How to set spi max frequency more than 24MHz?

Robotics & Edge Computing Jetson & Embedded Systems Jetson TX2
1

Hi,
On my device tree, the spi-max-frequency of node spidev is <33000000>,
spidev_test as my test demo,
When I type follow command:
./spidev_test -D /dev/spidev3.0 -s 33000000
it works well, but I use Oscilloscope to detect spi frequency, it shows only 24MHz,
so…What can I do to increate spi frequency?

3

Have below command to enable the debug message. spi-tegra114.c is the kernel spi controller driver

sudo su
echo file spi-tegra114.c +p > /sys/kernel/debug/dynamic_debug/control
echo file spi-tegra124-slave.c +p > /sys/kernel/debug/dynamic_debug/control
5

I executed these commands, what’s next step I should do?

6

Run the spidev_test and check the kernel message by dmesg

8

I already solved the problem…
Anyway, thanks for kindly supporting…