linux-kernel - Re: [PATCH RFC] timer: of: Create a platform_device before the framework is initialized

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Message-ID: <36970a28-44e7-4e54-b22b-fc7524bd2a08@linaro.org>
Date: Thu, 10 Jul 2025 12:54:20 +0200
From: Daniel Lezcano <daniel.lezcano@...aro.org>
To: Arnd Bergmann <arnd@...db.de>
Cc: William McVicker <willmcvicker@...gle.com>,
 Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
 linux-kernel@...r.kernel.org,
 Lorenzo Pieralisi <lorenzo.pieralisi@...aro.org>,
 Hans de Goede <hansg@...nel.org>,
 Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>,
 Bryan O'Donoghue <bryan.odonoghue@...aro.org>, Rob Herring
 <robh@...nel.org>, Thomas Gleixner <tglx@...utronix.de>,
 John Stultz <jstultz@...gle.com>, Stephen Boyd <sboyd@...nel.org>,
 Saravana Kannan <saravanak@...gle.com>,
 Linux-Arch <linux-arch@...r.kernel.org>,
 "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE"
 <devicetree@...r.kernel.org>
Subject: Re: [PATCH RFC] timer: of: Create a platform_device before the
 framework is initialized

On 08/07/2025 18:10, Arnd Bergmann wrote:

[ ... ]

> The way I had expected this to work was that TIMER_OF_DECLARE_PDEV()
> always registers the platform_driver and just skips the
> section magic when it's in a loadable module.

Yes it would be a nice change, but it seems to be not possible for the 
early + builtin + module combination we have AFAICS.

What about to have two macros:

/*
  * Declares module_platform_driver
  * Assigns __driver.driver.of_match_table = __of_match
  * Assigns __driver.driver.name = __name
  */
TIMER_OF_DECLARE_PLATFORM_DRIVER(__name, __driver, __of_match)

/*
  * Does the same as the above but if MODULE is not set then then we
  * end up with timer-probe() instead of builtin_platform_driver
  */
TIMER_OF_DECLARE_EARLY_PLATFORM_DRIVER(__name, __driver, __of_match)

So when someone is converting a driver into a module, it can change the 
driver to use these macros instead.


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