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From 5f4a7f6cabf2f7fdd75f8dba64394ed3f5c96d09 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Noralf=20Tr=C3=B8nnes?= <noralf@tronnes.org>
Date: Wed, 3 Jun 2015 12:26:13 +0200
Subject: [PATCH 107/725] ARM: bcm2835: Set Serial number and Revision
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
The VideoCore bootloader passes in Serial number and
Revision number through Device Tree. Make these available to
userspace through /proc/cpuinfo.
Mainline status:
There is a commit in linux-next that standardize passing the serial
number through Device Tree (string: /serial-number):
ARM: 8355/1: arch: Show the serial number from devicetree in cpuinfo
There was an attempt to do the same with the revision number, but it
didn't get in:
[PATCH v2 1/2] arm: devtree: Set system_rev from DT revision
Signed-off-by: Noralf Trønnes <noralf@tronnes.org>
---
arch/arm/mach-bcm/board_bcm2835.c | 14 ++++++++++++++
1 file changed, 14 insertions(+)
--- a/arch/arm/mach-bcm/board_bcm2835.c
+++ b/arch/arm/mach-bcm/board_bcm2835.c
@@ -15,12 +15,25 @@
#include <linux/init.h>
#include <linux/irqchip.h>
#include <linux/of_address.h>
+#include <asm/system_info.h>
#include <asm/mach/arch.h>
#include <asm/mach/map.h>
#include "platsmp.h"
+static void __init bcm2835_init(void)
+{
+ struct device_node *np = of_find_node_by_path("/system");
+ u32 val;
+ u64 val64;
+
+ if (!of_property_read_u32(np, "linux,revision", &val))
+ system_rev = val;
+ if (!of_property_read_u64(np, "linux,serial", &val64))
+ system_serial_low = val64;
+}
+
static const char * const bcm2835_compat[] = {
#ifdef CONFIG_ARCH_MULTI_V6
"brcm,bcm2835",
@@ -33,6 +46,7 @@ static const char * const bcm2835_compat
};
DT_MACHINE_START(BCM2835, "BCM2835")
+ .init_machine = bcm2835_init,
.dt_compat = bcm2835_compat,
.smp = smp_ops(bcm2836_smp_ops),
MACHINE_END
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