target/linux/brcm2708/patches-4.4/0013-ARM-bcm2835-Set-Serial-number-and-Revision.patch

   1 From bfcfed788d152e828747ea889a88f8b179217ddb Mon Sep 17 00:00:00 2001
   2 From: =?UTF-8?q?Noralf=20Tr=C3=B8nnes?= <noralf@tronnes.org>
   3 Date: Wed, 3 Jun 2015 12:26:13 +0200
   4 Subject: [PATCH 013/170] ARM: bcm2835: Set Serial number and Revision
   5 MIME-Version: 1.0
   6 Content-Type: text/plain; charset=UTF-8
   7 Content-Transfer-Encoding: 8bit
   8
   9 The VideoCore bootloader passes in Serial number and
  10 Revision number through Device Tree. Make these available to
  11 userspace through /proc/cpuinfo.
  12
  13 Mainline status:
  14
  15 There is a commit in linux-next that standardize passing the serial
  16 number through Device Tree (string: /serial-number):
  17 ARM: 8355/1: arch: Show the serial number from devicetree in cpuinfo
  18
  19 There was an attempt to do the same with the revision number, but it
  20 didn't get in:
  21 [PATCH v2 1/2] arm: devtree: Set system_rev from DT revision
  22
  23 Signed-off-by: Noralf Trønnes <noralf@tronnes.org>
  24 ---
  25  arch/arm/mach-bcm/board_bcm2835.c | 9 +++++++++
  26  1 file changed, 9 insertions(+)
  27
  28 --- a/arch/arm/mach-bcm/board_bcm2835.c
  29 +++ b/arch/arm/mach-bcm/board_bcm2835.c
  30 @@ -17,12 +17,16 @@
  31  #include <linux/of_address.h>
  32  #include <linux/of_platform.h>
  33  #include <linux/clk/bcm2835.h>
  34 +#include <asm/system_info.h>
  35
  36  #include <asm/mach/arch.h>
  37  #include <asm/mach/map.h>
  38
  39  static void __init bcm2835_init(void)
  40  {
  41 +       struct device_node *np = of_find_node_by_path("/system");
  42 +       u32 val;
  43 +       u64 val64;
  44         int ret;
  45
  46         bcm2835_init_clocks();
  47 @@ -33,6 +37,11 @@ static void __init bcm2835_init(void)
  48                 pr_err("of_platform_populate failed: %d\n", ret);
  49                 BUG();
  50         }
  51 +
  52 +       if (!of_property_read_u32(np, "linux,revision", &val))
  53 +               system_rev = val;
  54 +       if (!of_property_read_u64(np, "linux,serial", &val64))
  55 +               system_serial_low = val64;
  56  }
  57
  58  static const char * const bcm2835_compat[] = {