2019-09-19 14:43:19 +00:00
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From 6eb5a426229447a1045507fb63afdb11ddc5eda4 Mon Sep 17 00:00:00 2001
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2019-07-09 18:32:28 +00:00
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From: =?UTF-8?q?Noralf=20Tr=C3=B8nnes?= <noralf@tronnes.org>
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Date: Wed, 3 Jun 2015 12:26:13 +0200
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2019-12-23 12:42:55 +00:00
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Subject: [PATCH] ARM: bcm2835: Set Serial number and Revision
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2019-07-09 18:32:28 +00:00
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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The VideoCore bootloader passes in Serial number and
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Revision number through Device Tree. Make these available to
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userspace through /proc/cpuinfo.
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Mainline status:
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There is a commit in linux-next that standardize passing the serial
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number through Device Tree (string: /serial-number):
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ARM: 8355/1: arch: Show the serial number from devicetree in cpuinfo
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There was an attempt to do the same with the revision number, but it
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didn't get in:
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[PATCH v2 1/2] arm: devtree: Set system_rev from DT revision
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Signed-off-by: Noralf Trønnes <noralf@tronnes.org>
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---
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arch/arm/mach-bcm/board_bcm2835.c | 14 ++++++++++++++
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1 file changed, 14 insertions(+)
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--- a/arch/arm/mach-bcm/board_bcm2835.c
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+++ b/arch/arm/mach-bcm/board_bcm2835.c
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@@ -15,12 +15,25 @@
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#include <linux/init.h>
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#include <linux/irqchip.h>
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#include <linux/of_address.h>
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+#include <asm/system_info.h>
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#include <asm/mach/arch.h>
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#include <asm/mach/map.h>
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#include "platsmp.h"
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+static void __init bcm2835_init(void)
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+{
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+ struct device_node *np = of_find_node_by_path("/system");
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+ u32 val;
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+ u64 val64;
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+
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+ if (!of_property_read_u32(np, "linux,revision", &val))
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+ system_rev = val;
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+ if (!of_property_read_u64(np, "linux,serial", &val64))
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+ system_serial_low = val64;
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+}
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+
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static const char * const bcm2835_compat[] = {
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#ifdef CONFIG_ARCH_MULTI_V6
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"brcm,bcm2835",
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@@ -33,6 +46,7 @@ static const char * const bcm2835_compat
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};
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DT_MACHINE_START(BCM2835, "BCM2835")
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+ .init_machine = bcm2835_init,
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.dt_compat = bcm2835_compat,
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.smp = smp_ops(bcm2836_smp_ops),
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MACHINE_END
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