usb: phy: Use fallthrough pseudo-keyword

Replace the existing /* fall through */ comments and its variants with
the new pseudo-keyword macro fallthrough[1]. Also, remove unnecessary
fall-through markings when it is the case.

[1] https://www.kernel.org/doc/html/latest/process/deprecated.html?highlight=fallthrough#implicit-switch-case-fall-throughSigned-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>
Link: https://lore.kernel.org/r/20200707200040.GA4525@embeddedorSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/usb/phy/phy-ab8500-usb.c

@@ -331,7 +331,7 @@ static int ab8505_usb_link_status_update(struct ab8500_usb *ab,
 	switch (lsts) {
 	case USB_LINK_ACA_RID_B_8505:
 		event = UX500_MUSB_RIDB;
-		/* Fall through */
+		fallthrough;
 	case USB_LINK_NOT_CONFIGURED_8505:
 	case USB_LINK_RESERVED0_8505:
 	case USB_LINK_RESERVED1_8505:
@@ -352,7 +352,7 @@ static int ab8505_usb_link_status_update(struct ab8500_usb *ab,
 
 	case USB_LINK_ACA_RID_C_NM_8505:
 		event = UX500_MUSB_RIDC;
-		/* Fall through */
+		fallthrough;
 	case USB_LINK_STD_HOST_NC_8505:
 	case USB_LINK_STD_HOST_C_NS_8505:
 	case USB_LINK_STD_HOST_C_S_8505:
@@ -371,7 +371,7 @@ static int ab8505_usb_link_status_update(struct ab8500_usb *ab,
 	case USB_LINK_ACA_RID_A_8505:
 	case USB_LINK_ACA_DOCK_CHGR_8505:
 		event = UX500_MUSB_RIDA;
-		/* Fall through */
+		fallthrough;
 	case USB_LINK_HM_IDGND_8505:
 		if (ab->mode == USB_IDLE) {
 			ab->mode = USB_HOST;
@@ -444,7 +444,7 @@ static int ab8500_usb_link_status_update(struct ab8500_usb *ab,
 	switch (lsts) {
 	case USB_LINK_ACA_RID_B_8500:
 		event = UX500_MUSB_RIDB;
-		/* Fall through */
+		fallthrough;
 	case USB_LINK_NOT_CONFIGURED_8500:
 	case USB_LINK_NOT_VALID_LINK_8500:
 		ab->mode = USB_IDLE;
@@ -461,7 +461,7 @@ static int ab8500_usb_link_status_update(struct ab8500_usb *ab,
 	case USB_LINK_ACA_RID_C_HS_8500:
 	case USB_LINK_ACA_RID_C_HS_CHIRP_8500:
 		event = UX500_MUSB_RIDC;
-		/* Fall through */
+		fallthrough;
 	case USB_LINK_STD_HOST_NC_8500:
 	case USB_LINK_STD_HOST_C_NS_8500:
 	case USB_LINK_STD_HOST_C_S_8500:
@@ -481,7 +481,7 @@ static int ab8500_usb_link_status_update(struct ab8500_usb *ab,
 
 	case USB_LINK_ACA_RID_A_8500:
 		event = UX500_MUSB_RIDA;
-		/* Fall through */
+		fallthrough;
 	case USB_LINK_HM_IDGND_8500:
 		if (ab->mode == USB_IDLE) {
 			ab->mode = USB_HOST;

drivers/usb/phy/phy-fsl-usb.c

@@ -911,10 +911,10 @@ int usb_otg_start(struct platform_device *pdev)
 		break;
 	case FSL_USB2_PHY_UTMI_WIDE:
 		temp |= PORTSC_PTW_16BIT;
-		/* fall through */
+		fallthrough;
 	case FSL_USB2_PHY_UTMI:
 		temp |= PORTSC_PTS_UTMI;
-		/* fall through */
+		fallthrough;
 	default:
 		break;
 	}

drivers/usb/phy/phy-isp1301-omap.c

@@ -581,11 +581,11 @@ static void otg_update_isp(struct isp1301 *isp)
 		/* HNP failed for some reason (A_AIDL_BDIS timeout) */
 		notresponding(isp);
 
-		/* FALLTHROUGH */
+		fallthrough;
 	case OTG_STATE_A_VBUS_ERR:
 		isp->phy.otg->state = OTG_STATE_A_WAIT_VFALL;
 		pr_debug("  --> a_wait_vfall\n");
-		/* FALLTHROUGH */
+		fallthrough;
 	case OTG_STATE_A_WAIT_VFALL:
 		/* FIXME usbcore thinks port power is still on ... */
 		clr |= OTG1_VBUS_DRV;
@@ -595,7 +595,7 @@ static void otg_update_isp(struct isp1301 *isp)
 			isp->phy.otg->state = OTG_STATE_A_WAIT_VRISE;
 			pr_debug("  --> a_wait_vrise\n");
 		}
-		/* FALLTHROUGH */
+		fallthrough;
 	default:
 		toggle(OTG_DRV_VBUS, OTG1_VBUS_DRV);
 	}
@@ -945,10 +945,10 @@ static void isp_update_otg(struct isp1301 *isp, u8 stat)
 			switch (state) {
 			case OTG_STATE_B_IDLE:
 				a_idle(isp, "idle");
-				/* FALLTHROUGH */
+				fallthrough;
 			case OTG_STATE_A_IDLE:
 				enable_vbus_source(isp);
-				/* FALLTHROUGH */
+				fallthrough;
 			case OTG_STATE_A_WAIT_VRISE:
 				/* we skip over OTG_STATE_A_WAIT_BCON, since
 				 * the HC will transition to A_HOST (or
@@ -1032,12 +1032,12 @@ static void isp_update_otg(struct isp1301 *isp, u8 stat)
 						OTG1_DP_PULLUP);
 			dump_regs(isp, __func__);
 #endif
-			/* FALLTHROUGH */
+			fallthrough;
 		case OTG_STATE_B_SRP_INIT:
 			b_idle(isp, __func__);
 			l = omap_readl(OTG_CTRL) & OTG_XCEIV_OUTPUTS;
 			omap_writel(l, OTG_CTRL);
-			/* FALLTHROUGH */
+			fallthrough;
 		case OTG_STATE_B_IDLE:
 			if (otg->gadget && (isp_bstat & OTG_B_SESS_VLD)) {
 #ifdef	CONFIG_USB_OTG

drivers/usb/phy/phy-mv-usb.c

@@ -334,7 +334,7 @@ static void mv_otg_update_state(struct mv_otg *mvotg)
 	switch (old_state) {
 	case OTG_STATE_UNDEFINED:
 		mvotg->phy.otg->state = OTG_STATE_B_IDLE;
-		/* FALL THROUGH */
+		fallthrough;
 	case OTG_STATE_B_IDLE:
 		if (otg_ctrl->id == 0)
 			mvotg->phy.otg->state = OTG_STATE_A_IDLE;