‘t have scope to measure clock rate, but you still can give it a try.
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please follow up https://tinkerboarding.co.uk/wiki/index....are#Kernel to download kernel of Tinkerboard.
and push my attachment(you can modify frequency as you want) to kernel/arch/arm/boot/dts/overlays/
then, you can start to build kernel. after building, copy kernel/arch/arm/boot/dts/overlays/i2c-clock-freq.dtbo to /boot/overlays/ of tinkerboard.
and modify /boot/hw_intf.conf as below
intf:i2c1=on
intf:i2c4=on
intf:dtoverlay=i2c-clock-freq
after rebooting, check with "xxd /proc/device-tree/i2c@ff650000/clock-frequency"
P.S. mapping table as below:
i2c@ff650000 ->I2C0
i2c@ff140000 ->I2C1
i2c@ff660000 ->I2C2
i2c@ff150000 ->I2C3
i2c@ff160000 ->I2C4
i2c@ff170000 ->I2C5
原文：https://www.cnblogs.com/bzhao/p/10884453.html