[PATCH v4 3/5] usb: gadget: CDC ACM: call usb_gadget_initialize

[Caleb Connolly]

To actually use the gadget the peripheral driver must be probed and we
must call g_dnl_clear_detach(). Otherwise acm_stdio_start() will always
fail to find a UDC on DT platforms.

Reviewed-by: Mattijs Korpershoek <mkorpershoek at baylibre.com>
Reviewed-by: Neil Armstrong <neil.armstrong at linaro.org>
Signed-off-by: Caleb Connolly <caleb.connolly at linaro.org>
---
 drivers/usb/gadget/f_acm.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/drivers/usb/gadget/f_acm.c b/drivers/usb/gadget/f_acm.c
index de42e0189e8d..ba216128ab27 100644
--- a/drivers/usb/gadget/f_acm.c
+++ b/drivers/usb/gadget/f_acm.c
@@ -622,14 +622,23 @@ static void acm_stdio_puts(struct stdio_dev *dev, const char *str)
 }
 
 static int acm_stdio_start(struct stdio_dev *dev)
 {
+	struct udevice *udc;
 	int ret;
 
 	if (dev->priv) { /* function already exist */
 		return 0;
 	}
 
+	ret = udc_device_get_by_index(0, &udc);
+	if (ret) {
+		pr_err("USB init failed: %d\n", ret);
+		return ret;
+	}
+
+	g_dnl_clear_detach();
+
 	ret = g_dnl_register("usb_serial_acm");
 	if (ret)
 		return ret;
 

-- 
2.44.0