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u-boot/doc/device-tree-bindings/bootcount-syscon.txt
Nandor Han c50b21b705 bootcount: add a new driver with syscon as backend
The driver will use a syscon regmap as backend and supports both
16 and 32 size value. The value will be stored in the CPU's endianness.

Signed-off-by: Nandor Han <nandor.han@vaisala.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
2021-08-22 11:04:52 +02:00

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Bootcount Configuration
This is the implementation of the feature as described in
https://www.denx.de/wiki/DULG/UBootBootCountLimit.
Required Properties:
- compatible: must be "u-boot,bootcount-syscon".
- syscon: reference to the syscon device used.
- reg: contains address and size of the register and the location and size of the bootcount value.
The driver supports a 4 bytes register length and 2 and 4 bytes bootcount value length.
- reg-names: must be "syscon_reg", "offset";
Example:
...
syscon0: syscon@0 {
compatible = "sandbox,syscon0";
reg = <0x10 16>;
};
...
bootcount@0 {
compatible = "u-boot,bootcount-syscon";
syscon = <&syscon0>;
reg = <0x0 0x04>, <0x0 0x04>;
reg-names = "syscon_reg", "offset";
};