Hi all,
I started using Beaglebone Black with Debian 7.9 for my project and I'm
trying to load my own device-tree overlay in order to get more GPIO pins
available. I need to use P8.46 pin as GPIO (Mode7) pin. I've disabled HDMI
cape and then built custom dts to configure P8.46 pin as GPIO pin (mode7,
output, pull-down):
/dts-v1/;
/plugin/;
/{
compatible = "ti,beaglebone", "ti,beaglebone-black";
part_number = "BS_PINMODE_P8_46_0x7";
exclusive-use =
"P8.46",
"gpio2_7";
fragment@0 {
target = <&am33xx_pinmux>;
__overlay__ {
bs_pinmode_P8_46_0x7: pinmux_bs_pinmode_P8_46_0x7 {
pinctrl-single,pins = <0x0a4 0x7>;
};
};
};
fragment@1 {
target = <&ocp>;
__overlay__ {
bs_pinmode_P8_46_0x7_pinmux {
compatible = "bone-pinmux-helper";
status = "okay";
pinctrl-names = "default";
pinctrl-0 = <&bs_pinmode_P8_46_0x7>;
};
};
};
};
Then I've compiled dts and put dtbo in /lib/firmware. I can load the
overlay manually:
root@beaglebone:~# cat /sys/devices/bone_capemgr.9/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
7: ff:P-O-L Override Board Name,00A0,Override Manuf,bspm_P8_46_7
But when I tried to check pin config I got the next output:
root@beaglebone:~# cat /sys/kernel/debug/pinctrl/44e10800.pinmux/pins |
grep "pin 71"
pin 71 (44e1091c) 00000000 pinctrl-single
What's wrong with my dts why I can't change muxing for the pin? What am I
missing?
--
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