Trying to read a second I2C bus gives "controller timed out"

[Madhu K]

Hi All,

I am trying to read a second I2C bus but it gives "controller timed out" message.

below is the log for same.

[root /]# i2cdetect -y -r 1
     0  1  2  3  4  5  6  7  8  9  a  b  c  d  e  f
00:          [ 1188.831062] omap_i2c 4802a000.i2c: controller timed out
-- [ 1189.831029] omap_i2c 4802a000.i2c: controller timed out
-- [ 1190.851032] omap_i2c 4802a000.i2c: controller timed out
...
...
70: [ 1299.991028] omap_i2c 4802a000.i2c: controller timed out
-- [ 1301.011026] omap_i2c 4802a000.i2c: controller timed out
-- [ 1302.031024] omap_i2c 4802a000.i2c: controller timed out
-- [ 1303.051030] omap_i2c 4802a000.i2c: controller timed out
-- [ 1304.071025] omap_i2c 4802a000.i2c: controller timed out
-- [ 1305.091028] omap_i2c 4802a000.i2c: controller timed out
-- [ 1306.111024] omap_i2c 4802a000.i2c: controller timed out
-- [ 1307.131027] omap_i2c 4802a000.i2c: controller timed out



Below are the changes I have done in .dts an .dtsi files.


changes made in am335x-bone-common.dtsi:
        i2c1_pins: pinmux_i2c1_pins {
                pinctrl-single,pins = <
                        AM33XX_IOPAD(0x958, PIN_INPUT_PULLUP | MUX_MODE2)       /* spi0_d1.i2c1_sda */
                        AM33XX_IOPAD(0x95c, PIN_INPUT_PULLUP | MUX_MODE2)       /* spi0_cs0.i2c1_scl */
                >;
        };

&i2c1 {
        pinctrl-names = "default";
        pinctrl-0 = <&i2c1_pins>;

        status = "okay";
        clock-frequency = <100000>;
};



changes made in am335x-boneblack.dts:

&i2c1 {
        nunchuk: nunchuck@52 {

                compatible = "nunchuk";
                reg = <0x52>;
        };
};

apart from these changes, should I change anything else in bootloader files? or anything else to be added to the device tree files?

please help me out to solve this issue.

Regards,
Madhu