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List:       linux-iio
Subject:    Re: [PATCH v2 3/7] PWM: add pwm-stm32 DT bindings
From:       Rob Herring <robh () kernel ! org>
Date:       2016-11-30 21:20:55
Message-ID: 20161130212055.b57qkqy66j5gg57q () rob-hp-laptop
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On Thu, Nov 24, 2016 at 04:14:19PM +0100, Benjamin Gaignard wrote:
> Define bindings for pwm-stm32
> 
> version 2:
> - use parameters instead of compatible of handle the hardware configuration
> 
> Signed-off-by: Benjamin Gaignard <benjamin.gaignard@st.com>
> ---
> .../devicetree/bindings/pwm/pwm-stm32.txt          | 37 ++++++++++++++++++++++
> 1 file changed, 37 insertions(+)
> create mode 100644 Documentation/devicetree/bindings/pwm/pwm-stm32.txt
> 
> diff --git a/Documentation/devicetree/bindings/pwm/pwm-stm32.txt \
> b/Documentation/devicetree/bindings/pwm/pwm-stm32.txt new file mode 100644
> index 0000000..36263f0
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/pwm/pwm-stm32.txt
> @@ -0,0 +1,37 @@
> +STMicroelectronics PWM driver bindings for STM32
> +
> +Must be a sub-node of STM32 general purpose timer driver
> +
> +Required parameters:
> +- compatible:		Must be "st,stm32-pwm"
> +- pinctrl-names: 	Set to "default".
> +- pinctrl-0: 		List of phandles pointing to pin configuration nodes
> +			for PWM module.
> +			For Pinctrl properties, please refer to [1].
> +
> +Optional parameters:
> +- st,breakinput:	Set if the hardware have break input capabilities
> +- st,breakinput-polarity: Set break input polarity. Default is 0
> +			 The value define the active polarity:
> +			  - 0 (active LOW)
> +			  - 1 (active HIGH)
> +- st,pwm-num-chan:	Number of available PWM channels.  Default is 0.
> +- st,32bits-counter:	Set if the hardware have a 32 bits counter
> +- st,complementary:	Set if the hardware have complementary output channels

What does complementary mean here?

> +
> +[1] Documentation/devicetree/bindings/pinctrl/pinctrl-bindings.txt
> +
> +Example:
> +	gptimer1: gptimer1@40010000 {

timer@...

> +		compatible = "st,stm32-gptimer";
> +		reg = <0x40010000 0x400>;
> +		clocks = <&rcc 0 160>;
> +		clock-names = "clk_int";
> +
> +		pwm1@0 {

pwm {

Is there more than one?

> +			compatible = "st,stm32-pwm";
> +			st,pwm-num-chan = <4>;
> +			st,breakinput;
> +			st,complementary;
> +		};
> +	};
> -- 
> 1.9.1
> 
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