I have specified two spi node resources in the device tree, one is the spi@3230000 of the orin module and the other is the GPIO emulating spi node. The driver file uses two spi resources respectively to read the ADC device data, and both call the kernel function spi_read. But it has a different execution effect.
I have calculated the time of spi@3230000 executing 500 spi_read functions, the average time is 10ms, the maximum is 25ms, and the minimum is 0.02ms. but the average execution time of spi simulation is 0.3ms, the maximum is 0.8ms, and the minimum is 0.3ms.
The execution effect of the two spi_read is quite different. What might be the reason?