usb: dwc3: Add support to reset usb ULPI phy
When usb PHY initialization is done, the PHY need to be reset.
Signed-off-by: T Karthik Reddy <t.karthik.reddy@xilinx.com>
Signed-off-by: Michal Simek <michal.simek@amd.com>
diff --git a/drivers/usb/dwc3/dwc3-generic.c b/drivers/usb/dwc3/dwc3-generic.c
index c5310e4..466b25a 100644
--- a/drivers/usb/dwc3/dwc3-generic.c
+++ b/drivers/usb/dwc3/dwc3-generic.c
@@ -26,6 +26,7 @@
#include <reset.h>
#include <clk.h>
#include <usb/xhci.h>
+#include <asm/gpio.h>
struct dwc3_glue_data {
struct clk_bulk clks;
@@ -43,6 +44,7 @@
void *base;
struct dwc3 dwc3;
struct phy_bulk phys;
+ struct gpio_desc ulpi_reset;
};
struct dwc3_generic_host_priv {
@@ -78,6 +80,27 @@
if (rc && rc != -ENOTSUPP)
return rc;
+ if (CONFIG_IS_ENABLED(DM_GPIO) &&
+ device_is_compatible(dev->parent, "xlnx,zynqmp-dwc3")) {
+ rc = gpio_request_by_name(dev->parent, "reset-gpios", 0,
+ &priv->ulpi_reset, GPIOD_ACTIVE_LOW);
+ if (rc)
+ return rc;
+
+ /* Toggle ulpi to reset the phy. */
+ rc = dm_gpio_set_value(&priv->ulpi_reset, 1);
+ if (rc)
+ return rc;
+
+ mdelay(5);
+
+ rc = dm_gpio_set_value(&priv->ulpi_reset, 0);
+ if (rc)
+ return rc;
+
+ mdelay(5);
+ }
+
if (device_is_compatible(dev->parent, "rockchip,rk3399-dwc3"))
reset_deassert_bulk(&glue->resets);
@@ -99,6 +122,13 @@
{
struct dwc3 *dwc3 = &priv->dwc3;
+ if (CONFIG_IS_ENABLED(DM_GPIO) &&
+ device_is_compatible(dev->parent, "xlnx,zynqmp-dwc3")) {
+ struct gpio_desc *ulpi_reset = &priv->ulpi_reset;
+
+ dm_gpio_free(ulpi_reset->dev, ulpi_reset);
+ }
+
dwc3_remove(dwc3);
dwc3_shutdown_phy(dev, &priv->phys);
unmap_physmem(dwc3->regs, MAP_NOCACHE);