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a462d2b757
* target: add phytium support * kernel/video: add phytium platform ARM GPU support * config: add EFI support to phytium armv8 * target: phytium: remove rtl8821cs driver * target: phytium: refresh dts
49 lines
1.4 KiB
Plaintext
Executable File
49 lines
1.4 KiB
Plaintext
Executable File
Phytium Fan Tacho and capture counter controller device driver
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The controller can support one input signal. The function of controller is to
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measure the speed of fan and the edge number of input signal. The function
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can be selected by devicetree setting. The edging mode and anti-jitter level
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can also setted in devicetree.
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Required properties for tacho node:
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- #address-cells : should be 1.
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- #size-cells : should be 1.
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- reg : address and length of the register set for the device.
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- compatible : should be "phytium,tacho"
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- clocks : phandle to clock provider with the clock number in the second cell
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Optional properties for tacho node:
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- tacho : set the controller work as fan tachometer, which is a default option.
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- capture : set the controller work as capture counter.
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-------------------------------------------------------------------------------
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- up : set the input edging mode as ascending, which is a default option.
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- down : set the input edging mode as descending.
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- double : set the input edging mode as doule-edging.
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-------------------------------------------------------------------------------
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- debounce-level : set the debounce-levle, which can be 0, 1, 2 and 3.
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Examples:
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tacho: tacho@28054000 {
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#address-cells = <1>;
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#size-cells = <1>;
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reg = <0x0 0x28054000 0x0 0x1000>;
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compatible = "phytium,tacho";
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clocks = <&sysclk>;
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tacho;
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up;
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debounce-level = <2>;
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};
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