diff --git a/src/soc/intel/alderlake/fsp_params.c b/src/soc/intel/alderlake/fsp_params.c
index 8664fe6..22329f2 100644
--- a/src/soc/intel/alderlake/fsp_params.c
+++ b/src/soc/intel/alderlake/fsp_params.c
@@ -67,22 +67,6 @@
 		params->SerialIoUartMode[i] = config->SerialIoUartMode[i];
 }
 
-static const pci_devfn_t serial_io_dev[] = {
-	PCH_DEVFN_I2C0,
-	PCH_DEVFN_I2C1,
-	PCH_DEVFN_I2C2,
-	PCH_DEVFN_I2C3,
-	PCH_DEVFN_I2C4,
-	PCH_DEVFN_I2C5,
-	PCH_DEVFN_GSPI0,
-	PCH_DEVFN_GSPI1,
-	PCH_DEVFN_GSPI2,
-	PCH_DEVFN_GSPI3,
-	PCH_DEVFN_UART0,
-	PCH_DEVFN_UART1,
-	PCH_DEVFN_UART2
-};
-
 __weak void mainboard_update_soc_chip_config(struct soc_intel_alderlake_config *config)
 {
 	/* Override settings per board. */
@@ -334,10 +318,3 @@
 {
 	printk(BIOS_DEBUG, "WEAK: %s/%s called\n", __FILE__, __func__);
 }
-
-/* Return list of SOC LPSS controllers */
-const pci_devfn_t *soc_lpss_controllers_list(size_t *size)
-{
-	*size = ARRAY_SIZE(serial_io_dev);
-	return serial_io_dev;
-}
diff --git a/src/soc/intel/cannonlake/fsp_params.c b/src/soc/intel/cannonlake/fsp_params.c
index d7772f1..49b2669 100644
--- a/src/soc/intel/cannonlake/fsp_params.c
+++ b/src/soc/intel/cannonlake/fsp_params.c
@@ -572,13 +572,6 @@
 	printk(BIOS_DEBUG, "WEAK: %s/%s called\n", __FILE__, __func__);
 }
 
-/* Return list of SOC LPSS controllers */
-const pci_devfn_t *soc_lpss_controllers_list(size_t *size)
-{
-	*size = ARRAY_SIZE(serial_io_dev);
-	return serial_io_dev;
-}
-
 /* Handle FSP logo params */
 void soc_load_logo(FSPS_UPD *supd)
 {
diff --git a/src/soc/intel/common/block/include/intelblocks/lpss.h b/src/soc/intel/common/block/include/intelblocks/lpss.h
index 8d22e7a..5cfd5c5 100644
--- a/src/soc/intel/common/block/include/intelblocks/lpss.h
+++ b/src/soc/intel/common/block/include/intelblocks/lpss.h
@@ -27,13 +27,4 @@
 /* Set controller power state to D0 or D3*/
 void lpss_set_power_state(pci_devfn_t devfn, enum lpss_pwr_state state);
 
-/*
- * Handler to get list of LPSS controllers. The SOC is expected to send out a
- * list of pci devfn for all LPSS controllers supported by the SOC.
- */
-const pci_devfn_t *soc_lpss_controllers_list(size_t *size);
-
-/* Check if the device is a LPSS controller */
-bool is_dev_lpss(const struct device *dev);
-
 #endif	/* SOC_INTEL_COMMON_BLOCK_LPSS_H */
diff --git a/src/soc/intel/common/block/lpss/lpss.c b/src/soc/intel/common/block/lpss/lpss.c
index 6e33c0f..70a5934 100644
--- a/src/soc/intel/common/block/lpss/lpss.c
+++ b/src/soc/intel/common/block/lpss/lpss.c
@@ -72,21 +72,3 @@
 	reg8 |= state;
 	pci_s_write_config8(devfn, PME_CTRL_STATUS, reg8);
 }
-
-bool is_dev_lpss(const struct device *dev)
-{
-	static size_t size;
-	static const pci_devfn_t *lpss_devices;
-
-	if (dev->path.type != DEVICE_PATH_PCI)
-		return false;
-
-	if (!lpss_devices)
-		lpss_devices = soc_lpss_controllers_list(&size);
-
-	for (int i = 0; i < size; i++) {
-		if (lpss_devices[i] == dev->path.pci.devfn)
-			return true;
-	}
-	return false;
-}
diff --git a/src/soc/intel/elkhartlake/fsp_params.c b/src/soc/intel/elkhartlake/fsp_params.c
index f02d20e..611d12b 100644
--- a/src/soc/intel/elkhartlake/fsp_params.c
+++ b/src/soc/intel/elkhartlake/fsp_params.c
@@ -41,23 +41,6 @@
 	return ctl - 1;
 }
 
-static const pci_devfn_t serial_io_dev[] = {
-	PCH_DEVFN_I2C0,
-	PCH_DEVFN_I2C1,
-	PCH_DEVFN_I2C2,
-	PCH_DEVFN_I2C3,
-	PCH_DEVFN_I2C4,
-	PCH_DEVFN_I2C5,
-	PCH_DEVFN_I2C6,
-	PCH_DEVFN_I2C7,
-	PCH_DEVFN_GSPI0,
-	PCH_DEVFN_GSPI1,
-	PCH_DEVFN_GSPI2,
-	PCH_DEVFN_UART0,
-	PCH_DEVFN_UART1,
-	PCH_DEVFN_UART2
-};
-
 static void parse_devicetree(FSP_S_CONFIG *params)
 {
 	const struct soc_intel_elkhartlake_config *config = config_of_soc();
@@ -287,10 +270,3 @@
 {
 	printk(BIOS_DEBUG, "WEAK: %s/%s called\n", __FILE__, __func__);
 }
-
-/* Return list of SOC LPSS controllers */
-const pci_devfn_t *soc_lpss_controllers_list(size_t *size)
-{
-	*size = ARRAY_SIZE(serial_io_dev);
-	return serial_io_dev;
-}
diff --git a/src/soc/intel/icelake/fsp_params.c b/src/soc/intel/icelake/fsp_params.c
index 184b9d6..395bca8 100644
--- a/src/soc/intel/icelake/fsp_params.c
+++ b/src/soc/intel/icelake/fsp_params.c
@@ -33,21 +33,6 @@
 		params->SerialIoUartMode[i] = config->SerialIoUartMode[i];
 }
 
-static const pci_devfn_t serial_io_dev[] = {
-	PCH_DEVFN_I2C0,
-	PCH_DEVFN_I2C1,
-	PCH_DEVFN_I2C2,
-	PCH_DEVFN_I2C3,
-	PCH_DEVFN_I2C4,
-	PCH_DEVFN_I2C5,
-	PCH_DEVFN_GSPI0,
-	PCH_DEVFN_GSPI1,
-	PCH_DEVFN_GSPI2,
-	PCH_DEVFN_UART0,
-	PCH_DEVFN_UART1,
-	PCH_DEVFN_UART2
-};
-
 /* UPD parameters to be initialized before SiliconInit */
 void platform_fsp_silicon_init_params_cb(FSPS_UPD *supd)
 {
@@ -223,10 +208,3 @@
 {
 	printk(BIOS_DEBUG, "WEAK: %s/%s called\n", __FILE__, __func__);
 }
-
-/* Return list of SOC LPSS controllers */
-const pci_devfn_t *soc_lpss_controllers_list(size_t *size)
-{
-	*size = ARRAY_SIZE(serial_io_dev);
-	return serial_io_dev;
-}
diff --git a/src/soc/intel/jasperlake/fsp_params.c b/src/soc/intel/jasperlake/fsp_params.c
index eefbf6c..dcee306 100644
--- a/src/soc/intel/jasperlake/fsp_params.c
+++ b/src/soc/intel/jasperlake/fsp_params.c
@@ -28,21 +28,6 @@
 	EOP_DXE,
 } EndOfPost;
 
-static const pci_devfn_t serial_io_dev[] = {
-	PCH_DEVFN_I2C0,
-	PCH_DEVFN_I2C1,
-	PCH_DEVFN_I2C2,
-	PCH_DEVFN_I2C3,
-	PCH_DEVFN_I2C4,
-	PCH_DEVFN_I2C5,
-	PCH_DEVFN_GSPI0,
-	PCH_DEVFN_GSPI1,
-	PCH_DEVFN_GSPI2,
-	PCH_DEVFN_UART0,
-	PCH_DEVFN_UART1,
-	PCH_DEVFN_UART2
-};
-
 static void parse_devicetree(FSP_S_CONFIG *params)
 {
 	const struct soc_intel_jasperlake_config *config = config_of_soc();
@@ -266,10 +251,3 @@
 {
 	printk(BIOS_DEBUG, "WEAK: %s/%s called\n", __FILE__, __func__);
 }
-
-/* Return list of SOC LPSS controllers */
-const pci_devfn_t *soc_lpss_controllers_list(size_t *size)
-{
-	*size = ARRAY_SIZE(serial_io_dev);
-	return serial_io_dev;
-}
diff --git a/src/soc/intel/tigerlake/fsp_params.c b/src/soc/intel/tigerlake/fsp_params.c
index 7c9ab88..616daa0 100644
--- a/src/soc/intel/tigerlake/fsp_params.c
+++ b/src/soc/intel/tigerlake/fsp_params.c
@@ -132,22 +132,6 @@
 		params->SerialIoUartMode[i] = config->SerialIoUartMode[i];
 }
 
-static const pci_devfn_t serial_io_dev[] = {
-	PCH_DEVFN_I2C0,
-	PCH_DEVFN_I2C1,
-	PCH_DEVFN_I2C2,
-	PCH_DEVFN_I2C3,
-	PCH_DEVFN_I2C4,
-	PCH_DEVFN_I2C5,
-	PCH_DEVFN_GSPI0,
-	PCH_DEVFN_GSPI1,
-	PCH_DEVFN_GSPI2,
-	PCH_DEVFN_GSPI3,
-	PCH_DEVFN_UART0,
-	PCH_DEVFN_UART1,
-	PCH_DEVFN_UART2
-};
-
 __weak void mainboard_update_soc_chip_config(struct soc_intel_tigerlake_config *config)
 {
 	/* Override settings per board. */
@@ -483,10 +467,3 @@
 {
 	printk(BIOS_DEBUG, "WEAK: %s/%s called\n", __FILE__, __func__);
 }
-
-/* Return list of SOC LPSS controllers */
-const pci_devfn_t *soc_lpss_controllers_list(size_t *size)
-{
-	*size = ARRAY_SIZE(serial_io_dev);
-	return serial_io_dev;
-}