driver: reset: spacemit-p1: add driver for poweroff/reboot

[Aurelien Jarno]

This adds poweroff/reboot support for the SpacemiT P1 PMIC chip, which is
commonly paired with the SpacemiT K1 SoC.

Note: For reliable operation, this driver depends on a separate patch series
that adds atomic transfer support to the SpacemiT I2C controller driver:
https://lore.kernel.org/spacemit/48B175EBF0F1A347+aNXwqlO1mD-7BGtE@xxxxxxxxxx/T/#t
The two fixes mentioned there are also required:
https://lore.kernel.org/spacemit/aNbDkn9AC4FFx-Zc@xxxxxxxxxxx/

Aurelien Jarno (2):
  driver: reset: spacemit-p1: add driver for poweroff/reboot
  mfd: simple-mfd-i2c: add a reboot cell for the SpacemiT P1 chip

 drivers/mfd/simple-mfd-i2c.c             |  1 +
 drivers/power/reset/Kconfig              |  9 +++
 drivers/power/reset/Makefile             |  1 +
 drivers/power/reset/spacemit-p1-reboot.c | 88 ++++++++++++++++++++++++
 4 files changed, 99 insertions(+)
 create mode 100644 drivers/power/reset/spacemit-p1-reboot.c

-- 
2.47.2