uboot changes for qspi
------------------------
file: configs/j7200_evm_a72_defconfig
+CONFIG_SPI_FLASH_ISSI=y


file: arch/arm/dts/k3-j7200-som-p0.dtsi

&wkup_pmx0 {

+        mcu_fss0_ospi0_pins_default: mcu-fss0-ospi0-pins-default {
+                pinctrl-single,pins = <
+                        J721E_WKUP_IOPAD(0x0, PIN_OUTPUT, 0) /* (B6) MCU_OSPI0_CLK */
+                        J721E_WKUP_IOPAD(0x2c, PIN_OUTPUT, 0) /* (D6) MCU_OSPI0_CSn0 */
+                        J721E_WKUP_IOPAD(0xc, PIN_INPUT, 0) /* (D8) MCU_OSPI0_D0 */  /* IO0 */
+                        J721E_WKUP_IOPAD(0x10, PIN_INPUT, 0) /* (C7) MCU_OSPI0_D1 */ /* IO1 */
+                        J721E_WKUP_IOPAD(0x14, PIN_INPUT, 0) /* (C5) MCU_OSPI0_D2 */ /* IO2 */
+                        J721E_WKUP_IOPAD(0x18, PIN_INPUT, 0) /* (A5) MCU_OSPI0_D3 */ /* IO3 */
+                >;
+        };
};

+&ospi0 {
+        pinctrl-names = "default";
+        pinctrl-0 = <&mcu_fss0_ospi0_pins_default>;
+        status="okay";
+
+        is25wp016d: flash@0 {
+                compatible = "jedec,spi-nor";
+                reg = <0x0>;
+                spi-tx-bus-width = <4>;
+                spi-rx-bus-width = <4>;
+                m25p,fast-read;
+                spi-max-frequency = <30000000>;
+                cdns,tshsl-ns = <60>;
+                cdns,tsd2d-ns = <60>;
+                cdns,tchsh-ns = <60>;
+                cdns,tslch-ns = <60>;
+                cdns,read-delay = <2>;
+                cdns,phy-mode;
+        };
+ };