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-rw-r--r--Documentation/devicetree/bindings/riscv/cpus.yaml4
1 files changed, 4 insertions, 0 deletions
diff --git a/Documentation/devicetree/bindings/riscv/cpus.yaml b/Documentation/devicetree/bindings/riscv/cpus.yaml
index c899111aa5e3..9d3fe6aada2b 100644
--- a/Documentation/devicetree/bindings/riscv/cpus.yaml
+++ b/Documentation/devicetree/bindings/riscv/cpus.yaml
@@ -50,6 +50,10 @@ properties:
User-Level ISA document, available from
https://riscv.org/specifications/
+ While the isa strings in ISA specification are case
+ insensitive, letters in the riscv,isa string must be all
+ lowercase to simplify parsing.
+
timebase-frequency:
type: integer
minimum: 1