162306a36Sopenharmony_ci* IBM Powerpc Virtual Accelerator Switchboard (VAS) 262306a36Sopenharmony_ci 362306a36Sopenharmony_ciVAS is a hardware mechanism that allows kernel subsystems and user processes 462306a36Sopenharmony_cito directly submit compression and other requests to Nest accelerators (NX) 562306a36Sopenharmony_cior other coprocessors functions. 662306a36Sopenharmony_ci 762306a36Sopenharmony_ciRequired properties: 862306a36Sopenharmony_ci- compatible : should be "ibm,vas". 962306a36Sopenharmony_ci- ibm,vas-id : A unique identifier for each instance of VAS in the system 1062306a36Sopenharmony_ci- reg : Should contain 4 pairs of 64-bit fields specifying the Hypervisor 1162306a36Sopenharmony_ci window context start and length, OS/User window context start and length, 1262306a36Sopenharmony_ci "Paste address" start and length, "Paste window id" start bit and number 1362306a36Sopenharmony_ci of bits) 1462306a36Sopenharmony_ci 1562306a36Sopenharmony_ciExample: 1662306a36Sopenharmony_ci 1762306a36Sopenharmony_ci vas@6019100000000 { 1862306a36Sopenharmony_ci compatible = "ibm,vas", "ibm,power9-vas"; 1962306a36Sopenharmony_ci reg = <0x6019100000000 0x2000000 0x6019000000000 0x100000000 0x8000000000000 0x100000000 0x20 0x10>; 2062306a36Sopenharmony_ci name = "vas"; 2162306a36Sopenharmony_ci ibm,vas-id = <0x1>; 2262306a36Sopenharmony_ci }; 23