Bindings for MAX6651 and MAX6650 I2C fan controllers Reference: [1] https://datasheets.maximintegrated.com/en/ds/MAX6650-MAX6651.pdf Required properties: - compatible : One of "maxim,max6650" or "maxim,max6651" - reg : I2C address, one of 0x1b, 0x1f, 0x4b, 0x48. Optional properties, default is to retain the chip's current setting: - maxim,fan-microvolt : The supply voltage of the fan, either 5000000 uV or 12000000 uV. - 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 { reg = <0x1b>; compatible = "maxim,max6650"; maxim,fan-microvolt = <12000000>; maxim,fan-prescale = <4>; maxim,fan-target-rpm = <1200>; };