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reboot-mode: read the boot mode from RTC memory

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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>
This commit is contained in:
Nandor Han 2021-06-10 16:56:45 +03:00 • committed by Tom Rini
parent f9db2f16cb
commit c74675bd90
8 changed files with 215 additions and 0 deletions
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22
doc/device-tree-bindings/reboot-mode/reboot-mode-rtc.txt Normal file
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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>;
};