diff --git a/drivers/net/dsa/microchip/ksz9477.c b/drivers/net/dsa/microchip/ksz9477.c
index 0ba658a72d8f..d16817e0476f 100644
--- a/drivers/net/dsa/microchip/ksz9477.c
+++ b/drivers/net/dsa/microchip/ksz9477.c
@@ -1131,6 +1131,10 @@ void ksz9477_config_cpu_port(struct dsa_switch *ds)
 		if (i == dev->cpu_port)
 			continue;
 		ksz_port_stp_state_set(ds, i, BR_STATE_DISABLED);
+
+		/* Power down the internal PHY if port is unused. */
+		if (dsa_is_unused_port(ds, i) && dev->info->internal_phy[i])
+			ksz_pwrite16(dev, i, 0x100, BMCR_PDOWN);
 	}
 }
 
diff --git a/drivers/net/dsa/microchip/ksz9477_i2c.c b/drivers/net/dsa/microchip/ksz9477_i2c.c
index 7d7560f23a73..1c6d7fc16772 100644
--- a/drivers/net/dsa/microchip/ksz9477_i2c.c
+++ b/drivers/net/dsa/microchip/ksz9477_i2c.c
@@ -2,7 +2,7 @@
 /*
  * Microchip KSZ9477 series register access through I2C
  *
- * Copyright (C) 2018-2019 Microchip Technology Inc.
+ * Copyright (C) 2018-2024 Microchip Technology Inc.
  */
 
 #include <linux/i2c.h>
@@ -16,6 +16,8 @@ KSZ_REGMAP_TABLE(ksz9477, not_used, 16, 0, 0);
 
 static int ksz9477_i2c_probe(struct i2c_client *i2c)
 {
+	const struct ksz_chip_data *chip;
+	struct device *ddev = &i2c->dev;
 	struct regmap_config rc;
 	struct ksz_device *dev;
 	int i, ret;
@@ -24,6 +26,12 @@ static int ksz9477_i2c_probe(struct i2c_client *i2c)
 	if (!dev)
 		return -ENOMEM;
 
+	chip = device_get_match_data(ddev);
+	if (!chip)
+		return -EINVAL;
+
+	/* Save chip id to do special initialization when probing. */
+	dev->chip_id = chip->chip_id;
 	for (i = 0; i < __KSZ_NUM_REGMAPS; i++) {
 		rc = ksz9477_regmap_config[i];
 		rc.lock_arg = &dev->regmap_mutex;
@@ -111,6 +119,10 @@ static const struct of_device_id ksz9477_dt_ids[] = {
 		.compatible = "microchip,ksz9567",
 		.data = &ksz_switch_chips[KSZ9567]
 	},
+	{
+		.compatible = "microchip,lan9646",
+		.data = &ksz_switch_chips[LAN9646]
+	},
 	{},
 };
 MODULE_DEVICE_TABLE(of, ksz9477_dt_ids);
diff --git a/drivers/net/dsa/microchip/ksz_common.c b/drivers/net/dsa/microchip/ksz_common.c
index f73833e24622..a557847fda11 100644
--- a/drivers/net/dsa/microchip/ksz_common.c
+++ b/drivers/net/dsa/microchip/ksz_common.c
@@ -1901,6 +1901,41 @@ const struct ksz_chip_data ksz_switch_chips[] = {
 		.internal_phy	= {true, true, true, true,
 				   false, false, true, true},
 	},
+
+	[LAN9646] = {
+		.chip_id = LAN9646_CHIP_ID,
+		.dev_name = "LAN9646",
+		.num_vlans = 4096,
+		.num_alus = 4096,
+		.num_statics = 16,
+		.cpu_ports = 0x7F,	/* can be configured as cpu port */
+		.port_cnt = 7,		/* total physical port count */
+		.port_nirqs = 4,
+		.num_tx_queues = 4,
+		.num_ipms = 8,
+		.ops = &ksz9477_dev_ops,
+		.phylink_mac_ops = &ksz9477_phylink_mac_ops,
+		.phy_errata_9477 = true,
+		.mib_names = ksz9477_mib_names,
+		.mib_cnt = ARRAY_SIZE(ksz9477_mib_names),
+		.reg_mib_cnt = MIB_COUNTER_NUM,
+		.regs = ksz9477_regs,
+		.masks = ksz9477_masks,
+		.shifts = ksz9477_shifts,
+		.xmii_ctrl0 = ksz9477_xmii_ctrl0,
+		.xmii_ctrl1 = ksz9477_xmii_ctrl1,
+		.supports_mii	= {false, false, false, false,
+				   false, true, true},
+		.supports_rmii	= {false, false, false, false,
+				   false, true, true},
+		.supports_rgmii = {false, false, false, false,
+				   false, true, true},
+		.internal_phy	= {true, true, true, true,
+				   true, false, false},
+		.gbit_capable	= {true, true, true, true, true, true, true},
+		.wr_table = &ksz9477_register_set,
+		.rd_table = &ksz9477_register_set,
+	},
 };
 EXPORT_SYMBOL_GPL(ksz_switch_chips);
 
@@ -2743,6 +2778,7 @@ static u32 ksz_get_phy_flags(struct dsa_switch *ds, int port)
 	case KSZ9896_CHIP_ID:
 		/* KSZ9896C Errata DS80000757A Module 3 */
 	case KSZ9897_CHIP_ID:
+	case LAN9646_CHIP_ID:
 		/* KSZ9897R Errata DS80000758C Module 4 */
 		/* Energy Efficient Ethernet (EEE) feature select must be manually disabled
 		 *   The EEE feature is enabled by default, but it is not fully
@@ -3003,6 +3039,7 @@ static void ksz_port_teardown(struct dsa_switch *ds, int port)
 	case KSZ9893_CHIP_ID:
 	case KSZ9896_CHIP_ID:
 	case KSZ9897_CHIP_ID:
+	case LAN9646_CHIP_ID:
 		if (dsa_is_user_port(ds, port))
 			ksz9477_port_acl_free(dev, port);
 	}
@@ -3059,7 +3096,8 @@ static enum dsa_tag_protocol ksz_get_tag_protocol(struct dsa_switch *ds,
 	    dev->chip_id == KSZ9477_CHIP_ID ||
 	    dev->chip_id == KSZ9896_CHIP_ID ||
 	    dev->chip_id == KSZ9897_CHIP_ID ||
-	    dev->chip_id == KSZ9567_CHIP_ID)
+	    dev->chip_id == KSZ9567_CHIP_ID ||
+	    dev->chip_id == LAN9646_CHIP_ID)
 		proto = DSA_TAG_PROTO_KSZ9477;
 
 	if (is_lan937x(dev))
@@ -3178,6 +3216,7 @@ static int ksz_max_mtu(struct dsa_switch *ds, int port)
 	case LAN9372_CHIP_ID:
 	case LAN9373_CHIP_ID:
 	case LAN9374_CHIP_ID:
+	case LAN9646_CHIP_ID:
 		return KSZ9477_MAX_FRAME_SIZE - VLAN_ETH_HLEN - ETH_FCS_LEN;
 	}
 
@@ -3200,6 +3239,7 @@ static int ksz_validate_eee(struct dsa_switch *ds, int port)
 	case KSZ9893_CHIP_ID:
 	case KSZ9896_CHIP_ID:
 	case KSZ9897_CHIP_ID:
+	case LAN9646_CHIP_ID:
 		return 0;
 	}
 
@@ -3552,7 +3592,10 @@ static int ksz_switch_detect(struct ksz_device *dev)
 		case LAN9372_CHIP_ID:
 		case LAN9373_CHIP_ID:
 		case LAN9374_CHIP_ID:
-			dev->chip_id = id32;
+
+			/* LAN9646 does not have its own chip id. */
+			if (dev->chip_id != LAN9646_CHIP_ID)
+				dev->chip_id = id32;
 			break;
 		case KSZ9893_CHIP_ID:
 			ret = ksz_read8(dev, REG_CHIP_ID4,
@@ -3591,6 +3634,7 @@ static int ksz_cls_flower_add(struct dsa_switch *ds, int port,
 	case KSZ9893_CHIP_ID:
 	case KSZ9896_CHIP_ID:
 	case KSZ9897_CHIP_ID:
+	case LAN9646_CHIP_ID:
 		return ksz9477_cls_flower_add(ds, port, cls, ingress);
 	}
 
@@ -3611,6 +3655,7 @@ static int ksz_cls_flower_del(struct dsa_switch *ds, int port,
 	case KSZ9893_CHIP_ID:
 	case KSZ9896_CHIP_ID:
 	case KSZ9897_CHIP_ID:
+	case LAN9646_CHIP_ID:
 		return ksz9477_cls_flower_del(ds, port, cls, ingress);
 	}
 
@@ -4698,6 +4743,7 @@ static int ksz_parse_drive_strength(struct ksz_device *dev)
 	case KSZ9893_CHIP_ID:
 	case KSZ9896_CHIP_ID:
 	case KSZ9897_CHIP_ID:
+	case LAN9646_CHIP_ID:
 		return ksz9477_drive_strength_write(dev, of_props,
 						    ARRAY_SIZE(of_props));
 	default:
diff --git a/drivers/net/dsa/microchip/ksz_common.h b/drivers/net/dsa/microchip/ksz_common.h
index bec846e20682..719bf2f8a524 100644
--- a/drivers/net/dsa/microchip/ksz_common.h
+++ b/drivers/net/dsa/microchip/ksz_common.h
@@ -214,6 +214,7 @@ enum ksz_model {
 	LAN9372,
 	LAN9373,
 	LAN9374,
+	LAN9646,
 };
 
 enum ksz_regs {
diff --git a/drivers/net/dsa/microchip/ksz_spi.c b/drivers/net/dsa/microchip/ksz_spi.c
index 1c6652f2b9fe..108a958dc356 100644
--- a/drivers/net/dsa/microchip/ksz_spi.c
+++ b/drivers/net/dsa/microchip/ksz_spi.c
@@ -54,6 +54,8 @@ static int ksz_spi_probe(struct spi_device *spi)
 	if (!chip)
 		return -EINVAL;
 
+	/* Save chip id to do special initialization when probing. */
+	dev->chip_id = chip->chip_id;
 	if (chip->chip_id == KSZ88X3_CHIP_ID)
 		regmap_config = ksz8863_regmap_config;
 	else if (chip->chip_id == KSZ8795_CHIP_ID ||
@@ -203,6 +205,10 @@ static const struct of_device_id ksz_dt_ids[] = {
 		.compatible = "microchip,lan9374",
 		.data = &ksz_switch_chips[LAN9374]
 	},
+	{
+		.compatible = "microchip,lan9646",
+		.data = &ksz_switch_chips[LAN9646]
+	},
 	{},
 };
 MODULE_DEVICE_TABLE(of, ksz_dt_ids);
@@ -228,6 +234,7 @@ static const struct spi_device_id ksz_spi_ids[] = {
 	{ "lan9372" },
 	{ "lan9373" },
 	{ "lan9374" },
+	{ "lan9646" },
 	{ },
 };
 MODULE_DEVICE_TABLE(spi, ksz_spi_ids);
diff --git a/include/linux/platform_data/microchip-ksz.h b/include/linux/platform_data/microchip-ksz.h
index 2ee1a679e592..0e0e8fe6975f 100644
--- a/include/linux/platform_data/microchip-ksz.h
+++ b/include/linux/platform_data/microchip-ksz.h
@@ -42,6 +42,7 @@ enum ksz_chip_id {
 	LAN9372_CHIP_ID = 0x00937200,
 	LAN9373_CHIP_ID = 0x00937300,
 	LAN9374_CHIP_ID = 0x00937400,
+	LAN9646_CHIP_ID = 0x00964600,
 };
 
 struct ksz_platform_data {
