AM623: How to adjust SPI CLK?

Hi Daniel,

Daniel Cheng1 said:

As shown in the figure below, the customer tried to adjust the CLK number, but it didn't work.

I suppose your associated device tree node looks something like this here...

spidev@0 {
	/*
	 * Using spidev compatible is warned loudly,
	 * thus use another equivalent compatible id
	 * from spidev.
	 */
	compatible = "rohm,dh2228fv";
	spi-max-frequency = <24000000>;
	reg = <0>;
};

What is your setting for the spi-max-frequency property, and what SPI clock frequency are you trying to configure?

Note that you cannot arbitrarily achieve any SPI clock output frequency you want, as you will be limited by what the input frequency to the SPI peripheral is on the chip (50MHz), and which integer dividers can be used to divide this down. The TRM has a table on this...

Regards, Andreas