I'm using the i2c bus 2 that appears on P9_21 and P9_22 on the Bone Black.

If I run:
bone$ *config-pin P9_21 i2c*
bone$ *config-pin P9_22 i2c*

My i2c bus doesn't work, but if I run:
bone$ *config-pin P9_21 gpio*
bone$ *config-pin P9_22 **gpio*

it does?  What's up?

--Mark

sudo /opt/scripts/tools/version.sh 
[sudo] password for debian: 
git:/opt/scripts/:[ed7dd4c61a9c9307b08db8a7dcbaffac77a7f776]
eeprom:[A335BNLT0A5C3513BBBK3281]
model:[TI_AM335x_BeagleBone_Black]
dogtag:[BeagleBoard.org Debian Image 2018-07-02]
bootloader:[microSD-(push-button)]:[/dev/mmcblk0]:[U-Boot 
2018.03-00002-gac9cce7c6a]:[location: dd MBR]
bootloader:[eMMC-(default)]:[/dev/mmcblk1]:[U-Boot 
2016.03-00001-g9a81f4a]:[location: dd MBR]
kernel:[4.18.1-bone4]
nodejs:[v6.14.3]
uboot_overlay_options:[enable_uboot_overlays=1]
uboot_overlay_options:[disable_uboot_overlay_video=1]
uboot_overlay_options:[uboot_overlay_pru=/lib/firmware/AM335X-PRU-RPROC-4-14-TI-00A0.dtbo]
uboot_overlay_options:[enable_uboot_cape_universal=1]
pkg check: to individually upgrade run: [sudo apt install --only-upgrade 
<pkg>]
pkg:[bb-cape-overlays]:[4.4.20180628.0-0rcnee0~stretch+20180628]
pkg:[bb-wl18xx-firmware]:[1.20180517-0rcnee0~stretch+20180517]
pkg:[kmod]:[23-2rcnee1~stretch+20171005]
pkg:[roboticscape]:[0.4.4-git20180608.0-0rcnee0~stretch+20180609]
pkg:[firmware-ti-connectivity]:[20170823-1rcnee1~stretch+20180328]
groups:[debian : debian adm kmem dialout cdrom floppy audio dip video 
plugdev users systemd-journal i2c bluetooth netdev cloud9ide gpio pwm eqep 
admin spi tisdk weston-launch xenomai]
cmdline:[console=ttyO0,115200n8 bone_capemgr.uboot_capemgr_enabled=1 
root=/dev/mmcblk0p1 ro rootfstype=ext4 rootwait coherent_pool=1M 
net.ifnames=0 quiet]
dmesg | grep pinctrl-single
[    1.368684] pinctrl-single 44e10800.pinmux: 142 pins, size 568
dmesg | grep gpio-of-helper
[    1.398397] gpio-of-helper ocp:cape-universal: ready
END

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