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diff --git a/plat/arm/css/common/css_topology.c b/plat/arm/css/common/css_topology.c
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+++ b/plat/arm/css/common/css_topology.c
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+/*
+ * Copyright (c) 2015, ARM Limited and Contributors. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * Redistributions of source code must retain the above copyright notice, this
+ * list of conditions and the following disclaimer.
+ *
+ * Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ *
+ * Neither the name of ARM nor the names of its contributors may be used
+ * to endorse or promote products derived from this software without specific
+ * prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <plat_arm.h>
+
+/*
+ * On ARM platforms, by default the cluster power level is treated as the
+ * highest. The first entry in the power domain descriptor specifies the
+ * number of cluster power domains i.e. 2.
+ */
+#define CSS_PWR_DOMAINS_AT_MAX_PWR_LVL	ARM_CLUSTER_COUNT
+
+/*
+ * The CSS power domain tree descriptor. The cluster power domains are
+ * arranged so that when the PSCI generic code creates the power domain tree,
+ * the indices of the CPU power domain nodes it allocates match the linear
+ * indices returned by plat_core_pos_by_mpidr() i.e.
+ * CLUSTER1 CPUs are allocated indices from 0 to 3 and the higher indices for
+ * CLUSTER0 CPUs.
+ */
+const unsigned char arm_power_domain_tree_desc[] = {
+	/* No of root nodes */
+	CSS_PWR_DOMAINS_AT_MAX_PWR_LVL,
+	/* No of children for the first node */
+	PLAT_ARM_CLUSTER1_CORE_COUNT,
+	/* No of children for the second node */
+	PLAT_ARM_CLUSTER0_CORE_COUNT
+};
+
+
+/******************************************************************************
+ * This function implements a part of the critical interface between the psci
+ * generic layer and the platform that allows the former to query the platform
+ * to convert an MPIDR to a unique linear index. An error code (-1) is
+ * returned in case the MPIDR is invalid.
+ *****************************************************************************/
+int plat_core_pos_by_mpidr(u_register_t mpidr)
+{
+	if (arm_check_mpidr(mpidr) == 0)
+		return plat_arm_calc_core_pos(mpidr);
+
+	return -1;
+}