diff --git a/ports/mimxrt10xx/peripherals/mimxrt10xx/MIMXRT1011/periph.c b/ports/mimxrt10xx/peripherals/mimxrt10xx/MIMXRT1011/periph.c
index bdf3299217..0c2b5893bc 100644
--- a/ports/mimxrt10xx/peripherals/mimxrt10xx/MIMXRT1011/periph.c
+++ b/ports/mimxrt10xx/peripherals/mimxrt10xx/MIMXRT1011/periph.c
@@ -29,7 +29,7 @@
 #include "py/mphal.h"
 #include "mimxrt10xx/periph.h"
 
-LPI2C_Type *mcu_i2c_banks[2] = { LPI2C1, LPI2C2 };
+LPI2C_Type *const mcu_i2c_banks[2] = { LPI2C1, LPI2C2 };
 
 const mcu_periph_obj_t mcu_i2c_sda_list[8] = {
     PERIPH_PIN(1, 0, kIOMUXC_LPI2C1_SDA_SELECT_INPUT, 0, &pin_GPIO_AD_13),
@@ -55,7 +55,7 @@ const mcu_periph_obj_t mcu_i2c_scl_list[8] = {
     PERIPH_PIN(2, 3, kIOMUXC_LPI2C2_SCL_SELECT_INPUT, 3, &pin_GPIO_10),
 };
 
-LPSPI_Type *mcu_spi_banks[2] = { LPSPI1, LPSPI2 };
+LPSPI_Type *const mcu_spi_banks[2] = { LPSPI1, LPSPI2 };
 
 const mcu_periph_obj_t mcu_spi_sck_list[4] = {
     PERIPH_PIN(1, 0, kIOMUXC_LPSPI1_SCK_SELECT_INPUT, 0, &pin_GPIO_AD_06),
@@ -81,7 +81,7 @@ const mcu_periph_obj_t mcu_spi_miso_list[4] = {
     PERIPH_PIN(2, 1, kIOMUXC_LPSPI2_SDI_SELECT_INPUT, 1, &pin_GPIO_SD_09),
 };
 
-LPUART_Type *mcu_uart_banks[4] = { LPUART1, LPUART2, LPUART3, LPUART4 };
+LPUART_Type *const mcu_uart_banks[4] = { LPUART1, LPUART2, LPUART3, LPUART4 };
 
 const mcu_periph_obj_t mcu_uart_rx_list[9] = {
     PERIPH_PIN(1, 2, kIOMUXC_LPUART1_RXD_SELECT_INPUT, 0, &pin_GPIO_SD_11),
diff --git a/ports/mimxrt10xx/peripherals/mimxrt10xx/MIMXRT1011/periph.h b/ports/mimxrt10xx/peripherals/mimxrt10xx/MIMXRT1011/periph.h
index c50d73294b..b3bddcb76b 100644
--- a/ports/mimxrt10xx/peripherals/mimxrt10xx/MIMXRT1011/periph.h
+++ b/ports/mimxrt10xx/peripherals/mimxrt10xx/MIMXRT1011/periph.h
@@ -27,18 +27,18 @@
 #ifndef MICROPY_INCLUDED_MIMXRT10XX_MIMXRT1011_PERIPHERALS_MIMXRT1011_PERIPH_H
 #define MICROPY_INCLUDED_MIMXRT10XX_MIMXRT1011_PERIPHERALS_MIMXRT1011_PERIPH_H
 
-extern LPI2C_Type *mcu_i2c_banks[2];
+extern LPI2C_Type *const mcu_i2c_banks[2];
 
 extern const mcu_periph_obj_t mcu_i2c_sda_list[8];
 extern const mcu_periph_obj_t mcu_i2c_scl_list[8];
 
-extern LPSPI_Type *mcu_spi_banks[2];
+extern LPSPI_Type *const mcu_spi_banks[2];
 
 extern const mcu_periph_obj_t mcu_spi_sck_list[4];
 extern const mcu_periph_obj_t mcu_spi_mosi_list[4];
 extern const mcu_periph_obj_t mcu_spi_miso_list[4];
 
-extern LPUART_Type *mcu_uart_banks[4];
+extern LPUART_Type *const mcu_uart_banks[4];
 
 extern const mcu_periph_obj_t mcu_uart_rx_list[9];
 extern const mcu_periph_obj_t mcu_uart_tx_list[9];
diff --git a/ports/mimxrt10xx/peripherals/mimxrt10xx/MIMXRT1021/periph.c b/ports/mimxrt10xx/peripherals/mimxrt10xx/MIMXRT1021/periph.c
index 5b21c12c2a..ffcadbb696 100644
--- a/ports/mimxrt10xx/peripherals/mimxrt10xx/MIMXRT1021/periph.c
+++ b/ports/mimxrt10xx/peripherals/mimxrt10xx/MIMXRT1021/periph.c
@@ -30,7 +30,7 @@
 #include "py/mphal.h"
 #include "mimxrt10xx/periph.h"
 
-LPI2C_Type *mcu_i2c_banks[4] = { LPI2C1, LPI2C2, LPI2C3, LPI2C4 };
+LPI2C_Type *const mcu_i2c_banks[4] = { LPI2C1, LPI2C2, LPI2C3, LPI2C4 };
 
 const mcu_periph_obj_t mcu_i2c_sda_list[8] = {
     PERIPH_PIN(1, 6, kIOMUXC_LPI2C1_SDA_SELECT_INPUT, 0, &pin_GPIO_EMC_03),
@@ -60,7 +60,7 @@ const mcu_periph_obj_t mcu_i2c_scl_list[8] = {
     PERIPH_PIN(4, 3, kIOMUXC_LPI2C4_SCL_SELECT_INPUT, 1, &pin_GPIO_SD_B1_02),
 };
 
-LPSPI_Type *mcu_spi_banks[4] = { LPSPI1, LPSPI2, LPSPI3, LPSPI4 };
+LPSPI_Type *const mcu_spi_banks[4] = { LPSPI1, LPSPI2, LPSPI3, LPSPI4 };
 
 const mcu_periph_obj_t mcu_spi_sck_list[8] = {
     PERIPH_PIN(1, 4, kIOMUXC_LPSPI1_SCK_SELECT_INPUT, 0, &pin_GPIO_SD_B0_02),
@@ -104,7 +104,7 @@ const mcu_periph_obj_t mcu_spi_miso_list[8] = {
     PERIPH_PIN(4, 4, kIOMUXC_LPSPI2_SDI_SELECT_INPUT, 1, &pin_GPIO_EMC_35),
 };
 
-LPUART_Type *mcu_uart_banks[8] = { LPUART1, LPUART2, LPUART3, LPUART4, LPUART5, LPUART6, LPUART7, LPUART8 };
+LPUART_Type *const mcu_uart_banks[8] = { LPUART1, LPUART2, LPUART3, LPUART4, LPUART5, LPUART6, LPUART7, LPUART8 };
 
 const mcu_periph_obj_t mcu_uart_rx_list[16] = {
     PERIPH_PIN(1, 2, 0, 0, &pin_GPIO_AD_B0_07),
diff --git a/ports/mimxrt10xx/peripherals/mimxrt10xx/MIMXRT1021/periph.h b/ports/mimxrt10xx/peripherals/mimxrt10xx/MIMXRT1021/periph.h
index 6c778ad525..9074987cd8 100644
--- a/ports/mimxrt10xx/peripherals/mimxrt10xx/MIMXRT1021/periph.h
+++ b/ports/mimxrt10xx/peripherals/mimxrt10xx/MIMXRT1021/periph.h
@@ -28,18 +28,18 @@
 #ifndef MICROPY_INCLUDED_MIMXRT10XX_PERIPHERALS_MIMXRT1021_PERIPH_H
 #define MICROPY_INCLUDED_MIMXRT10XX_PERIPHERALS_MIMXRT1021_PERIPH_H
 
-extern LPI2C_Type *mcu_i2c_banks[4];
+extern LPI2C_Type *const mcu_i2c_banks[4];
 
 extern const mcu_periph_obj_t mcu_i2c_sda_list[8];
 extern const mcu_periph_obj_t mcu_i2c_scl_list[8];
 
-extern LPSPI_Type *mcu_spi_banks[4];
+extern LPSPI_Type *const mcu_spi_banks[4];
 
 extern const mcu_periph_obj_t mcu_spi_sck_list[8];
 extern const mcu_periph_obj_t mcu_spi_mosi_list[8];
 extern const mcu_periph_obj_t mcu_spi_miso_list[8];
 
-extern LPUART_Type *mcu_uart_banks[8];
+extern LPUART_Type *const mcu_uart_banks[8];
 
 extern const mcu_periph_obj_t mcu_uart_rx_list[16];
 extern const mcu_periph_obj_t mcu_uart_tx_list[16];
diff --git a/ports/mimxrt10xx/peripherals/mimxrt10xx/MIMXRT1062/periph.c b/ports/mimxrt10xx/peripherals/mimxrt10xx/MIMXRT1062/periph.c
index 19ce48f288..b6efe5e6a9 100644
--- a/ports/mimxrt10xx/peripherals/mimxrt10xx/MIMXRT1062/periph.c
+++ b/ports/mimxrt10xx/peripherals/mimxrt10xx/MIMXRT1062/periph.c
@@ -29,7 +29,7 @@
 #include "py/mphal.h"
 #include "mimxrt10xx/periph.h"
 
-LPI2C_Type *mcu_i2c_banks[4] = { LPI2C1, LPI2C2, LPI2C3, LPI2C4 };
+LPI2C_Type *const mcu_i2c_banks[4] = { LPI2C1, LPI2C2, LPI2C3, LPI2C4 };
 
 const mcu_periph_obj_t mcu_i2c_sda_list[9] = {
     PERIPH_PIN(1, 2, kIOMUXC_LPI2C1_SDA_SELECT_INPUT, 0, &pin_GPIO_SD_B1_05),
@@ -61,7 +61,7 @@ const mcu_periph_obj_t mcu_i2c_scl_list[9] = {
     PERIPH_PIN(4, 0, kIOMUXC_LPI2C4_SCL_SELECT_INPUT, 1, &pin_GPIO_AD_B0_12),
 };
 
-LPSPI_Type *mcu_spi_banks[4] = { LPSPI1, LPSPI2, LPSPI3, LPSPI4 };
+LPSPI_Type *const mcu_spi_banks[4] = { LPSPI1, LPSPI2, LPSPI3, LPSPI4 };
 
 const mcu_periph_obj_t mcu_spi_sck_list[8] = {
     PERIPH_PIN(1, 3, kIOMUXC_LPSPI1_SCK_SELECT_INPUT, 0, &pin_GPIO_EMC_27),
@@ -105,7 +105,7 @@ const mcu_periph_obj_t mcu_spi_miso_list[8] = {
     PERIPH_PIN(4, 1, kIOMUXC_LPSPI4_SDI_SELECT_INPUT, 1, &pin_GPIO_B1_05),
 };
 
-LPUART_Type *mcu_uart_banks[8] = { LPUART1, LPUART2, LPUART3, LPUART4, LPUART5, LPUART6, LPUART7, LPUART8 };
+LPUART_Type *const mcu_uart_banks[8] = { LPUART1, LPUART2, LPUART3, LPUART4, LPUART5, LPUART6, LPUART7, LPUART8 };
 
 const mcu_periph_obj_t mcu_uart_rx_list[18] = {
     PERIPH_PIN(1, 2, 0, 0, &pin_GPIO_AD_B0_13),
diff --git a/ports/mimxrt10xx/peripherals/mimxrt10xx/MIMXRT1062/periph.h b/ports/mimxrt10xx/peripherals/mimxrt10xx/MIMXRT1062/periph.h
index 067c05d0d0..9a06a491f9 100644
--- a/ports/mimxrt10xx/peripherals/mimxrt10xx/MIMXRT1062/periph.h
+++ b/ports/mimxrt10xx/peripherals/mimxrt10xx/MIMXRT1062/periph.h
@@ -27,18 +27,18 @@
 #ifndef MICROPY_INCLUDED_MIMXRT10XX_MIMXRT1062_PERIPHERALS_MIMXRT1011_PERIPH_H
 #define MICROPY_INCLUDED_MIMXRT10XX_MIMXRT1062_PERIPHERALS_MIMXRT1011_PERIPH_H
 
-extern LPI2C_Type *mcu_i2c_banks[4];
+extern LPI2C_Type *const mcu_i2c_banks[4];
 
 extern const mcu_periph_obj_t mcu_i2c_sda_list[9];
 extern const mcu_periph_obj_t mcu_i2c_scl_list[9];
 
-extern LPSPI_Type *mcu_spi_banks[4];
+extern LPSPI_Type *const mcu_spi_banks[4];
 
 extern const mcu_periph_obj_t mcu_spi_sck_list[8];
 extern const mcu_periph_obj_t mcu_spi_mosi_list[8];
 extern const mcu_periph_obj_t mcu_spi_miso_list[8];
 
-extern LPUART_Type *mcu_uart_banks[8];
+extern LPUART_Type *const mcu_uart_banks[8];
 
 extern const mcu_periph_obj_t mcu_uart_rx_list[18];
 extern const mcu_periph_obj_t mcu_uart_tx_list[18];
diff --git a/ports/mimxrt10xx/peripherals/mimxrt10xx/periph.h b/ports/mimxrt10xx/peripherals/mimxrt10xx/periph.h
index c77497a775..818b203da4 100644
--- a/ports/mimxrt10xx/peripherals/mimxrt10xx/periph.h
+++ b/ports/mimxrt10xx/peripherals/mimxrt10xx/periph.h
@@ -72,9 +72,9 @@ typedef struct {
         .pin = p_pin, \
     }
 
-extern LPI2C_Type *mcu_i2c_banks[];
-extern LPSPI_Type *mcu_spi_banks[];
-extern LPUART_Type *mcu_uart_banks[];
+extern LPI2C_Type *const mcu_i2c_banks[];
+extern LPSPI_Type *const mcu_spi_banks[];
+extern LPUART_Type *const mcu_uart_banks[];
 
 #ifdef MIMXRT1011_SERIES
 #include "MIMXRT1011/periph.h"