tjh.dev
Linux kernel mirror (for testing)
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1* I2C controller embedded in STMicroelectronics STM32 I2C platform
2
3Required properties :
4- compatible : Must be one of the following
5 - "st,stm32f4-i2c"
6 - "st,stm32f7-i2c"
7- reg : Offset and length of the register set for the device
8- interrupts : Must contain the interrupt id for I2C event and then the
9 interrupt id for I2C error.
10- resets: Must contain the phandle to the reset controller.
11- clocks: Must contain the input clock of the I2C instance.
12- A pinctrl state named "default" must be defined to set pins in mode of
13 operation for I2C transfer
14- #address-cells = <1>;
15- #size-cells = <0>;
16
17Optional properties :
18- clock-frequency : Desired I2C bus clock frequency in Hz. If not specified,
19 the default 100 kHz frequency will be used.
20 For STM32F4 SoC Standard-mode and Fast-mode are supported, possible values are
21 100000 and 400000.
22 For STM32F7 SoC, Standard-mode, Fast-mode and Fast-mode Plus are supported,
23 possible values are 100000, 400000 and 1000000.
24- i2c-scl-rising-time-ns : Only for STM32F7, I2C SCL Rising time for the board
25 (default: 25)
26- i2c-scl-falling-time-ns : Only for STM32F7, I2C SCL Falling time for the board
27 (default: 10)
28 I2C Timings are derived from these 2 values
29
30Example :
31
32 i2c@40005400 {
33 compatible = "st,stm32f4-i2c";
34 #address-cells = <1>;
35 #size-cells = <0>;
36 reg = <0x40005400 0x400>;
37 interrupts = <31>,
38 <32>;
39 resets = <&rcc 277>;
40 clocks = <&rcc 0 149>;
41 pinctrl-0 = <&i2c1_sda_pin>, <&i2c1_scl_pin>;
42 pinctrl-names = "default";
43 };
44
45 i2c@40005400 {
46 compatible = "st,stm32f7-i2c";
47 #address-cells = <1>;
48 #size-cells = <0>;
49 reg = <0x40005400 0x400>;
50 interrupts = <31>,
51 <32>;
52 resets = <&rcc STM32F7_APB1_RESET(I2C1)>;
53 clocks = <&rcc 1 CLK_I2C1>;
54 pinctrl-0 = <&i2c1_sda_pin>, <&i2c1_scl_pin>;
55 pinctrl-names = "default";
56 };