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path: root/drivers/usb/dwc3/dwc3-keystone.c
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Diffstat (limited to 'drivers/usb/dwc3/dwc3-keystone.c')
-rw-r--r--drivers/usb/dwc3/dwc3-keystone.c41
1 files changed, 40 insertions, 1 deletions
diff --git a/drivers/usb/dwc3/dwc3-keystone.c b/drivers/usb/dwc3/dwc3-keystone.c
index 1e14a6f4884b..6505f7bd69e2 100644
--- a/drivers/usb/dwc3/dwc3-keystone.c
+++ b/drivers/usb/dwc3/dwc3-keystone.c
@@ -14,6 +14,7 @@
#include <linux/dma-mapping.h>
#include <linux/io.h>
#include <linux/of_platform.h>
+#include <linux/phy/phy.h>
#include <linux/pm_runtime.h>
/* USBSS register offsets */
@@ -34,6 +35,7 @@
struct dwc3_keystone {
struct device *dev;
void __iomem *usbss;
+ struct phy *usb3_phy;
};
static inline u32 kdwc3_readl(void __iomem *base, u32 offset)
@@ -95,8 +97,38 @@ static int kdwc3_probe(struct platform_device *pdev)
if (IS_ERR(kdwc->usbss))
return PTR_ERR(kdwc->usbss);
- pm_runtime_enable(kdwc->dev);
+ /* PSC dependency on AM65 needs SERDES0 to be powered before USB0 */
+ kdwc->usb3_phy = devm_phy_optional_get(dev, "usb3-phy");
+ if (IS_ERR(kdwc->usb3_phy)) {
+ error = PTR_ERR(kdwc->usb3_phy);
+ if (error != -EPROBE_DEFER)
+ dev_err(dev, "couldn't get usb3 phy: %d\n", error);
+
+ return error;
+ }
+
+ phy_pm_runtime_get_sync(kdwc->usb3_phy);
+ error = phy_reset(kdwc->usb3_phy);
+ if (error < 0) {
+ dev_err(dev, "usb3 phy reset failed: %d\n", error);
+ return error;
+ }
+
+ error = phy_init(kdwc->usb3_phy);
+ if (error < 0) {
+ dev_err(dev, "usb3 phy init failed: %d\n", error);
+ return error;
+ }
+
+ error = phy_power_on(kdwc->usb3_phy);
+ if (error < 0) {
+ dev_err(dev, "usb3 phy power on failed: %d\n", error);
+ phy_exit(kdwc->usb3_phy);
+ return error;
+ }
+
+ pm_runtime_enable(kdwc->dev);
error = pm_runtime_get_sync(kdwc->dev);
if (error < 0) {
dev_err(kdwc->dev, "pm_runtime_get_sync failed, error %d\n",
@@ -138,6 +170,9 @@ err_core:
err_irq:
pm_runtime_put_sync(kdwc->dev);
pm_runtime_disable(kdwc->dev);
+ phy_power_off(kdwc->usb3_phy);
+ phy_exit(kdwc->usb3_phy);
+ phy_pm_runtime_put_sync(kdwc->usb3_phy);
return error;
}
@@ -163,6 +198,10 @@ static int kdwc3_remove(struct platform_device *pdev)
pm_runtime_put_sync(kdwc->dev);
pm_runtime_disable(kdwc->dev);
+ phy_power_off(kdwc->usb3_phy);
+ phy_exit(kdwc->usb3_phy);
+ phy_pm_runtime_put_sync(kdwc->usb3_phy);
+
platform_set_drvdata(pdev, NULL);
return 0;