linux-kernel - [PATCH v3 RESEND 1/4] phy: core: add notify_connect and notify

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Message-ID: <20231207074022.14116-1-stanley_chang@realtek.com>
Date:   Thu, 7 Dec 2023 15:38:04 +0800
From:   Stanley Chang <stanley_chang@...ltek.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
CC:     Stanley Chang <stanley_chang@...ltek.com>,
        Vinod Koul <vkoul@...nel.org>, Johan Hovold <johan@...nel.org>,
        Kishon Vijay Abraham I <kishon@...nel.org>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Jinjie Ruan <ruanjinjie@...wei.com>,
        Rob Herring <robh@...nel.org>,
        Alan Stern <stern@...land.harvard.edu>,
        Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
        Flavio Suligoi <f.suligoi@...m.it>,
        Ricardo Cañuelo <ricardo.canuelo@...labora.com>,
        <linux-kernel@...r.kernel.org>, <linux-phy@...ts.infradead.org>,
        <linux-usb@...r.kernel.org>
Subject: [PATCH v3 RESEND 1/4] phy: core: add notify_connect and notify_disconnect callback

In Realtek SoC, the parameter of usb phy is designed to can dynamic
tuning base on port status. Therefore, add a notify callback of phy
driver when usb connection/disconnection change.

Signed-off-by: Stanley Chang <stanley_chang@...ltek.com>
---
RESEND:
    Because there is no extcon device provided in the USB framework to
    notify connect and disconnect.
    Therefore, I added the notification connection/disconnection based
    on the generic phy. So I no use the EXTCON framework for notifying
    connect/disconnect.
v2 to v3:
    No change
v1 to v2:
    No change
---
 drivers/phy/phy-core.c  | 47 +++++++++++++++++++++++++++++++++++++++++
 include/linux/phy/phy.h | 18 ++++++++++++++++
 2 files changed, 65 insertions(+)

diff --git a/drivers/phy/phy-core.c b/drivers/phy/phy-core.c
index 96a0b1e111f3..a84ad4896b7f 100644
--- a/drivers/phy/phy-core.c
+++ b/drivers/phy/phy-core.c
@@ -489,6 +489,53 @@ int phy_calibrate(struct phy *phy)
 }
 EXPORT_SYMBOL_GPL(phy_calibrate);
 
+/**
+ * phy_notify_connect() - phy connect notify
+ * @phy: the phy returned by phy_get()
+ * @port: the port index for connect
+ *
+ * If phy need the 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 notify
+ * @phy: the phy returned by phy_get()
+ * @port: the port index for disconnect
+ *
+ * If phy need the get disconnection 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()
diff --git a/include/linux/phy/phy.h b/include/linux/phy/phy.h
index f6d607ef0e80..cf98cb29ddaa 100644
--- a/include/linux/phy/phy.h
+++ b/include/linux/phy/phy.h
@@ -122,6 +122,8 @@ struct phy_ops {
 			    union phy_configure_opts *opts);
 	int	(*reset)(struct phy *phy);
 	int	(*calibrate)(struct phy *phy);
+	int	(*connect)(struct phy *phy, int port);
+	int	(*disconnect)(struct phy *phy, int port);
 	void	(*release)(struct phy *phy);
 	struct module *owner;
 };
@@ -243,6 +245,8 @@ static inline enum phy_mode phy_get_mode(struct phy *phy)
 }
 int phy_reset(struct phy *phy);
 int phy_calibrate(struct phy *phy);
+int phy_notify_connect(struct phy *phy, int port);
+int phy_notify_disconnect(struct phy *phy, int port);
 static inline int phy_get_bus_width(struct phy *phy)
 {
 	return phy->attrs.bus_width;
@@ -396,6 +400,20 @@ static inline int phy_calibrate(struct phy *phy)
 	return -ENOSYS;
 }
 
+static inline int phy_notify_connect(struct phy *phy, int index)
+{
+	if (!phy)
+		return 0;
+	return -ENOSYS;
+}
+
+static inline int phy_notify_disconnect(struct phy *phy, int index)
+{
+	if (!phy)
+		return 0;
+	return -ENOSYS;
+}
+
 static inline int phy_configure(struct phy *phy,
 				union phy_configure_opts *opts)
 {
-- 
2.34.1