Device tree with beaglebone black

I want to interface bmp085 with beaglebone black at i2c1(pin17 and pin18)
So made following changes
-I made changes in /ksrc/arch/arm/boot/dts/am335x-bone-common.dtsi

i2c0_pins:pinmux_i2c0_pins{
         pinctrl-single,pins=<
          0x188 0x70 /*i2c0_sda, SLEWCTRL_SLOW | INPUT_PULLUP | MODE0 */
          0x18c 0x70 /* i2c0_scl, SLEWCTRL_SLOW | INPUT_PULLUP | MODE0*/
          >;
};
/*changed by jaikothari10@gmail.com*/
i2c1_pins:pinmux_i2c1_pins{
         pinctrl-single,pins=<
             0x158 0x72 /* (PIN_INPUT_PULLUP | MUX_MODE2) */
             0x15c 0x72 /* (PIN_INPUT_PULLUP | MUX_MODE2) */
             >;
};
/******************************/
i2c2_pins: pinmux_i2c2_pins {
pinctrl-single,pins = <
        0x178 0x73 /*uart1_ctsn,i2c2_sda,SLEWSTRL_SLOW | INPUT_PULLUP | MODE3*/
        0x17c 0x73 /*uart1_rtsn,i2c2_scl,SLEWCTRL_SLOW | INPUT_PULLUP | MODE3 */
       >;
};

Now look at binding document of bmp085 module. (ksrc/Document/devicetree/bindings/misc/bmp085.txt and then make change

/********added by jaikothari10@gmail.com********/
&i2c1 {
   pinctrl-names="default";
  pinctrl-0= <&i2c1_pins>;

  status = "okay"
  clock-frequency=<100000>;
  pressure@77{                                  /*client module for i2c */
              compatible="bosch,bmp085";
              reg=,0x77>;
             chip-id=<10>;
             temp-measurement-period = <100>;
             default-sampling = <2>;
 };

Now look at file am33xx.dtsi file (This is master /ksrc/drivers/i2c/buses)
i2c1:i2c@4802a000 {
 compatible="ti,omap4-i2c";
  #address-cells=<1>;
  #size-cell=<0>;
 ti,hwmods="i2c2",
 reg=<04802a000 0x1000>;
 status= "disable";
};

After doing the following steps I compiled the dts file to dtb by dtc (device tree compiler)

$dtc -O dtb -o am335-boneblack.dtb am335x-boneblack.dts

After compile put the dtb file in /boot of BBB rootfs

Then Reboot BBB

Now you will find the /dev/i2c1 entry. Also your bmp085 module would be loaded automatically.

Amazing!!!!!!! Keep smiling :)

For device tree information you can refrer device tree documentation in kernel.More refreances I would add latter.
You can even post comment to this blog if any query?