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
Changes since v1: ---------------- - rebased
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
.../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 | 125 +++++++++++++++++ drivers/reboot-mode/reboot-mode-rtc.c | 132 ++++++++++++++++++ drivers/reboot-mode/reboot-mode-uclass.c | 132 ++++++++++++++++++ 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 ++++++++ 13 files changed, 584 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