Document optional property "riscv,hart-indexes" Risc-V APLIC specification defines "hart index" in [1]: Within a given interrupt domain, each of the domain’s harts has a unique index number in the range 0 to 2^14 − 1 (= 16,383). The index number a domain associates with a hart may or may not have any relationship to the unique hart identifier (“hart ID”) that the RISC-V Privileged Architecture assigns to the hart. Two different interrupt domains may employ entirely different index numbers for the same set of harts. Further, this document says in "4.5 Memory-mapped control region for an interrupt domain": The array of IDC structures may include some for potential hart index numbers that are not actual hart index numbers in the domain. For example, the first IDC structure is always for hart index 0, but 0 is not necessarily a valid index number for any hart in the domain. Support arbitrary hart indexes specified in optional APLIC property "riscv,hart-indexes" that should be array of u32 elements, one per interrupt target. If this property not specified, fallback is to use logical hart indexes within the domain. [1]: https://github.com/riscv/riscv-aia Signed-off-by: Vladimir Kondratiev <vladimir.kondratiev@xxxxxxxxxxxx> Reviewed-by: Anup Patel <anup@xxxxxxxxxxxxxx> --- .../bindings/interrupt-controller/riscv,aplic.yaml | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/Documentation/devicetree/bindings/interrupt-controller/riscv,aplic.yaml b/Documentation/devicetree/bindings/interrupt-controller/riscv,aplic.yaml index 190a6499c932..bef00521d5da 100644 --- a/Documentation/devicetree/bindings/interrupt-controller/riscv,aplic.yaml +++ b/Documentation/devicetree/bindings/interrupt-controller/riscv,aplic.yaml @@ -91,6 +91,14 @@ properties: Firmware must configure interrupt delegation registers based on interrupt delegation list. + riscv,hart-indexes: + $ref: /schemas/types.yaml#/definitions/uint32-array + minItems: 1 + maxItems: 16384 + description: + A list of hart indexes that APLIC should use to address each hart + that is mentioned in the "interrupts-extended" + dependencies: riscv,delegation: [ "riscv,children" ] -- 2.43.0
