linux-kernel - [PATCH v2 1/2] phy: tegra: xusb: Add API to retrieve the port number of phy

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Message-ID: <20240307030328.1487748-2-waynec@nvidia.com>
Date: Thu, 7 Mar 2024 11:03:27 +0800
From: Wayne Chang <waynec@...dia.com>
To: <waynec@...dia.com>, <jonathanh@...dia.com>, <thierry.reding@...il.com>,
	<jckuo@...dia.com>, <vkoul@...nel.org>, <kishon@...nel.org>,
	<gregkh@...uxfoundation.org>
CC: <linux-phy@...ts.infradead.org>, <linux-tegra@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, <linux-usb@...r.kernel.org>,
	<stable@...r.kernel.org>
Subject: [PATCH v2 1/2] phy: tegra: xusb: Add API to retrieve the port number of phy

This patch introduces a new API, tegra_xusb_padctl_get_port_number,
to the Tegra XUSB Pad Controller driver. This API is used to identify
the USB port that is associated with a given PHY.

The function takes a PHY pointer for either a USB2 PHY or USB3 PHY as input
and returns the corresponding port number. If the PHY pointer is invalid,
it returns -ENODEV.

Cc: stable@...r.kernel.org
Signed-off-by: Wayne Chang <waynec@...dia.com>
---
V1 -> V2:cc stable
 drivers/phy/tegra/xusb.c       | 13 +++++++++++++
 include/linux/phy/tegra/xusb.h |  1 +
 2 files changed, 14 insertions(+)

diff --git a/drivers/phy/tegra/xusb.c b/drivers/phy/tegra/xusb.c
index 142ebe0247cc..983a6e6173bd 100644
--- a/drivers/phy/tegra/xusb.c
+++ b/drivers/phy/tegra/xusb.c
@@ -1531,6 +1531,19 @@ int tegra_xusb_padctl_get_usb3_companion(struct tegra_xusb_padctl *padctl,
 }
 EXPORT_SYMBOL_GPL(tegra_xusb_padctl_get_usb3_companion);
 
+int tegra_xusb_padctl_get_port_number(struct phy *phy)
+{
+	struct tegra_xusb_lane *lane;
+
+	if (!phy)
+		return -ENODEV;
+
+	lane = phy_get_drvdata(phy);
+
+	return lane->index;
+}
+EXPORT_SYMBOL_GPL(tegra_xusb_padctl_get_port_number);
+
 MODULE_AUTHOR("Thierry Reding <treding@...dia.com>");
 MODULE_DESCRIPTION("Tegra XUSB Pad Controller driver");
 MODULE_LICENSE("GPL v2");
diff --git a/include/linux/phy/tegra/xusb.h b/include/linux/phy/tegra/xusb.h
index 70998e6dd6fd..6ca51e0080ec 100644
--- a/include/linux/phy/tegra/xusb.h
+++ b/include/linux/phy/tegra/xusb.h
@@ -26,6 +26,7 @@ void tegra_phy_xusb_utmi_pad_power_down(struct phy *phy);
 int tegra_phy_xusb_utmi_port_reset(struct phy *phy);
 int tegra_xusb_padctl_get_usb3_companion(struct tegra_xusb_padctl *padctl,
 					 unsigned int port);
+int tegra_xusb_padctl_get_port_number(struct phy *phy);
 int tegra_xusb_padctl_enable_phy_sleepwalk(struct tegra_xusb_padctl *padctl, struct phy *phy,
 					   enum usb_device_speed speed);
 int tegra_xusb_padctl_disable_phy_sleepwalk(struct tegra_xusb_padctl *padctl, struct phy *phy);
-- 
2.25.1