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dt-bindings: iio: Add STM32 LPTimer quadrature encoder and counter

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Add documentation for STMicroelectronics STM32 Low-Power Timer
quadrature encoder and counter binding.

Signed-off-by: Fabrice Gasnier <fabrice.gasnier@st.com>
Acked-by: Jonathan Cameron <jic23@kernel.org>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
This commit is contained in:
Fabrice Gasnier 2017-08-28 12:04:12 +02:00 committed by Lee Jones
parent b01ced2b50
commit 717e6922de
1 changed files with 27 additions and 0 deletions
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Documentation/devicetree/bindings/iio/counter/stm32-lptimer-cnt.txt Normal file
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STMicroelectronics STM32 Low-Power Timer quadrature encoder and counter
STM32 Low-Power Timer provides several counter modes. It can be used as:
- quadrature encoder to detect angular position and direction of rotary
elements, from IN1 and IN2 input signals.
- simple counter from IN1 input signal.
Must be a sub-node of an STM32 Low-Power Timer device tree node.
See ../mfd/stm32-lptimer.txt for details about the parent node.
Required properties:
- compatible: Must be "st,stm32-lptimer-counter".
- pinctrl-names: Set to "default".
- pinctrl-0: List of phandles pointing to pin configuration nodes,
to set IN1/IN2 pins in mode of operation for Low-Power
Timer input on external pin.
Example:
timer@40002400 {
compatible = "st,stm32-lptimer";
...
counter {
compatible = "st,stm32-lptimer-counter";
pinctrl-names = "default";
pinctrl-0 = <&lptim1_in_pins>;
};
};