DESK-MX8M-L/Peripherals/I2C
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| 2025/08/06 | DESK-MX8M-L-4.x.x release | ||
Contents
Peripheral I2C[edit | edit source]
Device tree configuration[edit | edit source]
Here below an example of device tree modifications to standard DAVE's kit for the ORCA SOM:
From imx8mp-mito8mplus-cb1001.dts:
...
...
/* groove connector */
&i2c6 {
clock-frequency = <100000>;
pinctrl-names = "default";
pinctrl-0 = <&pinctrl_i2c6>;
status = "okay";
};
and from the imx8mp-mito8mplus.dtsi:
...
...
&iomuxc {
...
...
pinctrl_i2c6: i2c6grp {
fsl,pins = <
MX8MP_IOMUXC_UART4_RXD__I2C6_SCL 0x400001c3
MX8MP_IOMUXC_UART4_TXD__I2C6_SDA 0x400001c3
>;
};
...
...
Accessing the peripheral[edit | edit source]
Linux messages at boot time[edit | edit source]
... ... [ 2.194955] i2c i2c-0: IMX I2C adapter registered [ 2.201041] i2c 1-003c: Fixing up cyclic dependency with 32e40000.csi [ 2.207787] ov5640 1-003c: supply DOVDD not found, using dummy regulator [ 2.214603] ov5640 1-003c: supply AVDD not found, using dummy regulator [ 2.221263] ov5640 1-003c: supply DVDD not found, using dummy regulator [ 2.236233] i2c i2c-1: IMX I2C adapter registered [ 2.242353] i2c 2-003c: Fixing up cyclic dependency with 32e50000.csi [ 2.249107] ov5640 2-003c: supply DOVDD not found, using dummy regulator [ 2.255910] ov5640 2-003c: supply AVDD not found, using dummy regulator [ 2.262574] ov5640 2-003c: supply DVDD not found, using dummy regulator [ 2.286152] i2c i2c-2: IMX I2C adapter registered [ 2.292020] i2c 5-004c: Fixing up cyclic dependency with 32c00000.bus:ldb@32ec005c [ 2.430554] i2c i2c-5: IMX I2C adapter registered ... ...
Usage with i2ctools[edit | edit source]
root@desk-mx8mp:~# i2cdetect -y <i2c bus number> root@desk-mx8mp:~#
Additional information[edit | edit source]
A good I2C bus tutorial can be found in this video from Bootlin.
For general information, please refer to the I2C tools wiki page
