Hi, I would like to change the i2c frequency from 100 kHz to 400 kHz for the i2c busses which are not used for HDMI.
If I check the dmesg during boot I get: (dmese | grep "i2c") 0.134577] omap_i2c 44e0b000.i2c: bus 0 rev0.11 at 400 kHz [ 0.135557] input: tps65217_pwr_but as /devices/ocp.3/44e0b000.i2c/i2c-0/0-0024/input/input0 [ 0.144248] omap_i2c 44e0b000.i2c: unable to select pin group [ 0.144783] omap_i2c 4819c000.i2c: bus 1 rev0.11 at 100 kHz [ 0.146172] omap_i2c 4819c000.i2c: unable to select pin group [ 0.742131] i2c /dev entries driver [ 9.442219] omap_i2c 4802a000.i2c: bus 2 rev0.11 at 100 kHz [ 9.442248] omap_i2c 4802a000.i2c: unable to select pin group So I changed the all clock frequencies from 100 k to 400 k inside the dtb files which are loaded during boot: am335x-bone.dtb am335x-boneblack.dtb omap3-beagle.dtb But no reaction at all. I double checked with the osci but still only 10 us clock period (100 k). Then I ve checked the the clock frequency register and there it is the same too: od -bc /proc/device-tree/ocp/i2c\@4802a000/clock-frequency I could try to change the values there using mmap but I would prefer a solution using the overlays. Or is it not possible to change it. Kind regards, Constantin -- 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. For more options, visit https://groups.google.com/d/optout.