linux-kernel - [PATCH V2 4/8] usb: dwc3: drd: Register the eud connector child node for dwc3

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Date:   Thu, 2 Dec 2021 15:21:23 +0530
From:   Souradeep Chowdhury <quic_schowdhu@...cinc.com>
To:     <linux-arm-msm@...r.kernel.org>, <linux-usb@...r.kernel.org>,
        <devicetree@...r.kernel.org>, <pure.logic@...us-software.ie>,
        <bjorn.andersson@...aro.org>, <greg@...ah.com>, <robh@...nel.org>
CC:     <linux-kernel@...r.kernel.org>, <quic_tsoni@...cinc.com>,
        <quic_psodagud@...cinc.com>, <quic_satyap@...cinc.com>,
        <quic_pheragu@...cinc.com>, <quic_rjendra@...cinc.com>,
        <quic_sibis@...cinc.com>, <quic_saipraka@...cinc.com>,
        Souradeep Chowdhury <quic_schowdhu@...cinc.com>
Subject: [PATCH V2 4/8] usb: dwc3: drd: Register the eud connector child node for dwc3

Register the child node for dwc3 which is the "eud_usb_connector".
The eud driver will be able to switch the usb role from device to
host and vice versa using the role switch property of dwc3 node.

Signed-off-by: Souradeep Chowdhury <quic_schowdhu@...cinc.com>
---
 drivers/usb/dwc3/drd.c | 26 ++++++++++++++++++++++++++
 1 file changed, 26 insertions(+)

diff --git a/drivers/usb/dwc3/drd.c b/drivers/usb/dwc3/drd.c
index d7f7683..b4ea55c 100644
--- a/drivers/usb/dwc3/drd.c
+++ b/drivers/usb/dwc3/drd.c
@@ -8,6 +8,7 @@
  */
 
 #include <linux/extcon.h>
+#include <linux/of_platform.h>
 #include <linux/of_graph.h>
 #include <linux/platform_device.h>
 #include <linux/property.h>
@@ -164,6 +165,27 @@ static int dwc3_otg_get_irq(struct dwc3 *dwc)
 	return irq;
 }
 
+static int dwc3_register_eud(struct dwc3 *dwc)
+{
+	struct device		*dev = dwc->dev;
+	struct device_node	*np = dev->of_node;
+	int                     ret;
+
+	of_get_child_by_name(np, "eud_usb_connector");
+	if (!np) {
+		dev_dbg(dev, "no usb_connector child node specified\n");
+		return 0;
+	}
+
+	ret = of_platform_populate(np, NULL, NULL, dev);
+	if (ret) {
+		dev_err(dev, "failed to register usb_connector - %d\n", ret);
+		return ret;
+	}
+
+	return 0;
+}
+
 void dwc3_otg_init(struct dwc3 *dwc)
 {
 	u32 reg;
@@ -580,6 +602,10 @@ int dwc3_drd_init(struct dwc3 *dwc)
 		ret = dwc3_setup_role_switch(dwc);
 		if (ret < 0)
 			return ret;
+
+		ret = dwc3_register_eud(dwc);
+		if (ret < 0)
+			return ret;
 	} else if (dwc->edev) {
 		dwc->edev_nb.notifier_call = dwc3_drd_notifier;
 		ret = extcon_register_notifier(dwc->edev, EXTCON_USB_HOST,
-- 
2.7.4