diff --git a/drivers/gpu/drm/i915/display/intel_cx0_reg_defs.h b/drivers/gpu/drm/i915/display/intel_cx0_reg_defs.h
new file mode 100644
index 000000000000..dfe156141d73
--- /dev/null
+++ b/drivers/gpu/drm/i915/display/intel_cx0_reg_defs.h
@@ -0,0 +1,136 @@
+// SPDX-License-Identifier: MIT
+/*
+ * Copyright © 2022 Intel Corporation
+ */
+
+#ifndef __INTEL_CX0_REG_DEFS_H__
+#define __INTEL_CX0_REG_DEFS_H__
+
+#define _XELPDP_PORT_M2P_MSGBUS_CTL_LN0_A		0x64040
+#define _XELPDP_PORT_M2P_MSGBUS_CTL_LN0_B		0x64140
+#define _XELPDP_PORT_M2P_MSGBUS_CTL_LN0_USBC1		0x16F240
+#define _XELPDP_PORT_M2P_MSGBUS_CTL_LN0_USBC2		0x16F440
+#define _XELPDP_PORT_M2P_MSGBUS_CTL_LN0_USBC3		0x16F640
+#define _XELPDP_PORT_M2P_MSGBUS_CTL_LN0_USBC4		0x16F840
+#define _XELPDP_PORT_M2P_MSGBUS_CTL(port, lane)		(_PICK(port, \
+							 [PORT_A] = _XELPDP_PORT_M2P_MSGBUS_CTL_LN0_A, \
+							 [PORT_B] = _XELPDP_PORT_M2P_MSGBUS_CTL_LN0_B, \
+							 [PORT_TC1] = _XELPDP_PORT_M2P_MSGBUS_CTL_LN0_USBC1, \
+							 [PORT_TC2] = _XELPDP_PORT_M2P_MSGBUS_CTL_LN0_USBC2, \
+							 [PORT_TC3] = _XELPDP_PORT_M2P_MSGBUS_CTL_LN0_USBC3, \
+							 [PORT_TC4] = _XELPDP_PORT_M2P_MSGBUS_CTL_LN0_USBC4) + ((lane) * 4))
+
+#define XELPDP_PORT_M2P_MSGBUS_CTL(port, lane)		_MMIO(_XELPDP_PORT_M2P_MSGBUS_CTL(port, lane))
+#define  XELPDP_PORT_M2P_TRANSACTION_PENDING		REG_BIT(31)
+#define  XELPDP_PORT_M2P_COMMAND_TYPE_MASK		REG_GENMASK(30, 27)
+#define  XELPDP_PORT_M2P_COMMAND_WRITE_UNCOMMITTED	REG_FIELD_PREP(XELPDP_PORT_M2P_COMMAND_TYPE_MASK, 0x1)
+#define  XELPDP_PORT_M2P_COMMAND_WRITE_COMMITTED	REG_FIELD_PREP(XELPDP_PORT_M2P_COMMAND_TYPE_MASK, 0x2)
+#define  XELPDP_PORT_M2P_COMMAND_READ			REG_FIELD_PREP(XELPDP_PORT_M2P_COMMAND_TYPE_MASK, 0x3)
+#define  XELPDP_PORT_M2P_DATA_MASK			REG_GENMASK(23, 16)
+#define  XELPDP_PORT_M2P_DATA(val)			REG_FIELD_PREP(XELPDP_PORT_M2P_DATA_MASK, val)
+#define  XELPDP_PORT_M2P_TRANSACTION_RESET		REG_BIT(15)
+#define  XELPDP_PORT_M2P_ADDRESS_MASK			REG_GENMASK(11, 0)
+#define  XELPDP_PORT_M2P_ADDRESS(val)			REG_FIELD_PREP(XELPDP_PORT_M2P_ADDRESS_MASK, val)
+
+#define XELPDP_PORT_P2M_MSGBUS_STATUS(port, lane)	_MMIO(_XELPDP_PORT_M2P_MSGBUS_CTL(port, lane) + 8)
+#define  XELPDP_PORT_P2M_RESPONSE_READY			REG_BIT(31)
+#define  XELPDP_PORT_P2M_COMMAND_TYPE_MASK		REG_GENMASK(30, 27)
+#define  XELPDP_PORT_P2M_COMMAND_READ_ACK		0x4
+#define  XELPDP_PORT_P2M_COMMAND_WRITE_ACK		0x5
+#define  XELPDP_PORT_P2M_DATA_MASK			REG_GENMASK(23, 16)
+#define  XELPDP_PORT_P2M_DATA(val)			REG_FIELD_PREP(XELPDP_PORT_P2M_DATA_MASK, val)
+#define  XELPDP_PORT_P2M_ERROR_SET			REG_BIT(15)
+
+#define  XELPDP_MSGBUS_TIMEOUT_SLOW			1
+#define  XELPDP_MSGBUS_TIMEOUT_FAST_US			2
+#define XELPDP_PCLK_PLL_ENABLE_TIMEOUT_US		3200
+#define XELPDP_PCLK_PLL_DISABLE_TIMEOUT_US		20
+#define XELPDP_PORT_BUF_SOC_READY_TIMEOUT_US		100
+#define XELPDP_PORT_RESET_START_TIMEOUT_US		5
+#define XELPDP_PORT_POWERDOWN_UPDATE_TIMEOUT_US		100
+#define XELPDP_PORT_RESET_END_TIMEOUT			15
+#define XELPDP_REFCLK_ENABLE_TIMEOUT_US			1
+
+#define _XELPDP_PORT_BUF_CTL1_LN0_A			0x64004
+#define _XELPDP_PORT_BUF_CTL1_LN0_B			0x64104
+#define _XELPDP_PORT_BUF_CTL1_LN0_USBC1			0x16F200
+#define _XELPDP_PORT_BUF_CTL1_LN0_USBC2			0x16F400
+#define _XELPDP_PORT_BUF_CTL1_LN0_USBC3			0x16F600
+#define _XELPDP_PORT_BUF_CTL1_LN0_USBC4			0x16F800
+#define _XELPDP_PORT_BUF_CTL1(port)			(_PICK(port, \
+							 [PORT_A] = _XELPDP_PORT_BUF_CTL1_LN0_A, \
+							 [PORT_B] = _XELPDP_PORT_BUF_CTL1_LN0_B, \
+							 [PORT_TC1] = _XELPDP_PORT_BUF_CTL1_LN0_USBC1, \
+							 [PORT_TC2] = _XELPDP_PORT_BUF_CTL1_LN0_USBC2, \
+							 [PORT_TC3] = _XELPDP_PORT_BUF_CTL1_LN0_USBC3, \
+							 [PORT_TC4] = _XELPDP_PORT_BUF_CTL1_LN0_USBC4))
+
+#define XELPDP_PORT_BUF_CTL1(port)			_MMIO(_XELPDP_PORT_BUF_CTL1(port))
+#define  XELPDP_PORT_BUF_SOC_PHY_READY			REG_BIT(24)
+#define  XELPDP_PORT_REVERSAL				REG_BIT(16)
+
+#define  XELPDP_TC_PHY_OWNERSHIP			REG_BIT(6)
+#define  XELPDP_TCSS_POWER_REQUEST			REG_BIT(5)
+#define  XELPDP_TCSS_POWER_STATE			REG_BIT(4)
+#define  XELPDP_PORT_WIDTH_MASK				REG_GENMASK(3, 1)
+#define  XELPDP_PORT_WIDTH(val)				REG_FIELD_PREP(XELPDP_PORT_WIDTH_MASK, val)
+
+#define XELPDP_PORT_BUF_CTL2(port)			_MMIO(_XELPDP_PORT_BUF_CTL1(port) + 4)
+#define  XELPDP_LANE0_PIPE_RESET			REG_BIT(31)
+#define  XELPDP_LANE1_PIPE_RESET			REG_BIT(30)
+#define  XELPDP_LANE0_PHY_CURRENT_STATUS		REG_BIT(29)
+#define  XELPDP_LANE1_PHY_CURRENT_STATUS		REG_BIT(28)
+#define  XELPDP_LANE0_POWERDOWN_UPDATE			REG_BIT(25)
+#define  XELPDP_LANE1_POWERDOWN_UPDATE			REG_BIT(24)
+#define  XELPDP_LANE0_POWERDOWN_NEW_STATE_MASK		REG_GENMASK(23, 20)
+#define  XELPDP_LANE0_POWERDOWN_NEW_STATE(val)		REG_FIELD_PREP(XELPDP_LANE0_POWERDOWN_NEW_STATE_MASK, val)
+#define  XELPDP_LANE1_POWERDOWN_NEW_STATE_MASK		REG_GENMASK(19, 16)
+#define  XELPDP_LANE1_POWERDOWN_NEW_STATE(val)		REG_FIELD_PREP(XELPDP_LANE1_POWERDOWN_NEW_STATE_MASK, val)
+#define  XELPDP_POWER_STATE_READY_MASK			REG_GENMASK(7, 4)
+#define  XELPDP_POWER_STATE_READY(val)			REG_FIELD_PREP(XELPDP_POWER_STATE_READY_MASK, val)
+
+#define XELPDP_PORT_BUF_CTL3(port)			_MMIO(_XELPDP_PORT_BUF_CTL1(port) + 8)
+#define  XELPDP_PLL_LANE_STAGGERING_DELAY_MASK		REG_GENMASK(15, 8)
+#define  XELPDP_PLL_LANE_STAGGERING_DELAY(val)		REG_FIELD_PREP(XELPDP_PLL_LANE_STAGGERING_DELAY_MASK, val)
+#define  XELPDP_POWER_STATE_ACTIVE_MASK			REG_GENMASK(3, 0)
+#define  XELPDP_POWER_STATE_ACTIVE(val)			REG_FIELD_PREP(XELPDP_POWER_STATE_ACTIVE_MASK, val)
+
+#define _XELPDP_PORT_CLOCK_CTL_A			0x640E0
+#define _XELPDP_PORT_CLOCK_CTL_B			0x641E0
+#define _XELPDP_PORT_CLOCK_CTL_USBC1			0x16F260
+#define _XELPDP_PORT_CLOCK_CTL_USBC2			0x16F460
+#define _XELPDP_PORT_CLOCK_CTL_USBC3			0x16F660
+#define _XELPDP_PORT_CLOCK_CTL_USBC4			0x16F860
+#define XELPDP_PORT_CLOCK_CTL(port)			_MMIO(_PICK(port, \
+							[PORT_A] = _XELPDP_PORT_CLOCK_CTL_A, \
+							[PORT_B] = _XELPDP_PORT_CLOCK_CTL_B, \
+							[PORT_TC1] = _XELPDP_PORT_CLOCK_CTL_USBC1, \
+							[PORT_TC2] = _XELPDP_PORT_CLOCK_CTL_USBC2, \
+							[PORT_TC3] = _XELPDP_PORT_CLOCK_CTL_USBC3, \
+							[PORT_TC4] = _XELPDP_PORT_CLOCK_CTL_USBC4))
+
+#define XELPDP_LANE0_PCLK_PLL_REQUEST			REG_BIT(31)
+#define XELPDP_LANE0_PCLK_PLL_ACK			REG_BIT(30)
+#define XELPDP_LANE0_PCLK_REFCLK_REQUEST		REG_BIT(29)
+#define XELPDP_LANE0_PCLK_REFCLK_ACK			REG_BIT(28)
+#define XELPDP_LANE1_PCLK_PLL_REQUEST			REG_BIT(27)
+#define XELPDP_LANE1_PCLK_PLL_ACK			REG_BIT(26)
+#define XELPDP_LANE1_PCLK_REFCLK_REQUEST		REG_BIT(25)
+#define XELPDP_LANE1_PCLK_REFCLK_ACK			REG_BIT(24)
+#define XELPDP_TBT_CLOCK_REQUEST			REG_BIT(19)
+#define XELPDP_TBT_CLOCK_ACK				REG_BIT(18)
+#define XELPDP_DDI_CLOCK_SELECT_MASK			REG_GENMASK(15, 12)
+#define XELPDP_DDI_CLOCK_SELECT(val)			REG_FIELD_PREP(XELPDP_DDI_CLOCK_SELECT_MASK, val)
+#define XELPDP_DDI_CLOCK_SELECT_NONE			0x0
+#define XELPDP_DDI_CLOCK_SELECT_MAXPCLK			0x8
+#define XELPDP_DDI_CLOCK_SELECT_DIV18CLK		0x9
+#define XELPDP_DDI_CLOCK_SELECT_TBT_162			0xc
+#define XELPDP_DDI_CLOCK_SELECT_TBT_270			0xd
+#define XELPDP_DDI_CLOCK_SELECT_TBT_540			0xe
+#define XELPDP_DDI_CLOCK_SELECT_TBT_810			0xf
+#define XELPDP_FORWARD_CLOCK_UNGATE			REG_BIT(10)
+#define XELPDP_LANE1_PHY_CLOCK_SELECT			REG_BIT(8)
+#define XELPDP_SSC_ENABLE_PLLA				REG_BIT(1)
+#define XELPDP_SSC_ENABLE_PLLB				REG_BIT(0)
+
+#endif /* __INTEL_CX0_REG_DEFS_H__ */
