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hwmon: (max6650) Add initial rpm target devicetree documentation

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Add devicetree property for early initialization of the fan controller
to prevent overheating, for example when resetting the board while the
fan was completely turned off.

Signed-off-by: Mike Looijmans <mike.looijmans@topic.nl>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
This commit is contained in:
Mike Looijmans 2016-08-24 10:13:27 +02:00 committed by Guenter Roeck
parent 20005cc58d
commit f9f8b33d37
1 changed files with 5 additions and 0 deletions
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5
Documentation/devicetree/bindings/hwmon/max6650.txt
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@ -13,6 +13,10 @@ Optional properties, default is to retain the chip's current setting:
- maxim,fan-prescale : Pre-scaling value, as per datasheet [1]. Lower values
allow more fine-grained control of slower fans.
Valid: 1, 2, 4, 8, 16.
- maxim,fan-target-rpm: Initial requested fan rotation speed. If specified, the
driver selects closed-loop mode and the requested speed.
This ensures the fan is already running before userspace
takes over.
Example:
fan-max6650: max6650@1b {
@ -20,4 +24,5 @@ Example:
compatible = "maxim,max6650";
maxim,fan-microvolt = <12000000>;
maxim,fan-prescale = <4>;
maxim,fan-target-rpm = <1200>;
};