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diff --git a/zephyr/include/emul/emul_anx7452.h b/zephyr/include/emul/emul_anx7452.h
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+++ b/zephyr/include/emul/emul_anx7452.h
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+/* Copyright 2023 The ChromiumOS Authors
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+/**
+ * @file
+ *
+ * @brief Backend API for ANX7452 retimer emulator
+ */
+
+#ifndef __EMUL_ANX7452_H
+#define __EMUL_ANX7452_H
+
+#include <zephyr/drivers/emul.h>
+#include <zephyr/drivers/i2c.h>
+#include <zephyr/drivers/i2c_emul.h>
+
+/** Types of "hidden" I2C devices */
+enum anx7452_emul_port {
+	TOP_EMUL_PORT,
+	CTLTOP_EMUL_PORT,
+};
+
+/**
+ * @brief ANX7452 retimer emulator backend API
+ * @defgroup anx7452_emul ANX7452 retimer emulator
+ * @{
+ *
+ * ANX7452 retimer emulator supports access to all its registers using I2C
+ * messages. Application may alter emulator state:
+ *
+ * - call @ref anx7452_emul_set_reg and @ref anx7452_emul_get_reg to set and get
+ * value of ANX7452 retimers registers
+ * - call anx7452_emul_set_err_* to change emulator behaviour on inadvisable
+ * driver behaviour
+ * - call functions from emul_common_i2c.h to setup custom handlers for I2C
+ *   messages
+ */
+
+/**
+ * @brief Set value of given register of ANX7452 retimer
+ *
+ * @param emul Pointer to ANX7452 retimer emulator
+ * @param reg Register address which value will be changed
+ * @param val New value of the register
+ */
+void anx7452_emul_set_reg(const struct emul *emul, int reg, uint8_t val);
+
+/**
+ * @brief Get value of given register of ANX7452 retimer
+ *
+ * @param emul Pointer to ANX7452 retimer emulator
+ * @param reg Register address
+ *
+ * @return Value of the register
+ */
+uint8_t anx7452_emul_get_reg(const struct emul *emul, int reg);
+
+/**
+ * @brief Reset the anx7452 emulator
+ *
+ * @param emul The emulator to reset
+ */
+void anx7452_emul_reset(const struct emul *emul);
+
+/**
+ * @brief Returns pointer to i2c_common_emul_data for given emul
+ *
+ * @param emul Pointer to anx7452 retimer emulator
+ * @return Pointer to i2c_common_emul_data for emul argument
+ */
+struct i2c_common_emul_data *
+emul_anx7452_get_i2c_common_data(const struct emul *emul,
+				 enum anx7452_emul_port port);
+
+/**
+ * @}
+ */
+
+#endif /* __EMUL_ANX7452 */