linux-kernel - [PATCH 2/2] dt-bindings: mali-bifrost: Add dynamic-power-coefficient

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Message-Id: <20201209115143.15321-3-lukasz.luba@arm.com>
Date:   Wed,  9 Dec 2020 11:51:43 +0000
From:   Lukasz Luba <lukasz.luba@....com>
To:     linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
        dri-devel@...ts.freedesktop.org
Cc:     lukasz.luba@....com, robh@...nel.org, airlied@...ux.ie,
        daniel@...ll.ch
Subject: [PATCH 2/2] dt-bindings: mali-bifrost: Add dynamic-power-coefficient

Add a property dynamic-power-coefficient which allows to register Energy
Model for the Mali Bifrost devices.

Signed-off-by: Lukasz Luba <lukasz.luba@....com>
---
 .../bindings/gpu/arm,mali-bifrost.yaml          | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/Documentation/devicetree/bindings/gpu/arm,mali-bifrost.yaml b/Documentation/devicetree/bindings/gpu/arm,mali-bifrost.yaml
index b1844b9c295d..184492162e7e 100644
--- a/Documentation/devicetree/bindings/gpu/arm,mali-bifrost.yaml
+++ b/Documentation/devicetree/bindings/gpu/arm,mali-bifrost.yaml
@@ -52,6 +52,23 @@ properties:
   "#cooling-cells":
     const: 2
 
+  dynamic-power-coefficient:
+    $ref: '/schemas/types.yaml#/definitions/uint32'
+    description:
+      A u32 value that represents the running time dynamic
+      power coefficient in units of uW/MHz/V^2. The
+      coefficient can either be calculated from power
+      measurements or derived by analysis.
+
+      The dynamic power consumption of the GPU is
+      proportional to the square of the Voltage (V) and
+      the clock frequency (f). The coefficient is used to
+      calculate the dynamic power as below -
+
+      Pdyn = dynamic-power-coefficient * V^2 * f
+
+      where voltage is in V, frequency is in MHz.
+
 required:
   - compatible
   - reg
-- 
2.17.1