2013-06-21 04:21:04 +08:00
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GMT G762/G763 PWM Fan controller
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Required node properties:
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- "compatible": must be either "gmt,g762" or "gmt,g763"
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- "reg": I2C bus address of the device
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- "clocks": a fixed clock providing input clock frequency
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on CLK pin of the chip.
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Optional properties:
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- "fan_startv": fan startup voltage. Accepted values are 0, 1, 2 and 3.
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The higher the more.
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- "pwm_polarity": pwm polarity. Accepted values are 0 (positive duty)
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and 1 (negative duty).
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- "fan_gear_mode": fan gear mode. Supported values are 0, 1 and 2.
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If an optional property is not set in .dts file, then current value is kept
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unmodified (e.g. u-boot installed value).
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Additional information on operational parameters for the device is available
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2019-04-17 17:46:29 +08:00
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in Documentation/hwmon/g762.rst. A detailed datasheet for the device is available
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2013-06-21 04:21:04 +08:00
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at http://natisbad.org/NAS/refs/GMT_EDS-762_763-080710-0.2.pdf.
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Example g762 node:
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clocks {
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#address-cells = <1>;
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#size-cells = <0>;
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g762_clk: fixedclk {
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compatible = "fixed-clock";
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#clock-cells = <0>;
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clock-frequency = <8192>;
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}
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}
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g762: g762@3e {
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compatible = "gmt,g762";
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reg = <0x3e>;
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clocks = <&g762_clk>
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fan_gear_mode = <0>; /* chip default */
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fan_startv = <1>; /* chip default */
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pwm_polarity = <0>; /* chip default */
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};
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