Hello All,
I am a newbie to Linux and trying to figure out how device tree overlay
works...
So after googling for many days, I came up with below device tree:
/dts-v1/;
/plugin/;
/ {
compatible = "ti,beaglebone", "ti,beaglebone-black";
/* identification */
part-number = "MY-LED";
version = "00A0";
/* state the resources this cape uses */
exclusive-use =
/* the pin header uses */
"P9.12", /* GPIO*/
/* the hardware ip uses */
"gpio0";
fragment@0 {
target = <&am33xx_pinmux>;
__overlay__ {
bb_mygpio_pins: pinmux_bb_mygpio_pins {
pinctrl-single,pins = <
0x870 0x07 /* output
mode | MODE7, see Pin_Configuration.pdf in BBB */
>;
};
};
};
fragment@1 {
target = <&ocp>; /* not sure why it is not gpio0 */
__overlay__ {
status = "okay";
pinctrl-names = "default";
pinctrl-0 = <&bb_mygpio_pins>;
};
};
};
I was able to "build" the dtc and generated MY-LED-00A0.dtbo
I then copied the MY-LED-00A0.dtbo to /lib/firmware
Then i echoed it to slots:
echo MY-LED > $SLOTS
and cat $SLOTS gives me below result:
root@beaglebone:/lib/firmware# cat $SLOTS
0: 54:PF---
1: 55:PF---
2: 56:PF---
3: 57:PF---
4: ff:P-O-L Bone-LT-eMMC-2G,00A0,Texas Instrument,BB-BONE-EMMC-2G
5: ff:P-O-- Bone-Black-HDMI,00A0,Texas Instrument,BB-BONELT-HDMI
6: ff:P-O-- Bone-Black-HDMIN,00A0,Texas Instrument,BB-BONELT-HDMIN
9: ff:P-O-L Override Board Name,00A0,Override Manuf,MY-LED
By looks of this, MY_LED seems to be loaded...
The main confusion is how can I use MY-LED?
Where are the files for MY-LED present?
Any help or guidance is much appreciated.
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