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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>
29 lines
991 B
Plaintext
29 lines
991 B
Plaintext
Bindings for MAX6651 and MAX6650 I2C fan controllers
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Reference:
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[1] https://datasheets.maximintegrated.com/en/ds/MAX6650-MAX6651.pdf
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Required properties:
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- compatible : One of "maxim,max6650" or "maxim,max6651"
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- reg : I2C address, one of 0x1b, 0x1f, 0x4b, 0x48.
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Optional properties, default is to retain the chip's current setting:
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- maxim,fan-microvolt : The supply voltage of the fan, either 5000000 uV or
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12000000 uV.
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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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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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fan-max6650: max6650@1b {
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reg = <0x1b>;
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compatible = "maxim,max6650";
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maxim,fan-microvolt = <12000000>;
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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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