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diff --git a/src/soc/intel/apollolake/chip.h b/src/soc/intel/apollolake/chip.h
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+++ b/src/soc/intel/apollolake/chip.h
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+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2015 Intel Corp.
+ * (Written by Alexandru Gagniuc <alexandrux.gagniuc@intel.com> for Intel Corp.)
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ */
+
+#ifndef _SOC_APOLLOLAKE_CHIP_H_
+#define _SOC_APOLLOLAKE_CHIP_H_
+
+#define CLKREQ_DISABLED 0xf
+
+struct soc_intel_apollolake_config {
+ /*
+ * Mapping from PCIe root port to CLKREQ input on the SOC. The SOC has
+ * four CLKREQ inputs, but six root ports. Root ports without an
+ * associated CLKREQ signal must be marked with "CLKREQ_DISABLED"
+ */
+ uint8_t pcie_rp0_clkreq_pin;
+ uint8_t pcie_rp1_clkreq_pin;
+ uint8_t pcie_rp2_clkreq_pin;
+ uint8_t pcie_rp3_clkreq_pin;
+ uint8_t pcie_rp4_clkreq_pin;
+ uint8_t pcie_rp5_clkreq_pin;
+};
+
+#endif /* _SOC_APOLLOLAKE_CHIP_H_ */