linux-kernel - [PATCH v3 2/5] dt-bindings: mips: mips-cm: Add a new compatible string for EyeQ6

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Message-Id: <20250123-cluster-hci-broken-v3-2-8a7ec57cbf68@bootlin.com>
Date: Thu, 23 Jan 2025 12:01:55 +0100
From: Gregory CLEMENT <gregory.clement@...tlin.com>
To: Aleksandar Rikalo <arikalo@...il.com>, 
 Thomas Bogendoerfer <tsbogend@...ha.franken.de>, 
 Jiaxun Yang <jiaxun.yang@...goat.com>, Rob Herring <robh@...nel.org>, 
 Krzysztof Kozlowski <krzk+dt@...nel.org>, 
 Conor Dooley <conor+dt@...nel.org>
Cc: Vladimir Kondratiev <vladimir.kondratiev@...ileye.com>, 
 Théo Lebrun <theo.lebrun@...tlin.com>, 
 Tawfik Bayouk <tawfik.bayouk@...ileye.com>, 
 Thomas Petazzoni <thomas.petazzoni@...tlin.com>, linux-mips@...r.kernel.org, 
 devicetree@...r.kernel.org, linux-kernel@...r.kernel.org, 
 Gregory CLEMENT <gregory.clement@...tlin.com>
Subject: [PATCH v3 2/5] dt-bindings: mips: mips-cm: Add a new compatible
 string for EyeQ6

The CM3.5 used on EyeQ6 reports that Hardware Cache Initialization is
complete, but in reality it's not the case. It also incorrectly
indicates that Hardware Cache Initialization is supported. This new
compatible string allows warning about this broken feature that cannot
be detected at runtime.

Signed-off-by: Gregory CLEMENT <gregory.clement@...tlin.com>
---
 Documentation/devicetree/bindings/mips/mti,mips-cm.yaml | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/Documentation/devicetree/bindings/mips/mti,mips-cm.yaml b/Documentation/devicetree/bindings/mips/mti,mips-cm.yaml
index 4324b2306535f1bf66c44b1f96be9094ee282041..d129d6382847768dc026336d8d2c7328b6b81f9b 100644
--- a/Documentation/devicetree/bindings/mips/mti,mips-cm.yaml
+++ b/Documentation/devicetree/bindings/mips/mti,mips-cm.yaml
@@ -19,7 +19,12 @@ maintainers:
 
 properties:
   compatible:
-    const: mti,mips-cm
+    oneOf:
+      - const: mti,mips-cm
+      - const: mobileye,eyeq6-cm
+        description:
+          On EyeQ6 the HCI (Hardware Cache Initialization) information for
+          the L2 cache in multi-cluster configuration is broken.
 
   reg:
     description:
@@ -44,4 +49,9 @@ examples:
       compatible = "mti,mips-cm";
       reg = <0x1bde8000 0x8000>;
     };
+
+  - |
+    coherency-manager {
+      compatible = "mobileye,eyeq6-cm";
+    };
 ...

-- 
2.45.2