diff --git a/matter/si91x/support/src/rsi_spi_iface_init.c b/matter/si91x/support/src/rsi_spi_iface_init.c
new file mode 100644
index 0000000000..f97e6cc55a
--- /dev/null
+++ b/matter/si91x/support/src/rsi_spi_iface_init.c
@@ -0,0 +1,136 @@
+/*******************************************************************************
+* @file  rsi_spi_iface_init.c
+* @brief
+*******************************************************************************
+* # License
+* <b>Copyright 2020 Silicon Laboratories Inc. www.silabs.com</b>
+*******************************************************************************
+*
+* The licensor of this software is Silicon Laboratories Inc. Your use of this
+* software is governed by the terms of Silicon Labs Master Software License
+* Agreement (MSLA) available at
+* www.silabs.com/about-us/legal/master-software-license-agreement. This
+* software is distributed to you in Source Code format and is governed by the
+* sections of the MSLA applicable to Source Code.
+*
+******************************************************************************/
+/**
+ * @file     rsi_spi_iface_init.c
+ * @version  0.1
+ * @date     15 Aug 2015
+ *
+ *
+ *
+ * @brief SPI INIT: Functions to initiaize the SPI hardware interface in the module
+ * Description
+ * Contains the SPI Initialization function.
+ * Enable the SPI interface on the Wi-Fi chip.
+ * Only run once - during startup, after power-on, or reset
+ *
+ *
+ */
+
+/*
+  Includes
+ */
+#include "rsi_driver.h"
+#ifdef RSI_SPI_INTERFACE
+
+/*
+  Global Variables
+ */
+/** @addtogroup DRIVER2
+* @{
+*/
+/*=============================================*/
+/**
+ * @brief       Initialize the SPI secondary device interface of the module
+ * @param[in]   void
+ * @return        0              - Success \n
+ * @return        Non-Zero value - Failure \n
+ */
+
+int16_t rsi_spi_iface_init(void)
+{
+  SL_PRINTF(SL_SPI_IFACE_INIT_ENTRY, DRIVER, LOG_INFO);
+
+  uint8_t txCmd[4];
+  uint8_t localBuf[4] = { 0 };
+  int16_t retval      = 0;
+  uint16_t timeout;
+
+  // 10ms timeout on command, nothing magic, just a reasonable number
+  timeout = 100;
+
+  // Init the timer counter
+  RSI_RESET_TIMER1;
+  while (1) {
+    if (RSI_INC_TIMER_1 > timeout) {
+      retval = RSI_ERROR_SPI_TIMEOUT;
+      break;
+    }
+
+    txCmd[0] = (RSI_RS9116_INIT_CMD & 0xFF);
+    txCmd[1] = ((RSI_RS9116_INIT_CMD >> 8) & 0xFF);
+    txCmd[2] = ((RSI_RS9116_INIT_CMD >> 16) & 0xFF);
+    txCmd[3] = ((RSI_RS9116_INIT_CMD >> 24) & 0xFF);
+
+    retval = rsi_spi_transfer(txCmd, localBuf, sizeof(localBuf), RSI_MODE_8BIT);
+    // Retval = rsi_spi_send(txCmd, 2, localBuf, RSI_MODE_8BIT);
+    if (localBuf[3] == RSI_SPI_SUCCESS) {
+      retval = RSI_SUCCESS;
+      break;
+    } else {
+      retval = RSI_ERROR_SPI_BUSY;
+    }
+  }
+  SL_PRINTF(SL_SPI_IFACE_INIT_EXIT, DRIVER, LOG_INFO, "retval: %d", retval);
+  return retval;
+}
+
+/*=============================================*/
+/**
+ * @brief               Initialize the SPI secondary device interface of the module on ULP wakeup
+ * @param[in]           void
+ * @return              0              - Success \n
+ * @return              Non-Zero value - Failure \n
+ */
+int16_t rsi_ulp_wakeup_init(void)
+{
+  uint8_t txCmd[4];
+  uint8_t rxbuff[2];
+  int16_t retval = RSI_SUCCESS;
+  uint16_t timeout;
+
+  // 10ms timeout on command, nothing magic, just a reasonable number
+  timeout = 10;
+
+  // Init the timer counter
+  RSI_RESET_TIMER1;
+  while (1) {
+    if (RSI_INC_TIMER_1 > timeout) {
+      retval = RSI_ERROR_SPI_TIMEOUT;
+      break;
+    }
+
+    txCmd[0] = (RSI_RS9116_INIT_CMD & 0xFF);
+    txCmd[1] = ((RSI_RS9116_INIT_CMD >> 8) & 0xFF);
+    txCmd[2] = ((RSI_RS9116_INIT_CMD >> 16) & 0xFF);
+    txCmd[3] = ((RSI_RS9116_INIT_CMD >> 24) & 0xFF);
+
+    rsi_spi_transfer(txCmd, rxbuff, 2, RSI_MODE_8BIT);
+    if (rxbuff[1] == RSI_SPI_FAIL) {
+      break;
+    } else if (rxbuff[1] == 0x00) {
+      rsi_spi_transfer(&txCmd[2], rxbuff, 2, RSI_MODE_8BIT);
+      if (rxbuff[1] == RSI_SPI_SUCCESS) {
+        break;
+      }
+    } else {
+      retval = RSI_ERROR_SPI_BUSY;
+    }
+  }
+  return retval;
+}
+#endif
+/** @} */