From 3936ea811f0a5b828457a4d642db90dc5e0bc150 Mon Sep 17 00:00:00 2001
From: Tao Huang <huangtao@rock-chips.com>
Date: Thu, 27 Oct 2016 19:41:45 +0800
Subject: [PATCH] arm64: cpuinfo: add system serial support

Change-Id: I4542f07226e47e67be1f2792cffaa71fd6401442
Signed-off-by: Tao Huang <huangtao@rock-chips.com>
---
 arch/arm64/kernel/cpuinfo.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/arch/arm64/kernel/cpuinfo.c b/arch/arm64/kernel/cpuinfo.c
index 8690917651a3..4fb9a290a5ef 100644
--- a/arch/arm64/kernel/cpuinfo.c
+++ b/arch/arm64/kernel/cpuinfo.c
@@ -35,6 +35,12 @@
 #include <linux/smp.h>
 #include <linux/delay.h>
 
+unsigned int system_serial_low;
+EXPORT_SYMBOL(system_serial_low);
+
+unsigned int system_serial_high;
+EXPORT_SYMBOL(system_serial_high);
+
 /*
  * In case the boot CPU is hotpluggable, we record its initial state and
  * current state separately. Certain system registers may contain different
@@ -177,6 +183,9 @@ static int c_show(struct seq_file *m, void *v)
 		seq_printf(m, "CPU revision\t: %d\n\n", MIDR_REVISION(midr));
 	}
 
+	seq_printf(m, "Serial\t\t: %08x%08x\n",
+		   system_serial_high, system_serial_low);
+
 	return 0;
 }