power: reset: add MCF5441x RCM power-on reason driver

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Add a driver that decodes the Reset Status Register (RSR) of the
Freescale ColdFire MCF5441x Reset Controller Module at probe time
and exposes the cause via the power_on_reason sysfs ABI.

The RSR can latch several cause bits simultaneously (Reference
Manual chapter 12.3.2); the driver picks one cause per a priority
that favours the most explanatory diagnostic.

The register layout is described in the driver so it can be built
with COMPILE_TEST on any architecture.

Signed-off-by: Jean-Michel Hautbois <jeanmichel.hautbois@yoseli.org>
Link: https://patch.msgid.link/20260617-coldfire-rcm-power-on-reason-v3-1-1a7c7b6b14e7@yoseli.org
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>

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Jean-Michel Hautbois 2026-06-17 21:17:15 +02:00 • committed by Sebastian Reichel

parent 48355ce493

commit 380f91cdbd

4 changed files with 145 additions and 0 deletions

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6

MAINTAINERS

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12

drivers/power/reset/Kconfig

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1

drivers/power/reset/Makefile

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126

drivers/power/reset/mcf-rcm-reset.c

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