Hi, In this free-electrons course http://free-electrons.com/training/kernel/ it talks about setting up i2c between beagle bone black and nintendo wii nunchuk with UEXT connector. To do that I created the DTS which I have put at the end of this email. It doesn't seem to be working. When I send some bytes to the device which is on i2c1, I get "omap_i2c 4802a000.i2c: timeout waiting for bus ready" message. Feel free to ask details. Any help will be appreciated. Thanks, Okash /dts-v1/; #include "am33xx.dtsi" #include "am335x-bone-common.dtsi" / { model = "TI AM335x BeagleBone Black"; compatible = "ti,am335x-bone-black", "ti,am335x-bone", "ti,am33xx"; }; &i2c1 { status = "okay"; clock-frequency = <100000>; nunchuk@52 { compatible = "nintendo,nunchuk"; reg = <0x52>; }; }; &am33xx_pinmux { pinctrl-names = "default"; pinctrl-0 = <&i2c1_pins>; i2c1_pins: pinmux_i2c1_pins { pinctrl_single,pins = < 0x158 (PIN_INPUT_PULLUP | MUX_MODE2) /* spi0_d1.i2c1_sda */ 0x15c (PIN_INPUT_PULLUP | MUX_MODE2) /* spi0_cs0.i2c1_scl */ >; }; };