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1* IBM Powerpc Virtual Accelerator Switchboard (VAS)2 3VAS is a hardware mechanism that allows kernel subsystems and user processes4to directly submit compression and other requests to Nest accelerators (NX)5or other coprocessors functions.6 7Required properties:8- compatible : should be "ibm,vas".9- ibm,vas-id : A unique identifier for each instance of VAS in the system10- reg : Should contain 4 pairs of 64-bit fields specifying the Hypervisor11 window context start and length, OS/User window context start and length,12 "Paste address" start and length, "Paste window id" start bit and number13 of bits)14 15Example:16 17 vas@6019100000000 {18 compatible = "ibm,vas", "ibm,power9-vas";19 reg = <0x6019100000000 0x2000000 0x6019000000000 0x100000000 0x8000000000000 0x100000000 0x20 0x10>;20 name = "vas";21 ibm,vas-id = <0x1>;22 };23