[PATCH 0/3] Coldfire m5441x: add RCM power-on reason driver

This series adds a power_on_reason driver for the Freescale ColdFire
MCF5441x Reset Controller Module.

The MCF5441x has six documented sources of reset (power-on, external
pin, software, PLL loss-of-clock, PLL loss-of-lock and core watchdog
timeout). They are latched in the Reset Status Register (RSR) at
0xec090001. The new driver decodes that register once at probe time
and exposes the result through the power_on_reason sysfs ABI.

Patch 1 adds the missing RSR bit definitions. Patch 2 is the driver.
Patch 3 registers the platform device at the SoC level so every
MCF5441x board picks the driver up automatically.

The driver is scoped to MCF5441x. Other ColdFire variants document an
RSR at different addresses with different bit layouts; covering them
is left for follow-up patches by anyone with the relevant boards.

Tested on a MCF5441x board: after sysrq-b, the sysfs attribute
reports "software reset".

Signed-off-by: Jean-Michel Hautbois <[email protected]>
---
Jean-Michel Hautbois (3):
      m68k: coldfire/5441x: define RSR cause bits
      power: reset: add MCF5441x RCM power-on reason driver
      m68k: coldfire/5441x: register mcf-rcm-reset platform device

 MAINTAINERS                         |   6 ++
 arch/m68k/coldfire/m5441x.c         |  25 +++++++++
 arch/m68k/include/asm/m5441xsim.h   |   7 +++
 drivers/power/reset/Kconfig         |  12 ++++
 drivers/power/reset/Makefile        |   1 +
 drivers/power/reset/mcf-rcm-reset.c | 109 ++++++++++++++++++++++++++++++++++++
 6 files changed, 160 insertions(+)
---
base-commit: eb3f4b7426cfd2b79d65b7d37155480b32259a11
change-id: 20260528-coldfire-rcm-power-on-reason-7a234acfdddd

Best regards,
--  
Jean-Michel Hautbois <[email protected]>