The LAN867x Rev.D0 PHY supports OATC10-compliant sleep and wake
functionality, which can be used for system suspend and wake-up via
MDI Wake-up Pulse (WUP).

Add suspend/resume handling and basic Wake-on-LAN support using
WAKE_PHY, enabling WUP as a wake source via the Sleep Control 0
register. The driver configures MDI wake before entering suspend
and reports/enables the wake source through ethtool WOL callbacks.

Also adjust the Rev.D0 configuration path to avoid checking the reset
completion status when resuming from suspend, as the reset status is
only valid after an explicit PHY reset and not after sleep.

This allows LAN867x Rev.D0 systems to reliably wake from suspend via
MDI activity while preserving correct initialization behavior.

Signed-off-by: Parthiban Veerasooran <parthiban.veerasooran@microchip.com>
---
 drivers/net/phy/microchip_t1s.c | 67 +++++++++++++++++++++++++++++++--
 1 file changed, 64 insertions(+), 3 deletions(-)

diff --git a/drivers/net/phy/microchip_t1s.c b/drivers/net/phy/microchip_t1s.c
index e601d56b2507..6b158ae5fb16 100644
--- a/drivers/net/phy/microchip_t1s.c
+++ b/drivers/net/phy/microchip_t1s.c
@@ -38,6 +38,10 @@
 #define LINK_STATUS_CONFIGURATION	GENMASK(12, 11)
 #define LINK_STATUS_SEMAPHORE		BIT(0)
 
+/* Sleep Control 0 Register */
+#define LAN867X_REG_SLEEP_CTRL0		0x0080
+#define SLEEP_CTRL0_MDI_WAKEUP_EN	BIT(14)
+
 /* Link Status Configuration */
 #define LINK_STATUS_CONFIG_PLCA_STATUS	0x1
 #define LINK_STATUS_CONFIG_SEMAPHORE	0x2
@@ -472,9 +476,14 @@ static int lan867x_revd0_config_init(struct phy_device *phydev)
 {
 	int ret;
 
-	ret = lan867x_check_reset_complete(phydev);
-	if (ret)
-		return ret;
+	/* Reset status is only valid after an explicit PHY reset, it is not set
+	 * when the PHY resumes from suspend/sleep state.
+	 */
+	if (!phydev->suspended) {
+		ret = lan867x_check_reset_complete(phydev);
+		if (ret)
+			return ret;
+	}
 
 	for (int i = 0; i < ARRAY_SIZE(lan867x_revd0_fixup_regs); i++) {
 		ret = phy_write_mmd(phydev, MDIO_MMD_VEND2,
@@ -491,6 +500,53 @@ static int lan867x_revd0_config_init(struct phy_device *phydev)
 	return lan867x_revd0_link_active_selection(phydev, false);
 }
 
+static int lan867x_revd0_suspend(struct phy_device *phydev)
+{
+	int ret;
+
+	/* Configure WUP as wake source for system suspend */
+	ret = phy_set_bits_mmd(phydev, MDIO_MMD_VEND2,
+			       LAN867X_REG_SLEEP_CTRL0,
+			       SLEEP_CTRL0_MDI_WAKEUP_EN);
+	if (ret)
+		return ret;
+
+	return genphy_c45_oatc10_suspend(phydev);
+}
+
+static int lan867x_revd0_set_wol(struct phy_device *phydev,
+				 struct ethtool_wolinfo *wol)
+{
+	/* Only support WAKE_PHY via WUP (Wake-up Pulse) */
+	if (wol->wolopts & ~WAKE_PHY)
+		return -EOPNOTSUPP;
+
+	if (wol->wolopts & WAKE_PHY) {
+		return phy_set_bits_mmd(phydev, MDIO_MMD_VEND2,
+					LAN867X_REG_SLEEP_CTRL0,
+					SLEEP_CTRL0_MDI_WAKEUP_EN);
+	} else {
+		/* Disable WUP wake source */
+		return phy_clear_bits_mmd(phydev, MDIO_MMD_VEND2,
+					  LAN867X_REG_SLEEP_CTRL0,
+					  SLEEP_CTRL0_MDI_WAKEUP_EN);
+	}
+}
+
+static void lan867x_revd0_get_wol(struct phy_device *phydev,
+				  struct ethtool_wolinfo *wol)
+{
+	int ret;
+
+	wol->supported = WAKE_PHY;
+	wol->wolopts = 0;
+
+	/* Check if WUP wake source is currently enabled */
+	ret = phy_read_mmd(phydev, MDIO_MMD_VEND2, LAN867X_REG_SLEEP_CTRL0);
+	if (ret >= 0 && (ret & SLEEP_CTRL0_MDI_WAKEUP_EN))
+		wol->wolopts = WAKE_PHY;
+}
+
 static int lan86xx_read_status(struct phy_device *phydev)
 {
 	/* The phy has some limitations, namely:
@@ -569,6 +625,7 @@ static struct phy_driver microchip_t1s_driver[] = {
 		PHY_ID_MATCH_EXACT(PHY_ID_LAN867X_REVD0),
 		.name               = "LAN867X Rev.D0",
 		.features           = PHY_BASIC_T1S_P2MP_FEATURES,
+		.flags              = PHY_ALWAYS_CALL_SUSPEND,
 		.config_init        = lan867x_revd0_config_init,
 		.get_plca_cfg	    = genphy_c45_plca_get_cfg,
 		.set_plca_cfg	    = lan86xx_plca_set_cfg,
@@ -577,6 +634,10 @@ static struct phy_driver microchip_t1s_driver[] = {
 		.cable_test_get_status = genphy_c45_oatc14_cable_test_get_status,
 		.get_sqi            = genphy_c45_oatc14_get_sqi,
 		.get_sqi_max        = genphy_c45_oatc14_get_sqi_max,
+		.suspend            = lan867x_revd0_suspend,
+		.resume             = genphy_c45_oatc10_resume,
+		.get_wol	    = lan867x_revd0_get_wol,
+		.set_wol	    = lan867x_revd0_set_wol,
 	},
 	{
 		PHY_ID_MATCH_EXACT(PHY_ID_LAN865X_REVB),
-- 
2.34.1