up to this. I also was about to mention that the problem with such
conversions (like this series does) is not in the code. It's simplest part. The
problem is bindings and how you get them to be a standard (at least de facto).

> > Note that for now cascade topology remains unsupported in ACPI world
> > (based on "dsa" label and "link" property values). It seems to be feasible,
> > but would extend this patchset due to necessity of of_phandle_iterator
> > migration to fwnode_. Leave it as a possible future step.
> 
> We really do need to ensure this is possible. You are setting an ABI
> here, which everybody else in the ACPI world needs to follow. Cascaded
> switches is fundamental to DSA, it is the D in DSA. So i would prefer
> that you at least define and document the binding for D in DSA and get
> it sanity checked by the ACPI people.

-- 
With Best Regards,
Andy Shevchenko



  reply	other threads:[~2022-06-20 18:07 UTC|newest]

Thread overview: 84+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-06-20 15:02 [net-next: PATCH 00/12] ACPI support for DSA Marcin Wojtas
2022-06-20 15:02 ` [net-next: PATCH 01/12] net: phy: fixed_phy: switch to fwnode_ API Marcin Wojtas
2022-06-20 17:25   ` Andy Shevchenko
2022-06-20 17:59   ` Andrew Lunn
2022-06-21  9:56     ` Marcin Wojtas
2022-06-21 10:01       ` Russell King (Oracle)
2022-06-20 15:02 ` [net-next: PATCH 02/12] net: mdio: switch fixed-link PHYs API to fwnode_ Marcin Wojtas
2022-06-20 17:32   ` Andy Shevchenko
2022-06-21  9:22     ` Marcin Wojtas
2022-06-20 15:02 ` [net-next: PATCH 03/12] net: dsa: switch to device_/fwnode_ APIs Marcin Wojtas
2022-06-20 17:41   ` Andy Shevchenko
2022-06-21  9:27     ` Marcin Wojtas
2022-06-21 11:02       ` Andy Shevchenko
2022-06-22 16:09         ` Florian Fainelli
2022-06-20 15:02 ` [net-next: PATCH 04/12] net: mvpp2: initialize port fwnode pointer Marcin Wojtas
2022-06-20 17:43   ` Andy Shevchenko
2022-06-20 17:44     ` Andy Shevchenko
2022-06-21  9:28       ` Marcin Wojtas
2022-06-20 15:02 ` [net-next: PATCH 05/12] net: core: switch to fwnode_find_net_device_by_node() Marcin Wojtas
2022-06-20 17:46   ` Andy Shevchenko
2022-06-20 23:15     ` Marcin Wojtas
2022-06-20 22:30   ` kernel test robot
2022-06-20 15:02 ` [net-next: PATCH 06/12] net: mdio: introduce fwnode_mdiobus_register_device() Marcin Wojtas
2022-06-20 17:48   ` Andy Shevchenko
2022-06-21  9:33     ` Marcin Wojtas
2022-06-20 15:02 ` [net-next: PATCH 07/12] net: mdio: allow registering non-PHY devices in ACPI world Marcin Wojtas
2022-06-20 15:02 ` [net-next: PATCH 08/12] ACPI: scan: prevent double enumeration of MDIO bus children Marcin Wojtas
2022-06-20 17:53   ` Andy Shevchenko
2022-06-20 23:04     ` Marcin Wojtas
2022-06-22 12:09       ` Rafael J. Wysocki
2022-06-22 15:05         ` Marcin Wojtas
2022-06-20 19:08   ` Andrew Lunn
2022-06-22 12:05     ` Rafael J. Wysocki
2022-06-22 16:12       ` Florian Fainelli
2022-06-22 16:21         ` Rafael J. Wysocki
2022-06-23  7:41           ` Andrew Lunn
2022-06-23 23:07             ` Marcin Wojtas
2022-06-20 15:02 ` [net-next: PATCH 09/12] Documentation: ACPI: DSD: introduce DSA description Marcin Wojtas
2022-06-20 18:19   ` Andrew Lunn
2022-06-20 23:21     ` Marcin Wojtas
2022-06-20 19:47   ` Andrew Lunn
2022-06-20 23:25     ` Marcin Wojtas
2022-06-21 11:09     ` Andy Shevchenko
2022-06-21 11:18       ` Andrew Lunn
2022-06-21 11:42         ` Andy Shevchenko
2022-06-22  9:08           ` Marcin Wojtas
2022-06-22  9:24             ` Andrew Lunn
2022-06-22 10:22               ` Marcin Wojtas
2022-06-22 10:37                 ` Andrew Lunn
2022-06-22 11:08                   ` Andy Shevchenko
2022-06-22 11:04               ` Andy Shevchenko
2022-06-22 11:03             ` Andy Shevchenko
2022-06-22 11:22               ` Andrew Lunn
2022-06-22 14:20                 ` Andy Shevchenko
2022-06-22 15:00                   ` Marcin Wojtas
2022-06-21  9:45   ` Sudeep Holla
2022-06-21 11:15     ` Andy Shevchenko
2022-06-21 11:24       ` Andrew Lunn
2022-06-21 11:46         ` Andy Shevchenko
2022-06-21 11:57           ` Andrew Lunn
2022-06-21 13:28         ` Sudeep Holla
2022-06-21 15:23           ` Rafael J. Wysocki
2022-06-21 15:37             ` Sudeep Holla
2022-06-21 16:00               ` Rafael J. Wysocki
2022-06-21 18:11                 ` Sudeep Holla
2022-06-20 15:02 ` [net-next: PATCH 10/12] net: dsa: add ACPI support Marcin Wojtas
2022-06-20 18:32   ` Andrew Lunn
2022-06-20 23:31     ` Marcin Wojtas
2022-06-20 15:02 ` [net-next: PATCH 11/12] net: dsa: mv88e6xxx: switch to device_/fwnode_ APIs Marcin Wojtas
2022-06-20 18:00   ` Andy Shevchenko
2022-06-21  9:14     ` Marcin Wojtas
2022-06-20 18:04   ` Andy Shevchenko
2022-06-21  9:15     ` Marcin Wojtas
2022-06-20 15:02 ` [net-next: PATCH 12/12] net: dsa: mv88e6xxx: add ACPI support Marcin Wojtas
2022-06-25  2:54   ` kernel test robot
2022-06-20 17:21 ` [net-next: PATCH 00/12] ACPI support for DSA Andy Shevchenko
2022-06-21 10:02   ` Marcin Wojtas
2022-06-20 17:55 ` Andrew Lunn
2022-06-20 18:07   ` Andy Shevchenko [this message]
2022-06-20 18:45     ` Andrew Lunn
2022-06-21 10:46       ` Marcin Wojtas
2022-06-22 15:40         ` Marcin Wojtas
2022-06-22 16:14           ` Andy Shevchenko
2022-06-21 10:16   ` Marcin Wojtas

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