diff --git a/plat/arm/css/common/css_bl1_setup.c b/plat/arm/css/common/css_bl1_setup.c
index ae0f011..596cc3d 100644
--- a/plat/arm/css/common/css_bl1_setup.c
+++ b/plat/arm/css/common/css_bl1_setup.c
@@ -6,11 +6,10 @@
 
 #include <common/bl_common.h>
 #include <common/debug.h>
+#include <plat/arm/common/plat_arm.h>
+#include <plat/arm/soc/common/soc_css.h>
 #include <plat/common/platform.h>
 
-#include <plat_arm.h>
-#include <soc_css.h>
-
 void bl1_platform_setup(void)
 {
 	arm_bl1_platform_setup();
diff --git a/plat/arm/css/common/css_bl2_setup.c b/plat/arm/css/common/css_bl2_setup.c
index 6aefe03..1538e29 100644
--- a/plat/arm/css/common/css_bl2_setup.c
+++ b/plat/arm/css/common/css_bl2_setup.c
@@ -10,10 +10,9 @@
 #include <common/debug.h>
 #include <lib/mmio.h>
 #include <lib/utils.h>
+#include <plat/arm/common/plat_arm.h>
 #include <platform_def.h>
 
-#include <plat_arm.h>
-
 #include "../drivers/scp/css_scp.h"
 
 /* Weak definition may be overridden in specific CSS based platform */
diff --git a/plat/arm/css/common/css_bl2u_setup.c b/plat/arm/css/common/css_bl2u_setup.c
index 564e98f..c3b4f2b 100644
--- a/plat/arm/css/common/css_bl2u_setup.c
+++ b/plat/arm/css/common/css_bl2u_setup.c
@@ -6,10 +6,9 @@
 
 #include <common/bl_common.h>
 #include <common/debug.h>
+#include <plat/arm/common/plat_arm.h>
 #include <plat/common/platform.h>
 
-#include <plat_arm.h>
-
 #include "../drivers/scp/css_scp.h"
 
 /* Weak definition may be overridden in specific CSS based platform */
diff --git a/plat/arm/css/common/css_common.mk b/plat/arm/css/common/css_common.mk
index ca1edab..0795306 100644
--- a/plat/arm/css/common/css_common.mk
+++ b/plat/arm/css/common/css_common.mk
@@ -11,8 +11,7 @@
 # By default, SCMI driver is disabled for CSS platforms
 CSS_USE_SCMI_SDS_DRIVER	?=	0
 
-PLAT_INCLUDES		+=	-Iinclude/plat/arm/css/common			\
-				-Iinclude/plat/arm/css/common/aarch64
+PLAT_INCLUDES		+=	-Iinclude/plat/arm/css/common/aarch64
 
 
 PLAT_BL_COMMON_SOURCES	+=	plat/arm/css/common/${ARCH}/css_helpers.S
diff --git a/plat/arm/css/common/css_pm.c b/plat/arm/css/common/css_pm.c
index 8a156e6..47412df 100644
--- a/plat/arm/css/common/css_pm.c
+++ b/plat/arm/css/common/css_pm.c
@@ -12,11 +12,10 @@
 #include <arch_helpers.h>
 #include <common/debug.h>
 #include <lib/cassert.h>
+#include <plat/arm/common/plat_arm.h>
+#include <plat/arm/css/common/css_pm.h>
 #include <plat/common/platform.h>
 
-#include <css_pm.h>
-#include <plat_arm.h>
-
 #include "../drivers/scp/css_scp.h"
 
 /* Allow CSS platforms to override `plat_arm_psci_pm_ops` */
diff --git a/plat/arm/css/common/css_topology.c b/plat/arm/css/common/css_topology.c
index 8ac2232..8aca744 100644
--- a/plat/arm/css/common/css_topology.c
+++ b/plat/arm/css/common/css_topology.c
@@ -6,10 +6,9 @@
 
 #include <assert.h>
 
+#include <plat/arm/common/plat_arm.h>
 #include <plat/common/platform.h>
 
-#include <plat_arm.h>
-
 #if ARM_PLAT_MT
 #pragma weak plat_arm_get_cpu_pe_count
 #endif
diff --git a/plat/arm/css/drivers/mhu/css_mhu.c b/plat/arm/css/drivers/mhu/css_mhu.c
index 981df9c..65695d8 100644
--- a/plat/arm/css/drivers/mhu/css_mhu.c
+++ b/plat/arm/css/drivers/mhu/css_mhu.c
@@ -11,8 +11,7 @@
 #include <arch_helpers.h>
 #include <lib/bakery_lock.h>
 #include <lib/mmio.h>
-
-#include <plat_arm.h>
+#include <plat/arm/common/plat_arm.h>
 
 #include "css_mhu.h"
 
diff --git a/plat/arm/css/drivers/scp/css_pm_scmi.c b/plat/arm/css/drivers/scp/css_pm_scmi.c
index fa4dd8a..ab9f5f5 100644
--- a/plat/arm/css/drivers/scp/css_pm_scmi.c
+++ b/plat/arm/css/drivers/scp/css_pm_scmi.c
@@ -9,12 +9,11 @@
 
 #include <arch_helpers.h>
 #include <common/debug.h>
+#include <plat/arm/common/plat_arm.h>
+#include <plat/arm/css/common/css_pm.h>
 #include <plat/common/platform.h>
 #include <platform_def.h>
 
-#include <css_pm.h>
-#include <plat_arm.h>
-
 #include "../scmi/scmi.h"
 #include "css_scp.h"
 
diff --git a/plat/arm/css/drivers/scp/css_pm_scpi.c b/plat/arm/css/drivers/scp/css_pm_scpi.c
index f53ac30..04c5f9b 100644
--- a/plat/arm/css/drivers/scp/css_pm_scpi.c
+++ b/plat/arm/css/drivers/scp/css_pm_scpi.c
@@ -8,9 +8,8 @@
 
 #include <arch_helpers.h>
 #include <common/debug.h>
-
-#include <css_pm.h>
-#include <plat_arm.h>
+#include <plat/arm/common/plat_arm.h>
+#include <plat/arm/css/common/css_pm.h>
 
 #include "../scpi/css_scpi.h"
 #include "css_scp.h"
diff --git a/plat/arm/css/sgi/include/sgi_base_platform_def.h b/plat/arm/css/sgi/include/sgi_base_platform_def.h
index 4afaae1..c0e6555 100644
--- a/plat/arm/css/sgi/include/sgi_base_platform_def.h
+++ b/plat/arm/css/sgi/include/sgi_base_platform_def.h
@@ -9,15 +9,14 @@
 
 #include <lib/utils_def.h>
 #include <lib/xlat_tables/xlat_tables_defs.h>
+#include <plat/arm/board/common/board_css_def.h>
+#include <plat/arm/board/common/v2m_def.h>
+#include <plat/arm/common/arm_def.h>
+#include <plat/arm/common/arm_spm_def.h>
+#include <plat/arm/css/common/css_def.h>
+#include <plat/arm/soc/common/soc_css_def.h>
 #include <plat/common/common_def.h>
 
-#include <arm_def.h>
-#include <arm_spm_def.h>
-#include <board_css_def.h>
-#include <css_def.h>
-#include <soc_css_def.h>
-#include <v2m_def.h>
-
 #define PLATFORM_CORE_COUNT		(PLAT_ARM_CLUSTER_COUNT *	\
 					CSS_SGI_MAX_CPUS_PER_CLUSTER * \
 					CSS_SGI_MAX_PE_PER_CPU)
diff --git a/plat/arm/css/sgi/sgi_bl31_setup.c b/plat/arm/css/sgi/sgi_bl31_setup.c
index 617a62b..5324482 100644
--- a/plat/arm/css/sgi/sgi_bl31_setup.c
+++ b/plat/arm/css/sgi/sgi_bl31_setup.c
@@ -10,8 +10,8 @@
 
 #include <common/bl_common.h>
 #include <common/debug.h>
+#include <plat/arm/common/plat_arm.h>
 
-#include <plat_arm.h>
 #include <sgi_ras.h>
 #include <sgi_variant.h>
 
diff --git a/plat/arm/css/sgi/sgi_image_load.c b/plat/arm/css/sgi/sgi_image_load.c
index e52124f..a2f10dc 100644
--- a/plat/arm/css/sgi/sgi_image_load.c
+++ b/plat/arm/css/sgi/sgi_image_load.c
@@ -9,9 +9,9 @@
 #include <arch_helpers.h>
 #include <common/debug.h>
 #include <common/desc_image_load.h>
+#include <plat/arm/common/plat_arm.h>
 #include <plat/common/platform.h>
 
-#include <plat_arm.h>
 #include <sgi_variant.h>
 
 /*******************************************************************************
diff --git a/plat/arm/css/sgi/sgi_plat.c b/plat/arm/css/sgi/sgi_plat.c
index 72cda7f..83ca30c 100644
--- a/plat/arm/css/sgi/sgi_plat.c
+++ b/plat/arm/css/sgi/sgi_plat.c
@@ -11,11 +11,10 @@
 #include <common/bl_common.h>
 #include <common/debug.h>
 #include <drivers/arm/ccn.h>
+#include <plat/arm/common/plat_arm.h>
 #include <plat/common/platform.h>
 #include <services/secure_partition.h>
 
-#include <plat_arm.h>
-
 #if USE_COHERENT_MEM
 /*
  * The next 2 constants identify the extents of the coherent memory region.
diff --git a/plat/arm/css/sgi/sgi_ras.c b/plat/arm/css/sgi/sgi_ras.c
index a6a32d1..0001ffd 100644
--- a/plat/arm/css/sgi/sgi_ras.c
+++ b/plat/arm/css/sgi/sgi_ras.c
@@ -10,12 +10,12 @@
 #include <bl31/interrupt_mgmt.h>
 #include <lib/el3_runtime/context_mgmt.h>
 #include <lib/extensions/ras.h>
+#include <plat/arm/common/arm_spm_def.h>
 #include <plat/common/platform.h>
 #include <services/mm_svc.h>
 #include <services/sdei.h>
 #include <services/spm_svc.h>
 
-#include <arm_spm_def.h>
 #include <sgi_ras.h>
 
 static int sgi_ras_intr_handler(const struct err_record_info *err_rec,
diff --git a/plat/arm/css/sgi/sgi_topology.c b/plat/arm/css/sgi/sgi_topology.c
index 2921c0c..dafaf40 100644
--- a/plat/arm/css/sgi/sgi_topology.c
+++ b/plat/arm/css/sgi/sgi_topology.c
@@ -4,7 +4,8 @@
  * SPDX-License-Identifier: BSD-3-Clause
  */
 
-#include <plat_arm.h>
+#include <plat/arm/common/plat_arm.h>
+
 #include <sgi_variant.h>
 
 /* Topology */
diff --git a/plat/arm/css/sgm/include/platform_oid.h b/plat/arm/css/sgm/include/platform_oid.h
index 18d41e3..fd1854a 100644
--- a/plat/arm/css/sgm/include/platform_oid.h
+++ b/plat/arm/css/sgm/include/platform_oid.h
@@ -3,7 +3,8 @@
  *
  * SPDX-License-Identifier: BSD-3-Clause
  */
-#include "../../../../../include/plat/arm/board/common/board_arm_oid.h"
+
+#include <plat/arm/board/common/board_arm_oid.h>
 
 /*
  * Required platform OIDs
diff --git a/plat/arm/css/sgm/include/sgm_base_platform_def.h b/plat/arm/css/sgm/include/sgm_base_platform_def.h
index e3fa3f3..4647e74 100644
--- a/plat/arm/css/sgm/include/sgm_base_platform_def.h
+++ b/plat/arm/css/sgm/include/sgm_base_platform_def.h
@@ -9,14 +9,13 @@
 
 #include <drivers/arm/tzc400.h>
 #include <drivers/arm/tzc_common.h>
+#include <plat/arm/board/common/board_css_def.h>
+#include <plat/arm/board/common/v2m_def.h>
+#include <plat/arm/common/arm_def.h>
+#include <plat/arm/css/common/css_def.h>
+#include <plat/arm/soc/common/soc_css_def.h>
 #include <plat/common/common_def.h>
 
-#include <arm_def.h>
-#include <board_css_def.h>
-#include <css_def.h>
-#include <soc_css_def.h>
-#include <v2m_def.h>
-
 /* CPU topology */
 #define PLAT_ARM_CLUSTER_COUNT		1
 #define PLAT_ARM_CLUSTER_CORE_COUNT	8
diff --git a/plat/arm/css/sgm/sgm_bl1_setup.c b/plat/arm/css/sgm/sgm_bl1_setup.c
index 8b7c5da..2036515 100644
--- a/plat/arm/css/sgm/sgm_bl1_setup.c
+++ b/plat/arm/css/sgm/sgm_bl1_setup.c
@@ -6,10 +6,10 @@
 
 #include <common/bl_common.h>
 #include <common/debug.h>
+#include <plat/arm/common/plat_arm.h>
+#include <plat/arm/soc/common/soc_css.h>
 
-#include <plat_arm.h>
 #include <sgm_plat_config.h>
-#include <soc_css.h>
 
 void bl1_early_platform_setup(void)
 {
diff --git a/plat/arm/css/sgm/sgm_bl31_setup.c b/plat/arm/css/sgm/sgm_bl31_setup.c
index 7967cb5..03d88e8 100644
--- a/plat/arm/css/sgm/sgm_bl31_setup.c
+++ b/plat/arm/css/sgm/sgm_bl31_setup.c
@@ -6,10 +6,9 @@
 
 #include <common/bl_common.h>
 #include <common/debug.h>
+#include <plat/arm/common/plat_arm.h>
 
-#include <plat_arm.h>
 #include <sgm_plat_config.h>
-
 #include "../../css/drivers/scmi/scmi.h"
 #include "../../css/drivers/mhu/css_mhu_doorbell.h"
 
diff --git a/plat/arm/css/sgm/sgm_mmap_config.c b/plat/arm/css/sgm/sgm_mmap_config.c
index 763f36a..e5b4b03 100644
--- a/plat/arm/css/sgm/sgm_mmap_config.c
+++ b/plat/arm/css/sgm/sgm_mmap_config.c
@@ -8,8 +8,8 @@
 
 #include <common/bl_common.h>
 #include <common/debug.h>
+#include <plat/arm/common/plat_arm.h>
 
-#include <plat_arm.h>
 #include <sgm_variant.h>
 
 /*
diff --git a/plat/arm/css/sgm/sgm_plat_config.c b/plat/arm/css/sgm/sgm_plat_config.c
index 2a43487..d9e65c5 100644
--- a/plat/arm/css/sgm/sgm_plat_config.c
+++ b/plat/arm/css/sgm/sgm_plat_config.c
@@ -10,8 +10,8 @@
 #include <platform_def.h>
 
 #include <common/debug.h>
+#include <plat/arm/common/plat_arm.h>
 
-#include <plat_arm.h>
 #include <sgm_plat_config.h>
 #include <sgm_variant.h>
 
diff --git a/plat/arm/css/sgm/sgm_security.c b/plat/arm/css/sgm/sgm_security.c
index 548ec7b..21d5306 100644
--- a/plat/arm/css/sgm/sgm_security.c
+++ b/plat/arm/css/sgm/sgm_security.c
@@ -6,10 +6,10 @@
 
 #include <common/debug.h>
 #include <drivers/arm/tzc_dmc500.h>
+#include <plat/arm/common/plat_arm.h>
+#include <plat/arm/soc/common/soc_css.h>
 
-#include <plat_arm.h>
 #include <sgm_variant.h>
-#include <soc_css.h>
 
 /* Is populated with the DMC-500 controllers base addresses */
 static tzc_dmc500_driver_data_t plat_driver_data;
diff --git a/plat/arm/css/sgm/sgm_topology.c b/plat/arm/css/sgm/sgm_topology.c
index ce72464..2d9552d 100644
--- a/plat/arm/css/sgm/sgm_topology.c
+++ b/plat/arm/css/sgm/sgm_topology.c
@@ -4,7 +4,8 @@
  * SPDX-License-Identifier: BSD-3-Clause
  */
 
-#include <plat_arm.h>
+#include <plat/arm/common/plat_arm.h>
+
 #include <sgm_plat_config.h>
 
 /*******************************************************************************
diff --git a/plat/arm/css/sgm/tsp/sgm_tsp_setup.c b/plat/arm/css/sgm/tsp/sgm_tsp_setup.c
index 39bba94..5f40c4c 100644
--- a/plat/arm/css/sgm/tsp/sgm_tsp_setup.c
+++ b/plat/arm/css/sgm/tsp/sgm_tsp_setup.c
@@ -4,7 +4,8 @@
  * SPDX-License-Identifier: BSD-3-Clause
  */
 
-#include <plat_arm.h>
+#include <plat/arm/common/plat_arm.h>
+
 #include <sgm_plat_config.h>
 
 void tsp_early_platform_setup(void)