arm: socfpga: socrates: Probe DWC2 UDC from OF instead of hard-coded data

This patch adds the necessary OF alias for the UDC node, which let's
the code locate the DWC2 UDC base address in OF instead of hard-coding
it into the U-Boot binary. The code is adjusted to use the address from
OF instead of the hard-coded one. Finally, the hard-coded address is
removed and USB DM support is enabled.

Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Chin Liang See <clsee@altera.com>
Cc: Dinh Nguyen <dinguyen@opensource.altera.com>
Cc: Lukasz Majewski <l.majewski@majess.pl>
Cc: Lukasz Majewski <l.majewski@samsung.com>

arch/arm/dts/socfpga_cyclone5_socrates.dts

@@ -14,6 +14,10 @@
 		bootargs = "console=ttyS0,115200";
 	};
 
+	aliases {
+		udc0 = &usb1;
+	};
+
 	memory {
 		name = "memory";
 		device_type = "memory";
@@ -72,3 +76,7 @@
 		tslch-ns = <4>;
 	};
 };
+
+&usb1 {
+	status = "okay";
+};

board/ebv/socrates/socfpga.c

@@ -5,12 +5,12 @@
  */
 
 #include <common.h>
+#include <errno.h>
 #include <asm/arch/reset_manager.h>
 #include <asm/io.h>
 
 #include <usb.h>
 #include <usb/dwc2_udc.h>
-#include <usb_mass_storage.h>
 
 DECLARE_GLOBAL_DATA_PTR;
 
@@ -29,12 +29,29 @@ int board_init(void)
 
 #ifdef CONFIG_USB_GADGET
 struct dwc2_plat_otg_data socfpga_otg_data = {
-	.regs_otg	= CONFIG_USB_DWC2_REG_ADDR,
 	.usb_gusbcfg	= 0x1417,
 };
 
 int board_usb_init(int index, enum usb_init_type init)
 {
+	int node[2], count;
+	fdt_addr_t addr;
+
+	count = fdtdec_find_aliases_for_id(gd->fdt_blob, "udc",
+					   COMPAT_ALTERA_SOCFPGA_DWC2USB,
+					   node, 2);
+	if (count <= 0)	/* No controller found. */
+		return 0;
+
+	addr = fdtdec_get_addr(gd->fdt_blob, node[0], "reg");
+	if (addr == FDT_ADDR_T_NONE) {
+		printf("UDC Controller has no 'reg' property!\n");
+		return -EINVAL;
+	}
+
+	/* Patch the address from OF into the controller pdata. */
+	socfpga_otg_data.regs_otg = addr;
+
 	return dwc2_udc_probe(&socfpga_otg_data);
 }
 

configs/socfpga_socrates_defconfig

@@ -22,3 +22,5 @@ CONFIG_SYS_NS16550=y
 CONFIG_CADENCE_QSPI=y
 CONFIG_DESIGNWARE_SPI=y
 CONFIG_DM_MMC=y
+CONFIG_USB=y
+CONFIG_DM_USB=y

include/configs/socfpga_socrates.h

@@ -52,9 +52,6 @@
 #define CONFIG_ENV_OFFSET		512	/* just after the MBR */
 
 /* USB */
-#ifdef CONFIG_CMD_USB
-#define CONFIG_USB_DWC2_REG_ADDR	SOCFPGA_USB1_ADDRESS
-#endif
 #define CONFIG_G_DNL_MANUFACTURER      "EBV"
 
 /* Extra Environment */