target/linux/brcm2708/patches-3.18/0049-BCM2708-Add-core-Device-Tree-support.patch

   1 From f6459ef9602c16b02516be4848a77d30ce75d168 Mon Sep 17 00:00:00 2001
   2 From: notro <notro@tronnes.org>
   3 Date: Wed, 9 Jul 2014 14:46:08 +0200
   4 Subject: [PATCH 049/114] BCM2708: Add core Device Tree support
   5
   6 Add the bare minimum needed to boot BCM2708 from a Device Tree.
   7
   8 Signed-off-by: Noralf Tronnes <notro@tronnes.org>
   9
  10 BCM2708: DT: change 'axi' nodename to 'soc'
  11
  12 Change DT node named 'axi' to 'soc' so it matches ARCH_BCM2835.
  13 The VC4 bootloader fills in certain properties in the 'axi' subtree,
  14 but since this is part of an upstreaming effort, the name is changed.
  15
  16 Signed-off-by: Noralf Tronnes notro@tronnes.org
  17 ---
  18  arch/arm/boot/dts/Makefile          |  1 +
  19  arch/arm/boot/dts/bcm2708-rpi-b.dts |  8 ++++++++
  20  arch/arm/boot/dts/bcm2708.dtsi      | 27 +++++++++++++++++++++++++++
  21  arch/arm/mach-bcm2708/Kconfig       |  8 ++++++++
  22  arch/arm/mach-bcm2708/bcm2708.c     | 24 ++++++++++++++++++++++++
  23  5 files changed, 68 insertions(+)
  24  create mode 100644 arch/arm/boot/dts/bcm2708-rpi-b.dts
  25  create mode 100644 arch/arm/boot/dts/bcm2708.dtsi
  26
  27 --- a/arch/arm/boot/dts/Makefile
  28 +++ b/arch/arm/boot/dts/Makefile
  29 @@ -53,6 +53,7 @@ dtb-$(CONFIG_ARCH_AT91)       += at91-sama5d4e
  30
  31  dtb-$(CONFIG_ARCH_ATLAS6) += atlas6-evb.dtb
  32  dtb-$(CONFIG_ARCH_AXXIA) += axm5516-amarillo.dtb
  33 +dtb-$(CONFIG_BCM2708_DT) += bcm2708-rpi-b.dtb
  34  dtb-$(CONFIG_ARCH_BCM2835) += bcm2835-rpi-b.dtb
  35  dtb-$(CONFIG_ARCH_BCM_5301X) += bcm4708-netgear-r6250.dtb
  36  dtb-$(CONFIG_ARCH_BCM_63XX) += bcm963138dvt.dtb
  37 --- /dev/null
  38 +++ b/arch/arm/boot/dts/bcm2708-rpi-b.dts
  39 @@ -0,0 +1,8 @@
  40 +/dts-v1/;
  41 +
  42 +/include/ "bcm2708.dtsi"
  43 +
  44 +/ {
  45 +       compatible = "brcm,bcm2708";
  46 +       model = "Raspberry Pi";
  47 +};
  48 --- /dev/null
  49 +++ b/arch/arm/boot/dts/bcm2708.dtsi
  50 @@ -0,0 +1,27 @@
  51 +/include/ "skeleton.dtsi"
  52 +
  53 +/ {
  54 +       compatible = "brcm,bcm2708";
  55 +       model = "BCM2708";
  56 +
  57 +       chosen {
  58 +               /*
  59 +                  bootargs must be 1024 characters long because the
  60 +                  VC bootloader can't expand it
  61 +               */
  62 +               bootargs = "console=ttyAMA0                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 ";
  63 +       };
  64 +
  65 +       soc {
  66 +               compatible = "simple-bus";
  67 +               #address-cells = <1>;
  68 +               #size-cells = <1>;
  69 +               ranges = <0x7e000000 0x20000000 0x02000000>;
  70 +       };
  71 +
  72 +       clocks {
  73 +               compatible = "simple-bus";
  74 +               #address-cells = <1>;
  75 +               #size-cells = <0>;
  76 +       };
  77 +};
  78 --- a/arch/arm/mach-bcm2708/Kconfig
  79 +++ b/arch/arm/mach-bcm2708/Kconfig
  80 @@ -9,6 +9,14 @@ config MACH_BCM2708
  81         help
  82           Include support for the Broadcom(R) BCM2708 platform.
  83
  84 +config BCM2708_DT
  85 +       bool "BCM2708 Device Tree support"
  86 +       depends on MACH_BCM2708
  87 +       default n
  88 +       select USE_OF
  89 +       help
  90 +         Enable Device Tree support for BCM2708
  91 +
  92  config BCM2708_GPIO
  93         bool "BCM2708 gpio support"
  94         depends on MACH_BCM2708
  95 --- a/arch/arm/mach-bcm2708/bcm2708.c
  96 +++ b/arch/arm/mach-bcm2708/bcm2708.c
  97 @@ -33,6 +33,7 @@
  98  #include <linux/cnt32_to_63.h>
  99  #include <linux/io.h>
 100  #include <linux/module.h>
 101 +#include <linux/of_platform.h>
 102  #include <linux/spi/spi.h>
 103  #include <linux/w1-gpio.h>
 104
 105 @@ -734,6 +735,22 @@ static void bcm2708_power_off(void)
 106         }
 107  }
 108
 109 +#ifdef CONFIG_OF
 110 +static void __init bcm2708_dt_init(void)
 111 +{
 112 +       int ret;
 113 +
 114 +       of_clk_init(NULL);
 115 +       ret = of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL);
 116 +       if (ret) {
 117 +               pr_err("of_platform_populate failed: %d\n", ret);
 118 +               BUG();
 119 +       }
 120 +}
 121 +#else
 122 +static void __init bcm2708_dt_init(void) { }
 123 +#endif /* CONFIG_OF */
 124 +
 125  void __init bcm2708_init(void)
 126  {
 127         int i;
 128 @@ -745,6 +762,7 @@ void __init bcm2708_init(void)
 129         pm_power_off = bcm2708_power_off;
 130
 131         bcm2708_init_clocks();
 132 +       bcm2708_dt_init();
 133
 134         bcm_register_device(&bcm2708_dmaman_device);
 135         bcm_register_device(&bcm2708_vcio_device);
 136 @@ -965,6 +983,11 @@ static void __init board_reserve(void)
 137  #endif
 138  }
 139
 140 +static const char * const bcm2708_compat[] = {
 141 +       "brcm,bcm2708",
 142 +       NULL
 143 +};
 144 +
 145  MACHINE_START(BCM2708, "BCM2708")
 146      /* Maintainer: Broadcom Europe Ltd. */
 147         .map_io = bcm2708_map_io,
 148 @@ -974,6 +997,7 @@ MACHINE_START(BCM2708, "BCM2708")
 149         .init_early = bcm2708_init_early,
 150         .reserve = board_reserve,
 151         .restart        = bcm2708_restart,
 152 +       .dt_compat = bcm2708_compat,
 153  MACHINE_END
 154
 155  module_param(boardrev, uint, 0644);