arm64: dts: ti: k3-j721e-som-p0: Add HyperFlash node

J721E SoM has a HyperFlash and HyperRam connected to HyperBus memory
controller, add corresponding node, pinmux and partitions for the same.
HyperBus is muxed with OSPI and only one controller can be active at a
time, therefore keep HyperBus node disabled. Bootloader will detect the
external mux state through a wkup gpio and enable the node as required.
Signed-off-by: Vaishnav Achath <vaishnav.a@ti.com>
Link: https://lore.kernel.org/r/20230513123313.11462-3-vaishnav.a@ti.comSigned-off-by: Vignesh Raghavendra <vigneshr@ti.com>

arch/arm64/boot/dts/ti/k3-j721e-som-p0.dtsi

@@ -165,6 +165,25 @@ J721E_WKUP_IOPAD(0x0028, PIN_INPUT, 0)  /* MCU_OSPI0_D7 */
 			J721E_WKUP_IOPAD(0x002c, PIN_OUTPUT, 0) /* MCU_OSPI0_CSn0 */
 		>;
 	};
+
+	mcu_fss0_hpb0_pins_default: mcu-fss0-hpb0-pins-default {
+		pinctrl-single,pins = <
+			J721E_WKUP_IOPAD(0x0, PIN_OUTPUT, 1)  /* MCU_HYPERBUS0_CK */
+			J721E_WKUP_IOPAD(0x4, PIN_OUTPUT, 1)  /* MCU_HYPERBUS0_CKn */
+			J721E_WKUP_IOPAD(0x2c, PIN_OUTPUT, 1) /* MCU_HYPERBUS0_CSn0 */
+			J721E_WKUP_IOPAD(0x54, PIN_OUTPUT, 3) /* MCU_HYPERBUS0_CSn1 */
+			J721E_WKUP_IOPAD(0x30, PIN_OUTPUT, 1) /* MCU_HYPERBUS0_RESETn */
+			J721E_WKUP_IOPAD(0x8, PIN_INPUT, 1)   /* MCU_HYPERBUS0_RWDS */
+			J721E_WKUP_IOPAD(0xc, PIN_INPUT, 1)   /* MCU_HYPERBUS0_DQ0 */
+			J721E_WKUP_IOPAD(0x10, PIN_INPUT, 1)  /* MCU_HYPERBUS0_DQ1 */
+			J721E_WKUP_IOPAD(0x14, PIN_INPUT, 1)  /* MCU_HYPERBUS0_DQ2 */
+			J721E_WKUP_IOPAD(0x18, PIN_INPUT, 1)  /* MCU_HYPERBUS0_DQ3 */
+			J721E_WKUP_IOPAD(0x1c, PIN_INPUT, 1)  /* MCU_HYPERBUS0_DQ4 */
+			J721E_WKUP_IOPAD(0x20, PIN_INPUT, 1)  /* MCU_HYPERBUS0_DQ5 */
+			J721E_WKUP_IOPAD(0x24, PIN_INPUT, 1)  /* MCU_HYPERBUS0_DQ6 */
+			J721E_WKUP_IOPAD(0x28, PIN_INPUT, 1)  /* MCU_HYPERBUS0_DQ7 */
+		>;
+	};
 };
 
 &ospi0 {
@@ -185,6 +204,58 @@ flash@0 {
 	};
 };
 
+&hbmc {
+	/* OSPI and HBMC are muxed inside FSS, Bootloader will enable
+	 * appropriate node based on board detection
+	 */
+	status = "disabled";
+	pinctrl-names = "default";
+	pinctrl-0 = <&mcu_fss0_hpb0_pins_default>;
+	ranges = <0x00 0x00 0x05 0x00000000 0x4000000>, /* 64MB Flash on CS0 */
+		 <0x01 0x00 0x05 0x04000000 0x800000>; /* 8MB RAM on CS1 */
+
+	flash@0,0 {
+		compatible = "cypress,hyperflash", "cfi-flash";
+		reg = <0x00 0x00 0x4000000>;
+
+		partitions {
+			compatible = "fixed-partitions";
+			#address-cells = <1>;
+			#size-cells = <1>;
+
+			partition@0 {
+				label = "hbmc.tiboot3";
+				reg = <0x0 0x80000>;
+			};
+
+			partition@80000 {
+				label = "hbmc.tispl";
+				reg = <0x80000 0x200000>;
+			};
+
+			partition@280000 {
+				label = "hbmc.u-boot";
+				reg = <0x280000 0x400000>;
+			};
+
+			partition@680000 {
+				label = "hbmc.env";
+				reg = <0x680000 0x40000>;
+			};
+
+			partition@6c0000 {
+				label = "hbmc.sysfw";
+				reg = <0x6c0000 0x100000>;
+			};
+
+			partition@800000 {
+				label = "hbmc.rootfs";
+				reg = <0x800000 0x3800000>;
+			};
+		};
+	};
+};
+
 &mailbox0_cluster0 {
 	status = "okay";
 	interrupts = <436>;