linux/Documentation/devicetree/bindings/misc/sram.txt
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Prefs
   1Generic on-chip SRAM
   2
   3Simple IO memory regions to be managed by the genalloc API.
   4
   5Required properties:
   6
   7- compatible : mmio-sram
   8
   9- reg : SRAM iomem address range
  10
  11Example:
  12
  13sram: sram@5c000000 {
  14        compatible = "mmio-sram";
  15        reg = <0x5c000000 0x40000>; /* 256 KiB SRAM at address 0x5c000000 */
  16};
  17