usb: dwc3: Add support for usb3-phy PHY configuration

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@xilinx.com>

diff --git a/drivers/usb/dwc3/dwc3-generic.c b/drivers/usb/dwc3/dwc3-generic.c
index 01bd0ca..2c5205d 100644 (file)
--- 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;