diff --git a/drivers/arm/mhu/mhu_v3_x.c b/drivers/arm/mhu/mhu_v3_x.c
new file mode 100644
index 0000000..118c608
--- /dev/null
+++ b/drivers/arm/mhu/mhu_v3_x.c
@@ -0,0 +1,475 @@
+/*
+ * Copyright (c) 2024, Arm Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <assert.h>
+#include <stdbool.h>
+#include <stdint.h>
+
+#include "mhu_v3_x.h"
+
+#include "mhu_v3_x_private.h"
+
+/*
+ * Get the device base from the device struct. Return an error if the dev is
+ * invalid.
+ */
+static enum mhu_v3_x_error_t get_dev_base(const struct mhu_v3_x_dev_t *dev,
+	 union _mhu_v3_x_frame_t **base)
+{
+	if (dev == NULL) {
+		return MHU_V_3_X_ERR_INVALID_PARAM;
+	}
+
+	/* Ensure driver has been initialized */
+	if (dev->is_initialized == false) {
+		return MHU_V_3_X_ERR_NOT_INIT;
+	}
+
+	*base = (union _mhu_v3_x_frame_t *)dev->base;
+
+	return MHU_V_3_X_ERR_NONE;
+}
+
+enum mhu_v3_x_error_t mhu_v3_x_driver_init(struct mhu_v3_x_dev_t *dev)
+{
+	uint32_t aidr = 0;
+	uint8_t mhu_major_rev;
+	union _mhu_v3_x_frame_t *p_mhu;
+
+	if (dev == NULL) {
+		return MHU_V_3_X_ERR_INVALID_PARAM;
+	}
+
+	/* Return if already initialized */
+	if (dev->is_initialized == true) {
+		return MHU_V_3_X_ERR_NONE;
+	}
+
+	p_mhu = (union _mhu_v3_x_frame_t *)dev->base;
+
+	/* Read revision from MHU hardware */
+	if (dev->frame == MHU_V3_X_PBX_FRAME) {
+		aidr = p_mhu->pbx_frame.pbx_ctrl_page.pbx_aidr;
+	} else if (dev->frame == MHU_V3_X_MBX_FRAME) {
+		aidr = p_mhu->mbx_frame.mbx_ctrl_page.mbx_aidr;
+	} else {
+		/* Only PBX and MBX frames are supported. */
+		return MHU_V_3_X_ERR_UNSUPPORTED;
+	}
+
+	/* Read the MHU Architecture Major Revision */
+	mhu_major_rev =
+		((aidr & MHU_ARCH_MAJOR_REV_MASK) >> MHU_ARCH_MAJOR_REV_OFF);
+
+	/* Return error if the MHU major revision is not 3 */
+	if (mhu_major_rev != MHU_MAJOR_REV_V3) {
+		/* Unsupported MHU version */
+		return MHU_V_3_X_ERR_UNSUPPORTED_VERSION;
+	}
+
+	/* Read the MHU Architecture Minor Revision */
+	dev->subversion =
+		((aidr & MHU_ARCH_MINOR_REV_MASK) >> MHU_ARCH_MINOR_REV_MASK);
+
+	/* Return error if the MHU minor revision is not 0 */
+	if (dev->subversion != MHU_MINOR_REV_3_0) {
+		/* Unsupported subversion */
+		return MHU_V_3_X_ERR_UNSUPPORTED_VERSION;
+	}
+
+	/* Initialize the Postbox/Mailbox to remain in operational state */
+	if (dev->frame == MHU_V3_X_PBX_FRAME) {
+		p_mhu->pbx_frame.pbx_ctrl_page.pbx_ctrl |= MHU_V3_OP_REQ;
+	} else if (dev->frame == MHU_V3_X_MBX_FRAME) {
+		p_mhu->mbx_frame.mbx_ctrl_page.mbx_ctrl |= MHU_V3_OP_REQ;
+	} else {
+		/* Only PBX and MBX frames are supported. */
+		return MHU_V_3_X_ERR_UNSUPPORTED;
+	}
+
+	dev->is_initialized = true;
+
+	return MHU_V_3_X_ERR_NONE;
+}
+
+enum mhu_v3_x_error_t mhu_v3_x_get_num_channel_implemented(
+	 const struct mhu_v3_x_dev_t *dev,
+	 enum mhu_v3_x_channel_type_t ch_type, uint8_t *num_ch)
+{
+	enum mhu_v3_x_error_t status;
+	union _mhu_v3_x_frame_t *p_mhu;
+
+	if (num_ch == NULL) {
+		return MHU_V_3_X_ERR_INVALID_PARAM;
+	}
+
+	/* Get dev->base if it is valid or return an error if dev is not */
+	status = get_dev_base(dev, &p_mhu);
+	if (status != MHU_V_3_X_ERR_NONE) {
+		return status;
+	}
+
+	/* Only doorbell channel is supported */
+	if (ch_type != MHU_V3_X_CHANNEL_TYPE_DBCH) {
+		return MHU_V_3_X_ERR_UNSUPPORTED;
+	}
+
+	/* Read the number of channels implemented in the MHU */
+	if (dev->frame == MHU_V3_X_PBX_FRAME) {
+		*num_ch = (p_mhu->pbx_frame.pbx_ctrl_page.pbx_dbch_cfg0 + 1);
+	} else if (dev->frame == MHU_V3_X_MBX_FRAME) {
+		*num_ch = (p_mhu->mbx_frame.mbx_ctrl_page.mbx_dbch_cfg0 + 1);
+	} else {
+		/* Only PBX and MBX frames are supported. */
+		return MHU_V_3_X_ERR_UNSUPPORTED;
+	}
+
+	return MHU_V_3_X_ERR_NONE;
+}
+
+enum mhu_v3_x_error_t mhu_v3_x_doorbell_clear(const struct mhu_v3_x_dev_t *dev,
+	 const uint32_t channel, uint32_t flags)
+{
+	union _mhu_v3_x_frame_t *p_mhu;
+	struct _mhu_v3_x_mdbcw_reg_t *mdbcw_reg;
+	enum mhu_v3_x_error_t status;
+
+	/* Get dev->base if it is valid or return an error if dev is not */
+	status = get_dev_base(dev, &p_mhu);
+	if (status != MHU_V_3_X_ERR_NONE) {
+		return status;
+	}
+
+	/* Only MBX can clear the Doorbell channel */
+	if (dev->frame != MHU_V3_X_MBX_FRAME) {
+		return MHU_V_3_X_ERR_INVALID_PARAM;
+	}
+
+	p_mhu = (union _mhu_v3_x_frame_t *)dev->base;
+	mdbcw_reg = (struct _mhu_v3_x_mdbcw_reg_t *)
+		&(p_mhu->mbx_frame.mdbcw_page);
+
+	/* Clear the bits in the doorbell channel */
+	mdbcw_reg[channel].mdbcw_clr |= flags;
+
+	return MHU_V_3_X_ERR_NONE;
+}
+
+enum mhu_v3_x_error_t mhu_v3_x_doorbell_write(const struct mhu_v3_x_dev_t *dev,
+	 const uint32_t channel, uint32_t flags)
+{
+	union _mhu_v3_x_frame_t *p_mhu;
+	struct _mhu_v3_x_pdbcw_reg_t *pdbcw_reg;
+	enum mhu_v3_x_error_t status;
+
+	/* Get dev->base if it is valid or return an error if dev is not */
+	status = get_dev_base(dev, &p_mhu);
+	if (status != MHU_V_3_X_ERR_NONE) {
+		return status;
+	}
+
+	/* Only PBX can set the Doorbell channel value */
+	if (dev->frame != MHU_V3_X_PBX_FRAME) {
+		return MHU_V_3_X_ERR_INVALID_PARAM;
+	}
+
+	p_mhu = (union _mhu_v3_x_frame_t *)dev->base;
+
+	pdbcw_reg = (struct _mhu_v3_x_pdbcw_reg_t *)
+		&(p_mhu->pbx_frame.pdbcw_page);
+
+	/* Write the value to the doorbell channel */
+	pdbcw_reg[channel].pdbcw_set |= flags;
+
+	return MHU_V_3_X_ERR_NONE;
+}
+
+enum mhu_v3_x_error_t mhu_v3_x_doorbell_read(const struct mhu_v3_x_dev_t *dev,
+	 const uint32_t channel, uint32_t *flags)
+{
+	union _mhu_v3_x_frame_t *p_mhu;
+	enum mhu_v3_x_error_t status;
+	struct _mhu_v3_x_mdbcw_reg_t *mdbcw_reg;
+	struct _mhu_v3_x_pdbcw_reg_t *pdbcw_reg;
+
+	if (flags == NULL) {
+		return MHU_V_3_X_ERR_INVALID_PARAM;
+	}
+
+	/* Get dev->base if it is valid or return an error if dev is not */
+	status = get_dev_base(dev, &p_mhu);
+	if (status != MHU_V_3_X_ERR_NONE) {
+		return status;
+	}
+
+	p_mhu = (union _mhu_v3_x_frame_t *)dev->base;
+
+	if (dev->frame == MHU_V3_X_PBX_FRAME) {
+		pdbcw_reg = (struct _mhu_v3_x_pdbcw_reg_t *)
+			&(p_mhu->pbx_frame.pdbcw_page);
+
+		/* Read the value from Postbox Doorbell status register */
+		*flags = pdbcw_reg[channel].pdbcw_st;
+	} else if (dev->frame == MHU_V3_X_MBX_FRAME) {
+		mdbcw_reg = (struct _mhu_v3_x_mdbcw_reg_t *)
+			&(p_mhu->mbx_frame.mdbcw_page);
+
+		/* Read the value from Mailbox Doorbell status register */
+		*flags = mdbcw_reg[channel].mdbcw_st;
+	} else {
+		/* Only PBX and MBX frames are supported. */
+		return MHU_V_3_X_ERR_UNSUPPORTED;
+	}
+
+	return MHU_V_3_X_ERR_NONE;
+}
+
+enum mhu_v3_x_error_t mhu_v3_x_doorbell_mask_set(
+	 const struct mhu_v3_x_dev_t *dev, const uint32_t channel,
+	 uint32_t flags)
+{
+	union _mhu_v3_x_frame_t *p_mhu;
+	struct _mhu_v3_x_mdbcw_reg_t *mdbcw_reg;
+	enum mhu_v3_x_error_t status;
+
+	/* Get dev->base if it is valid or return an error if dev is not */
+	status = get_dev_base(dev, &p_mhu);
+	if (status != MHU_V_3_X_ERR_NONE) {
+		return status;
+	}
+
+	/* Doorbell channel mask is not applicable for PBX */
+	if (dev->frame != MHU_V3_X_MBX_FRAME) {
+		return MHU_V_3_X_ERR_INVALID_PARAM;
+	}
+
+	p_mhu = (union _mhu_v3_x_frame_t *)dev->base;
+
+	mdbcw_reg = (struct _mhu_v3_x_mdbcw_reg_t *)
+		&(p_mhu->mbx_frame.mdbcw_page);
+
+	/* Set the Doorbell channel mask */
+	mdbcw_reg[channel].mdbcw_msk_set |= flags;
+
+	return MHU_V_3_X_ERR_NONE;
+}
+
+enum mhu_v3_x_error_t mhu_v3_x_doorbell_mask_clear(
+	 const struct mhu_v3_x_dev_t *dev, const uint32_t channel,
+	 uint32_t flags)
+{
+	union _mhu_v3_x_frame_t *p_mhu;
+	struct _mhu_v3_x_mdbcw_reg_t *mdbcw_reg;
+	enum mhu_v3_x_error_t status;
+
+	/* Get dev->base if it is valid or return an error if dev is not */
+	status = get_dev_base(dev, &p_mhu);
+	if (status != MHU_V_3_X_ERR_NONE) {
+		return status;
+	}
+
+	/* Doorbell channel mask is not applicable for PBX */
+	if (dev->frame != MHU_V3_X_MBX_FRAME) {
+		return MHU_V_3_X_ERR_INVALID_PARAM;
+	}
+
+	p_mhu = (union _mhu_v3_x_frame_t *)dev->base;
+
+	mdbcw_reg = (struct _mhu_v3_x_mdbcw_reg_t *)
+		&(p_mhu->mbx_frame.mdbcw_page);
+
+	/* Clear the Doorbell channel mask */
+	mdbcw_reg[channel].mdbcw_msk_clr = flags;
+
+	return MHU_V_3_X_ERR_NONE;
+}
+
+enum mhu_v3_x_error_t mhu_v3_x_doorbell_mask_get(
+	 const struct mhu_v3_x_dev_t *dev, const uint32_t channel,
+	 uint32_t *flags)
+{
+	union _mhu_v3_x_frame_t *p_mhu;
+	struct _mhu_v3_x_mdbcw_reg_t *mdbcw_reg;
+	enum mhu_v3_x_error_t status;
+
+	if (flags == NULL) {
+		return MHU_V_3_X_ERR_INVALID_PARAM;
+	}
+
+	/* Get dev->base if it is valid or return an error if dev is not */
+	status = get_dev_base(dev, &p_mhu);
+	if (status != MHU_V_3_X_ERR_NONE) {
+		return status;
+	}
+
+	/* Doorbell channel mask is not applicable for PBX */
+	if (dev->frame != MHU_V3_X_MBX_FRAME) {
+		return MHU_V_3_X_ERR_INVALID_PARAM;
+	}
+
+	p_mhu = (union _mhu_v3_x_frame_t *)dev->base;
+
+	mdbcw_reg = (struct _mhu_v3_x_mdbcw_reg_t *)
+		&(p_mhu->mbx_frame.mdbcw_page);
+
+	/* Save the Doorbell channel mask status */
+	*flags = mdbcw_reg[channel].mdbcw_msk_st;
+
+	return MHU_V_3_X_ERR_NONE;
+}
+
+enum mhu_v3_x_error_t mhu_v3_x_channel_interrupt_enable(
+	 const struct mhu_v3_x_dev_t *dev, const uint32_t channel,
+	 enum mhu_v3_x_channel_type_t ch_type)
+{
+	enum mhu_v3_x_error_t status;
+
+	union _mhu_v3_x_frame_t *p_mhu;
+	struct _mhu_v3_x_pdbcw_reg_t *pdbcw_reg;
+	struct _mhu_v3_x_mdbcw_reg_t *mdbcw_reg;
+
+	/* Get dev->base if it is valid or return an error if dev is not */
+	status = get_dev_base(dev, &p_mhu);
+	if (status != MHU_V_3_X_ERR_NONE) {
+		return status;
+	}
+
+	/* Only doorbell channel is supported */
+	if (ch_type != MHU_V3_X_CHANNEL_TYPE_DBCH) {
+		return MHU_V_3_X_ERR_UNSUPPORTED;
+	}
+
+	p_mhu = (union _mhu_v3_x_frame_t *)dev->base;
+
+	if (dev->frame == MHU_V3_X_PBX_FRAME) {
+		pdbcw_reg = (struct _mhu_v3_x_pdbcw_reg_t *)
+			&(p_mhu->pbx_frame.pdbcw_page);
+
+		/*
+		 * Enable this doorbell channel to generate interrupts for
+		 * transfer acknowledge events.
+		 */
+		pdbcw_reg[channel].pdbcw_int_en = MHU_V3_X_PDBCW_INT_X_TFR_ACK;
+
+		/*
+		 * Enable this doorbell channel to contribute to the PBX
+		 * combined interrupt.
+		 */
+		pdbcw_reg[channel].pdbcw_ctrl = MHU_V3_X_PDBCW_CTRL_PBX_COMB_EN;
+	} else if (dev->frame == MHU_V3_X_MBX_FRAME) {
+		mdbcw_reg = (struct _mhu_v3_x_mdbcw_reg_t *)
+			&(p_mhu->mbx_frame.mdbcw_page);
+
+		/*
+		 * Enable this doorbell channel to contribute to the MBX
+		 * combined interrupt.
+		 */
+		mdbcw_reg[channel].mdbcw_ctrl = MHU_V3_X_MDBCW_CTRL_MBX_COMB_EN;
+	} else {
+		/* Only PBX and MBX frames are supported. */
+		return MHU_V_3_X_ERR_UNSUPPORTED;
+	}
+
+	return MHU_V_3_X_ERR_NONE;
+}
+
+enum mhu_v3_x_error_t mhu_v3_x_channel_interrupt_disable(
+	 const struct mhu_v3_x_dev_t *dev, const uint32_t channel,
+	 enum mhu_v3_x_channel_type_t ch_type)
+{
+	enum mhu_v3_x_error_t status;
+
+	union _mhu_v3_x_frame_t *p_mhu;
+	struct _mhu_v3_x_pdbcw_reg_t *pdbcw_reg;
+	struct _mhu_v3_x_mdbcw_reg_t *mdbcw_reg;
+
+	/* Get dev->base if it is valid or return an error if dev is not */
+	status = get_dev_base(dev, &p_mhu);
+	if (status != MHU_V_3_X_ERR_NONE) {
+		return status;
+	}
+
+	/* Only doorbell channel is supported */
+	if (ch_type != MHU_V3_X_CHANNEL_TYPE_DBCH) {
+		return MHU_V_3_X_ERR_UNSUPPORTED;
+	}
+
+	p_mhu = (union _mhu_v3_x_frame_t *)dev->base;
+
+	if (dev->frame == MHU_V3_X_PBX_FRAME) {
+		pdbcw_reg = (struct _mhu_v3_x_pdbcw_reg_t *)
+			&(p_mhu->pbx_frame.pdbcw_page);
+
+		/* Clear channel transfer acknowledge event interrupt */
+		pdbcw_reg[channel].pdbcw_int_clr = MHU_V3_X_PDBCW_INT_X_TFR_ACK;
+
+		/* Disable channel transfer acknowledge event interrupt */
+		pdbcw_reg[channel].pdbcw_int_en &=
+			~(MHU_V3_X_PDBCW_INT_X_TFR_ACK);
+
+		/*
+		 * Disable this doorbell channel from contributing to the PBX
+		 * combined interrupt.
+		 */
+		pdbcw_reg[channel].pdbcw_ctrl &=
+			~(MHU_V3_X_PDBCW_CTRL_PBX_COMB_EN);
+	} else if (dev->frame == MHU_V3_X_MBX_FRAME) {
+		mdbcw_reg = (struct _mhu_v3_x_mdbcw_reg_t *)
+			&(p_mhu->mbx_frame.mdbcw_page);
+
+		/*
+		 * Disable this doorbell channel from contributing to the MBX
+		 * combined interrupt.
+		 */
+		mdbcw_reg[channel].mdbcw_ctrl &=
+			~(MHU_V3_X_MDBCW_CTRL_MBX_COMB_EN);
+	} else {
+		/* Only PBX and MBX frames are supported. */
+		return MHU_V_3_X_ERR_UNSUPPORTED;
+	}
+
+	return MHU_V_3_X_ERR_NONE;
+}
+
+enum mhu_v3_x_error_t mhu_v3_x_channel_interrupt_clear(
+	 const struct mhu_v3_x_dev_t *dev, const uint32_t channel,
+	 enum mhu_v3_x_channel_type_t ch_type)
+{
+	enum mhu_v3_x_error_t status;
+	union _mhu_v3_x_frame_t *p_mhu;
+	struct _mhu_v3_x_pdbcw_reg_t *pdbcw_reg;
+
+	/* Get dev->base if it is valid or return an error if dev is not */
+	status = get_dev_base(dev, &p_mhu);
+	if (status != MHU_V_3_X_ERR_NONE) {
+		return status;
+	}
+
+	/* Only doorbell channel is supported */
+	if (ch_type != MHU_V3_X_CHANNEL_TYPE_DBCH) {
+		return MHU_V_3_X_ERR_UNSUPPORTED;
+	}
+
+	/*
+	 * Only postbox doorbell channel transfer acknowledge interrupt can be
+	 * cleared manually.
+	 *
+	 * To clear MBX interrupt the unmasked status must be cleared using
+	 * mhu_v3_x_doorbell_clear.
+	 */
+	if (dev->frame != MHU_V3_X_PBX_FRAME) {
+		return MHU_V_3_X_ERR_INVALID_PARAM;
+	}
+
+	p_mhu = (union _mhu_v3_x_frame_t *)dev->base;
+	pdbcw_reg = (struct _mhu_v3_x_pdbcw_reg_t *)&(
+			p_mhu->pbx_frame.pdbcw_page);
+
+	/* Clear channel transfer acknowledge event interrupt */
+	pdbcw_reg[channel].pdbcw_int_clr |= 0x1;
+
+	return MHU_V_3_X_ERR_NONE;
+}
diff --git a/drivers/arm/mhu/mhu_v3_x.h b/drivers/arm/mhu/mhu_v3_x.h
new file mode 100644
index 0000000..a3a1950
--- /dev/null
+++ b/drivers/arm/mhu/mhu_v3_x.h
@@ -0,0 +1,226 @@
+/*
+ * Copyright (c) 2024, Arm Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#ifndef MHU_V3_X_H
+#define MHU_V3_X_H
+
+#include <stdbool.h>
+#include <stdint.h>
+
+/* MHU Architecture Major Revision 3 */
+#define MHU_MAJOR_REV_V3 U(0x2)
+/* MHU Architecture Minor Revision 0 */
+#define MHU_MINOR_REV_3_0 U(0x0)
+
+/* MHU Architecture Major Revision offset */
+#define MHU_ARCH_MAJOR_REV_OFF U(0x4)
+/* MHU Architecture Major Revision mask */
+#define MHU_ARCH_MAJOR_REV_MASK (U(0xf) << MHU_ARCH_MAJOR_REV_OFF)
+
+/* MHU Architecture Minor Revision offset */
+#define MHU_ARCH_MINOR_REV_OFF U(0x0)
+/* MHU Architecture Minor Revision mask */
+#define MHU_ARCH_MINOR_REV_MASK (U(0xf) << MHU_ARCH_MINOR_REV_OFF)
+
+/* MHUv3 PBX/MBX Operational Request offset */
+#define MHU_V3_OP_REQ_OFF U(0)
+/* MHUv3 PBX/MBX Operational Request */
+#define MHU_V3_OP_REQ (U(1) << MHU_V3_OP_REQ_OFF)
+
+/**
+ * MHUv3 error enumeration types
+ */
+enum mhu_v3_x_error_t {
+	/* No error */
+	MHU_V_3_X_ERR_NONE,
+	/* MHU driver not initialized */
+	MHU_V_3_X_ERR_NOT_INIT,
+	/* MHU driver alreary initialized */
+	MHU_V_3_X_ERR_ALREADY_INIT,
+	/* MHU Revision not supported error */
+	MHU_V_3_X_ERR_UNSUPPORTED_VERSION,
+	/* Operation not supported */
+	MHU_V_3_X_ERR_UNSUPPORTED,
+	/* Invalid parameter */
+	MHU_V_3_X_ERR_INVALID_PARAM,
+	/* General MHU driver error */
+	MHU_V_3_X_ERR_GENERAL,
+};
+
+/**
+ * MHUv3 channel types
+ */
+enum mhu_v3_x_channel_type_t {
+	/* Doorbell channel */
+	MHU_V3_X_CHANNEL_TYPE_DBCH,
+	/* Channel type count */
+	MHU_V3_X_CHANNEL_TYPE_COUNT,
+};
+
+/**
+ * MHUv3 frame types
+ */
+enum mhu_v3_x_frame_t {
+	/* MHUv3 postbox frame */
+	MHU_V3_X_PBX_FRAME,
+	/* MHUv3 mailbox frame */
+	MHU_V3_X_MBX_FRAME,
+};
+
+/**
+ * MHUv3 device structure
+ */
+struct mhu_v3_x_dev_t {
+	/* Base address of the MHUv3 frame */
+	uintptr_t base;
+	/* Type of the MHUv3 frame */
+	enum mhu_v3_x_frame_t frame;
+	/* Minor revision of the MHUv3 */
+	uint32_t subversion;
+	/* Flag to indicate if the MHUv3 is initialized */
+	bool is_initialized;
+};
+
+/**
+ * Initializes the MHUv3
+ *
+ * dev		MHU device struct mhu_v3_x_dev_t
+ *
+ * Returns mhu_v3_x_error_t error code
+ */
+enum mhu_v3_x_error_t mhu_v3_x_driver_init(struct mhu_v3_x_dev_t *dev);
+
+/**
+ * Returns the number of channels implemented
+ *
+ * dev		MHU device struct mhu_v3_x_dev_t
+ * ch_type	MHU channel type mhu_v3_x_channel_type_t
+ * num_ch	Pointer to the variable that will store the value
+ *
+ * Returns mhu_v3_x_error_t error code
+ */
+enum mhu_v3_x_error_t mhu_v3_x_get_num_channel_implemented(
+	 const struct mhu_v3_x_dev_t *dev, enum mhu_v3_x_channel_type_t ch_type,
+	 uint8_t *num_ch);
+
+/**
+ * Clear flags from a doorbell channel
+ *
+ * dev		MHU device struct mhu_v3_x_dev_t
+ * channel	Doorbell channel number
+ * flags	Flags to be cleared from the channel
+ *
+ * Returns mhu_v3_x_error_t error code
+ */
+enum mhu_v3_x_error_t mhu_v3_x_doorbell_clear(const struct mhu_v3_x_dev_t *dev,
+	 const uint32_t channel, uint32_t flags);
+
+/**
+ * Write flags to a doorbell channel
+ *
+ * dev		MHU device struct mhu_v3_x_dev_t
+ * channel	Doorbell channel number
+ * flags	Flags to be written to the channel
+ *
+ * Returns mhu_v3_x_error_t error code
+ */
+enum mhu_v3_x_error_t mhu_v3_x_doorbell_write(const struct mhu_v3_x_dev_t *dev,
+	 const uint32_t channel, uint32_t flags);
+
+/**
+ * Read value from a doorbell channel
+ *
+ * dev		MHU device struct mhu_v3_x_dev_t
+ * channel	Doorbell channel number
+ * flags	Pointer to the variable that will store the flags read from the
+ *		channel
+ *
+ * Returns mhu_v3_x_error_t error code
+ */
+enum mhu_v3_x_error_t mhu_v3_x_doorbell_read(const struct mhu_v3_x_dev_t *dev,
+	 const uint32_t channel, uint32_t *flags);
+
+/**
+ * Set bits in a doorbell channel mask which is used to disable interrupts for
+ * received flags corresponding to the mask
+ *
+ * dev		MHU device struct mhu_v3_x_dev_t
+ * channel	Doorbell channel number
+ * flags	Flags to set mask bits in this doorbell channel
+ *
+ * Returns mhu_v3_x_error_t error code
+ */
+enum mhu_v3_x_error_t mhu_v3_x_doorbell_mask_set(
+	 const struct mhu_v3_x_dev_t *dev, const uint32_t channel,
+	 uint32_t flags);
+
+/**
+ * Clear bits in a doorbell channel mask which is used to disable interrupts
+ * for received flags corresponding to the mask
+ *
+ * dev		MHU device struct mhu_v3_x_dev_t
+ * channel	Doorbell channel number
+ * flags	Flags to clear mask bits in this doorbell channel
+ *
+ * Returns mhu_v3_x_error_t error code
+ */
+enum mhu_v3_x_error_t mhu_v3_x_doorbell_mask_clear(
+	 const struct mhu_v3_x_dev_t *dev, const uint32_t channel, uint32_t flags);
+
+/**
+ * Get the mask of a doorbell channel which is used to disable interrupts for
+ * received flags corresponding to the mask
+ *
+ * dev		MHU device struct mhu_v3_x_dev_t
+ * channel	Doorbell channel number
+ * flags	Pointer to the variable that will store the flags read from the
+ *		mask value
+ *
+ * Returns mhu_v3_x_error_t error code
+ */
+enum mhu_v3_x_error_t mhu_v3_x_doorbell_mask_get(
+	 const struct mhu_v3_x_dev_t *dev, const uint32_t channel, uint32_t *flags);
+
+/**
+ * Enable the channel interrupt
+ *
+ * dev		MHU device struct mhu_v3_x_dev_t
+ * channel	Doorbell channel number
+ * ch_type	MHU channel type mhu_v3_x_channel_type_t
+ *
+ * Returns mhu_v3_x_error_t error code
+ */
+enum mhu_v3_x_error_t mhu_v3_x_channel_interrupt_enable(
+	 const struct mhu_v3_x_dev_t *dev, const uint32_t channel,
+	 enum mhu_v3_x_channel_type_t ch_type);
+
+/**
+ * Disable the channel interrupt
+ *
+ * dev		MHU device struct mhu_v3_x_dev_t
+ * channel	Doorbell channel number
+ * ch_type	MHU channel type mhu_v3_x_channel_type_t
+ *
+ * Returns mhu_v3_x_error_t error code
+ */
+enum mhu_v3_x_error_t mhu_v3_x_channel_interrupt_disable(
+	 const struct mhu_v3_x_dev_t *dev, const uint32_t channel,
+	 enum mhu_v3_x_channel_type_t ch_type);
+
+/**
+ * Clear the channel interrupt
+ *
+ * dev		MHU device struct mhu_v3_x_dev_t
+ * channel	Doorbell channel number
+ * ch_type	MHU channel type mhu_v3_x_channel_type_t
+ *
+ * Returns mhu_v3_x_error_t error code
+ */
+enum mhu_v3_x_error_t mhu_v3_x_channel_interrupt_clear(
+	 const struct mhu_v3_x_dev_t *dev, const uint32_t channel,
+	 enum mhu_v3_x_channel_type_t ch_type);
+
+#endif /* MHU_V3_X_H */
diff --git a/drivers/arm/mhu/mhu_v3_x_private.h b/drivers/arm/mhu/mhu_v3_x_private.h
new file mode 100644
index 0000000..9594a2a
--- /dev/null
+++ b/drivers/arm/mhu/mhu_v3_x_private.h
@@ -0,0 +1,222 @@
+/*
+ * Copyright (c) 2024, Arm Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#ifndef MHU_V3_X_PRIVATE_H
+#define MHU_V3_X_PRIVATE_H
+
+#include <stdint.h>
+
+/* Flag for PDBCW Interrupt Transfer Acknowledgment  */
+#define MHU_V3_X_PDBCW_INT_X_TFR_ACK 0x1
+
+/* Flag for PDBCW CTRL Postbox combined interrupts enable */
+#define MHU_V3_X_PDBCW_CTRL_PBX_COMB_EN 0x1
+
+/* Flag for MDBCW CTRL Mailbox combined interrupts enable */
+#define MHU_V3_X_MDBCW_CTRL_MBX_COMB_EN 0x1
+
+/**
+ * Postbox control page structure
+ */
+struct _mhu_v3_x_pbx_ctrl_reg_t {
+	/* Offset: 0x000 (R/ ) Postbox Block Identifier */
+	const volatile uint32_t pbx_blk_id;
+	/* Offset: 0x004 (R/ ) Reserved */
+	const volatile uint8_t reserved_0[0x10 - 0x04];
+	/* Offset: 0x010 (R/ ) Postbox Feature Support 0 */
+	const volatile uint32_t pbx_feat_spt0;
+	/* Offset: 0x014 (R/ ) Postbox Feature Support 1 */
+	const volatile uint32_t pbx_feat_spt1;
+	/* Offset: 0x018 (R/ ) Reserved */
+	const volatile uint8_t reserved_1[0x20 - 0x18];
+	/* Offset: 0x020 (R/ ) Postbox Doorbell Channel Configuration 0 */
+	const volatile uint32_t pbx_dbch_cfg0;
+	/* Offset: 0x024 (R/ ) Reserved */
+	const volatile uint8_t reserved_2[0x30 - 0x24];
+	/* Offset: 0x030 (R/ ) Postbox FIFO Channel Configuration 0 */
+	const volatile uint32_t pbx_ffch_cfg0;
+	/* Offset: 0x034 (R/ ) Reserved */
+	const volatile uint8_t reserved_3[0x40 - 0x34];
+	/* Offset: 0x040 (R/ ) Postbox Fast Channel Configuration 0 */
+	const volatile uint32_t pbx_fch_cfg0;
+	/* Offset: 0x044 (R/ ) Reserved */
+	const volatile uint8_t reserved_4[0x100 - 0x44];
+	/* Offset: 0x100 (R/W) Postbox control */
+	volatile uint32_t pbx_ctrl;
+	/* Offset: 0x164 (R/ ) Reserved */
+	const volatile uint8_t reserved_5[0x400 - 0x104];
+	/*
+	 * Offset: 0x400 (R/ ) Postbox Doorbell Channel Interrupt Status n,
+	 * where n is 0 - 3.
+	 */
+	const volatile uint32_t pbx_dbch_int_st[4];
+	/*
+	 * Offset: 0x410 (R/ ) Postbox FIFO Channel <n> Interrupt Status n,
+	 * where n is 0 - 1.
+	 */
+	const volatile uint32_t pbx_ffch_int_st[2];
+	/* Offset: 0x418 (R/ ) Reserved */
+	const uint8_t reserved_6[0xFC8 - 0x418];
+	/* Offset: 0xFC8 (R/ ) Postbox Implementer Identification Register */
+	const volatile uint32_t pbx_iidr;
+	/* Offset: 0xFCC (R/ ) Postbox Architecture Identification Register */
+	const volatile uint32_t pbx_aidr;
+	/*
+	 * Offset: 0xFD0 (R/ ) Postbox Implementation Defined Identification
+	 * Register n, where n is 0 - 11.
+	 */
+	const volatile uint32_t impl_def_id[12];
+};
+
+/**
+ * Postbox doorbell channel window page structure
+ */
+struct _mhu_v3_x_pdbcw_reg_t {
+	/* Offset: 0x000 (R/ ) Postbox Doorbell Channel Window Status */
+	const volatile uint32_t pdbcw_st;
+	/* Offset: 0x004 (R/ ) Reserved */
+	const uint8_t reserved_0[0xC - 0x4];
+	/* Offset: 0x00C ( /W) Postbox Doorbell Channel Window Set */
+	volatile uint32_t pdbcw_set;
+	/*
+	 * Offset: 0x010 (R/ ) Postbox Doorbell Channel Window Interrupt Status
+	 */
+	const volatile uint32_t pdbcw_int_st;
+	/*
+	 * Offset: 0x014 ( /W) Postbox Doorbell Channel Window Interrupt Clear
+	 */
+	volatile uint32_t pdbcw_int_clr;
+	/*
+	 * Offset: 0x018 (R/W) Postbox Doorbell Channel Window Interrupt Enable
+	 */
+	volatile uint32_t pdbcw_int_en;
+	/* Offset: 0x01C (R/W) Postbox Doorbell Channel Window Control */
+	volatile uint32_t pdbcw_ctrl;
+};
+
+/**
+ * Postbox structure
+ */
+struct _mhu_v3_x_pbx {
+	/* Postbox Control */
+	struct _mhu_v3_x_pbx_ctrl_reg_t pbx_ctrl_page;
+	/* Postbox Doorbell Channel Window */
+	struct _mhu_v3_x_pdbcw_reg_t pdbcw_page;
+};
+
+/**
+ * Mailbox control page structure
+ */
+struct _mhu_v3_x_mbx_ctrl_reg_t {
+	/* Offset: 0x000 (R/ ) Mailbox Block Identifier */
+	const volatile uint32_t mbx_blk_id;
+	/* Offset: 0x004 (R/ ) Reserved */
+	const volatile uint8_t reserved_0[0x10 - 0x04];
+	/* Offset: 0x010 (R/ ) Mailbox Feature Support 0 */
+	const volatile uint32_t mbx_feat_spt0;
+	/* Offset: 0x014 (R/ ) Mailbox Feature Support 1 */
+	const volatile uint32_t mbx_feat_spt1;
+	/* Offset: 0x018 (R/ ) Reserved */
+	const volatile uint8_t reserved_1[0x20 - 0x18];
+	/* Offset: 0x020 (R/ ) Mailbox Doorbell Channel Configuration 0 */
+	const volatile uint32_t mbx_dbch_cfg0;
+	/* Offset: 0x024 (R/ ) Reserved */
+	const volatile uint8_t reserved_2[0x30 - 0x24];
+	/* Offset: 0x030 (R/ ) Mailbox FIFO Channel Configuration 0 */
+	const volatile uint32_t mbx_ffch_cfg0;
+	/* Offset: 0x034 (R/ ) Reserved */
+	const volatile uint8_t reserved_4[0x40 - 0x34];
+	/* Offset: 0x040 (R/ ) Mailbox Fast Channel Configuration 0 */
+	const volatile uint32_t mbx_fch_cfg0;
+	/* Offset: 0x044 (R/ ) Reserved */
+	const volatile uint8_t reserved_5[0x100 - 0x44];
+	/* Offset: 0x100 (R/W) Mailbox control */
+	volatile uint32_t mbx_ctrl;
+	/* Offset: 0x104 (R/ ) Reserved */
+	const volatile uint8_t reserved_6[0x140 - 0x104];
+	/* Offset: 0x140 (R/W) Mailbox Fast Channel control */
+	volatile uint32_t mbx_fch_ctrl;
+	/* Offset: 0x144 (R/W) Mailbox Fast Channel Group Interrupt Enable */
+	volatile uint32_t mbx_fcg_int_en;
+	/* Offset: 0x148 (R/ ) Reserved */
+	const volatile uint8_t reserved_7[0x400 - 0x148];
+	/*
+	 * Offset: 0x400 (R/ ) Mailbox Doorbell Channel Interrupt Status n,
+	 * where n = 0 - 3.
+	 */
+	const volatile uint32_t mbx_dbch_int_st[4];
+	/*
+	 * Offset: 0x410 (R/ ) Mailbox FIFO Channel Interrupt Status n, where
+	 * n = 0 - 1.
+	 */
+	const volatile uint32_t mbx_ffch_int_st[2];
+	/* Offset: 0x418 (R/ ) Reserved */
+	const volatile uint8_t reserved_8[0x470 - 0x418];
+	/* Offset: 0x470 (R/ ) Mailbox Fast Channel Group Interrupt Status */
+	const volatile uint32_t mbx_fcg_int_st;
+	/* Offset: 0x474 (R/ ) Reserved */
+	const volatile uint8_t reserved_9[0x480 - 0x474];
+	/*
+	 * Offset: 0x480 (R/ ) Mailbox Fast Channel Group <n> Interrupt Status,
+	 * where n = 0 - 31.
+	 */
+	const volatile uint32_t mbx_fch_grp_int_st[32];
+	/* Offset: 0x500 (R/ ) Reserved */
+	const volatile uint8_t reserved_10[0xFC8 - 0x500];
+	/* Offset: 0xFC8 (R/ ) Mailbox Implementer Identification Register */
+	const volatile uint32_t mbx_iidr;
+	/* Offset: 0xFCC (R/ ) Mailbox Architecture Identification Register */
+	const volatile uint32_t mbx_aidr;
+	/*
+	 * Offset: 0xFD0 (R/ ) Mailbox Implementation Defined Identification
+	 * Register n, where n is 0 - 11.
+	 */
+	const volatile uint32_t impl_def_id[12];
+};
+
+/**
+ * Mailbox doorbell channel window page structure
+ */
+struct _mhu_v3_x_mdbcw_reg_t {
+	/* Offset: 0x000 (R/ ) Mailbox Doorbell Channel Window Status */
+	const volatile uint32_t mdbcw_st;
+	/* Offset: 0x004 (R/ ) Mailbox Doorbell Channel Window Status Masked */
+	const volatile uint32_t mdbcw_st_msk;
+	/* Offset: 0x008 ( /W) Mailbox Doorbell Channel Window Clear */
+	volatile uint32_t mdbcw_clr;
+	/* Offset: 0x00C (R/ ) Reserved */
+	const volatile uint8_t reserved_0[0x10 - 0x0C];
+	/* Offset: 0x010 (R/ ) Mailbox Doorbell Channel Window Mask Status */
+	const volatile uint32_t mdbcw_msk_st;
+	/* Offset: 0x014 ( /W) Mailbox Doorbell Channel Window Mask Set */
+	volatile uint32_t mdbcw_msk_set;
+	/* Offset: 0x018 ( /W) Mailbox Doorbell Channel Window Mask Clear */
+	volatile uint32_t mdbcw_msk_clr;
+	/* Offset: 0x01C (R/W) Mailbox Doorbell Channel Window Control */
+	volatile uint32_t mdbcw_ctrl;
+};
+
+/**
+ * Mailbox structure
+ */
+struct _mhu_v3_x_mbx {
+	/* Mailbox control */
+	struct _mhu_v3_x_mbx_ctrl_reg_t mbx_ctrl_page;
+	/* Mailbox Doorbell Channel Window */
+	struct _mhu_v3_x_mdbcw_reg_t mdbcw_page;
+};
+
+/**
+ * MHUv3 frame type
+ */
+union _mhu_v3_x_frame_t {
+	/* Postbox Frame */
+	struct _mhu_v3_x_pbx pbx_frame;
+	/* Mailbox Frame */
+	struct _mhu_v3_x_mbx mbx_frame;
+};
+
+#endif /* MHU_V3_X_PRIVATE_H */