[net-next v1 3/3] net: phy: motorcomm: Add YT8522 100M RMII PHY support

Minda Chen
2026-04-15T09:42:43Z

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

Signed-off-by: Minda Chen <minda.chen@starfivetech.com>
---
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 f3129419f7c9..86396424b042 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 <pgwipeout@gmail.com>
* Author: Frank <Frank.Sae@motor-comm.com>
@@ -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)
@@ -1857,6 +1865,36 @@ 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.
@@ -3066,6 +3104,14 @@ 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",
@@ -3126,6 +3172,7 @@ 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