Enable Device Tree Overlay for Beaglebone Black linux 4.14-ti - linux

Question

I have a problem with Devicetree overlay.
My overlay file is here;
/{
compatible = "ti,beaglebone", "ti,beaglebone-black";
/* Identification */
part_number = "GPIO_Overlays";
/* Version */
version = "00A0";
exclusive-use =
"P9.31",
"P9.17",
"P9.29",
"P9.18",
"P9.28",
"P9.27",
"P9.30",
"P9.24",
"P9.26",
"P9.20";
/* To be Continue */
/*
* Free up the pins used by the cape from the pinmux helpers.
*/
fragment#0{
target = <&ocp>;
__overlay__{
P9_31_pinmux { status = "disabled"; };
P9_17_pinmux { status = "disabled"; };
P9_29_pinmux { status = "disabled"; };
P9_18_pinmux { status = "disabled"; };
P9_28_pinmux { status = "disabled"; };
P9_27_pinmux { status = "disabled"; };
P9_30_pinmux { status = "disabled"; };
P9_24_pinmux { status = "disabled"; };
P9_26_pinmux { status = "disabled"; };
P9_20_pinmux { status = "disabled"; };
};
};
/*
* Free up the gpios used by the cape-universal gpio helpers.
*/
fragment#1 {
target = <&ocp>;
__overlay__{
cape-universal { status = "disabled"; };
};
};
/*
* Setting up to gpio pins.
*/
fragment#2{
target = <&am33xx_pinmux>;
__overlay__{
GPIO_Overlays: GPIO_Overlays{
pinctrl-single,pins = <
0x190 0x37 /* Input_PullUp | Mode 7 */
0x15C 0x37 /* Input_PullUp | Mode 7 */
0x194 0x37 /* Input_PullUp | Mode 7 */
0x158 0x17 /* Output_PullUp | Mode 7 */
0x19C 0x37 /* Input_PullUp | Mode 7 */
0x1a4 0x37 /* Input_PullUp | Mode 7 */
0x198 0x17 /* Output_PullUp | Mode 7 */
0x184 0x17 /* Output_PullUp | Mode 7 */
0x180 0x17 /* Output_PullUp | Mode 7 */
0x178 0x17 /* Output_PullUp | Mode 7 */
/* BONE_P9_20 (PIN_OUTPUT_PULLDOWN | MUX_MODE7) */
>;
};
};
};
fragment#3{
target = <&ocp>;
__overlay__{
GPIO{
compatible = "gpio-keys";
status = "okay";
pinctrl-names = "default";
pinctrl-0 = <&GPIO_Overlays>;
};
};
};};
Then I add this .dts file to lib/firmware.
I have compiled this .dts file. The output is .dtbo file.
My compile method is here;
dtc -O dtb -o /lib/firmware/GPIO_Overlays-00A0.dtbo -b 0 -# /lib/firmware/GPIO_Overlays-00A0.dts
When I reboot the BBB, These pins are reverting to their old state.
What is the worng? I couldn't solve this problem.
Can anyone help me?
Note: I use the linux-4.14-rt and debian 9.5.
EDIT: When I reboot the BBB, I get this error.
[ 0.717426] pinctrl-single 44e10800.pinmux: pin PIN13 already requested by ocp:helper; cannot claim for ocp:P8_11_pinmux
[ 0.728435] pinctrl-single 44e10800.pinmux: pin-13 (ocp:P8_11_pinmux) status -22
[ 0.736399] pinctrl-single 44e10800.pinmux: could not request pin 13 (PIN13) from group pinmux_P8_11_default_pin on device pinctrl-single
[ 0.750487] bone-pinmux-helper ocp:P8_11_pinmux: Error applying setting, reverse things back

Answer 1

See here: https://github.com/beagleboard/BeagleBoard-DeviceTrees
There you can see how they produce specific .dts files and then you can rebuild their entire .dts file archive into a few of your changed favorites.
Also, I think to build after cloning, one would just type make in the dir.
So:
git clone https://github.com/beagleboard/BeagleBoard-DeviceTrees
cd BeagleBoard-DeviceTrees
look around in src/arm and src/arm/overlays
change up what you think may need changing and then...
make
That may be a cure to you worries.