forked from Minki/linux
hwmon: (max6650) Add initial rpm target devicetree documentation
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>
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@ -13,6 +13,10 @@ Optional properties, default is to retain the chip's current setting:
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- maxim,fan-prescale : Pre-scaling value, as per datasheet [1]. Lower values
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- maxim,fan-prescale : Pre-scaling value, as per datasheet [1]. Lower values
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allow more fine-grained control of slower fans.
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allow more fine-grained control of slower fans.
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Valid: 1, 2, 4, 8, 16.
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Valid: 1, 2, 4, 8, 16.
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- maxim,fan-target-rpm: Initial requested fan rotation speed. If specified, the
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driver selects closed-loop mode and the requested speed.
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This ensures the fan is already running before userspace
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takes over.
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Example:
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Example:
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fan-max6650: max6650@1b {
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fan-max6650: max6650@1b {
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@ -20,4 +24,5 @@ Example:
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compatible = "maxim,max6650";
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compatible = "maxim,max6650";
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maxim,fan-microvolt = <12000000>;
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maxim,fan-microvolt = <12000000>;
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maxim,fan-prescale = <4>;
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maxim,fan-prescale = <4>;
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maxim,fan-target-rpm = <1200>;
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};
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};
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