linux-kernel - [PATCH v5] dt-bindings: gpu: mali-utgard: Add the #cooling-cells property

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Message-Id: <20200411165700.1576314-1-martin.blumenstingl@googlemail.com>
Date:   Sat, 11 Apr 2020 18:57:00 +0200
From:   Martin Blumenstingl <martin.blumenstingl@...glemail.com>
To:     robh+dt@...nel.org, dri-devel@...ts.freedesktop.org,
        devicetree@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org,
        linux-amlogic@...ts.infradead.org,
        Martin Blumenstingl <martin.blumenstingl@...glemail.com>,
        Qiang Yu <yuq825@...il.com>
Subject: [PATCH v5] dt-bindings: gpu: mali-utgard: Add the #cooling-cells property

The GPU can be one of the big heat sources on a SoC. Allow the
"#cooling-cells" property to be specified for ARM Mali Utgard GPUs so
the GPU clock speeds (and voltages) can be reduced to prevent a SoC from
overheating.

Reviewed-by: Qiang Yu <yuq825@...il.com>
Signed-off-by: Martin Blumenstingl <martin.blumenstingl@...glemail.com>
---
Changes since v4 at [0]:
- Added Qiang's Reviewed-by (many thanks)
- re-send because I missed the devicetree mailing list in v4


[0] https://patchwork.kernel.org/patch/11448013/


 Documentation/devicetree/bindings/gpu/arm,mali-utgard.yaml | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/Documentation/devicetree/bindings/gpu/arm,mali-utgard.yaml b/Documentation/devicetree/bindings/gpu/arm,mali-utgard.yaml
index f5401cc8de4a..4869258daadb 100644
--- a/Documentation/devicetree/bindings/gpu/arm,mali-utgard.yaml
+++ b/Documentation/devicetree/bindings/gpu/arm,mali-utgard.yaml
@@ -107,6 +107,9 @@ properties:
 
   operating-points-v2: true
 
+  "#cooling-cells":
+    const: 2
+
 required:
   - compatible
   - reg
@@ -164,6 +167,7 @@ examples:
       clocks = <&ccu 1>, <&ccu 2>;
       clock-names = "bus", "core";
       resets = <&ccu 1>;
+      #cooling-cells = <2>;
     };
 
 ...
-- 
2.26.0