[PATCH 3/3] dt-bindings: riscv: add new riscv, isa strings for emulators

[Conor Dooley]

From: Conor Dooley <conor.dooley@microchip.com>

The QEMU virt and spike machines currently export a riscv,isa string of
"rv64imafdcsuh", but this obviously has illegal extensions in it.
The presense of "su" is a QEMU bug, so add an entry for the valid
portion of the isa string.

Reported-by: Rob Herring <robh@kernel.org>
Link: 
https://lore.kernel.org/linux-riscv/20220803170552.GA2250266-robh@kernel.org/
Signed-off-by: Conor Dooley <conor.dooley@microchip.com>
---
Although the commit message says "a" string, I have added more than one
isa string. My patched version of QEMU emits the full string with the
multi letter extensions and I am not sure what the policy is for
including them in the binding. Obviously I am more than willing to
change the patch text if needed.
---
 Documentation/devicetree/bindings/riscv/cpus.yaml | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/Documentation/devicetree/bindings/riscv/cpus.yaml 
b/Documentation/devicetree/bindings/riscv/cpus.yaml
index d632ac76532e..59b942c5b9aa 100644
--- a/Documentation/devicetree/bindings/riscv/cpus.yaml
+++ b/Documentation/devicetree/bindings/riscv/cpus.yaml
@@ -77,6 +77,8 @@ properties:
     enum:
       - rv64imac
       - rv64imafdc
+      - rv64imafdch
+      - rv64imafdch_zicsr_zifencei_zba_zbb_zbc_zbs
 
   # RISC-V requires 'timebase-frequency' in /cpus, so disallow it here
   timebase-frequency: false
-- 
2.37.1