Posting for future reference: libgpiod and python bindings work great, and
do not rely on the problematic sysfs support.

Jacek.


On Wed, Feb 28, 2018 at 9:45 PM, Jacek Radzikowski <
jacek.radzikow...@gmail.com> wrote:

> Hello,
>
> I try to access GPIO on pin P9_12 from python script using Adafruit_GPIO
> package, the pin is not available for use. Python script complains about
> missing file:
>
> ValueError: Set gpio mode failed, missing file or invalid permissions.
>
> config-pin does not see it either:
>
> $ sudo config-pin P9_12 gpio
> P9_12 pinmux file not found!
> bash: /sys/devices/platform/ocp/ocp*P9_12_pinmux/state: No such file or
> directory
> Cannot write pinmux file: /sys/devices/platform/ocp/ocp*P9_12_pinmux/state
>
> What works is exporting GPIO 60 through sys fs, and reading its value from
> /sys/class/gpio/gpio60/value
>
> With cape removed python script and config-pin work as expected. According
> to the documentation, the cape does not use this GPIO, so it should not be
> reserved.
>
> Here's output from version.sh:
> $ sudo /opt/scripts/tools/version.sh
> git:/opt/scripts/:[e307a944e0be0610ff5296e0abe4ad31a6e70daa]
> eeprom:[A335BNLTBWA51645BBWG0580]
> model:[TI_AM335x_BeagleBone_Black_Wireless]
> dogtag:[BeagleBoard.org Debian Image 2017-08-01]
> bootloader:[eMMC-(default)]:[/dev/mmcblk1]:[U-Boot
> 2017.07-00002-g61c3ee0fb5]:[location: dd MBR]
> kernel:[4.14.21-bone-rt-r13]
> nodejs:[v4.8.7]
> uboot_overlay_options:[enable_uboot_overlays=1]
> uboot_overlay_options:[uboot_overlay_pru=/lib/firmware/
> AM335X-PRU-RPROC-4-4-TI-00A0.dtbo]
> uboot_overlay_options:[enable_uboot_cape_universal=1]
> pkg:[bb-cape-overlays]:[4.4.20180223.0-0rcnee0~jessie+20180223]
> pkg:[bb-wl18xx-firmware]:[1.20170829-0rcnee2~jessie+20180104]
> pkg:[firmware-ti-connectivity]:[20170823-1rcnee0~jessie+20170830]
> groups:[debian : debian adm kmem dialout cdrom floppy audio dip video
> plugdev users systemd-journal netdev i2c bluetooth cloud9ide gpio pwm admin
> spi tisdk weston-launch xenomai]
> cmdline:[console=ttyO0,115200n8 bone_capemgr.uboot_capemgr_enabled=1
> root=/dev/mmcblk1p1 ro rootfstype=ext4 rootwait coherent_pool=1M
> net.ifnames=0 quiet]
> dmesg | grep pinctrl-single
> [    0.889759] pinctrl-single 44e10800.pinmux: 142 pins at pa f9e10800
> size 568
> dmesg | grep gpio-of-helper
> [    0.890749] gpio-of-helper ocp:cape-universal: ready
> END
>
>
> Regards,
> Jacek.
>
>
> --
> Given a choice between two theories, take the one which is funnier
>



-- 
Given a choice between two theories, take the one which is funnier

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