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nuvoton: battery-backed ram

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Add bindings and entry for the battery-backed ram in the nuvoton
npcx. This commit is an upstream port of
https://source.chromium.org/chromiumos/chromiumos/codesearch/+/main:src/platform/ec/zephyr/dts/bindings/cros_bbram/nuvoton,npcx-cros-bbram.yaml;l=1;drc=e9af813c36b7b411bf2a01cbc1b09d5fdec49b8a

Along with a bit of cleaning up and an emulator.

Signed-off-by: Yuval Peress <peress@chromium.org>
This commit is contained in:
Yuval Peress 2021-01-25 00:51:17 -07:00 • committed by Christopher Friedt
commit 268f9bf163
19 changed files with 767 additions and 0 deletions
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8
dts/arm/nuvoton/npcx.dtsi
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@ -69,6 +69,14 @@
};
soc {
bbram: bb-ram@400af000 {
compatible = "nuvoton,npcx-bbram";
reg = <0x400af000 0x80
0x400af100 0x1>;
reg-names = "memory", "status";
label = "BBRAM";
};
pcc: clock-controller@4000d000 {
compatible = "nuvoton,npcx-pcc";
/* Cells for bus type, clock control reg and bit */