diff --git a/drivers/net/dsa/microchip/ksz_common.c b/drivers/net/dsa/microchip/ksz_common.c
index 1a9d6f83a023..81798a9fa671 100644
--- a/drivers/net/dsa/microchip/ksz_common.c
+++ b/drivers/net/dsa/microchip/ksz_common.c
@@ -1486,6 +1486,41 @@ const struct ksz_chip_data ksz_switch_chips[] = {
 		.gbit_capable	= {true, true, true, true, true, true, true},
 	},
 
+	[KSZ9897S] = {
+		.chip_id = KSZ9897S_CHIP_ID,
+		.dev_name = "KSZ9897S",
+		.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 = 2,
+		.num_tx_queues = 4,
+		.num_ipms = 8,
+		.ops = &ksz9477_dev_ops,
+		.switch_ops = &ksz9477_switch_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, false},
+		.supports_rmii	= {false, false, false, false,
+				   false, true, false},
+		.supports_rgmii = {false, false, false, false,
+				   false, true, false},
+		.internal_phy	= {true, true, true, true,
+				   true, false, false},
+		.gbit_capable	= {true, true, true, true, true, true, true},
+		.sgmii_port = 7,
+	},
+
 	[KSZ9893] = {
 		.chip_id = KSZ9893_CHIP_ID,
 		.dev_name = "KSZ9893",
@@ -3897,6 +3932,7 @@ int ksz_switch_register(struct ksz_device *dev)
 	struct device_node *ports;
 	phy_interface_t interface;
 	unsigned int port_num;
+	u32 lookup_chip_id;
 	int ret;
 	int i;
 
@@ -3933,7 +3969,30 @@ int ksz_switch_register(struct ksz_device *dev)
 	if (ret)
 		return ret;
 
-	info = ksz_lookup_info(dev->chip_id);
+	lookup_chip_id = dev->chip_id;
+
+	/* The KSZ9897S and the KSZ9897R report the same chip ID and differ
+	 * only in chip_data: only the S has the SGMII port 7, the R has a
+	 * second RGMII port instead. Bit 7 of the port 7 XMII control 0
+	 * register is read-only and tells them apart; it reads one on the S.
+	 * Compare the KSZ9897S data sheet DS00002394C section 5.2.4.1 with
+	 * the KSZ9897R data sheet DS00002330D section 5.2.3.1.
+	 *
+	 * Only the chip_data entry differs, so dev->chip_id keeps the shared
+	 * chip ID and nothing else has to know about the variant.
+	 */
+	if (dev->chip_id == KSZ9897_CHIP_ID) {
+		u8 val;
+
+		ret = ksz_read8(dev, KSZ9897_REG_PORT7_XMII_CTRL_0, &val);
+		if (ret)
+			return ret;
+
+		if (val & KSZ9897_PORT7_SGMII_SEL)
+			lookup_chip_id = KSZ9897S_CHIP_ID;
+	}
+
+	info = ksz_lookup_info(lookup_chip_id);
 	if (!info)
 		return -ENODEV;
 
diff --git a/drivers/net/dsa/microchip/ksz_common.h b/drivers/net/dsa/microchip/ksz_common.h
index cbe98494578c..0cff33df06a4 100644
--- a/drivers/net/dsa/microchip/ksz_common.h
+++ b/drivers/net/dsa/microchip/ksz_common.h
@@ -284,6 +284,7 @@ enum ksz_model {
 	KSZ9477,
 	KSZ9896,
 	KSZ9897,
+	KSZ9897S,
 	KSZ9893,
 	KSZ9563,
 	KSZ9567,
@@ -874,6 +875,10 @@ static inline bool ksz_is_sgmii_port(struct ksz_device *dev, int port)
 #define SKU_ID_KSZ8563			0x3c
 #define SKU_ID_KSZ9563			0x1c
 
+/* KSZ9897 specific register: port 7 XMII control 0 */
+#define KSZ9897_REG_PORT7_XMII_CTRL_0	0x7300
+#define KSZ9897_PORT7_SGMII_SEL		BIT(7)
+
 /* Driver set switch broadcast storm protection at 10% rate. */
 #define BROADCAST_STORM_PROT_RATE	10
 
diff --git a/include/linux/platform_data/microchip-ksz.h b/include/linux/platform_data/microchip-ksz.h
index 028781ad4059..fe8df1774289 100644
--- a/include/linux/platform_data/microchip-ksz.h
+++ b/include/linux/platform_data/microchip-ksz.h
@@ -34,6 +34,7 @@ enum ksz_chip_id {
 	KSZ9477_CHIP_ID = 0x00947700,
 	KSZ9896_CHIP_ID = 0x00989600,
 	KSZ9897_CHIP_ID = 0x00989700,
+	KSZ9897S_CHIP_ID = 0x00989701,
 	KSZ9893_CHIP_ID = 0x00989300,
 	KSZ9563_CHIP_ID = 0x00956300,
 	KSZ8567_CHIP_ID = 0x00856700,