usb: musb-new: Fix improper musb host pointer

When MUSB is operating in peripheral mode, probe registering
musb core using musb_register which intern return int value
for validation. so there is no scope to preserve struct musb
pointer but the same can be used in .remove musb_stop.
So fix this by return musb_register with struct musb pointer.

Cc: Igor Grinberg <grinberg@compulab.co.il>
Cc: Purna Chandra Mandal <purna.mandal@microchip.com>
Tested-by: Chen-Yu Tsai <wens@csie.org> # A33-OlinuXino
Tested-by: Jagan Teki <jagan@amarulasolutions.com>
Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>

board/compulab/cm_t3517/cm_t3517.c

@@ -74,8 +74,8 @@ static void cm_t3517_musb_init(void)
 			CONF2_REFFREQ_13MHZ | CONF2_SESENDEN |
 			CONF2_VBDTCTEN | CONF2_DATPOL);
 
-	if (musb_register(&cm_t3517_musb_pdata, &cm_t3517_musb_board_data,
+	if (!musb_register(&cm_t3517_musb_pdata, &cm_t3517_musb_board_data,
-			  (void *)AM35XX_IPSS_USBOTGSS_BASE))
+			   (void *)AM35XX_IPSS_USBOTGSS_BASE))
 		printf("Failed initializing AM35x MUSB!\n");
 }
 #else

drivers/usb/musb-new/musb_uboot.c

@@ -419,8 +419,8 @@ int usb_gadget_unregister_driver(struct usb_gadget_driver *driver)
 }
 #endif /* CONFIG_USB_MUSB_GADGET */
 
-int musb_register(struct musb_hdrc_platform_data *plat, void *bdata,
+struct musb *musb_register(struct musb_hdrc_platform_data *plat, void *bdata,
-			void *ctl_regs)
+			   void *ctl_regs)
 {
 	struct musb **musbp;
 
@@ -436,14 +436,14 @@ int musb_register(struct musb_hdrc_platform_data *plat, void *bdata,
 		break;
 #endif
 	default:
-		return -EINVAL;
+		return ERR_PTR(-EINVAL);
 	}
 
 	*musbp = musb_init_controller(plat, (struct device *)bdata, ctl_regs);
-	if (!*musbp) {
+	if (IS_ERR(*musbp)) {
 		printf("Failed to init the controller\n");
-		return -EIO;
+		return ERR_CAST(*musbp);
 	}
 
-	return 0;
+	return *musbp;
 }

drivers/usb/musb-new/pic32.c

@@ -251,9 +251,11 @@ static int musb_usb_probe(struct udevice *dev)
 	ret = musb_lowlevel_init(mdata);
 #else
 	pic32_musb_plat.mode = MUSB_PERIPHERAL;
-	ret = musb_register(&pic32_musb_plat, &pdata->dev, mregs);
+	mdata->host = musb_register(&pic32_musb_plat, &pdata->dev, mregs);
+	if (!mdata->host)
+		return -EIO;
 #endif
-	if (ret == 0)
+	if ((ret == 0) && mdata->host)
 		printf("PIC32 MUSB OTG\n");
 
 	return ret;

drivers/usb/musb-new/sunxi.c

@@ -444,9 +444,11 @@ static int musb_usb_probe(struct udevice *dev)
 		printf("Allwinner mUSB OTG (Host)\n");
 #else
 	pdata.mode = MUSB_PERIPHERAL;
-	ret = musb_register(&pdata, &glue->dev, base);
+	host->host = musb_register(&pdata, &glue->dev, base);
-	if (!ret)
+	if (!host->host)
-		printf("Allwinner mUSB OTG (Peripheral)\n");
+		return -EIO;
+
+	printf("Allwinner mUSB OTG (Peripheral)\n");
 #endif
 
 	return ret;

include/linux/usb/musb.h

@@ -150,7 +150,7 @@ extern int tusb6010_platform_retime(unsigned is_refclk);
 /*
  * U-Boot specfic stuff
  */
-int musb_register(struct musb_hdrc_platform_data *plat, void *bdata,
+struct musb *musb_register(struct musb_hdrc_platform_data *plat, void *bdata,
-			void *ctl_regs);
+			   void *ctl_regs);
 
 #endif /* __LINUX_USB_MUSB_H */