[SRU][Bionic/raspi2][PATCH] arch/arm64: Add Revision, Serial, Model to cpuinfo

[Juerg Haefliger]

From: Phil Elwell <phil at raspberrypi.org>

BugLink: https://bugs.launchpad.net/bugs/1823151

Signed-off-by: Phil Elwell <phil at raspberrypi.org>
(cherry picked from commit 935eb6f9a31971ef5537ac5d1b62148f8bcbad2f rpi-4.19.y)
Signed-off-by: Juerg Haefliger <juergh at canonical.com>
---
 arch/arm64/kernel/cpuinfo.c | 25 +++++++++++++++++++++++++
 1 file changed, 25 insertions(+)

diff --git a/arch/arm64/kernel/cpuinfo.c b/arch/arm64/kernel/cpuinfo.c
index 1e2554543506..fe810a2e4738 100644
--- a/arch/arm64/kernel/cpuinfo.c
+++ b/arch/arm64/kernel/cpuinfo.c
@@ -27,6 +27,7 @@
 #include <linux/elf.h>
 #include <linux/init.h>
 #include <linux/kernel.h>
+#include <linux/of_platform.h>
 #include <linux/personality.h>
 #include <linux/preempt.h>
 #include <linux/printk.h>
@@ -120,6 +121,10 @@ static int c_show(struct seq_file *m, void *v)
 {
 	int i, j;
 	bool compat = personality(current->personality) == PER_LINUX32;
+	struct device_node *np;
+	const char *model;
+	const char *serial;
+	u32 revision;
 
 	for_each_online_cpu(i) {
 		struct cpuinfo_arm64 *cpuinfo = &per_cpu(cpu_data, i);
@@ -171,6 +176,26 @@ 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, "Hardware\t: BCM2835\n");
+
+	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;
 }
 
-- 
2.20.1