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Subject: Re: [v7,07/10] dt-bindings: counter: Document stm32 quadrature
 encoder
To:     William Breathitt Gray <vilhelm.gray@gmail.com>,
        gregkh@linuxfoundation.org
Cc:     jic23@kernel.org, linux-arm-kernel@lists.infradead.org,
        devicetree@vger.kernel.org, linux-kernel@vger.kernel.org,
        linux-iio@vger.kernel.org, fabrice.gasnier@st.com,
        benjamin.gaignard@st.com, robh+dt@kernel.org, knaack.h@gmx.de,
        lars@metafoo.de, pmeerw@pmeerw.net, mark.rutland@arm.com
References: <c1cc3d567d0a5799c3afe6e24ca9ec3b1547224e.1529607879.git.vilhelm.gray@gmail.com>
From:   David Lechner <david@lechnology.com>
Message-ID: <cf8231e3-0255-a4da-145c-69ccfe7288b2@lechnology.com>
Date:   Mon, 2 Jul 2018 14:56:26 -0500
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On 06/21/2018 04:08 PM, William Breathitt Gray wrote:
> From: Benjamin Gaignard <benjamin.gaignard@st.com>
> 
> Add bindings for STM32 Timer quadrature encoder.
> It is a sub-node of STM32 Timer which implement the
> quadratic encoder part of the hardware.

quadradic? or quadrature?

> 
> Cc: Rob Herring <robh+dt@kernel.org>
> Cc: Mark Rutland <mark.rutland@arm.com>
> Signed-off-by: Benjamin Gaignard <benjamin.gaignard@st.com>
> Signed-off-by: William Breathitt Gray <vilhelm.gray@gmail.com>
> ---
>   .../bindings/counter/stm32-timer-cnt.txt      | 31 +++++++++++++++++++
>   .../devicetree/bindings/mfd/stm32-timers.txt  |  7 +++++
>   2 files changed, 38 insertions(+)
>   create mode 100644 Documentation/devicetree/bindings/counter/stm32-timer-cnt.txt
> 
> diff --git a/Documentation/devicetree/bindings/counter/stm32-timer-cnt.txt b/Documentation/devicetree/bindings/counter/stm32-timer-cnt.txt
> new file mode 100644
> index 000000000000..c52fcdd4bf6c
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/counter/stm32-timer-cnt.txt
> @@ -0,0 +1,31 @@
> +STMicroelectronics STM32 Timer quadrature encoder
> +
> +STM32 Timer provides quadrature encoder to detect
> +angular position and direction of rotary elements,
> +from IN1 and IN2 input signals.
> +
> +Must be a sub-node of an STM32 Timer device tree node.
> +See ../mfd/stm32-timers.txt for details about the parent node.
> +
> +Required properties:
> +- compatible:		Must be "st,stm32-timer-counter".
> +- pinctrl-names: 	Set to "default".
> +- pinctrl-0: 		List of phandles pointing to pin configuration nodes,
> +			to set CH1/CH2 pins in mode of operation for STM32
> +			Timer input on external pin.
> +
> +Example:
> +	timers@40010000 {
> +		#address-cells = <1>;
> +		#size-cells = <0>;
> +		compatible = "st,stm32-timers";
> +		reg = <0x40010000 0x400>;
> +		clocks = <&rcc 0 160>;
> +		clock-names = "int";
> +
> +		counter {
> +			compatible = "st,stm32-timer-counter";
> +			pinctrl-names = "default";
> +			pinctrl-0 = <&tim1_in_pins>;
> +		};
> +	};
> diff --git a/Documentation/devicetree/bindings/mfd/stm32-timers.txt b/Documentation/devicetree/bindings/mfd/stm32-timers.txt
> index 1db6e0057a63..ff9c14ada30b 100644
> --- a/Documentation/devicetree/bindings/mfd/stm32-timers.txt
> +++ b/Documentation/devicetree/bindings/mfd/stm32-timers.txt
> @@ -23,6 +23,7 @@ Optional parameters:
>   Optional subnodes:
>   - pwm:			See ../pwm/pwm-stm32.txt
>   - timer:		See ../iio/timer/stm32-timer-trigger.txt
> +- counter:		See ../counter/stm32-timer-cnt.txt
>   
>   Example:
>   	timers@40010000 {
> @@ -43,4 +44,10 @@ Example:
>   			compatible = "st,stm32-timer-trigger";
>   			reg = <0>;
>   		};
> +
> +		counter {
> +			compatible = "st,stm32-timer-counter";
> +			pinctrl-names = "default";
> +			pinctrl-0 = <&tim1_in_pins>;
> +		};
>   	};
>