diff --git a/include/drivers/brcm/mdio/mdio.h b/include/drivers/brcm/mdio/mdio.h
new file mode 100644
index 0000000..b27c7b3
--- /dev/null
+++ b/include/drivers/brcm/mdio/mdio.h
@@ -0,0 +1,31 @@
+/*
+ * Copyright (c) 2016 - 2021, Broadcom
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#ifndef MDIO_H
+#define MDIO_H
+
+#define CMIC_MIIM_PARAM		(PLAT_CMIC_MIIM_BASE + 0x23cU)
+#define MDIO_PARAM_MIIM_CYCLE	29U
+#define MDIO_PARAM_INTERNAL_SEL	25U
+#define MDIO_PARAM_BUSID	22U
+#define MDIO_PARAM_BUSID_MASK	0x7U
+#define MDIO_PARAM_C45_SEL	21U
+#define MDIO_PARAM_PHYID	16U
+#define MDIO_PARAM_PHYID_MASK	0x1FU
+#define MDIO_PARAM_DATA		0U
+#define MDIO_PARAM_DATA_MASK	0xFFFFU
+#define CMIC_MIIM_READ_DATA	(PLAT_CMIC_MIIM_BASE + 0x240U)
+#define MDIO_READ_DATA_MASK	0xffffU
+#define CMIC_MIIM_ADDRESS	(PLAT_CMIC_MIIM_BASE + 0x244U)
+#define CMIC_MIIM_CTRL		(PLAT_CMIC_MIIM_BASE + 0x248U)
+#define MDIO_CTRL_WRITE_OP	0x1U
+#define MDIO_CTRL_READ_OP	0x2U
+#define CMIC_MIIM_STAT		(PLAT_CMIC_MIIM_BASE + 0x24cU)
+#define MDIO_STAT_DONE		1U
+
+int mdio_write(uint16_t busid, uint16_t phyid, uint32_t reg, uint16_t val);
+int mdio_read(uint16_t busid, uint16_t phyid, uint32_t reg);
+#endif /* MDIO_H */