| Tom Rini | 53633a8 | 2024-02-29 12:33:36 -0500 | [diff] [blame] | 1 | * IBM Powerpc Virtual Accelerator Switchboard (VAS) |
| 2 | |
| 3 | VAS is a hardware mechanism that allows kernel subsystems and user processes |
| 4 | to directly submit compression and other requests to Nest accelerators (NX) |
| 5 | or other coprocessors functions. |
| 6 | |
| 7 | Required 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 | |
| 15 | Example: |
| 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 | }; |