From c74675bd904b6ce9d5820a80f27793c0583fd54c Mon Sep 17 00:00:00 2001 From: Nandor Han Date: Thu, 10 Jun 2021 16:56:45 +0300 Subject: reboot-mode: read the boot mode from RTC memory RTC devices could provide battery-backed memory that can be used for storing the reboot mode magic value. Add a new reboot-mode back-end that uses RTC to store the reboot-mode magic value. The driver also supports both endianness modes. Signed-off-by: Nandor Han Reviewed-by: Simon Glass --- .../reboot-mode/reboot-mode-rtc.txt | 22 ++++++++++++++++++++++ 1 file changed, 22 insertions(+) create mode 100644 doc/device-tree-bindings/reboot-mode/reboot-mode-rtc.txt (limited to 'doc') diff --git a/doc/device-tree-bindings/reboot-mode/reboot-mode-rtc.txt b/doc/device-tree-bindings/reboot-mode/reboot-mode-rtc.txt new file mode 100644 index 0000000000..23aa12c88c --- /dev/null +++ b/doc/device-tree-bindings/reboot-mode/reboot-mode-rtc.txt @@ -0,0 +1,22 @@ +RTC Reboot Mode Configuration + +Required Properties: +- compatible: must be "reboot-mode-rtc". +- rtc: reference to the rtc device used. +- reg: start register and the number of bytes used. Maximum 4 bytes supported. +- modes: list of properties that define the modes and associated unique ids. + +Optional Properties: +- u-boot,env-variable: used to save the reboot mode (default: reboot-mode). +- big-endian: if the magic value is stored in big-endian. (default: false). + +Example: + reboot-mode-rtc { + compatible = "reboot-mode-rtc"; + rtc = <&rtc_0>; + reg = <0x14 4>; + u-boot,env-variable = "bootstatus"; + big-endian; + modes-test = <0x21969147>; + modes-download = <0x51939147>; + }; -- cgit v1.2.3