1* IBM Powerpc Virtual Accelerator Switchboard (VAS) 2 3VAS is a hardware mechanism that allows kernel subsystems and user processes 4to 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 system 10- reg : Should contain 4 pairs of 64-bit fields specifying the Hypervisor 11 window context start and length, OS/User window context start and length, 12 "Paste address" start and length, "Paste window id" start bit and number 13 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