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Rockchip SRAM for pmu:
The sram of pmu is used to store the function of resume from maskrom(the 1st
level loader). This is a common use of the "pmu-sram" because it keeps power
even in low power states in the system.
Required node properties:
- compatible : should be "rockchip,rk3288-pmu-sram"
- reg : physical base address and the size of the registers window
sram@ff720000 {
compatible = "rockchip,rk3288-pmu-sram", "mmio-sram";
reg = <0xff720000 0x1000>;