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Commit 33eb46e1 authored by M'boumba Cedric Madianga's avatar M'boumba Cedric Madianga Committed by Wolfram Sang
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dt-bindings: Document the STM32 I2C bindings 



This patch adds documentation of device tree bindings for the STM32 I2C
controller.

Signed-off-by: default avatarM'boumba Cedric Madianga <cedric.madianga@gmail.com>
Acked-by: default avatarRob Herring <robh@kernel.org>
Signed-off-by: default avatarWolfram Sang <wsa@the-dreams.de>
parent 7a308bb3

Documentation/devicetree/bindings/i2c/i2c-stm32.txt

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* I2C controller embedded in STMicroelectronics STM32 I2C platform



Required properties :

- compatible : Must be "st,stm32f4-i2c"

- reg : Offset and length of the register set for the device

- interrupts : Must contain the interrupt id for I2C event and then the

  interrupt id for I2C error.

- resets: Must contain the phandle to the reset controller.

- clocks: Must contain the input clock of the I2C instance.

- A pinctrl state named "default" must be defined to set pins in mode of

  operation for I2C transfer

- #address-cells = <1>;

- #size-cells = <0>;



Optional properties :

- clock-frequency : Desired I2C bus clock frequency in Hz. If not specified,

  the default 100 kHz frequency will be used. As only Normal and Fast modes

  are supported, possible values are 100000 and 400000.



Example :



	i2c@40005400 {

		compatible = "st,stm32f4-i2c";

		#address-cells = <1>;

		#size-cells = <0>;

		reg = <0x40005400 0x400>;

		interrupts = <31>,

			     <32>;

		resets = <&rcc 277>;

		clocks = <&rcc 0 149>;

		pinctrl-0 = <&i2c1_sda_pin>, <&i2c1_scl_pin>;

		pinctrl-names = "default";

	};