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

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On 12/14/2021 1:33 AM, Rob Herring wrote:
On Thu, Dec 02, 2021 at 03:21:23PM +0530, Souradeep Chowdhury wrote:
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@xxxxxxxxxxx>
---
  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");
Connector nodes are named 'connector' or possibly 'usb-connector'. If
you are creating an ABI with the node name, it should be documented.
However, it's preferred to use 'compatible' for identifying nodes rather
than a node name.
Ack.
+	if (!np) {
+		dev_dbg(dev, "no usb_connector child node specified\n");
+		return 0;
+	}
+
+	ret = of_platform_populate(np, NULL, NULL, dev);
But why is any of this needed. The connector doesn't have a driver (I
expect eventually we will) and the EUD device is not a child.

Ack. This can be removed as we are no longer mapping EUD as a type C connector.


+	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





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