[PATCH v4 0/3] Add reboot mode support

Nandor Han
2021-06-10T13:57:09Z

Description
-----------
Add support for reboot-mode configuration using GPIOs and RTC SRAM as
back-end.

Testing
-------

Tested on a Zynq based board where device tree was configured to contain
the reboot-mode configuration:

&amba {
status = "okay";

reboot-mode-gpio {
compatible = "reboot-mode-gpio";
gpios = <&gpio0 47 GPIO_ACTIVE_LOW>;
mode-test = <0x1>;
};

reboot-mode-rtc {
compatible = "reboot-mode-rtc";
rtc = <&rtc_0>;
reg = <0x14 4>;
mode-test = <0x21969147>;
};
};

In addition to this and not part of this patchset is a change to board.c
where GPIO or RTC SRAM backed is selected dynamically at runtime.

1. Test that the reboot mode configured in user-space is read in U-Boot and
environment configured: PASS

Userspace ~ # reboot test
....
[ 177.335936] reboot: Restarting system with command 'test'

U-Boot SPL 2019.01 (Mar 29 2019 - 10:44:22 +0000)
...
U-Boot> print reboot-mode
reboot-mode=test

2. Reset the system using the reset command and stop in U-Boot.
3. Verify that reboot-mode env variable is not configured anymore: PASS

U-Boot> print reboot-mode
## Error: "reboot-mode" not defined

4. Toggle the GPIO configured for test mode to active and reset the system
with command reset.
5. Stop in U-Boot and check that reboot-mode env variable is configured:PASS

U-Boot> print reboot-mode
reboot-mode=test

6. Verify that unit-tests are successful: PASS
```
localhost /u-boot-latest (wip-reboot-mode)> ./test/py/test.py --bd sandbox --build -k ut_dm_reboot_mode -v
...
test/py/tests/test_ut.py::test_ut[ut_dm_reboot_mode_gpio] PASSED [ 50%]
test/py/tests/test_ut.py::test_ut[ut_dm_reboot_mode_rtc] PASSED [100%]

========================================================== 2 passed, 759 deselected in 0.40 seconds ==========================================================
```

Changes since v1:
----------------
- rebased

Changes since v2:
----------------
- unit-tests added

Changes since v3:
----------------
- rebased
- fix the struct udevice and struct driver incompatibilities

Nandor Han (3):
reboot-mode: add support for reboot mode control
reboot-mode: read the boot mode from GPIOs status
reboot-mode: read the boot mode from RTC memory

arch/sandbox/dts/test.dts | 18 +++
configs/sandbox_defconfig | 3 +
.../reboot-mode/reboot-mode-gpio.txt | 20 +++
.../reboot-mode/reboot-mode-rtc.txt | 22 +++
drivers/Kconfig | 2 +
drivers/Makefile | 1 +
drivers/reboot-mode/Kconfig | 36 +++++
drivers/reboot-mode/Makefile | 9 ++
drivers/reboot-mode/reboot-mode-gpio.c | 128 +++++++++++++++++
drivers/reboot-mode/reboot-mode-rtc.c | 127 +++++++++++++++++
drivers/reboot-mode/reboot-mode-uclass.c | 134 ++++++++++++++++++
include/dm/uclass-id.h | 1 +
include/reboot-mode/reboot-mode-gpio.h | 32 +++++
include/reboot-mode/reboot-mode-rtc.h | 16 +++
include/reboot-mode/reboot-mode.h | 56 ++++++++
test/dm/Makefile | 1 +
test/dm/reboot-mode.c | 71 ++++++++++
17 files changed, 677 insertions(+)
create mode 100644 doc/device-tree-bindings/reboot-mode/reboot-mode-gpio.txt
create mode 100644 doc/device-tree-bindings/reboot-mode/reboot-mode-rtc.txt
create mode 100644 drivers/reboot-mode/Kconfig
create mode 100644 drivers/reboot-mode/Makefile
create mode 100644 drivers/reboot-mode/reboot-mode-gpio.c
create mode 100644 drivers/reboot-mode/reboot-mode-rtc.c
create mode 100644 drivers/reboot-mode/reboot-mode-uclass.c
create mode 100644 include/reboot-mode/reboot-mode-gpio.h
create mode 100644 include/reboot-mode/reboot-mode-rtc.h
create mode 100644 include/reboot-mode/reboot-mode.h
create mode 100644 test/dm/reboot-mode.c

--
2.26.3