diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c
index 5b145f1aaa1b..87e385542576 100644
--- a/drivers/acpi/scan.c
+++ b/drivers/acpi/scan.c
@@ -1714,6 +1714,7 @@ static bool acpi_device_enumeration_by_parent(struct acpi_device *device)
 		{"BSG1160", },
 		{"BSG2150", },
 		{"CSC3551", },
+		{"CSC3556", },
 		{"INT33FE", },
 		{"INT3515", },
 		/* Non-conforming _HID for Cirrus Logic already released */
diff --git a/drivers/platform/x86/serial-multi-instantiate.c b/drivers/platform/x86/serial-multi-instantiate.c
index 2c2abf69f049..8158e3cf5d6d 100644
--- a/drivers/platform/x86/serial-multi-instantiate.c
+++ b/drivers/platform/x86/serial-multi-instantiate.c
@@ -329,6 +329,19 @@ static const struct smi_node cs35l41_hda = {
 	.bus_type = SMI_AUTO_DETECT,
 };
 
+static const struct smi_node cs35l56_hda = {
+	.instances = {
+		{ "cs35l56-hda", IRQ_RESOURCE_AUTO, 0 },
+		{ "cs35l56-hda", IRQ_RESOURCE_AUTO, 0 },
+		{ "cs35l56-hda", IRQ_RESOURCE_AUTO, 0 },
+		{ "cs35l56-hda", IRQ_RESOURCE_AUTO, 0 },
+		/* a 5th entry is an alias address, not a real device */
+		{ "cs35l56-hda_dummy_dev" },
+		{}
+	},
+	.bus_type = SMI_AUTO_DETECT,
+};
+
 /*
  * Note new device-ids must also be added to ignore_serial_bus_ids in
  * drivers/acpi/scan.c: acpi_device_enumeration_by_parent().
@@ -337,6 +350,7 @@ static const struct acpi_device_id smi_acpi_ids[] = {
 	{ "BSG1160", (unsigned long)&bsg1160_data },
 	{ "BSG2150", (unsigned long)&bsg2150_data },
 	{ "CSC3551", (unsigned long)&cs35l41_hda },
+	{ "CSC3556", (unsigned long)&cs35l56_hda },
 	{ "INT3515", (unsigned long)&int3515_data },
 	/* Non-conforming _HID for Cirrus Logic already released */
 	{ "CLSA0100", (unsigned long)&cs35l41_hda },