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In order to support capture of PWM signals a new clock as well as an interrupt line are required. Furthermore a new property is introduced that allows the number of capture channels to be specified. Typically there will be less capture channels than output channels, since all channels have the latter capability, but only some have support for capture. Signed-off-by: Lee Jones <lee.jones@linaro.org> Acked-by: Rob Herring <robh@kernel.org> Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
44 lines
1.4 KiB
Plaintext
44 lines
1.4 KiB
Plaintext
STMicroelectronics PWM driver bindings
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Required parameters:
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- compatible : "st,pwm"
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- #pwm-cells : Number of cells used to specify a PWM. First cell
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specifies the per-chip index of the PWM to use and the
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second cell is the period in nanoseconds - fixed to 2
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for STiH41x.
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- reg : Physical base address and length of the controller's
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registers.
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- pinctrl-names: Set to "default".
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- pinctrl-0: List of phandles pointing to pin configuration nodes
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for PWM module.
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For Pinctrl properties, please refer to [1].
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- clock-names: Valid entries are "pwm" and/or "capture".
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- clocks: phandle of the clock used by the PWM module.
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For Clk properties, please refer to [2].
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- interrupts: IRQ for the Capture device
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Optional properties:
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- st,pwm-num-chan: Number of available PWM channels. Default is 0.
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- st,capture-num-chan: Number of available Capture channels. Default is 0.
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[1] Documentation/devicetree/bindings/pinctrl/pinctrl-bindings.txt
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[2] Documentation/devicetree/bindings/clock/clock-bindings.txt
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Example:
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pwm1: pwm@fe510000 {
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compatible = "st,pwm";
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reg = <0xfe510000 0x68>;
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#pwm-cells = <2>;
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pinctrl-names = "default";
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pinctrl-0 = <&pinctrl_pwm1_chan0_default
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&pinctrl_pwm1_chan1_default
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&pinctrl_pwm1_chan2_default
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&pinctrl_pwm1_chan3_default>;
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clocks = <&clk_sysin>;
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clock-names = "pwm";
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st,pwm-num-chan = <4>;
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st,capture-num-chan = <2>;
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};
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