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Date:   Mon, 16 Apr 2018 13:19:40 -0500
From:   Rob Herring <robh@...nel.org>
To:     Amelie Delaunay <amelie.delaunay@...com>
Cc:     Linus Walleij <linus.walleij@...aro.org>,
        Mark Rutland <mark.rutland@....com>,
        Russell King <linux@...linux.org.uk>,
        Alexandre Torgue <alexandre.torgue@...com>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        linux-gpio@...r.kernel.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        Lee Jones <lee.jones@...aro.org>
Subject: Re: [PATCH 1/5] dt-bindings: pinctrl: document the STMFX pinctrl
 bindings

On Wed, Apr 11, 2018 at 11:47:01AM +0200, Amelie Delaunay wrote:
> This patch adds documentation of device tree bindings for the
> STMicroelectronics Multi-Function eXpander (STMFX) GPIO expander.
> 
> Signed-off-by: Amelie Delaunay <amelie.delaunay@...com>
> ---
>  .../devicetree/bindings/pinctrl/pinctrl-stmfx.txt  | 118 +++++++++++++++++++++
>  1 file changed, 118 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/pinctrl/pinctrl-stmfx.txt
> 
> diff --git a/Documentation/devicetree/bindings/pinctrl/pinctrl-stmfx.txt b/Documentation/devicetree/bindings/pinctrl/pinctrl-stmfx.txt
> new file mode 100644
> index 0000000..4d8941de
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/pinctrl/pinctrl-stmfx.txt
> @@ -0,0 +1,118 @@
> +STMicroelectronics Multi-Function eXpander (STMFX) GPIO expander bindings
> +
> +ST Multi-Function eXpander (STMFX) is a slave controller using I2C for
> +communication with the main MCU. It offers up to 24 GPIOs expansion.
> +
> +Required properties:
> +- compatible: should be "st,stmfx-0300".
> +- reg: I2C slave address of the device.
> +- interrupt-parent: phandle of the STMFX parent interrupt controller.
> +- interrutps: interrupt specifier triggered by MFX_IRQ_OUT signal.
> +
> +Optional property:

s/property/properties/

> +- drive-open-drain: configure MFX_IRQ_OUT as open drain.
> +- vdd-supply: phandle of the regulator supplying STMFX.
> +
> +Required properties for gpio controller sub-node:
> +- #gpio-cells: should be <2>, the first cell is the GPIO number and the second
> +  cell is the gpio flags in accordance with <dt-bindings/gpio/gpio.h>.
> +- gpio-controller: marks the device as a GPIO controller.
> +Please refer to ../gpio/gpio.txt.
> +
> +Optional properties for gpio controller sub-node:
> +- #interrupt-cells: should be <2>, the first cell is the GPIO number and the
> +  second cell is the interrupt flags in accordance with
> +  <dt-bindings/interrupt-controller/irq.h>.
> +- interrupt-controller: marks the device as an interrupt controller.
> +
> +Please refer to pinctrl-bindings.txt for pin configuration.
> +
> +Required properties for pin configuration sub-nodes:
> +- pins: list of pins to which the configuration applies.
> +
> +Optional properties for pin configuration sub-nodes (pinconf-generic ones):
> +- bias-disable: disable any bias on the pin.
> +- bias-pull-up: the pin will be pulled up.
> +- bias-pull-pin-default: use the pin-default pull state.
> +- bias-pull-down: the pin will be pulled down.
> +- drive-open-drain: the pin will be driven with open drain.
> +- drive-push-pull: the pin will be driven actively high and low.
> +- output-high: the pin will be configured as an output driving high level.
> +- output-low: the pin will be configured as an output driving low level.
> +
> +Note that STMFX pins[15:0] are called "gpio[15:0]", and STMFX pins[23:16] are
> +called "agpio[7:0]". Example, to refer to pin 18 of STMFX, use "agpio2".
> +
> +Example:
> +
> +	stmfxpinctrl: stmfx@42 {
> +		compatible = "st,stmfx-0300";
> +		reg = <0x42>;
> +		interrupt-parent = <&gpioi>;
> +		interrupts = <8 IRQ_TYPE_EDGE_RISING>;
> +		vdd-supply = <&v3v3>;
> +		status = "okay";

Don't show status in examples.

> +
> +		stmfxgpio: gpio {

Why does this need to be a sub node? Are there functions beyond GPIO?

> +			#gpio-cells = <2>;
> +			#interrupt-cells = <2>;
> +			gpio-controller;
> +			interrupt-controller;
> +			status = "okay";
> +		};
> +
> +		joystick_pins: joystick@0 {

A unit-address without a reg prop is not valid.

> +			pins = "gpio0", "gpio1", "gpio2", "gpio3", "gpio4";
> +			drive-push-pull;
> +			bias-pull-down;
> +		};
> +	};
> +
> +	joystick {
> +		compatible = "gpio-keys";
> +		#address-cells = <1>;
> +		#size-cells = <0>;
> +		pinctrl-0 = <&joystick_pins>;
> +		pinctrl-names = "default";
> +		button@0 {
> +			label = "JoySel";
> +			linux,code = <KEY_ENTER>;
> +			interrupt-parent = <&stmfxgpio>;
> +			interrupts = <0 IRQ_TYPE_EDGE_RISING>;
> +		};
> +		button@1 {
> +			label = "JoyDown";
> +			linux,code = <KEY_DOWN>;
> +			interrupt-parent = <&stmfxgpio>;
> +			interrupts = <1 IRQ_TYPE_EDGE_RISING>;
> +		};
> +		button@2 {
> +			label = "JoyLeft";
> +			linux,code = <KEY_LEFT>;
> +			interrupt-parent = <&stmfxgpio>;
> +			interrupts = <2 IRQ_TYPE_EDGE_RISING>;
> +		};
> +		button@3 {
> +			label = "JoyRight";
> +			linux,code = <KEY_RIGHT>;
> +			interrupt-parent = <&stmfxgpio>;
> +			interrupts = <3 IRQ_TYPE_EDGE_RISING>;
> +		};
> +		button@4 {
> +			label = "JoyUp";
> +			linux,code = <KEY_UP>;
> +			interrupt-parent = <&stmfxgpio>;
> +			interrupts = <4 IRQ_TYPE_EDGE_RISING>;
> +		};
> +	};
> +
> +	leds {
> +		compatible = "gpio-leds";
> +		orange {
> +			gpios = <&stmfxgpio 17 1>;
> +		};
> +
> +		blue {
> +			gpios = <&stmfxgpio 19 1>;
> +		};
> +	}
> -- 
> 2.7.4
> 

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