LXR uboot/dts/Kconfig

   1#
   2# Device Tree Control
   3#
   4
   5config SUPPORT_OF_CONTROL
   6        bool
   7
   8menu "Device Tree Control"
   9        depends on SUPPORT_OF_CONTROL
  10
  11config OF_CONTROL
  12        bool "Run-time configuration via Device Tree"
  13        help
  14          This feature provides for run-time configuration of U-Boot
  15          via a flattened device tree.
  16
  17config OF_BOARD_FIXUP
  18        bool "Board-specific manipulation of Device Tree"
  19        help
  20          In certain circumstances it is necessary to be able to modify
  21          U-Boot's device tree (e.g. to delete device from it). This option
  22          make the Device Tree writeable and provides a board-specific
  23          "board_fix_fdt" callback (called during pre-relocation time), which
  24          enables the board initialization to modifiy the Device Tree. The
  25          modified copy is subsequently used by U-Boot after relocation.
  26
  27config SPL_OF_CONTROL
  28        bool "Enable run-time configuration via Device Tree in SPL"
  29        depends on SPL && OF_CONTROL
  30        help
  31          Some boards use device tree in U-Boot but only have 4KB of SRAM
  32          which is not enough to support device tree. Enable this option to
  33          allow such boards to be supported by U-Boot SPL.
  34
  35choice
  36        prompt "Provider of DTB for DT control"
  37        depends on OF_CONTROL
  38
  39config OF_SEPARATE
  40        bool "Separate DTB for DT control"
  41        depends on !SANDBOX
  42        help
  43          If this option is enabled, the device tree will be built and
  44          placed as a separate u-boot.dtb file alongside the U-Boot image.
  45
  46config OF_EMBED
  47        bool "Embedded DTB for DT control"
  48        help
  49          If this option is enabled, the device tree will be picked up and
  50          built into the U-Boot image. This is suitable for local debugging
  51          and development only and is not recommended for production devices.
  52          Boards in the mainline U-Boot tree should not use it.
  53
  54config OF_HOSTFILE
  55        bool "Host filed DTB for DT control"
  56        depends on SANDBOX
  57        help
  58          If this option is enabled, DTB will be read from a file on startup.
  59          This is only useful for Sandbox.  Use the -d flag to U-Boot to
  60          specify the file to read.
  61
  62endchoice
  63
  64config DEFAULT_DEVICE_TREE
  65        string "Default Device Tree for DT control"
  66        depends on OF_CONTROL
  67        help
  68          This option specifies the default Device Tree used for DT control.
  69          It can be overridden from the command line:
  70          $ make DEVICE_TREE=<device-tree-name>
  71
  72config OF_LIST
  73        string "List of device tree files to include for DT control"
  74        depends on SPL_LOAD_FIT
  75        default DEFAULT_DEVICE_TREE
  76        help
  77          This option specifies a list of device tree files to use for DT
  78          control. These will be packaged into a FIT. At run-time, SPL will
  79          select the correct DT to use by examining the hardware (e.g.
  80          reading a board ID value). This is a list of device tree files
  81          (without the directory or .dtb suffix) separated by <space>.
  82
  83config OF_SPL_REMOVE_PROPS
  84        string "List of device tree properties to drop for SPL"
  85        depends on SPL_OF_CONTROL
  86        default "interrupt-parent" if SPL_PINCTRL && SPL_CLK
  87        default "clocks clock-names interrupt-parent" if SPL_PINCTRL
  88        default "pinctrl-0 pinctrl-names interrupt-parent" if SPL_CLK
  89        default "pinctrl-0 pinctrl-names clocks clock-names interrupt-parent"
  90        help
  91          Since SPL normally runs in a reduced memory space, the device tree
  92          is cut down to only what is needed to load and start U-Boot. Only
  93          nodes marked with the property "u-boot,dm-pre-reloc" will be
  94          included. In addition, some properties are not used by U-Boot and
  95          can be discarded. This option defines the list of properties to
  96          discard.
  97
  98config SPL_OF_PLATDATA
  99        bool "Generate platform data for use in SPL"
 100        depends on SPL_OF_CONTROL
 101        help
 102          For very constrained SPL environments the overhead of decoding
 103          device tree nodes and converting their contents into platform data
 104          is too large. This overhead includes libfdt code as well as the
 105          device tree contents itself. The latter is fairly compact, but the
 106          former can add 3KB or more to a Thumb 2 Image.
 107
 108          This option enables generation of platform data from the device
 109          tree as C code. This code creates devices using U_BOOT_DEVICE()
 110          declarations. The benefit is that it allows driver code to access
 111          the platform data directly in C structures, avoidin the libfdt
 112          overhead.
 113
 114          This option works by generating C structure declarations for each
 115          compatible string, then adding platform data and U_BOOT_DEVICE
 116          declarations for each node. See README.platdata for more
 117          information.
 118
 119endmenu
 120