From c61c201ea61dbc1b51fa0af3bad2cb398a656397 Mon Sep 17 00:00:00 2001
From: Phil Elwell <phil@raspberrypi.org>
Date: Tue, 3 Sep 2019 18:17:25 +0100
Subject: [PATCH] arch/arm64: Add Revision, Serial, Model to cpuinfo

Signed-off-by: Phil Elwell <phil@raspberrypi.org>
---
 arch/arm64/kernel/cpuinfo.c | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)

diff --git a/arch/arm64/kernel/cpuinfo.c b/arch/arm64/kernel/cpuinfo.c
index ba834909a28b..dadfc060e410 100644
--- a/arch/arm64/kernel/cpuinfo.c
+++ b/arch/arm64/kernel/cpuinfo.c
@@ -17,6 +17,8 @@
 #include <linux/elf.h>
 #include <linux/init.h>
 #include <linux/kernel.h>
+#include <linux/of.h>
+#include <linux/of_platform.h>
 #include <linux/personality.h>
 #include <linux/preempt.h>
 #include <linux/printk.h>
@@ -216,6 +218,10 @@ static int c_show(struct seq_file *m, void *v)
 	bool compat = personality(current->personality) == PER_LINUX32;
 	struct cpuinfo_arm64 *cpuinfo = v;
 	u32 midr = cpuinfo->reg_midr;
+	struct device_node *np;
+	const char *model;
+	const char *serial;
+	u32 revision;
 
 	/*
 	 * glibc reads /proc/cpuinfo to determine the number of
@@ -271,6 +277,24 @@ static int c_show(struct seq_file *m, void *v)
 	seq_printf(m, "CPU part\t: 0x%03x\n", MIDR_PARTNUM(midr));
 	seq_printf(m, "CPU revision\t: %d\n\n", MIDR_REVISION(midr));
 
+	np = of_find_node_by_path("/system");
+	if (np) {
+		if (!of_property_read_u32(np, "linux,revision", &revision))
+			seq_printf(m, "Revision\t: %04x\n", revision);
+		of_node_put(np);
+	}
+
+	np = of_find_node_by_path("/");
+	if (np) {
+		if (!of_property_read_string(np, "serial-number",
+					     &serial))
+			seq_printf(m, "Serial\t\t: %s\n", serial);
+		if (!of_property_read_string(np, "model",
+					     &model))
+			seq_printf(m, "Model\t\t: %s\n", model);
+		of_node_put(np);
+	}
+
 	return 0;
 }