Olivier and others, I need 3 i2c buses to prototype on STM32MP157F-DK2. i2c5,i2c6 collide on PA12,PA11 for using UART4 for STLink. i2c4 collides for using USB-C power. I am using i2c2_pins_a on PD7,PG15. If I configure i2c2_pins_b on PF1,PF0 will it work if the addresses are unique? Sadly PH4,PH5 are not brought out on board to configure i2c2_pins_c. Then are these all sharing i2c2 400kHz? For our custom board, really want to have i2c5 on PD1,PD0 and i2c6 and i2c3 on PA8,PC9.
Yes, I have read the stm I2C resources. It has been hard to find out about the suffixes: _a, _b, _c.
So here are stm32mp15-pinctrl.dtsi entries for i2c2:
i2c2_pins_a: i2c2-0 {
pins {
pinmux = <STM32_PINMUX('D', 7, AF4)>, /* I2C2_SCL */
<STM32_PINMUX('G', 15, AF4)>; /* I2C2_SDA */
bias-disable;
drive-open-drain;
slew-rate = <0>;
};
};
i2c2_sleep_pins_a: i2c2-sleep-0 {
pins {
pinmux = <STM32_PINMUX('D', 7, ANALOG)>, /* I2C2_SCL */
<STM32_PINMUX('G', 15, ANALOG)>; /* I2C2_SDA */
};
};
i2c2_pins_b1: i2c2-1 {
pins {
pinmux = <STM32_PINMUX('F', 1, AF4)>, /* I2C2_SCL */
<STM32_PINMUX('F', 0, AF4)>; /* I2C2_SDA */
bias-disable;
drive-open-drain;
slew-rate = <0>;
};
};
i2c2_sleep_pins_b1: i2c2-sleep-1 {
pins {
pinmux = <STM32_PINMUX('F', 1, ANALOG)>, /* I2C2_SCL */
<STM32_PINMUX('F', 0, ANALOG)>; /* I2C2_SDA */
};
};
i2c2_pins_c: i2c2-2 {
pins {
pinmux = <STM32_PINMUX('H', 4, AF4)>, /* I2C2_SCL */
<STM32_PINMUX('H', 5, AF4)>; /* I2C2_SDA */
bias-disable;
drive-open-drain;
slew-rate = <0>;
};
};
i2c2_pins_sleep_c: i2c2-sleep-2 {
pins {
pinmux = <STM32_PINMUX('H', 4, ANALOG)>, /* I2C2_SCL */
<STM32_PINMUX('H', 5, ANALOG)>; /* I2C2_SDA */
};
};
