linux-kernel - Re: [PATCH v2] ACPI: Documentation: driver-api: Disapprove of using ACPI drivers

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Message-Id: <DFHK7ZS7H7LJ.1POCUDPSLC3CP@kernel.org>
Date: Tue, 06 Jan 2026 15:01:34 +0100
From: "Danilo Krummrich" <dakr@...nel.org>
To: "Rafael J. Wysocki" <rafael@...nel.org>
Cc: "Linux ACPI" <linux-acpi@...r.kernel.org>, "LKML"
 <linux-kernel@...r.kernel.org>, "Andy Shevchenko"
 <andriy.shevchenko@...ux.intel.com>, "Bjorn Helgaas" <helgaas@...nel.org>,
 "Greg Kroah-Hartman" <gregkh@...uxfoundation.org>, "Hans de Goede"
 <hansg@...nel.org>, "Linux Documentation" <linux-doc@...r.kernel.org>,
 "Mika Westerberg" <mika.westerberg@...ux.intel.com>, "Zhang Rui"
 <rui.zhang@...el.com>, "Armin Wolf" <w_armin@....de>, "Ilpo Jarvinen"
 <ilpo.jarvinen@...ux.intel.com>, "Mario Limonciello"
 <mario.limonciello@....com>, "Randy Dunlap" <rdunlap@...radead.org>
Subject: Re: [PATCH v2] ACPI: Documentation: driver-api: Disapprove of using
 ACPI drivers

On Tue Jan 6, 2026 at 1:27 PM CET, Rafael J. Wysocki wrote:
> +This means that it really should never be necessary to bind a driver directly to
> +an ACPI device node because there is a "proper" device object representing the
> +corresponding piece of hardware that can be bound to by a "proper" driver using
> +the given ACPI device node as the device's ACPI companion.  Thus, in principle,
> +there is no reason to use ACPI drivers and if they all were replaced with other
> +driver types (for example, platform drivers), some code could be dropped and
> +some complexity would go away.

I think it would be good to explicitly encourage people to convert existing
drivers (maybe even list some of those) and rephrase the last sentence to list
what exact infrastructure, complexity, etc. can go away once that happened.

I think this would make it more likely to receive some contributions towards
this goal.