arm: mach-k3: am642_init: Do USB fixups to facilitate host and device boot modes

U-Boot either supports USB host or device mode for a node at a time in the
device tree nodes. To support both host and dfu bootmodes, dr_mode is set
to "peripheral" by default and then fixed based on the mode selected by
the boot mode config dip switches on the board.

This needs to happen before the cdns3 generic layer binds the usb device
to a host or a device driver. Therefore, use fdtdec_setup_board()
implementation to fixup the device tree property.

Signed-off-by: Aswath Govindraju <a-govindraju@ti.com>

arch/arm/mach-k3/am642_init.c

@@ -8,6 +8,7 @@
  */
 
 #include <common.h>
+#include <fdt_support.h>
 #include <spl.h>
 #include <asm/io.h>
 #include <asm/arch/hardware.h>
@@ -82,6 +83,38 @@ void k3_mmc_stop_clock(void) {}
 void k3_mmc_restart_clock(void) {}
 #endif
 
+#if CONFIG_IS_ENABLED(USB_STORAGE)
+static int fixup_usb_boot(const void *fdt_blob)
+{
+	int ret = 0;
+
+	switch (spl_boot_device()) {
+	case BOOT_DEVICE_USB:
+		/*
+		 * If the boot mode is host, fixup the dr_mode to host
+		 * before cdns3 bind takes place
+		 */
+		ret = fdt_find_and_setprop((void *)fdt_blob,
+					   "/bus@f4000/cdns-usb@f900000/usb@f400000",
+					   "dr_mode", "host", 11, 0);
+		if (ret)
+			printf("%s: fdt_find_and_setprop() failed:%d\n",
+			       __func__, ret);
+		fallthrough;
+	default:
+		break;
+	}
+
+	return ret;
+}
+
+int fdtdec_board_setup(const void *fdt_blob)
+{
+	/* Can use the pointer from the function parameters */
+	return fixup_usb_boot(fdt_blob);
+}
+#endif
+
 void board_init_f(ulong dummy)
 {
 #if defined(CONFIG_K3_LOAD_SYSFW)