* I2C controller embedded in STMicroelectronics STM32 I2C platform Required properties: - 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. - 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. For STM32F4 SoC Standard-mode and Fast-mode are supported, possible values are 100000 and 400000. For STM32F7, STM32H7 and STM32MP1 SoCs, Standard-mode, Fast-mode and Fast-mode Plus are supported, possible values are 100000, 400000 and 1000000. - dmas: List of phandles to rx and tx DMA channels. Refer to stm32-dma.txt. - dma-names: List of dma names. Valid names are: "rx" and "tx". - i2c-scl-rising-time-ns: I2C SCL Rising time for the board (default: 25) For STM32F7, STM32H7 and STM32MP1 only. - i2c-scl-falling-time-ns: I2C SCL Falling time for the board (default: 10) For STM32F7, STM32H7 and STM32MP1 only. I2C Timings are derived from these 2 values - st,syscfg-fmp: Use to set Fast Mode Plus bit within SYSCFG when Fast Mode Plus speed is selected by slave. 1st cell: phandle to syscfg 2nd cell: register offset within SYSCFG 3rd cell: register bitmask for FMP bit For STM32F7, STM32H7 and STM32MP1 only. 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"; }; 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"; st,syscfg-fmp = <&syscfg 0x4 0x1>; };