And if you need some help I can suggest you to try the code generated in
this page
<http://kilobaser.com/blog/2014-07-28-beaglebone-black-devicetreeoverlay-generator#1gpiodto>
.
At least you have the chance to check, whether your code is right or not.
You can simplify debugging of your code.
Regards
Am Mittwoch, 9. September 2015 18:41:21 UTC+2 schrieb bremenpl:
>
> Hello there,
> I just got back to my BeagleBone Black and i have no idea why but I just
> cannot change a pin configuration using overlay nor through export. This is
> what I am trying to do:
>
> I want to set P8_29 and P8_31 Pins to inputs with a pullup (0x37). here is
> my overlay:
>
> /dts-v1/;
> /plugin/;
>
> /{
> compatible = "ti,beaglebone", "ti,beaglebone-black";
> part-number = "BB-AVRDUDE";
> version = "00A0";
>
> fragment@0 {
> target = <&am33xx_pinmux>;
>
> __overlay__ {
> ebb_example: BB-AVRDUDE {
> pinctrl-single,pins = <
> 0x0E4 0x37 // P8_29, AVR #RST pin, Input Mode7 pullup
> 0x0D8 0x37 // P8_31, AVR #HWB pin, Input Mode7 pullup
>
> /* INPUT GPIO(mode7) 0x27 pulldown, 0x37 pullup,
> 0x?f no pullup/down */
> >;
> };
> };
> };
>
> fragment@1 {
> target = <&ocp>;
> __overlay__ {
> gpio_helper {
> compatible = "gpio-of-helper";
> status = "okay";
> pinctrl-names = "default";
> pinctrl-0 = <&ebb_example>;
> };
> };
> };
> };
>
> Then I load the DTS and see in the list (last). HDMI is disabled:
>
> 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,NEOSEC-TINYLCD22
> 8: ff:P-O-L Override Board Name,00A0,Override Manuf,BB-BONE-KEYS
> 9: ff:P-O-L Override Board Name,00A0,Override Manuf,BB-BONE-SPI1-2CS
> 10: ff:P-O-L Override Board Name,00A0,Override Manuf,am33xx_pwm
> 11: ff:P-O-L Override Board Name,00A0,Override Manuf,BB-COOLER
> 12: ff:P-O-L Override Board Name,00A0,Override Manuf,BB-UART5
> 13: ff:P-O-L Override Board Name,00A0,Override Manuf,BB-BUZZER
> 14: ff:P-O-L Override Board Name,00A0,Override Manuf,BB-W1
> *15: ff:P-O-L Override Board Name,00A0,Override Manuf,BB-AVRDUDE*
>
>
> Dmesg says it was OK:
>
> root@beaglebone:~# dmesg | grep BB-AVRDUDE
> [ 151.732517] bone-capemgr bone_capemgr.9: part_number 'BB-AVRDUDE',
> version 'N/A'
> [ 151.732633] bone-capemgr bone_capemgr.9: slot #15: 'Override Board
> Name,00A0,Override Manuf,BB-AVRDUDE'
> [ 151.732729] bone-capemgr bone_capemgr.9: slot #15: Requesting part
> number/version based 'BB-AVRDUDE-00A0.dtbo
> [ 151.732744] bone-capemgr bone_capemgr.9: slot #15: Requesting firmware
> 'BB-AVRDUDE-00A0.dtbo' for board-name 'Override Board Name', version '00A0'
> [ 151.736445] bone-capemgr bone_capemgr.9: slot #15: dtbo
> 'BB-AVRDUDE-00A0.dtbo' loaded; converting to live tree
>
>
> Then I check the pins and they remain as they were in default:
>
> root@beaglebone:~# cat $PINS | grep "pin 57"
> pin 57 (44e108e4) 00000027 pinctrl-single
> root@beaglebone:~# cat $PINS | grep "pin 54"
> pin 54 (44e108d8) 0000002f pinctrl-single
>
>
> Did I forget something? I really cant think of anything. I would really
> apreciate all help here!
>
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