diff --git a/ports/zephyr/CMakeLists.txt b/ports/zephyr/CMakeLists.txt
index c15d68babe..a5cc477204 100644
--- a/ports/zephyr/CMakeLists.txt
+++ b/ports/zephyr/CMakeLists.txt
@@ -71,6 +71,11 @@ set(MICROPY_SOURCE_SHARED
 )
 list(TRANSFORM MICROPY_SOURCE_SHARED PREPEND ${MICROPY_DIR}/shared/)
 
+set(MICROPY_SOURCE_DRIVERS
+    bus/softspi.c
+)
+list(TRANSFORM MICROPY_SOURCE_DRIVERS PREPEND ${MICROPY_DIR}/drivers/)
+
 set(MICROPY_QSTRDEFS_PORT
     ${MICROPY_PORT_DIR}/qstrdefsport.h
 )
@@ -89,6 +94,7 @@ set(MICROPY_SOURCE_QSTR
     ${MICROPY_SOURCE_PY}
     ${MICROPY_SOURCE_EXTMOD}
     ${MICROPY_SOURCE_SHARED}
+    ${MICROPY_SOURCE_DRIVERS}
     ${MICROPY_SOURCE_LIB}
     ${MICROPY_SOURCE_PORT}
 )
diff --git a/ports/zephyr/mpconfigport.h b/ports/zephyr/mpconfigport.h
index b6f9176b6a..1ab838ad9c 100644
--- a/ports/zephyr/mpconfigport.h
+++ b/ports/zephyr/mpconfigport.h
@@ -62,9 +62,11 @@
 #define MICROPY_PY_MACHINE          (1)
 #define MICROPY_PY_MACHINE_INCLUDEFILE "ports/zephyr/modmachine.c"
 #define MICROPY_PY_MACHINE_I2C      (1)
+#define MICROPY_PY_MACHINE_SOFTI2C  (1)
 #define MICROPY_PY_MACHINE_SPI      (1)
 #define MICROPY_PY_MACHINE_SPI_MSB (SPI_TRANSFER_MSB)
 #define MICROPY_PY_MACHINE_SPI_LSB (SPI_TRANSFER_LSB)
+#define MICROPY_PY_MACHINE_SOFTSPI  (1)
 #define MICROPY_PY_MACHINE_PIN_MAKE_NEW mp_pin_make_new
 #define MICROPY_PY_MACHINE_UART     (1)
 #define MICROPY_PY_MACHINE_UART_INCLUDEFILE "ports/zephyr/machine_uart.c"