[PATCH v3 2/2] usb: dwc3: Add support for usb3-phy PHY configuration

[Michal Simek]

When usb3-phy label is found, PHY driver is called and serdes line is
initialized. This is preparation for serdes/psgtr driver to configure GT
lines based on description in DT.

Signed-off-by: Michal Simek <michal.simek at xilinx.com>
---

Changes in v3:
- Add cover letter

Changes in v2:
- Add missing header

 drivers/usb/dwc3/dwc3-generic.c | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/drivers/usb/dwc3/dwc3-generic.c b/drivers/usb/dwc3/dwc3-generic.c
index 01bd0ca190e3..2c5205df62cd 100644
--- a/drivers/usb/dwc3/dwc3-generic.c
+++ b/drivers/usb/dwc3/dwc3-generic.c
@@ -14,6 +14,7 @@
 #include <dm/device-internal.h>
 #include <dm/lists.h>
 #include <dwc3-uboot.h>
+#include <generic-phy.h>
 #include <linux/bitops.h>
 #include <linux/delay.h>
 #include <linux/usb/ch9.h>
@@ -409,6 +410,17 @@ static int dwc3_glue_probe(struct udevice *dev)
 	struct udevice *child = NULL;
 	int index = 0;
 	int ret;
+	struct phy phy;
+
+	ret = generic_phy_get_by_name(dev, "usb3-phy", &phy);
+	if (!ret) {
+		ret = generic_phy_init(&phy);
+		if (ret)
+			return ret;
+	} else if (ret != -ENOENT) {
+		debug("could not get phy (err %d)\n", ret);
+		return ret;
+	}
 
 	glue->regs = dev_read_addr(dev);
 
@@ -420,6 +432,12 @@ static int dwc3_glue_probe(struct udevice *dev)
 	if (ret)
 		return ret;
 
+	if (phy.dev) {
+		ret = generic_phy_power_on(&phy);
+		if (ret)
+			return ret;
+	}
+
 	ret = device_find_first_child(dev, &child);
 	if (ret)
 		return ret;
-- 
2.35.1