linux-kernel - [PATCH 5.18 0062/1095] dt-bindings: riscv: fix SiFive l2-caches cache-sets

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Message-Id: <20220815180432.066936189@linuxfoundation.org>
Date:   Mon, 15 Aug 2022 19:51:01 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Atul Khare <atulkhare@...osinc.com>,
        Conor Dooley <conor.dooley@...rochip.com>,
        Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        Palmer Dabbelt <palmer@...osinc.com>
Subject: [PATCH 5.18 0062/1095] dt-bindings: riscv: fix SiFive l2-caches cache-sets

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

commit b60cf8e59e61133b6c9514ff8d8c8d7049d040ef upstream.

Fix device tree schema validation error messages for the SiFive
Unmatched: ' cache-sets:0:0: 1024 was expected'.

The existing bindings allow for just 1024 cache-sets but the fu740 on
Unmatched the has 2048 cache-sets. The ISA itself permits any arbitrary
power of two, however this is not supported by dt-schema. The RTL for
the IP, to which the number of cache-sets is a tunable parameter, has
been released publicly so speculatively adding a small number of
"reasonable" values seems unwise also.

Instead, as the binding only supports two distinct controllers: add 2048
and explicitly lock it to the fu740's l2 cache while limiting 1024 to
the l2 cache on the fu540.

Fixes: af951c3a113b ("dt-bindings: riscv: Update l2 cache DT documentation to add support for SiFive FU740")
Reported-by: Atul Khare <atulkhare@...osinc.com>
Signed-off-by: Conor Dooley <conor.dooley@...rochip.com>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Cc: stable@...r.kernel.org
Link: https://lore.kernel.org/r/20220803185359.942928-1-mail@conchuod.ie
Signed-off-by: Palmer Dabbelt <palmer@...osinc.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 Documentation/devicetree/bindings/riscv/sifive-l2-cache.yaml |    6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

--- a/Documentation/devicetree/bindings/riscv/sifive-l2-cache.yaml
+++ b/Documentation/devicetree/bindings/riscv/sifive-l2-cache.yaml
@@ -46,7 +46,7 @@ properties:
     const: 2
 
   cache-sets:
-    const: 1024
+    enum: [1024, 2048]
 
   cache-size:
     const: 2097152
@@ -84,6 +84,8 @@ then:
       description: |
         Must contain entries for DirError, DataError and DataFail signals.
       maxItems: 3
+    cache-sets:
+      const: 1024
 
 else:
   properties:
@@ -91,6 +93,8 @@ else:
       description: |
         Must contain entries for DirError, DataError, DataFail, DirFail signals.
       minItems: 4
+    cache-sets:
+      const: 2048
 
 additionalProperties: false