phy: rockchip-inno-usb2: add support for otg-mux interrupt

The otg-id/otg-bvalid/linestate interrupts are multiplexed together
in otg-port on some Rockchip SoC (e.g RV1108), this patch add support
for it.
Signed-off-by: Frank Wang <frank.wang@rock-chips.com>
Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>

drivers/phy/rockchip/phy-rockchip-inno-usb2.c

@@ -172,6 +172,8 @@ struct rockchip_usb2phy_cfg {
  * @vbus_attached: otg device vbus status.
  * @bvalid_irq: IRQ number assigned for vbus valid rise detection.
  * @ls_irq: IRQ number assigned for linestate detection.
+ * @otg_mux_irq: IRQ number which multiplex otg-id/otg-bvalid/linestate
+ *		 irqs to one irq in otg-port.
  * @mutex: for register updating in sm_work.
  * @chg_work: charge detect work.
  * @otg_sm_work: OTG state machine work.
@@ -189,6 +191,7 @@ struct rockchip_usb2phy_port {
 	bool		vbus_attached;
 	int		bvalid_irq;
 	int		ls_irq;
+	int		otg_mux_irq;
 	struct mutex	mutex;
 	struct		delayed_work chg_work;
 	struct		delayed_work otg_sm_work;
@@ -934,6 +937,17 @@ static irqreturn_t rockchip_usb2phy_bvalid_irq(int irq, void *data)
 	return IRQ_HANDLED;
 }
 
+static irqreturn_t rockchip_usb2phy_otg_mux_irq(int irq, void *data)
+{
+	struct rockchip_usb2phy_port *rport = data;
+	struct rockchip_usb2phy *rphy = dev_get_drvdata(rport->phy->dev.parent);
+
+	if (property_enabled(rphy->grf, &rport->port_cfg->bvalid_det_st))
+		return rockchip_usb2phy_bvalid_irq(irq, data);
+	else
+		return IRQ_NONE;
+}
+
 static int rockchip_usb2phy_host_port_init(struct rockchip_usb2phy *rphy,
 					   struct rockchip_usb2phy_port *rport,
 					   struct device_node *child_np)
@@ -1010,6 +1024,25 @@ static int rockchip_usb2phy_otg_port_init(struct rockchip_usb2phy *rphy,
 	rport->utmi_avalid =
 		of_property_read_bool(child_np, "rockchip,utmi-avalid");
 
+	/*
+	 * Some SoCs use one interrupt with otg-id/otg-bvalid/linestate
+	 * interrupts muxed together, so probe the otg-mux interrupt first,
+	 * if not found, then look for the regular interrupts one by one.
+	 */
+	rport->otg_mux_irq = of_irq_get_byname(child_np, "otg-mux");
+	if (rport->otg_mux_irq > 0) {
+		ret = devm_request_threaded_irq(rphy->dev, rport->otg_mux_irq,
+						NULL,
+						rockchip_usb2phy_otg_mux_irq,
+						IRQF_ONESHOT,
+						"rockchip_usb2phy_otg",
+						rport);
+		if (ret) {
+			dev_err(rphy->dev,
+				"failed to request otg-mux irq handle\n");
+			goto out;
+		}
+	} else {
 		rport->bvalid_irq = of_irq_get_byname(child_np, "otg-bvalid");
 		if (rport->bvalid_irq < 0) {
 			dev_err(rphy->dev, "no vbus valid irq provided\n");
@@ -1017,14 +1050,18 @@ static int rockchip_usb2phy_otg_port_init(struct rockchip_usb2phy *rphy,
 			goto out;
 		}
 
-	ret = devm_request_threaded_irq(rphy->dev, rport->bvalid_irq, NULL,
+		ret = devm_request_threaded_irq(rphy->dev, rport->bvalid_irq,
+						NULL,
 						rockchip_usb2phy_bvalid_irq,
 						IRQF_ONESHOT,
-					"rockchip_usb2phy_bvalid", rport);
+						"rockchip_usb2phy_bvalid",
+						rport);
 		if (ret) {
-		dev_err(rphy->dev, "failed to request otg-bvalid irq handle\n");
+			dev_err(rphy->dev,
+				"failed to request otg-bvalid irq handle\n");
 			goto out;
 		}
+	}
 
 	if (!IS_ERR(rphy->edev)) {
 		rport->event_nb.notifier_call = rockchip_otg_event;