* Renesas SMP SRAM

Renesas R-Car Gen2 and RZ/G1 SoCs need a small piece of SRAM for the jump stub
for secondary CPU bringup and CPU hotplug.
This memory is reserved by adding a child node to a "mmio-sram" node, cfr.
Documentation/devicetree/bindings/sram/sram.txt.

Required child node properties:
  - compatible: Must be "renesas,smp-sram",
  - reg: Address and length of the reserved SRAM.
    The full physical (bus) address must be aligned to a 256 KiB boundary.


Example:

	icram1:	sram@e63c0000 {
		compatible = "mmio-sram";
		reg = <0 0xe63c0000 0 0x1000>;
		#address-cells = <1>;
		#size-cells = <1>;
		ranges = <0 0 0xe63c0000 0x1000>;

		smp-sram@0 {
			compatible = "renesas,smp-sram";
			reg = <0 0x10>;
		};
	};