drivers/core/Kconfig

   1 menu "Generic Driver Options"
   2
   3 config DM
   4         bool "Enable Driver Model"
   5         help
   6           This config option enables Driver Model. This brings in the core
   7           support, including scanning of platform data on start-up. If
   8           CONFIG_OF_CONTROL is enabled, the device tree will be scanned also
   9           when available.
  10
  11 config SPL_DM
  12         bool "Enable Driver Model for SPL"
  13         depends on DM && SPL
  14         help
  15           Enable driver model in SPL. You will need to provide a
  16           suitable malloc() implementation. If you are not using the
  17           full malloc() enabled by CONFIG_SYS_SPL_MALLOC_START,
  18           consider using CONFIG_SYS_MALLOC_SIMPLE. In that case you
  19           must provide CONFIG_SPL_SYS_MALLOC_F_LEN to set the size.
  20           In most cases driver model will only allocate a few uclasses
  21           and devices in SPL, so 1KB should be enable. See
  22           CONFIG_SPL_SYS_MALLOC_F_LEN for more details on how to enable it.
  23
  24 config TPL_DM
  25         bool "Enable Driver Model for TPL"
  26         depends on DM && TPL
  27         help
  28           Enable driver model in TPL. You will need to provide a
  29           suitable malloc() implementation. If you are not using the
  30           full malloc() enabled by CONFIG_SYS_SPL_MALLOC_START,
  31           consider using CONFIG_SYS_MALLOC_SIMPLE. In that case you
  32           must provide CONFIG_SPL_SYS_MALLOC_F_LEN to set the size.
  33           In most cases driver model will only allocate a few uclasses
  34           and devices in SPL, so 1KB should be enough. See
  35           CONFIG_SPL_SYS_MALLOC_F_LEN for more details on how to enable it.
  36           Disable this for very small implementations.
  37
  38 config DM_WARN
  39         bool "Enable warnings in driver model"
  40         depends on DM
  41         default y
  42         help
  43           The dm_warn() function can use up quite a bit of space for its
  44           strings. By default this is disabled for SPL builds to save space.
  45           This will cause dm_warn() to be compiled out - it will do nothing
  46           when called.
  47
  48 config DM_DEBUG
  49         bool "Enable debug messages in driver model core"
  50         depends on DM
  51         help
  52           Say Y here if you want to compile in debug messages in DM core.
  53
  54 config DM_DEVICE_REMOVE
  55         bool "Support device removal"
  56         depends on DM
  57         default y
  58         help
  59           We can save some code space by dropping support for removing a
  60           device. This is not normally required in SPL, so by default this
  61           option is disabled for SPL.
  62
  63           Note that this may have undesirable results in the USB subsystem as
  64           it causes unplugged devices to linger around in the dm-tree, and it
  65           causes USB host controllers to not be stopped when booting the OS.
  66
  67 config DM_STDIO
  68         bool "Support stdio registration"
  69         depends on DM
  70         default y
  71         help
  72           Normally serial drivers register with stdio so that they can be used
  73           as normal output devices. In SPL we don't normally use stdio, so
  74           we can omit this feature.
  75
  76 config DM_SEQ_ALIAS
  77         bool "Support numbered aliases in device tree"
  78         depends on DM
  79         default y
  80         help
  81           Most boards will have a '/aliases' node containing the path to
  82           numbered devices (e.g. serial0 = &serial0). This feature can be
  83           disabled if it is not required.
  84
  85 config SPL_DM_SEQ_ALIAS
  86         bool "Support numbered aliases in device tree in SPL"
  87         depends on DM
  88         default n
  89         help
  90           Most boards will have a '/aliases' node containing the path to
  91           numbered devices (e.g. serial0 = &serial0). This feature can be
  92           disabled if it is not required, to save code space in SPL.
  93
  94 config REGMAP
  95         bool "Support register maps"
  96         depends on DM
  97         help
  98           Hardware peripherals tend to have one or more sets of registers
  99           which can be accessed to control the hardware. A register map
 100           models this with a simple read/write interface. It can in principle
 101           support any bus type (I2C, SPI) but so far this only supports
 102           direct memory access.
 103
 104 config SPL_REGMAP
 105         bool "Support register maps in SPL"
 106         depends on SPL_DM
 107         help
 108           Hardware peripherals tend to have one or more sets of registers
 109           which can be accessed to control the hardware. A register map
 110           models this with a simple read/write interface. It can in principle
 111           support any bus type (I2C, SPI) but so far this only supports
 112           direct memory access.
 113
 114 config TPL_REGMAP
 115         bool "Support register maps in TPL"
 116         depends on TPL_DM
 117         help
 118           Hardware peripherals tend to have one or more sets of registers
 119           which can be accessed to control the hardware. A register map
 120           models this with a simple read/write interface. It can in principle
 121           support any bus type (I2C, SPI) but so far this only supports
 122           direct memory access.
 123
 124 config SYSCON
 125         bool "Support system controllers"
 126         depends on REGMAP
 127         help
 128           Many SoCs have a number of system controllers which are dealt with
 129           as a group by a single driver. Some common functionality is provided
 130           by this uclass, including accessing registers via regmap and
 131           assigning a unique number to each.
 132
 133 config SPL_SYSCON
 134         bool "Support system controllers in SPL"
 135         depends on SPL_REGMAP
 136         help
 137           Many SoCs have a number of system controllers which are dealt with
 138           as a group by a single driver. Some common functionality is provided
 139           by this uclass, including accessing registers via regmap and
 140           assigning a unique number to each.
 141
 142 config TPL_SYSCON
 143         bool "Support system controllers in TPL"
 144         depends on TPL_REGMAP
 145         help
 146           Many SoCs have a number of system controllers which are dealt with
 147           as a group by a single driver. Some common functionality is provided
 148           by this uclass, including accessing registers via regmap and
 149           assigning a unique number to each.
 150
 151 config DEVRES
 152         bool "Managed device resources"
 153         depends on DM
 154         help
 155           This option enables the Managed device resources core support.
 156           Device resources managed by the devres framework are automatically
 157           released whether initialization fails half-way or the device gets
 158           detached.
 159
 160           If this option is disabled, devres functions fall back to
 161           non-managed variants.  For example, devres_alloc() to kzalloc(),
 162           devm_kmalloc() to kmalloc(), etc.
 163
 164 config DEBUG_DEVRES
 165         bool "Managed device resources debugging functions"
 166         depends on DEVRES
 167         help
 168           If this option is enabled, devres debug messages are printed.
 169           Also, a function is available to dump a list of device resources.
 170           Select this if you are having a problem with devres or want to
 171           debug resource management for a managed device.
 172
 173           If you are unsure about this, Say N here.
 174
 175 config SIMPLE_BUS
 176         bool "Support simple-bus driver"
 177         depends on DM && OF_CONTROL
 178         default y
 179         help
 180           Supports the 'simple-bus' driver, which is used on some systems.
 181
 182 config SPL_SIMPLE_BUS
 183         bool "Support simple-bus driver in SPL"
 184         depends on SPL_DM && SPL_OF_CONTROL
 185         default y
 186         help
 187           Supports the 'simple-bus' driver, which is used on some systems
 188           in SPL.
 189
 190 config OF_TRANSLATE
 191         bool "Translate addresses using fdt_translate_address"
 192         depends on DM && OF_CONTROL
 193         default y
 194         help
 195           If this option is enabled, the reg property will be translated
 196           using the fdt_translate_address() function. This is necessary
 197           on some platforms (e.g. MVEBU) using complex "ranges"
 198           properties in many nodes. As this translation is not handled
 199           correctly in the default simple_bus_translate() function.
 200
 201           If this option is not enabled, simple_bus_translate() will be
 202           used for the address translation. This function is faster and
 203           smaller in size than fdt_translate_address().
 204
 205 config SPL_OF_TRANSLATE
 206         bool "Translate addresses using fdt_translate_address in SPL"
 207         depends on SPL_DM && SPL_OF_CONTROL
 208         default n
 209         help
 210           If this option is enabled, the reg property will be translated
 211           using the fdt_translate_address() function. This is necessary
 212           on some platforms (e.g. MVEBU) using complex "ranges"
 213           properties in many nodes. As this translation is not handled
 214           correctly in the default simple_bus_translate() function.
 215
 216           If this option is not enabled, simple_bus_translate() will be
 217           used for the address translation. This function is faster and
 218           smaller in size than fdt_translate_address().
 219
 220 config OF_ISA_BUS
 221         bool
 222         depends on OF_TRANSLATE
 223         help
 224           Is this option is enabled then support for the ISA bus will
 225           be included for addresses read from DT. This is something that
 226           should be known to be required or not based upon the board
 227           being targetted, and whether or not it makes use of an ISA bus.
 228
 229           The bus is matched based upon its node name equalling "isa". The
 230           busses #address-cells should equal 2, with the first cell being
 231           used to hold flags & flag 0x1 indicating that the address range
 232           should be accessed using I/O port in/out accessors. The second
 233           cell holds the offset into ISA bus address space. The #size-cells
 234           property should equal 1, and of course holds the size of the
 235           address range used by a device.
 236
 237           If this option is not enabled then support for the ISA bus is
 238           not included and any such busses used in DT will be treated as
 239           typical simple-bus compatible busses. This will lead to
 240           mistranslation of device addresses, so ensure that this is
 241           enabled if your board does include an ISA bus.
 242
 243 config DM_DEV_READ_INLINE
 244         bool
 245         default y if !OF_LIVE
 246
 247 endmenu