66 lines
2.3 KiB
Plaintext
66 lines
2.3 KiB
Plaintext
* 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>;
|
|
};
|