Zic64b mandates that cache blocks are 64 bytes in size and naturally aligned in the address space. It is a mandatory extension of both the RVA22 (U64/S64) and RVA23 (U64/S64) profiles, ratified with RISC-V Profiles Version 1.0.
Document it so it can be described in the riscv,isa-extensions property, alongside the related Zicbom/Zicbop/Zicboz cache-block extensions. As Zic64b is the architectural guarantee that the cache block size is 64 bytes, also require a hart that advertises it to report cbom/cbop/cboz block sizes of 64, so dtbs_check rejects an inconsistent description. Signed-off-by: Guodong Xu <[email protected]> --- v3: New patch. --- .../devicetree/bindings/riscv/extensions.yaml | 20 ++++++++++++++++++++ 1 file changed, 20 insertions(+) diff --git a/Documentation/devicetree/bindings/riscv/extensions.yaml b/Documentation/devicetree/bindings/riscv/extensions.yaml index 2b0a8a93bb214..ec1c9473d4256 100644 --- a/Documentation/devicetree/bindings/riscv/extensions.yaml +++ b/Documentation/devicetree/bindings/riscv/extensions.yaml @@ -590,6 +590,12 @@ properties: in version 1.0 of RISC-V Cryptography Extensions Volume I specification. + - const: zic64b + description: + The standard Zic64b extension for 64-byte naturally aligned cache + blocks, as ratified in RISC-V Profiles Version 1.0, with commit + b1d806605f87 ("Updated to ratified state.") + - const: zicbom description: The standard Zicbom extension for base cache management operations as @@ -1142,6 +1148,20 @@ allOf: not: contains: const: zilsd + # Zic64b mandates 64-byte naturally aligned cache blocks + - if: + properties: + riscv,isa-extensions: + contains: + const: zic64b + then: + properties: + riscv,cbom-block-size: + const: 64 + riscv,cbop-block-size: + const: 64 + riscv,cboz-block-size: + const: 64 additionalProperties: true ... -- 2.43.0
