linux-kernel - [PATCH v4 0/2] ACPI: DPTF: Move INT340X enumeration from DPTF scan handler to ACPI core

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Message-ID: <20251103162516.2606158-1-srosek@google.com>
Date: Mon,  3 Nov 2025 16:25:14 +0000
From: Slawomir Rosek <srosek@...gle.com>
To: "Rafael J . Wysocki" <rafael@...nel.org>, Alex Hung <alexhung@...il.com>, 
	Hans de Goede <hansg@...nel.org>, Ilpo Jarvinen <ilpo.jarvinen@...ux.intel.com>, 
	AceLan Kao <acelan.kao@...onical.com>, Daniel Lezcano <daniel.lezcano@...aro.org>
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>, Zhang Rui <rui.zhang@...el.com>, 
	Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>, Tomasz Nowicki <tnowicki@...gle.com>, 
	Stanislaw Kardach <skardach@...gle.com>, Michal Krawczyk <mikrawczyk@...gle.com>, 
	linux-kernel@...r.kernel.org, linux-acpi@...r.kernel.org, 
	platform-driver-x86@...r.kernel.org, linux-pm@...r.kernel.org, 
	Slawomir Rosek <srosek@...gle.com>
Subject: [PATCH v4 0/2] ACPI: DPTF: Move INT340X enumeration from DPTF scan
 handler to ACPI core

The Intel Dynamic Platform and Thermal Framework (DPTF) relies on
the INT340X ACPI device objects. The temperature information and
cooling ability are exposed to the userspace via those objects.

Since kernel v3.17 the ACPI bus scan handler is introduced to prevent
enumeration of INT340X ACPI device objects on the platform bus unless
related thermal drivers are enabled. However, using the IS_ENABLED()
macro in the ACPI scan handler forces the kernel to be recompiled
when thermal drivers are enabled or disabled, which is a significant
limitation of its modularity. The IS_ENABLED() macro is particularly
problematic for the Android Generic Kernel Image (GKI) project which
uses unified core kernel while SoC/board support is moved to loadable
vendor modules.

The DPTF requires thermal drivers to be loaded at runtime, thus
ACPI bus scan handler is not needed and acpi_default_enumeration()
may create all platform devices, regardless of the actual setting
of CONFIG_INT340X_THERMAL.

Link to v1: https://lore.kernel.org/all/20250830053404.763995-1-srosek@google.com/
Link to v2: https://lore.kernel.org/all/20250917120719.2390847-1-srosek@google.com/
Link to v3: https://lore.kernel.org/all/20251002113404.3117429-1-srosek@google.com/

In v4 the SoC DTS thermal explicitly depends on the X86_64 and NET,
so the INT340X driver may safely be selected by the SoC DTS thermal
driver. In addition most of previously submitted patches are dropped
as they are not necessary, instead the ACPI bus scan handler is simply
removed from the kernel, thus all platform devices are enumerated by
the acpi_default_enumeration().

Slawomir Rosek (2):
  ACPI: DPTF: Ignore SoC DTS thermal while scanning
  ACPI: DPTF: Remove int340x thermal scan handler

 drivers/acpi/dptf/Makefile          |  1 -
 drivers/acpi/dptf/int340x_thermal.c | 94 -----------------------------
 drivers/acpi/internal.h             |  1 -
 drivers/acpi/scan.c                 |  1 -
 drivers/thermal/intel/Kconfig       |  3 +-
 5 files changed, 2 insertions(+), 98 deletions(-)
 delete mode 100644 drivers/acpi/dptf/int340x_thermal.c

-- 
2.51.1.930.gacf6e81ea2-goog