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diff --git a/zephyr/dts/bindings/fan/cros-ec,fan-steps.yaml b/zephyr/dts/bindings/fan/cros-ec,fan-steps.yaml
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+# Copyright 2022 The ChromiumOS Authors
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+description: Fan steps parent node
+compatible: "cros-ec,fan-steps"
+child-binding:
+ description: Support multiple thermal sensor temperature to trigger different fans speed,
+ each step could have different rpm for each fan
+ properties:
+ temp_on:
+ required: false
+ type: array
+ description:
+ Temperatures for each sensor to trigger next fan level,
+ <sensor 0, sensor 1, sensor 2, ...> mapping to variant overlay
+ temp_off:
+ required: false
+ type: array
+ description:
+ Temperatures for each sensor to trigger previous fan level,
+ <sensor 0, sensor 1, sensor 2, ...> mapping to variant overlay
+ rpm_target:
+ required: false
+ type: array
+ description:
+ Support multiple fan speed target for each level (in RPM),
+ <fan0 rpm target, fan1 rpm target, ...>