phy: Introduce to_usbphy conversion function

The generic phy support layer has the necessary list handling
and phy retrieval functions, so we should reuse them for usb
phys. This adds a phy_to_usbphy() conversion function which
drivers can implement which attach to the generic phy layer
and are really usb phys.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

1 files changed, 12 insertions, 0 deletions

diff --git a/drivers/phy/phy-core.c b/drivers/phy/phy-core.c
index 7c1f3d440b..1b6a9f7b1d 100644
--- a/drivers/phy/phy-core.c
+++ b/drivers/phy/phy-core.c
@@ -15,6 +15,7 @@
 #include <common.h>
 #include <malloc.h>
 #include <linux/phy/phy.h>
+#include <usb/phy.h>
 
 static LIST_HEAD(phy_provider_list);
 static int phy_ida;
@@ -201,6 +202,17 @@ int phy_power_off(struct phy *phy)
 	return 0;
 }
 
+struct usb_phy *phy_to_usbphy(struct phy *phy)
+{
+	if (!phy)
+		return NULL;
+
+	if (!phy->ops->to_usbphy)
+		return ERR_PTR(-EINVAL);
+
+	return phy->ops->to_usbphy(phy);
+}
+
 static struct phy_provider *of_phy_provider_lookup(struct device_node *node)
 {
 	struct phy_provider *phy_provider;