diff --git a/plat/arm/board/common/aarch32/board_arm_helpers.S b/plat/arm/board/common/aarch32/board_arm_helpers.S
index 320bfb3..8c63693 100644
--- a/plat/arm/board/common/aarch32/board_arm_helpers.S
+++ b/plat/arm/board/common/aarch32/board_arm_helpers.S
@@ -6,7 +6,7 @@
 
 #include <asm_macros.S>
 #include <common/bl_common.h>
-#include <v2m_def.h>
+#include <platform_def.h>
 
 	.globl  plat_report_exception
 
diff --git a/plat/arm/board/common/aarch64/board_arm_helpers.S b/plat/arm/board/common/aarch64/board_arm_helpers.S
index 5a90524..cde6b00 100644
--- a/plat/arm/board/common/aarch64/board_arm_helpers.S
+++ b/plat/arm/board/common/aarch64/board_arm_helpers.S
@@ -6,7 +6,7 @@
 
 #include <asm_macros.S>
 #include <common/bl_common.h>
-#include <v2m_def.h>
+#include <platform_def.h>
 
 	.globl  plat_report_exception
 
diff --git a/plat/arm/board/common/board_arm_trusted_boot.c b/plat/arm/board/common/board_arm_trusted_boot.c
index 64ca3c3..e3c6805 100644
--- a/plat/arm/board/common/board_arm_trusted_boot.c
+++ b/plat/arm/board/common/board_arm_trusted_boot.c
@@ -11,8 +11,7 @@
 #include <lib/cassert.h>
 #include <plat/common/platform.h>
 #include <tools_share/tbbr_oid.h>
-
-#include <arm_def.h>
+#include <platform_def.h>
 
 /* SHA256 algorithm */
 #define SHA256_BYTES			32
diff --git a/plat/arm/board/fvp/aarch32/fvp_helpers.S b/plat/arm/board/fvp/aarch32/fvp_helpers.S
index 5d88546..f689557 100644
--- a/plat/arm/board/fvp/aarch32/fvp_helpers.S
+++ b/plat/arm/board/fvp/aarch32/fvp_helpers.S
@@ -7,8 +7,8 @@
 #include <arch.h>
 #include <asm_macros.S>
 #include <platform_def.h>
+
 #include "../drivers/pwrc/fvp_pwrc.h"
-#include "../fvp_def.h"
 
 	.globl	plat_secondary_cold_boot_setup
 	.globl	plat_get_my_entrypoint
diff --git a/plat/arm/board/fvp/aarch64/fvp_helpers.S b/plat/arm/board/fvp/aarch64/fvp_helpers.S
index 0f90515..02a3c7c 100644
--- a/plat/arm/board/fvp/aarch64/fvp_helpers.S
+++ b/plat/arm/board/fvp/aarch64/fvp_helpers.S
@@ -9,9 +9,8 @@
 #include <drivers/arm/gicv2.h>
 #include <drivers/arm/gicv3.h>
 #include <platform_def.h>
-#include <v2m_def.h>
+
 #include "../drivers/pwrc/fvp_pwrc.h"
-#include "../fvp_def.h"
 
 	.globl	plat_secondary_cold_boot_setup
 	.globl	plat_get_my_entrypoint
diff --git a/plat/arm/board/fvp/drivers/pwrc/fvp_pwrc.c b/plat/arm/board/fvp/drivers/pwrc/fvp_pwrc.c
index c48bb07..cae9827 100644
--- a/plat/arm/board/fvp/drivers/pwrc/fvp_pwrc.c
+++ b/plat/arm/board/fvp/drivers/pwrc/fvp_pwrc.c
@@ -6,10 +6,9 @@
 
 #include <lib/bakery_lock.h>
 #include <lib/mmio.h>
+#include <platform_def.h>
 
 #include <plat_arm.h>
-
-#include "../../fvp_def.h"
 #include "../../fvp_private.h"
 #include "fvp_pwrc.h"
 
diff --git a/plat/arm/board/fvp/fvp_bl2_setup.c b/plat/arm/board/fvp/fvp_bl2_setup.c
index 13e74fd..7aa620b 100644
--- a/plat/arm/board/fvp/fvp_bl2_setup.c
+++ b/plat/arm/board/fvp/fvp_bl2_setup.c
@@ -8,10 +8,9 @@
 #include <drivers/generic_delay_timer.h>
 #include <lib/mmio.h>
 #include <plat/common/platform.h>
+#include <platform_def.h>
 
 #include <plat_arm.h>
-#include <v2m_def.h>
-#include "fvp_def.h"
 #include "fvp_private.h"
 
 void bl2_early_platform_setup2(u_register_t arg0, u_register_t arg1, u_register_t arg2, u_register_t arg3)
diff --git a/plat/arm/board/fvp/fvp_bl2u_setup.c b/plat/arm/board/fvp/fvp_bl2u_setup.c
index c51e287..6367be6 100644
--- a/plat/arm/board/fvp/fvp_bl2u_setup.c
+++ b/plat/arm/board/fvp/fvp_bl2u_setup.c
@@ -5,9 +5,9 @@
  */
 
 #include <plat/common/platform.h>
+#include <platform_def.h>
 
 #include <plat_arm.h>
-#include "fvp_def.h"
 #include "fvp_private.h"
 
 void bl2u_early_platform_setup(struct meminfo *mem_layout, void *plat_info)
diff --git a/plat/arm/board/fvp/fvp_common.c b/plat/arm/board/fvp/fvp_common.c
index 31a61de..1a27fc4 100644
--- a/plat/arm/board/fvp/fvp_common.c
+++ b/plat/arm/board/fvp/fvp_common.c
@@ -13,15 +13,12 @@
 #include <lib/mmio.h>
 #include <lib/xlat_tables/xlat_tables_compat.h>
 #include <plat/common/platform.h>
+#include <platform_def.h>
 #include <services/secure_partition.h>
 
 #include <arm_config.h>
-#include <arm_def.h>
-#include <arm_spm_def.h>
 #include <plat_arm.h>
-#include <v2m_def.h>
 
-#include "../fvp_def.h"
 #include "fvp_private.h"
 
 /* Defines for GIC Driver build time selection */
diff --git a/plat/arm/board/fvp/fvp_pm.c b/plat/arm/board/fvp/fvp_pm.c
index 7da246b..8ba8281 100644
--- a/plat/arm/board/fvp/fvp_pm.c
+++ b/plat/arm/board/fvp/fvp_pm.c
@@ -14,14 +14,13 @@
 #include <lib/mmio.h>
 #include <lib/psci/psci.h>
 #include <plat/common/platform.h>
+#include <platform_def.h>
 
 #include <arm_config.h>
 #include <plat_arm.h>
-#include <v2m_def.h>
 
 #include "../../../../drivers/arm/gic/v3/gicv3_private.h"
 #include "drivers/pwrc/fvp_pwrc.h"
-#include "fvp_def.h"
 #include "fvp_private.h"
 
 
diff --git a/plat/arm/board/fvp/fvp_trusted_boot.c b/plat/arm/board/fvp/fvp_trusted_boot.c
index c18bfb2..0d160cb 100644
--- a/plat/arm/board/fvp/fvp_trusted_boot.c
+++ b/plat/arm/board/fvp/fvp_trusted_boot.c
@@ -9,10 +9,9 @@
 #include <string.h>
 
 #include <plat/common/platform.h>
+#include <platform_def.h>
 #include <tools_share/tbbr_oid.h>
 
-#include "fvp_def.h"
-
 /*
  * Store a new non-volatile counter value. On some FVP versions, the
  * non-volatile counters are RO. On these versions we expect the values in the
diff --git a/plat/arm/board/fvp/include/plat_macros.S b/plat/arm/board/fvp/include/plat_macros.S
index 6be8b09..57f5924 100644
--- a/plat/arm/board/fvp/include/plat_macros.S
+++ b/plat/arm/board/fvp/include/plat_macros.S
@@ -7,8 +7,7 @@
 #define PLAT_MACROS_S
 
 #include <arm_macros.S>
-#include <v2m_def.h>
-#include "../fvp_def.h"
+#include <platform_def.h>
 
 	/* ---------------------------------------------
 	 * The below required platform porting macro
diff --git a/plat/arm/board/juno/aarch32/juno_helpers.S b/plat/arm/board/juno/aarch32/juno_helpers.S
index 080a8dd..8f9561c 100644
--- a/plat/arm/board/juno/aarch32/juno_helpers.S
+++ b/plat/arm/board/juno/aarch32/juno_helpers.S
@@ -11,9 +11,7 @@
 #include <cortex_a57.h>
 #include <cortex_a72.h>
 #include <cpu_macros.S>
-#include <v2m_def.h>
-#include "../juno_def.h"
-
+#include <platform_def.h>
 
 	.globl	plat_reset_handler
 	.globl	plat_arm_calc_core_pos
diff --git a/plat/arm/board/juno/aarch64/juno_helpers.S b/plat/arm/board/juno/aarch64/juno_helpers.S
index 373f2fc..c94fa3e 100644
--- a/plat/arm/board/juno/aarch64/juno_helpers.S
+++ b/plat/arm/board/juno/aarch64/juno_helpers.S
@@ -11,10 +11,7 @@
 #include <cortex_a57.h>
 #include <cortex_a72.h>
 #include <cpu_macros.S>
-#include <css_def.h>
-#include <v2m_def.h>
-#include "../juno_def.h"
-
+#include <platform_def.h>
 
 	.globl	plat_reset_handler
 	.globl	plat_arm_calc_core_pos
diff --git a/plat/arm/board/juno/juno_bl1_setup.c b/plat/arm/board/juno/juno_bl1_setup.c
index e751ab6..383409d 100644
--- a/plat/arm/board/juno/juno_bl1_setup.c
+++ b/plat/arm/board/juno/juno_bl1_setup.c
@@ -11,10 +11,10 @@
 #include <common/tbbr/tbbr_img_def.h>
 #include <drivers/arm/sp805.h>
 #include <plat/common/platform.h>
+#include <platform_def.h>
 
 #include <plat_arm.h>
 #include <sds.h>
-#include <v2m_def.h>
 
 void juno_reset_to_aarch32_state(void);
 
diff --git a/plat/arm/board/juno/juno_common.c b/plat/arm/board/juno/juno_common.c
index 2e6b011..e134108 100644
--- a/plat/arm/board/juno/juno_common.c
+++ b/plat/arm/board/juno/juno_common.c
@@ -3,7 +3,8 @@
  *
  * SPDX-License-Identifier: BSD-3-Clause
  */
-#include <arm_def.h>
+
+#include <platform_def.h>
 #include <plat_arm.h>
 
 /*
diff --git a/plat/arm/board/juno/juno_err.c b/plat/arm/board/juno/juno_err.c
index 69daa1a..f80ff24 100644
--- a/plat/arm/board/juno/juno_err.c
+++ b/plat/arm/board/juno/juno_err.c
@@ -8,8 +8,7 @@
 
 #include <arch_helpers.h>
 #include <plat/common/platform.h>
-
-#include <v2m_def.h>
+#include <platform_def.h>
 
 /*
  * Juno error handler
diff --git a/plat/arm/board/juno/juno_security.c b/plat/arm/board/juno/juno_security.c
index b0df837..51c8669 100644
--- a/plat/arm/board/juno/juno_security.c
+++ b/plat/arm/board/juno/juno_security.c
@@ -7,10 +7,10 @@
 #include <common/debug.h>
 #include <drivers/arm/nic_400.h>
 #include <lib/mmio.h>
+#include <platform_def.h>
 
 #include <plat_arm.h>
 #include <soc_css.h>
-#include "juno_def.h"
 #include "juno_tzmp1_def.h"
 
 #ifdef JUNO_TZMP1
diff --git a/plat/arm/board/juno/juno_stack_protector.c b/plat/arm/board/juno/juno_stack_protector.c
index ff05b5d..236eb5b 100644
--- a/plat/arm/board/juno/juno_stack_protector.c
+++ b/plat/arm/board/juno/juno_stack_protector.c
@@ -7,9 +7,9 @@
 #include <arch_helpers.h>
 #include <common/debug.h>
 #include <lib/utils.h>
+#include <platform_def.h>
 
 #include "juno_decl.h"
-#include "juno_def.h"
 
 u_register_t plat_get_stack_protector_canary(void)
 {
diff --git a/plat/arm/board/juno/juno_topology.c b/plat/arm/board/juno/juno_topology.c
index 51b99ac..e70cbdc 100644
--- a/plat/arm/board/juno/juno_topology.c
+++ b/plat/arm/board/juno/juno_topology.c
@@ -5,11 +5,10 @@
  */
 
 #include <plat/common/platform.h>
+#include <platform_def.h>
 
-#include <arm_def.h>
 #include <css_pm.h>
 #include <plat_arm.h>
-#include "juno_def.h"
 #include "../../css/drivers/scmi/scmi.h"
 #include "../../css/drivers/mhu/css_mhu_doorbell.h"
 
diff --git a/plat/arm/board/juno/juno_trng.c b/plat/arm/board/juno/juno_trng.c
index 505fb02..7869d3e 100644
--- a/plat/arm/board/juno/juno_trng.c
+++ b/plat/arm/board/juno/juno_trng.c
@@ -9,9 +9,9 @@
 
 #include <lib/mmio.h>
 #include <lib/utils_def.h>
+#include <platform_def.h>
 
 #include "juno_decl.h"
-#include "juno_def.h"
 
 #define NSAMPLE_CLOCKS	1 /* min 1 cycle, max 231 cycles */
 #define NRETRIES	5
diff --git a/plat/arm/board/juno/juno_tzmp1_def.h b/plat/arm/board/juno/juno_tzmp1_def.h
index 5d0978c..4186d02 100644
--- a/plat/arm/board/juno/juno_tzmp1_def.h
+++ b/plat/arm/board/juno/juno_tzmp1_def.h
@@ -7,8 +7,6 @@
 #ifndef JUNO_TZMP1_DEF_H
 #define JUNO_TZMP1_DEF_H
 
-#include <plat_arm.h>
-
 /*
  * Public memory regions for both protected and non-protected mode
  *
diff --git a/plat/arm/board/n1sdp/include/platform_def.h b/plat/arm/board/n1sdp/include/platform_def.h
index 1556ac7..68d0f93 100644
--- a/plat/arm/board/n1sdp/include/platform_def.h
+++ b/plat/arm/board/n1sdp/include/platform_def.h
@@ -9,6 +9,7 @@
 
 #include <arm_def.h>
 #include <css_def.h>
+#include <v2m_def.h>
 
 /* UART related constants */
 #define PLAT_ARM_BOOT_UART_BASE			0x2A400000
diff --git a/plat/arm/board/n1sdp/n1sdp_plat.c b/plat/arm/board/n1sdp/n1sdp_plat.c
index 3bf1fe6..87e1511 100644
--- a/plat/arm/board/n1sdp/n1sdp_plat.c
+++ b/plat/arm/board/n1sdp/n1sdp_plat.c
@@ -10,7 +10,6 @@
 #include <common/debug.h>
 #include <plat/common/platform.h>
 
-#include <arm_def.h>
 #include <plat_arm.h>
 
 /*
diff --git a/plat/arm/common/arm_bl1_setup.c b/plat/arm/common/arm_bl1_setup.c
index e28211c..73fee60 100644
--- a/plat/arm/common/arm_bl1_setup.c
+++ b/plat/arm/common/arm_bl1_setup.c
@@ -16,7 +16,6 @@
 #include <lib/xlat_tables/xlat_tables_compat.h>
 #include <plat/common/platform.h>
 
-#include <arm_def.h>
 #include <plat_arm.h>
 
 #include "../../../bl1/bl1_private.h"
diff --git a/plat/arm/common/arm_bl2_el3_setup.c b/plat/arm/common/arm_bl2_el3_setup.c
index 0c1f63e..c38f2ec 100644
--- a/plat/arm/common/arm_bl2_el3_setup.c
+++ b/plat/arm/common/arm_bl2_el3_setup.c
@@ -8,8 +8,8 @@
 
 #include <drivers/generic_delay_timer.h>
 #include <plat/common/platform.h>
+#include <platform_def.h>
 
-#include <arm_def.h>
 #include <plat_arm.h>
 
 #pragma weak bl2_el3_early_platform_setup
diff --git a/plat/arm/common/arm_bl2_setup.c b/plat/arm/common/arm_bl2_setup.c
index 9319004..b661eb1 100644
--- a/plat/arm/common/arm_bl2_setup.c
+++ b/plat/arm/common/arm_bl2_setup.c
@@ -20,7 +20,6 @@
 #include <lib/utils.h>
 #include <plat/common/platform.h>
 
-#include <arm_def.h>
 #include <plat_arm.h>
 
 /* Data structure which holds the extents of the trusted SRAM for BL2 */
diff --git a/plat/arm/common/arm_bl2u_setup.c b/plat/arm/common/arm_bl2u_setup.c
index 0dc66e6..332ed14 100644
--- a/plat/arm/common/arm_bl2u_setup.c
+++ b/plat/arm/common/arm_bl2u_setup.c
@@ -14,7 +14,6 @@
 #include <drivers/generic_delay_timer.h>
 #include <plat/common/platform.h>
 
-#include <arm_def.h>
 #include <plat_arm.h>
 
 /* Weak definitions may be overridden in specific ARM standard platform */
diff --git a/plat/arm/common/arm_bl31_setup.c b/plat/arm/common/arm_bl31_setup.c
index 41151c2..dacefc4 100644
--- a/plat/arm/common/arm_bl31_setup.c
+++ b/plat/arm/common/arm_bl31_setup.c
@@ -16,8 +16,8 @@
 #include <lib/utils.h>
 #include <lib/xlat_tables/xlat_tables_compat.h>
 #include <plat/common/platform.h>
+#include <platform_def.h>
 
-#include <arm_def.h>
 #include <plat_arm.h>
 
 /*
diff --git a/plat/arm/common/arm_gicv3.c b/plat/arm/common/arm_gicv3.c
index 0f6690a..e3cee3a 100644
--- a/plat/arm/common/arm_gicv3.c
+++ b/plat/arm/common/arm_gicv3.c
@@ -11,7 +11,6 @@
 #include <lib/utils.h>
 #include <plat/common/platform.h>
 
-#include <arm_def.h>
 #include <plat_arm.h>
 
 /******************************************************************************
diff --git a/plat/arm/common/arm_image_load.c b/plat/arm/common/arm_image_load.c
index 791f05e..bf1fbfd 100644
--- a/plat/arm/common/arm_image_load.c
+++ b/plat/arm/common/arm_image_load.c
@@ -8,7 +8,6 @@
 #include <common/desc_image_load.h>
 #include <plat/common/platform.h>
 
-#include <arm_def.h>
 #include <plat_arm.h>
 
 #pragma weak plat_flush_next_bl_params
diff --git a/plat/arm/common/arm_pm.c b/plat/arm/common/arm_pm.c
index acfd908..4ce13aa 100644
--- a/plat/arm/common/arm_pm.c
+++ b/plat/arm/common/arm_pm.c
@@ -13,7 +13,6 @@
 #include <lib/psci/psci.h>
 #include <plat/common/platform.h>
 
-#include <arm_def.h>
 #include <plat_arm.h>
 
 /* Allow ARM Standard platforms to override these functions */
diff --git a/plat/arm/common/arm_tzc400.c b/plat/arm/common/arm_tzc400.c
index 0346fa1..322713b 100644
--- a/plat/arm/common/arm_tzc400.c
+++ b/plat/arm/common/arm_tzc400.c
@@ -9,8 +9,6 @@
 #include <common/debug.h>
 #include <drivers/arm/tzc400.h>
 
-#include <arm_def.h>
-#include <arm_spm_def.h>
 #include <plat_arm.h>
 
 /* Weak definitions may be overridden in specific ARM standard platform */
diff --git a/plat/arm/common/arm_tzc_dmc500.c b/plat/arm/common/arm_tzc_dmc500.c
index bea3867..07260a7 100644
--- a/plat/arm/common/arm_tzc_dmc500.c
+++ b/plat/arm/common/arm_tzc_dmc500.c
@@ -11,7 +11,6 @@
 #include <common/debug.h>
 #include <drivers/arm/tzc_dmc500.h>
 
-#include <arm_def.h>
 #include <plat_arm.h>
 
 /*******************************************************************************
diff --git a/plat/arm/common/tsp/arm_tsp_setup.c b/plat/arm/common/tsp/arm_tsp_setup.c
index a3d2f71..0f2827d 100644
--- a/plat/arm/common/tsp/arm_tsp_setup.c
+++ b/plat/arm/common/tsp/arm_tsp_setup.c
@@ -14,7 +14,6 @@
 #include <drivers/arm/pl011.h>
 #include <drivers/console.h>
 
-#include <arm_def.h>
 #include <plat_arm.h>
 
 #define BL32_END (unsigned long)(&__BL32_END__)
diff --git a/plat/arm/css/common/aarch32/css_helpers.S b/plat/arm/css/common/aarch32/css_helpers.S
index 80aa24c..d47e13d 100644
--- a/plat/arm/css/common/aarch32/css_helpers.S
+++ b/plat/arm/css/common/aarch32/css_helpers.S
@@ -3,10 +3,11 @@
  *
  * SPDX-License-Identifier: BSD-3-Clause
  */
+
 #include <arch.h>
 #include <asm_macros.S>
 #include <cpu_macros.S>
-#include <css_def.h>
+#include <platform_def.h>
 
 	.weak	plat_secondary_cold_boot_setup
 	.weak	plat_get_my_entrypoint
diff --git a/plat/arm/css/common/aarch64/css_helpers.S b/plat/arm/css/common/aarch64/css_helpers.S
index 5096d8d..01669be 100644
--- a/plat/arm/css/common/aarch64/css_helpers.S
+++ b/plat/arm/css/common/aarch64/css_helpers.S
@@ -3,10 +3,11 @@
  *
  * SPDX-License-Identifier: BSD-3-Clause
  */
+
 #include <arch.h>
 #include <asm_macros.S>
 #include <cpu_macros.S>
-#include <css_def.h>
+#include <platform_def.h>
 
 	.weak	plat_secondary_cold_boot_setup
 	.weak	plat_get_my_entrypoint
diff --git a/plat/arm/css/common/css_bl2_setup.c b/plat/arm/css/common/css_bl2_setup.c
index c1c7868..6aefe03 100644
--- a/plat/arm/css/common/css_bl2_setup.c
+++ b/plat/arm/css/common/css_bl2_setup.c
@@ -10,8 +10,8 @@
 #include <common/debug.h>
 #include <lib/mmio.h>
 #include <lib/utils.h>
+#include <platform_def.h>
 
-#include <css_def.h>
 #include <plat_arm.h>
 
 #include "../drivers/scp/css_scp.h"
diff --git a/plat/arm/css/drivers/mhu/css_mhu.c b/plat/arm/css/drivers/mhu/css_mhu.c
index e13818f..981df9c 100644
--- a/plat/arm/css/drivers/mhu/css_mhu.c
+++ b/plat/arm/css/drivers/mhu/css_mhu.c
@@ -12,7 +12,6 @@
 #include <lib/bakery_lock.h>
 #include <lib/mmio.h>
 
-#include <css_def.h>
 #include <plat_arm.h>
 
 #include "css_mhu.h"
diff --git a/plat/arm/css/drivers/scp/css_bom_bootloader.c b/plat/arm/css/drivers/scp/css_bom_bootloader.c
index 27c9e1d..ca40c30 100644
--- a/plat/arm/css/drivers/scp/css_bom_bootloader.c
+++ b/plat/arm/css/drivers/scp/css_bom_bootloader.c
@@ -10,8 +10,7 @@
 #include <arch_helpers.h>
 #include <common/debug.h>
 #include <plat/common/platform.h>
-
-#include <css_def.h>
+#include <platform_def.h>
 
 #include "../mhu/css_mhu.h"
 #include "../scpi/css_scpi.h"
diff --git a/plat/arm/css/drivers/scp/css_pm_scmi.c b/plat/arm/css/drivers/scp/css_pm_scmi.c
index bd6b595..fa4dd8a 100644
--- a/plat/arm/css/drivers/scp/css_pm_scmi.c
+++ b/plat/arm/css/drivers/scp/css_pm_scmi.c
@@ -10,8 +10,8 @@
 #include <arch_helpers.h>
 #include <common/debug.h>
 #include <plat/common/platform.h>
+#include <platform_def.h>
 
-#include <css_def.h>
 #include <css_pm.h>
 #include <plat_arm.h>
 
diff --git a/plat/arm/css/drivers/scp/css_sds.c b/plat/arm/css/drivers/scp/css_sds.c
index c152abc..e3f6102 100644
--- a/plat/arm/css/drivers/scp/css_sds.c
+++ b/plat/arm/css/drivers/scp/css_sds.c
@@ -11,8 +11,7 @@
 #include <common/debug.h>
 #include <drivers/delay_timer.h>
 #include <plat/common/platform.h>
-
-#include <css_def.h>
+#include <platform_def.h>
 
 #include "css_scp.h"
 #include "../sds/sds.h"
diff --git a/plat/arm/css/drivers/scpi/css_scpi.c b/plat/arm/css/drivers/scpi/css_scpi.c
index 42bf3b8..d64bfa2 100644
--- a/plat/arm/css/drivers/scpi/css_scpi.c
+++ b/plat/arm/css/drivers/scpi/css_scpi.c
@@ -11,8 +11,7 @@
 #include <common/debug.h>
 #include <lib/utils.h>
 #include <plat/common/platform.h>
-
-#include <css_def.h>
+#include <platform_def.h>
 
 #include "../mhu/css_mhu.h"
 #include "css_scpi.h"
diff --git a/plat/arm/css/drivers/sds/sds.c b/plat/arm/css/drivers/sds/sds.c
index 3eeb0dc..eb2f48e 100644
--- a/plat/arm/css/drivers/sds/sds.c
+++ b/plat/arm/css/drivers/sds/sds.c
@@ -10,8 +10,8 @@
 
 #include <arch_helpers.h>
 #include <common/debug.h>
+#include <platform_def.h>
 
-#include <css_def.h>
 #include "sds.h"
 #include "sds_private.h"
 
diff --git a/plat/arm/css/sgi/sgi_plat.c b/plat/arm/css/sgi/sgi_plat.c
index 79f3e5b..387be36 100644
--- a/plat/arm/css/sgi/sgi_plat.c
+++ b/plat/arm/css/sgi/sgi_plat.c
@@ -14,8 +14,6 @@
 #include <plat/common/platform.h>
 #include <services/secure_partition.h>
 
-#include <arm_def.h>
-#include <arm_spm_def.h>
 #include <plat_arm.h>
 #include "../../../../bl1/bl1_private.h"
 
diff --git a/plat/arm/css/sgm/sgm_mmap_config.c b/plat/arm/css/sgm/sgm_mmap_config.c
index a4df9ab..763f36a 100644
--- a/plat/arm/css/sgm/sgm_mmap_config.c
+++ b/plat/arm/css/sgm/sgm_mmap_config.c
@@ -9,7 +9,6 @@
 #include <common/bl_common.h>
 #include <common/debug.h>
 
-#include <arm_def.h>
 #include <plat_arm.h>
 #include <sgm_variant.h>
 
diff --git a/plat/arm/soc/common/soc_css_security.c b/plat/arm/soc/common/soc_css_security.c
index bbc5dcd..b48357a 100644
--- a/plat/arm/soc/common/soc_css_security.c
+++ b/plat/arm/soc/common/soc_css_security.c
@@ -9,9 +9,7 @@
 #include <drivers/arm/nic_400.h>
 #include <lib/mmio.h>
 
-#include <board_css_def.h>
 #include <soc_css.h>
-#include <soc_css_def.h>
 
 void soc_css_init_nic400(void)
 {