linux-kernel - [PATCH v1 0/6] Add module support for Arm64 Exynos MCT driver

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Message-ID: <20250331230034.806124-1-willmcvicker@google.com>
Date: Mon, 31 Mar 2025 16:00:22 -0700
From: Will McVicker <willmcvicker@...gle.com>
To: Catalin Marinas <catalin.marinas@....com>, Will Deacon <will@...nel.org>, 
	Peter Griffin <peter.griffin@...aro.org>, 
	"André Draszik" <andre.draszik@...aro.org>, Tudor Ambarus <tudor.ambarus@...aro.org>, 
	Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley <conor+dt@...nel.org>, 
	Alim Akhtar <alim.akhtar@...sung.com>, Daniel Lezcano <daniel.lezcano@...aro.org>, 
	Thomas Gleixner <tglx@...utronix.de>, Saravana Kannan <saravanak@...gle.com>
Cc: Will McVicker <willmcvicker@...gle.com>, kernel-team@...roid.com, 
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org, 
	linux-samsung-soc@...r.kernel.org, devicetree@...r.kernel.org
Subject: [PATCH v1 0/6] Add module support for Arm64 Exynos MCT driver

This series adds support to build the Arm64 Exynos MCT driver as a module. This
is only possible on Arm64 SoCs since they can use the Arm architected timer as
the clocksource. Once the Exynos MCT module is loaded and the device probes,
the MCT driver is used as the wakeup source for the arch_timer.

These patches are originally from the downstream Pixel 6 (gs101) kernel found
at [1] and have been adapted for upstream. Not only has the Exynos MCT driver
been shipping as a module in the field with Android, but I've also tested this
seris with the upstream kernel on my Pixel 6 Pro.

Thanks,
Will

Note1, instructions to build and flash a Pixel 6 device with the upstream kernel
can be found at [2].

Note2, this series is based off of linux-next/master commit 405e2241def8 ("Add
linux-next specific files for 20250331").

[1] https://android.googlesource.com/kernel/gs/+log/refs/heads/android-gs-raviole-5.10-android12-d1
[2] https://git.codelinaro.org/linaro/googlelt/pixelscripts/-/blob/clo/main/README.md?ref_type=heads

Donghoon Yu (1):
  clocksource/drivers/exynos_mct: Add module support

Hosung Kim (1):
  clocksource/drivers/exynos_mct: Set local timer interrupts as percpu

Will Deacon (1):
  arm64: dts: exynos: gs101: Add 'local-timer-stop' to cpuidle nodes

Will McVicker (3):
  of/irq: Export of_irq_count for modules
  clocksource/drivers/exynos_mct: Don't register as a sched_clock on
    arm64
  arm64: exynos: Drop select CLKSRC_EXYNOS_MCT

 arch/arm64/Kconfig.platforms                 |  1 -
 arch/arm64/boot/dts/exynos/google/gs101.dtsi |  3 ++
 drivers/clocksource/Kconfig                  |  3 +-
 drivers/clocksource/exynos_mct.c             | 55 ++++++++++++++++----
 drivers/of/irq.c                             |  1 +
 5 files changed, 51 insertions(+), 12 deletions(-)

-- 
2.49.0.472.ge94155a9ec-goog