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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