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| author | Nandor Han <nandor.han@vaisala.com> | 2021-06-10 16:56:45 +0300 |
|---|---|---|
| committer | Tom Rini <trini@konsulko.com> | 2021-07-23 10:16:39 -0400 |
| commit | c74675bd904b6ce9d5820a80f27793c0583fd54c (patch) | |
| tree | b9b6e93ebe0d54334e3bf96b70e6a556a01a0f7c /doc | |
| parent | f9db2f16cb6fc7b6d05b0e70de65881bc97ba5c2 (diff) | |
| download | u-boot-c74675bd904b6ce9d5820a80f27793c0583fd54c.zip u-boot-c74675bd904b6ce9d5820a80f27793c0583fd54c.tar.gz u-boot-c74675bd904b6ce9d5820a80f27793c0583fd54c.tar.bz2 | |
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 <nandor.han@vaisala.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Diffstat (limited to 'doc')
| -rw-r--r-- | doc/device-tree-bindings/reboot-mode/reboot-mode-rtc.txt | 22 |
1 files changed, 22 insertions, 0 deletions
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 0000000..23aa12c --- /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>; + }; |