From 5d58a890c02770ba8d790b1f3c6e8c0e20514dc2 Mon Sep 17 00:00:00 2001
From: "Russell King (Oracle)" <rmk+kernel@armlinux.org.uk>
Date: Tue, 3 Dec 2024 15:31:18 +0000
Subject: [PATCH 07/13] net: phy: add phy_config_inband()

Add a method to configure the PHY's in-band mode.

Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
Link: https://patch.msgid.link/E1tIUru-006IUI-08@rmk-PC.armlinux.org.uk
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
---
 drivers/net/phy/phy.c | 32 ++++++++++++++++++++++++++++++++
 include/linux/phy.h   |  6 ++++++
 2 files changed, 38 insertions(+)

--- a/drivers/net/phy/phy.c
+++ b/drivers/net/phy/phy.c
@@ -1070,6 +1070,38 @@ unsigned int phy_inband_caps(struct phy_
 EXPORT_SYMBOL_GPL(phy_inband_caps);
 
 /**
+ * phy_config_inband - configure the desired PHY in-band mode
+ * @phydev: the phy_device struct
+ * @modes: in-band modes to configure
+ *
+ * Description: disables, enables or enables-with-bypass in-band signalling
+ *   between the PHY and host system.
+ *
+ * Returns: zero on success, or negative errno value.
+ */
+int phy_config_inband(struct phy_device *phydev, unsigned int modes)
+{
+	int err;
+
+	if (!!(modes & LINK_INBAND_DISABLE) +
+	    !!(modes & LINK_INBAND_ENABLE) +
+	    !!(modes & LINK_INBAND_BYPASS) != 1)
+		return -EINVAL;
+
+	mutex_lock(&phydev->lock);
+	if (!phydev->drv)
+		err = -EIO;
+	else if (!phydev->drv->config_inband)
+		err = -EOPNOTSUPP;
+	else
+		err = phydev->drv->config_inband(phydev, modes);
+	mutex_unlock(&phydev->lock);
+
+	return err;
+}
+EXPORT_SYMBOL(phy_config_inband);
+
+/**
  * _phy_start_aneg - start auto-negotiation for this PHY device
  * @phydev: the phy_device struct
  *
--- a/include/linux/phy.h
+++ b/include/linux/phy.h
@@ -980,6 +980,11 @@ struct phy_driver {
 				    phy_interface_t interface);
 
 	/**
+	 * @config_inband: configure in-band mode for the PHY
+	 */
+	int (*config_inband)(struct phy_device *phydev, unsigned int modes);
+
+	/**
 	 * @get_rate_matching: Get the supported type of rate matching for a
 	 * particular phy interface. This is used by phy consumers to determine
 	 * whether to advertise lower-speed modes for that interface. It is
@@ -1860,6 +1865,7 @@ int phy_start_aneg(struct phy_device *ph
 int phy_aneg_done(struct phy_device *phydev);
 unsigned int phy_inband_caps(struct phy_device *phydev,
 			     phy_interface_t interface);
+int phy_config_inband(struct phy_device *phydev, unsigned int modes);
 int phy_speed_down(struct phy_device *phydev, bool sync);
 int phy_speed_up(struct phy_device *phydev);
 bool phy_check_valid(int speed, int duplex, unsigned long *features);
