Hi ,

? 2016?01?12? 19:27, Andy Yan ??:

This driver parse the reboot commands like "reboot loader"
and "reboot recovery" to get a boot mode described in the
device tree , then call the corresponding  write interface
to store the boot mode magic value in some persistent storage
like special register or ram , which can be read by the bootloader
after system reboot.

This is commonly used on Android based devices, which in order
to reboot the device into fastboot or recovery mode.

Before this patch , I have try some hack on[0], and then found
John Stultz also doing the same work[1].

As John is busy these days, I go on with this work.

[0]https://patchwork.kernel.org/patch/7647751/
[1]https://patchwork.kernel.org/patch/7802391/

Changes in v2:
- move to dir drivers/power/reset/
- make syscon-reboot-mode a generic driver
- make this DT node as a subnode of PMU/PMUGRF

Changes in v1:
- fix the embarrassed compile warning
- correct the maskrom magic number
- check for the normal reboot
- correct the maskrom magic number
- use macro defined in rockchip_boot-mode.h for reboot-mode DT node

Andy Yan (4):
   dt-bindings: power: reset: add document for reboot-mode driver
   power: reset: add reboot mode driver
   ARM: dts: rockchip: add syscon-reboot-mode node
   ARM64: dts: rockchip: add syscon-reboot-mode DT node

This series patches are verified by my github based on kernel 4.4 release.
https://github.com/Caesar-github/rockchip/commits/kylin-develop4.4

reboot loader, reboot recovery, reboot fastboot..... these are okay for 
rk3288, rk3368. rk3036 Socs on my hand board.
(Note: the loader need that jeffy send patches to support uboot on 
upstream,  that's also okay if you are using the RK loader from Rockchip)

I just send the patch to support the rk3036 dts. 
<https://patchwork.kernel.org/patch/8021581/>

So feel free add my test tags:

Tested-by: Caesar Wang <redacted>

  .../bindings/power/reset/reboot-mode.txt           |  41 +++++++++
  .../bindings/power/reset/syscon-reboot-mode.txt    |  52 +++++++++++
  arch/arm/boot/dts/rk3288.dtsi                      |  31 +++++++
  arch/arm/boot/dts/rk3xxx.dtsi                      |  33 ++++++-
  arch/arm64/boot/dts/rockchip/rk3368.dtsi           |  33 ++++++-
  drivers/power/reset/Kconfig                        |  16 ++++
  drivers/power/reset/Makefile                       |   2 +
  drivers/power/reset/reboot-mode.c                  | 100 +++++++++++++++++++++
  drivers/power/reset/reboot-mode.h                  |   6 ++
  drivers/power/reset/syscon-reboot-mode.c           |  62 +++++++++++++
  include/dt-bindings/soc/rockchip_boot-mode.h       |  30 +++++++
  11 files changed, 404 insertions(+), 2 deletions(-)
  create mode 100644 Documentation/devicetree/bindings/power/reset/reboot-mode.txt
  create mode 100644 Documentation/devicetree/bindings/power/reset/syscon-reboot-mode.txt
  create mode 100644 drivers/power/reset/reboot-mode.c
  create mode 100644 drivers/power/reset/reboot-mode.h
  create mode 100644 drivers/power/reset/syscon-reboot-mode.c
  create mode 100644 include/dt-bindings/soc/rockchip_boot-mode.h

-- 
Thanks,
Caesar