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Commit edcd2ae8 authored by Pierre-Yves MORDRET's avatar Pierre-Yves MORDRET Committed by Wolfram Sang
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dt-bindings: i2c-stm32: Document the STM32F7 I2C bindings 



This patch adds the documentation of device tree bindings for STM32F7 I2C

Signed-off-by: default avatarM'boumba Cedric Madianga <cedric.madianga@gmail.com>
Signed-off-by: default avatarPierre-Yves MORDRET <pierre-yves.mordret@st.com>
Acked-by: default avatarRob Herring <robh@kernel.org>
Signed-off-by: default avatarWolfram Sang <wsa@the-dreams.de>
parent 0560ad57

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

+26 −3
Original line number Diff line number Diff line 
* I2C controller embedded in STMicroelectronics STM32 I2C platform



Required properties :

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

- compatible : Must be one of the following

  - "st,stm32f4-i2c"

  - "st,stm32f7-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.
@@ -14,8 +16,16 @@ Required properties : 


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.

  the default 100 kHz frequency will be used.

  For STM32F4 SoC Standard-mode and Fast-mode are supported, possible values are

  100000 and 400000.

  For STM32F7 SoC, Standard-mode, Fast-mode and Fast-mode Plus are supported,

  possible values are 100000, 400000 and 1000000.

- i2c-scl-rising-time-ns : Only for STM32F7, I2C SCL Rising time for the board

  (default: 25)

- i2c-scl-falling-time-ns : Only for STM32F7, I2C SCL Falling time for the board

  (default: 10)

  I2C Timings are derived from these 2 values



Example :
@@ -31,3 +41,16 @@ Example : 
		pinctrl-0 = <&i2c1_sda_pin>, <&i2c1_scl_pin>;

		pinctrl-names = "default";

	};



	i2c@40005400 {

		compatible = "st,stm32f7-i2c";

		#address-cells = <1>;

		#size-cells = <0>;

		reg = <0x40005400 0x400>;

		interrupts = <31>,

			     <32>;

		resets = <&rcc STM32F7_APB1_RESET(I2C1)>;

		clocks = <&rcc 1 CLK_I2C1>;

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

		pinctrl-names = "default";

	};