linux-kernel - [PATCH 5/5] dt-bindings: memory: tegra210: Mark EMC as cooling device

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Date:   Fri, 17 Dec 2021 17:59:19 +0100
From:   Thierry Reding <thierry.reding@...il.com>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>,
        Rob Herring <robh+dt@...nel.org>
Cc:     Jon Hunter <jonathanh@...dia.com>, devicetree@...r.kernel.org,
        linux-tegra@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 5/5] dt-bindings: memory: tegra210: Mark EMC as cooling device

From: Thierry Reding <treding@...dia.com>

The external memory controller found on Tegra210 can use throttling of
the EMC frequency in order to reduce the memory chip temperature. Mark
the memory controller as a cooling device to take advantage of this
functionality.

Signed-off-by: Thierry Reding <treding@...dia.com>
---
 .../bindings/memory-controllers/nvidia,tegra210-emc.yaml  | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/Documentation/devicetree/bindings/memory-controllers/nvidia,tegra210-emc.yaml b/Documentation/devicetree/bindings/memory-controllers/nvidia,tegra210-emc.yaml
index bc8477e7ab19..95c14deb8941 100644
--- a/Documentation/devicetree/bindings/memory-controllers/nvidia,tegra210-emc.yaml
+++ b/Documentation/devicetree/bindings/memory-controllers/nvidia,tegra210-emc.yaml
@@ -44,6 +44,11 @@ properties:
     description:
       phandle of the memory controller node
 
+allOf:
+  - $ref: ../thermal/thermal-cooling-devices.yaml
+
+unevaluatedProperties: false
+
 required:
   - compatible
   - reg
@@ -51,8 +56,6 @@ required:
   - clock-names
   - nvidia,memory-controller
 
-additionalProperties: false
-
 examples:
   - |
     #include <dt-bindings/clock/tegra210-car.h>
@@ -79,4 +82,5 @@ examples:
         interrupts = <GIC_SPI 78 IRQ_TYPE_LEVEL_HIGH>;
         memory-region = <&emc_table>;
         nvidia,memory-controller = <&mc>;
+        #cooling-cells = <2>;
     };
-- 
2.34.1