Subject: [net-next v3 3/3] net: phy: motorcomm: Add YT8522 100M RMII PHY support

From: Minda Chen <[email-masked]>
Date: Fri, 8 May 2026 17:45:22 +0800

Add YT8522 100M RMII ethernet PHY base driver support, including
PHY ID and base config init function.

Signed-off-by: Minda Chen <[email-masked]>
---
 drivers/net/phy/motorcomm.c | 49 ++++++++++++++++++++++++++++++++++++-
 1 file changed, 48 insertions(+), 1 deletion(-)

diff --git a/drivers/net/phy/motorcomm.c b/drivers/net/phy/motorcomm.c
index ebc24f51e626..13d57aba5487 100644
--- a/drivers/net/phy/motorcomm.c
+++ b/drivers/net/phy/motorcomm.c
@@ -1,6 +1,6 @@
 // SPDX-License-Identifier: GPL-2.0+
 /*
- * Motorcomm 8511/8521/8531/8531S/8821 PHY driver.
+ * Motorcomm 8511/8521/8522/8531/8531S/8821 PHY driver.
  *
  * Author: Peter Geis <[email-masked]>
  * Author: Frank <[email-masked]>
@@ -14,6 +14,7 @@
 
 #define PHY_ID_YT8511		0x0000010a
 #define PHY_ID_YT8521		0x0000011a
+#define PHY_ID_YT8522		0x4f51e928
 #define PHY_ID_YT8531		0x4f51e91b
 #define PHY_ID_YT8531S		0x4f51e91a
 #define PHY_ID_YT8821		0x4f51ea19
@@ -227,6 +228,13 @@
 #define YT8521_LED_100_ON_EN			BIT(5)
 #define YT8521_LED_10_ON_EN			BIT(4)
 
+#define YT8522_EXTREG_SLEEP_CONTROL		0x2027
+#define YT8522_EN_SLEEP_SW			15
+
+#define YT8522_EXTENDED_COMBO_CTRL		0x4000
+#define YT8522_RXDV_SEL				BIT(4)
+#define YT8522_RMII_EN				BIT(1)
+
 #define YTPHY_MISC_CONFIG_REG			0xA006
 #define YTPHY_MCR_FIBER_SPEED_MASK		BIT(0)
 #define YTPHY_MCR_FIBER_1000BX			(0x1 << 0)
@@ -1843,6 +1851,36 @@ static int yt8531_config_init(struct phy_device *phydev)
 	return 0;
 }
 
+static int yt8522_config_init(struct phy_device *phydev)
+{
+	struct device_node *node = phydev->mdio.dev.of_node;
+	int ret, val;
+
+	val = ytphy_read_ext_with_lock(phydev, YT8522_EXTENDED_COMBO_CTRL);
+	if (val < 0)
+		return val;
+
+	if (val & YT8522_RMII_EN) {
+		val |= YT8522_RXDV_SEL;
+		ret = ytphy_write_ext_with_lock(phydev,
+						YT8522_EXTENDED_COMBO_CTRL,
+						val);
+		if (ret < 0)
+			return ret;
+	}
+
+	if (of_property_read_bool(node, "motorcomm,auto-sleep-disabled")) {
+		/* disable auto sleep */
+		ret = ytphy_modify_ext_with_lock(phydev,
+						 YT8522_EXTREG_SLEEP_CONTROL,
+						 YT8522_EN_SLEEP_SW, 0);
+		if (ret < 0)
+			return ret;
+	}
+
+	return 0;
+}
+
 /**
  * yt8531_link_change_notify() - Adjust the tx clock direction according to
  * the current speed and dts config.
@@ -3052,6 +3090,14 @@ static struct phy_driver motorcomm_phy_drvs[] = {
 		.led_hw_control_set = yt8521_led_hw_control_set,
 		.led_hw_control_get = yt8521_led_hw_control_get,
 	},
+	{
+		PHY_ID_MATCH_EXACT(PHY_ID_YT8522),
+		.name		= "YT8522 100 Megabit Ethernet",
+		.config_aneg	= genphy_config_aneg,
+		.config_init	= yt8522_config_init,
+		.suspend	= genphy_suspend,
+		.resume		= genphy_resume,
+	},
 	{
 		PHY_ID_MATCH_EXACT(PHY_ID_YT8531),
 		.name		= "YT8531 Gigabit Ethernet",
@@ -3112,6 +3158,7 @@ MODULE_LICENSE("GPL");
 static const struct mdio_device_id __maybe_unused motorcomm_tbl[] = {
 	{ PHY_ID_MATCH_EXACT(PHY_ID_YT8511) },
 	{ PHY_ID_MATCH_EXACT(PHY_ID_YT8521) },
+	{ PHY_ID_MATCH_EXACT(PHY_ID_YT8522) },
 	{ PHY_ID_MATCH_EXACT(PHY_ID_YT8531) },
 	{ PHY_ID_MATCH_EXACT(PHY_ID_YT8531S) },
 	{ PHY_ID_MATCH_EXACT(PHY_ID_YT8821) },
-- 
2.17.1