arm64: dts: ti: k3-am68-sk-som: Add support for OSPI flash

AM68 SK has an OSPI NOR flash on its SOM connected to OSPI0 instance.
Enable support for the same. Also, describe the OSPI flash partition
information through the device tree, according to the offsets in the
bootloader.

Signed-off-by: Sinthu Raja <sinthu.raja@ti.com>
Signed-off-by: Udit Kumar <u-kumar1@ti.com>
Link: https://lore.kernel.org/r/20240622161835.3610348-1-u-kumar1@ti.com
Signed-off-by: Vignesh Raghavendra <vigneshr@ti.com>

Author: sinthu-raja

arch/arm64/boot/dts/ti/k3-am68-sk-som.dtsi

@@ -131,6 +131,25 @@
 	};
 };
 
+&wkup_pmx0 {
+	mcu_fss0_ospi0_pins_default: mcu-fss0-ospi0-pins {
+		bootph-all;
+		pinctrl-single,pins = <
+			J721S2_WKUP_IOPAD(0x000, PIN_OUTPUT, 0) /* (D19) MCU_OSPI0_CLK */
+			J721S2_WKUP_IOPAD(0x02c, PIN_OUTPUT, 0) /* (F15) MCU_OSPI0_CSn0 */
+			J721S2_WKUP_IOPAD(0x00c, PIN_INPUT, 0) /* (C19) MCU_OSPI0_D0 */
+			J721S2_WKUP_IOPAD(0x010, PIN_INPUT, 0) /* (F16) MCU_OSPI0_D1 */
+			J721S2_WKUP_IOPAD(0x014, PIN_INPUT, 0) /* (G15) MCU_OSPI0_D2 */
+			J721S2_WKUP_IOPAD(0x018, PIN_INPUT, 0) /* (F18) MCU_OSPI0_D3 */
+			J721S2_WKUP_IOPAD(0x01c, PIN_INPUT, 0) /* (E19) MCU_OSPI0_D4 */
+			J721S2_WKUP_IOPAD(0x020, PIN_INPUT, 0) /* (G19) MCU_OSPI0_D5 */
+			J721S2_WKUP_IOPAD(0x024, PIN_INPUT, 0) /* (F19) MCU_OSPI0_D6 */
+			J721S2_WKUP_IOPAD(0x028, PIN_INPUT, 0) /* (F20) MCU_OSPI0_D7 */
+			J721S2_WKUP_IOPAD(0x008, PIN_INPUT, 0) /* (E18) MCU_OSPI0_DQS */
+		>;
+	};
+};
+
 &wkup_pmx2 {
 	wkup_i2c0_pins_default: wkup-i2c0-default-pins {
 		pinctrl-single,pins = <
@@ -153,6 +172,68 @@
 	};
 };
 
+&ospi0 {
+	status = "okay";
+	pinctrl-names = "default";
+	pinctrl-0 = <&mcu_fss0_ospi0_pins_default>;
+
+	flash@0 {
+		compatible = "jedec,spi-nor";
+		reg = <0x0>;
+		spi-tx-bus-width = <8>;
+		spi-rx-bus-width = <8>;
+		spi-max-frequency = <25000000>;
+		cdns,tshsl-ns = <60>;
+		cdns,tsd2d-ns = <60>;
+		cdns,tchsh-ns = <60>;
+		cdns,tslch-ns = <60>;
+		cdns,read-delay = <4>;
+
+		partitions {
+			bootph-all;
+			compatible = "fixed-partitions";
+			#address-cells = <1>;
+			#size-cells = <1>;
+
+			partition@0 {
+				label = "ospi.tiboot3";
+				reg = <0x0 0x80000>;
+			};
+
+			partition@80000 {
+				label = "ospi.tispl";
+				reg = <0x80000 0x200000>;
+			};
+
+			partition@280000 {
+				label = "ospi.u-boot";
+				reg = <0x280000 0x400000>;
+			};
+
+			partition@680000 {
+				label = "ospi.env";
+				reg = <0x680000 0x40000>;
+			};
+
+			partition@740000 {
+				label = "ospi.env.backup";
+				reg = <0x740000 0x40000>;
+			};
+
+			partition@800000 {
+				label = "ospi.rootfs";
+				reg = <0x800000 0x37c0000>;
+			};
+
+			partition@3fc0000 {
+				bootph-pre-ram;
+				label = "ospi.phypattern";
+				reg = <0x3fc0000 0x40000>;
+			};
+		};
+	};
+};
+
 &mailbox0_cluster0 {
 	status = "okay";
 	interrupts = <436>;