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From: Rob Herring <robh+dt@kernel.org>
To: Bartosz Golaszewski <brgl@bgdev.pl>
Cc: Sekhar Nori <nsekhar@ti.com>, Kevin Hilman <khilman@kernel.org>,
David Lechner <david@lechnology.com>,
Michael Turquette <mturquette@baylibre.com>,
Stephen Boyd <sboyd@kernel.org>, Arnd Bergmann <arnd@arndb.de>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Mark Rutland <mark.rutland@arm.com>,
Yoshinori Sato <ysato@users.sourceforge.jp>,
Rich Felker <dalias@libc.org>,
Frank Rowand <frowand.list@gmail.com>,
"Rafael J . Wysocki" <rafael.j.wysocki@intel.com>,
Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>,
Dmitry Torokhov <dmitry.torokhov@gmail.com>,
Arend van Spriel <aspriel@gmail.com>,
Heikki Krogerus <heikki.krogerus@linux.intel.com>,
Michal Suchanek <msuchanek@suse.de>,
Jan Kiszka <jan.kiszka@siemens.com>,
Andy Shevchenko <andy.shevchenko@gmail.com>,
"moderated list:ARM/FREESCALE IMX / MXC ARM ARCHITECTURE"
<linux-arm-kernel@lists.infradead.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
devicetree@vger.kernel.org,
Bartosz Golaszewski <bgolaszewski@baylibre.com>
Subject: Re: [PATCH 00/11] platform: device tree support for early platform drivers
Date: Tue, 24 Apr 2018 14:39:44 -0500 [thread overview]
Message-ID: <CAL_JsqLcoPK-dDWjwrS82RRG-WLKePfDgHJcBKRQWZG5PszrKg@mail.gmail.com> (raw)
In-Reply-To: <20180424173051.15099-1-brgl@bgdev.pl>
On Tue, Apr 24, 2018 at 12:30 PM, Bartosz Golaszewski <brgl@bgdev.pl> wrote:
> From: Bartosz Golaszewski <bgolaszewski@baylibre.com>
>
> Device tree based systems often use OF_DECLARE() macros for devices
> that need to be initialized early in the boot process such as clocks,
> timers etc. However platform devices are more desirable.
Yes, platform devices would be more desirable, but ...
>
> This series aims at introducing support for early platform drivers for
> OF-based systems.
... the whole early_platform_device infrastructure is not really a
platform_device. Rather it kind of looks like one and I guess gets
converted over during boot.
This is not the first attempt to add DT support to early platform
devices[1]. I think the same objections still apply. It has been
pretty much only an SH thing (which as an arch, I'm told is pretty
much unmaintained and broken).
> The idea is to have a special compatible fallback string: "earlydev"
> that similarily to "syscon" would be added to device nodes that need
> early probing. We then need to call of_early_platform_populate() early
> in the boot process to actually probe the registered devices.
Others have sufficiently explained why this won't fly for DT, so I
don't have more to add.
Rob
[1] http://lists.infradead.org/pipermail/linux-arm-kernel/2011-June/054529.html
prev parent reply other threads:[~2018-04-24 19:39 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-04-24 17:30 Bartosz Golaszewski
2018-04-24 17:30 ` [PATCH 01/11] platform: early: provide early_platform_add_device() Bartosz Golaszewski
2018-04-24 17:30 ` [PATCH 02/11] platform: provide early_platform_driver_register_probe_all() Bartosz Golaszewski
2018-04-24 17:30 ` [PATCH 03/11] platform: make support for early platform devices conditional Bartosz Golaszewski
2018-04-24 19:31 ` Randy Dunlap
2018-04-25 14:02 ` Rich Felker
2018-04-24 17:30 ` [PATCH 04/11] of: platform: use pdev as name for vars of type struct platform_device Bartosz Golaszewski
2018-04-24 17:30 ` [PATCH 05/11] platform: use a dedicated list_head for early devices Bartosz Golaszewski
2018-04-26 4:27 ` kbuild test robot
2018-04-24 17:30 ` [PATCH 06/11] of: provide for_each_compatible_child_node() Bartosz Golaszewski
2018-04-24 17:30 ` [PATCH 07/11] dt-bindings: add bindings for early devices Bartosz Golaszewski
2018-04-24 17:30 ` [PATCH 08/11] of: platform: provide of_early_platform_populate() Bartosz Golaszewski
2018-04-24 17:30 ` [PATCH 09/11] platform: provide early_platform_driver() Bartosz Golaszewski
2018-04-24 17:30 ` [PATCH 10/11] of: platform: provide of_early_platform_probe() Bartosz Golaszewski
2018-04-26 3:46 ` kbuild test robot
2018-04-24 17:30 ` [PATCH 11/11] misc: implement a dummy early platform driver Bartosz Golaszewski
2018-04-24 17:55 ` [PATCH 00/11] platform: device tree support for early platform drivers Mark Rutland
2018-04-24 17:59 ` Rich Felker
2018-04-24 17:57 ` Rich Felker
2018-04-25 9:33 ` Bartosz Golaszewski
2018-04-24 18:19 ` Robin Murphy
2018-04-24 19:39 ` Rob Herring [this message]
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