linux-kernel - [PATCH] dt-bindings: riscv: fix SiFive l2-cache's cache-sets

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Date:   Wed,  3 Aug 2022 19:54:00 +0100
From:   Conor Dooley <mail@...chuod.ie>
To:     Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Palmer Dabbelt <palmer@...belt.com>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Conor Dooley <conor.dooley@...rochip.com>,
        Atul Khare <atulkhare@...osinc.com>,
        Sagar Kadam <sagar.kadam@...ive.com>
Cc:     linux-gpio@...r.kernel.org, devicetree@...r.kernel.org,
        linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: [PATCH] dt-bindings: riscv: fix SiFive l2-cache's cache-sets

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

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>
---
I split this off from the existing series as there is no dependancy
between this cache change and the gpio patch. The prior series can
be found at:
https://lore.kernel.org/all/20220726170725.3245278-2-mail@conchuod.ie/
---
 .../devicetree/bindings/riscv/sifive-l2-cache.yaml          | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/Documentation/devicetree/bindings/riscv/sifive-l2-cache.yaml b/Documentation/devicetree/bindings/riscv/sifive-l2-cache.yaml
index e2d330bd4608..69cdab18d629 100644
--- 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
 
-- 
2.37.1