On Tue, Dec 4, 2018 at 1:18 PM <james...@gmail.com> wrote: > > Hi everyone, > I'm trying to add at least three additional GPIO chip selects in addition to > the existing hardware CS for SPI0. I found a tutorial here: > https://dev.iachieved.it/iachievedit/gpio-chip-selects-with-the-beaglebone/ > However, I'm trying to get this to work with the latest U-boot overlays. I've > modified the device tree file, compiled it, added it to /boot/uEnv.txt under > uboot_overlay_addr4. However, I'm getting this error on boot: > > [ 1.565570] pinctrl-single 44e10800.pinmux: pin PIN84 already requested by > ocp:P9_22_pinmux; cannot claim for 48030000.spi > [ 1.576764] pinctrl-single 44e10800.pinmux: pin-84 (48030000.spi) status > -22 > [ 1.583861] pinctrl-single 44e10800.pinmux: could not request pin 84 > (PIN84) from group pinmux_bb_spi0_pins on device pinctrl-single > [ 1.595922] omap2_mcspi 48030000.spi: Error applying setting, reverse > things back > [ 1.603527] omap2_mcspi: probe of 48030000.spi failed with error -22 > > Based on my understanding, it looks like the universal cape overlay has > already claimed the pins, and I'm now unable to set my own settings for the > pin. Is there any way around this without decompiling / editing the universal > cape overlay? Are there any guides on how to do this with uboot overlays? > Unfortunately almost all the documentation revolving device trees on > Beaglebone still revolve around the old slots architecture, and very little > documentation is available for uboot overlays.
So the issue is, P9_22 is taken by the cape-universal, so you can't use it for spi.. 2 options: disable cape-universal in /boot/uEnv.txt Or upgrade to v4.14.x-ti, which has cape-universal only take the pins un-used.. To better assist you with the 2nd option, please share the output of: sudo /opt/scripts/tools/version.sh Regards, -- Robert Nelson https://rcn-ee.com/ -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to beagleboard+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/beagleboard/CAOCHtYhSUYS%2BiBUwO9zUh7hCyiea5-RW8ahRp-J4daKC-D4e0g%40mail.gmail.com. For more options, visit https://groups.google.com/d/optout.
