Well, uboot_overlay_addr4=/lib/firmware/BB-I2C2-FAST-00A0.dtbo works!
Unfortunately I now need to use i2c bus 1 on pins P9_24 and P9_26. BB-I2C
*1*-FAST-00A0.dtbo is set up for P9_17 and P9_18.
It's not hard to edit the source, but how do I compile it so it find the
include files?
--Mark
On Wednesday, October 24, 2018 at 5:08:31 PM UTC-4, Mark A. Yoder wrote:
>
> I'd like to change the i2c bus 2 to 400kHz.
>
> I see it's currently running at 100kHz.
>
> bone$ *dmesg | grep i2c*
> [ 0.622594] omap_i2c 44e0b000.i2c: could not find pctldev for node
> /ocp/l4_wkup@44c00000/scm@210000/pinmux@800/pinmux_i2c0_pins, deferring
> probe
> [ 0.623608] omap_i2c 4802a000.i2c: bus 1 rev0.11 at 100 kHz
> [ 0.625035] omap_i2c 4819c000.i2c: *bus 2 rev0.11 at 100 kHz*
> [ 1.357694] i2c /dev entries driver
> [ 1.543350] input: tps65217_pwr_but as
> /devices/platform/ocp/44e0b000.i2c/i2c-0/0-0024/tps65217-pwrbutton/input/input0
> [ 1.544568] omap_i2c 44e0b000.i2c: bus 0 rev0.11 at 400 kHz
>
> The speed appears to be set here:
>
> bone$ *uname -a*
> Linux beaglebone 4.14.52-ti-rt-r60 #1 SMP PREEMPT Tue Jun 26 23:28:55 UTC
> 2018 armv7l GNU/Linux
> bone$ *cd /opt/source/dtb-4.14-ti/src/arm/*
>
> Looking in am335x-bone-common.dtsi I see:
> &i2c2 {
> pinctrl-names = "default";
> //pinctrl-0 = <&i2c2_pins>;
> pinctrl-0 = <>;
>
> status = "okay";
> clock-frequency = <100000>;
>
> I assume I can change the clock-frequency to 400000.
> But what do I do next? I don't see am335x-bone-common.dtsi in
> /boot//boot/dtbs/4.14.52-ti-r60.
>
> Or, is there way way to change the clock after booting?
>
> Thanks...
>
> --Mark
>
>
--
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