AM623: spi chip select

Hi, TI expert! 

From the datasheet of am62x, the following information can be obtained:

I configured the SPI according to the following settings. I tested the SPI chip select pin using an oscilloscope, and the measurement result showed that the level of the SPI chip select pin did not change.

&main_pmx0 {
	main_spi0_pins_default: main-spi0-pins-default {
		pinctrl-single,pins = <
			AM62X_IOPAD(0x01bc, PIN_OUTPUT, 0) /* (A14) SPI0_CLK */
			AM62X_IOPAD(0x01d0, PIN_OUTPUT, 1) /* (A15) UART0_CTSn.SPI0_CS2 */
			AM62X_IOPAD(0x01d4, PIN_OUTPUT, 1) /* (B15) UART0_RTSn.SPI0_CS3 */
			AM62X_IOPAD(0x01c0, PIN_OUTPUT, 0) /* (B13) SPI0_D0 */
			AM62X_IOPAD(0x01c4, PIN_INPUT, 0) /* (B14) SPI0_D1 */
		>;
	};
};

&main_spi0 {
	pinctrl-names = "default";
	pinctrl-0 = <&main_spi0_pins_default>;
	#address-cells = <1>;
	#size-cells= <0>;
	ti,spi-num-cs = <2>;
	ti,pindir-d0-out-d1-in = <1>;
	status = "okay";
};

I want to know what caused this problem and how to solve it?

Regards,

Li