phy: core: add notify_connect and notify_disconnect callback

In Realtek SoC, the parameter of usb phy is designed to be able to
do dynamic tuning based in the port status. Therefore, add a notify
callback of phy driver when usb connection/disconnection change.

Signed-off-by: Stanley Chang <stanley_chang@realtek.com>
Link: https://lore.kernel.org/r/20231213031203.4911-1-stanley_chang@realtek.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 47 insertions, 0 deletions

diff --git a/drivers/phy/phy-core.c b/drivers/phy/phy-core.c
index d9be6a4d5383..2e8b07eb637a 100644
--- a/drivers/phy/phy-core.c
+++ b/drivers/phy/phy-core.c
@@ -490,6 +490,53 @@ int phy_calibrate(struct phy *phy)
 EXPORT_SYMBOL_GPL(phy_calibrate);
 
 /**
+ * phy_notify_connect() - phy connect notification
+ * @phy: the phy returned by phy_get()
+ * @port: the port index for connect
+ *
+ * If the phy needs to get connection status, the callback can be used.
+ * Returns: %0 if successful, a negative error code otherwise
+ */
+int phy_notify_connect(struct phy *phy, int port)
+{
+	int ret;
+
+	if (!phy || !phy->ops->connect)
+		return 0;
+
+	mutex_lock(&phy->mutex);
+	ret = phy->ops->connect(phy, port);
+	mutex_unlock(&phy->mutex);
+
+	return ret;
+}
+EXPORT_SYMBOL_GPL(phy_notify_connect);
+
+/**
+ * phy_notify_disconnect() - phy disconnect notification
+ * @phy: the phy returned by phy_get()
+ * @port: the port index for disconnect
+ *
+ * If the phy needs to get connection status, the callback can be used.
+ *
+ * Returns: %0 if successful, a negative error code otherwise
+ */
+int phy_notify_disconnect(struct phy *phy, int port)
+{
+	int ret;
+
+	if (!phy || !phy->ops->disconnect)
+		return 0;
+
+	mutex_lock(&phy->mutex);
+	ret = phy->ops->disconnect(phy, port);
+	mutex_unlock(&phy->mutex);
+
+	return ret;
+}
+EXPORT_SYMBOL_GPL(phy_notify_disconnect);
+
+/**
  * phy_configure() - Changes the phy parameters
  * @phy: the phy returned by phy_get()
  * @opts: New configuration to apply