1 menu "Generic Driver Options"
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
12 bool "Enable Driver Model for SPL"
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 CFG_SPL_SYS_MALLOC_START,
18 consider using CONFIG_SPL_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 enough. See
22 CONFIG_SPL_SYS_MALLOC_F_LEN for more details on how to enable it.
25 bool "Enable Driver Model for TPL"
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 CFG_TPL_SYS_MALLOC_START,
31 consider using CONFIG_TPL_SYS_MALLOC_SIMPLE. In that case you
32 must provide CONFIG_TPL_SYS_MALLOC_F_LEN to set the size.
33 In most cases driver model will only allocate a few uclasses
34 and devices in TPL, so 1KB should be enough. See
35 CONFIG_TPL_SYS_MALLOC_F_LEN for more details on how to enable it.
36 Disable this for very small implementations.
39 bool "Enable Driver Model for VPL"
43 Enable driver model in VPL. You will need to provide a
44 suitable malloc() implementation. If you are not using the
45 full malloc() enabled by CFG_TPL_SYS_MALLOC_START,
46 consider using CONFIG_TPL_SYS_MALLOC_SIMPLE.
49 bool "Enable warnings in driver model"
52 Enable this to see warnings related to driver model.
54 Warnings may help with debugging, such as when expected devices do
55 not bind correctly. If the option is disabled, dm_warn() is compiled
56 out - it will do nothing when called.
59 bool "Enable warnings in driver model in SPL"
62 Enable this to see warnings related to driver model in SPL
64 The dm_warn() function can use up quite a bit of space for its
65 strings. By default this is disabled for SPL builds to save space.
67 Warnings may help with debugging, such as when expected devices do
68 not bind correctly. If the option is disabled, dm_warn() is compiled
69 out - it will do nothing when called.
72 bool "Enable debug messages in driver model core"
75 Say Y here if you want to compile in debug messages in DM core.
78 bool "Collect and show driver model stats"
82 Enable this to collect and display memory statistics about driver
83 model. This can help to figure out where all the memory is going and
84 to find optimisations.
86 To display the memory stats, use the 'dm mem' command.
89 bool "Collect and show driver model stats in SPL"
92 Enable this to collect and display memory statistics about driver
93 model. This can help to figure out where all the memory is going and
94 to find optimisations.
96 The stats are displayed just before SPL boots to the next phase.
98 config DM_DEVICE_REMOVE
99 bool "Support device removal"
103 We can save some code space by dropping support for removing a
106 Note that this may have undesirable results in the USB subsystem as
107 it causes unplugged devices to linger around in the dm-tree, and it
108 causes USB host controllers to not be stopped when booting the OS.
115 This enables support for generating events related to driver model
116 operations, such as probing or removing a device. Subsystems can
117 register a 'spy' function that is called when the event occurs. Such
118 subsystems must select this option.
120 config SPL_DM_DEVICE_REMOVE
121 bool "Support device removal in SPL"
124 We can save some code space by dropping support for removing a
125 device. This is not normally required in SPL, so by default this
126 option is disabled for SPL.
129 bool "Support stdio registration"
133 Normally serial drivers register with stdio so that they can be used
134 as normal output devices. In SPL we don't normally use stdio, so
135 we can omit this feature.
138 bool "Support numbered aliases in device tree"
142 Most boards will have a '/aliases' node containing the path to
143 numbered devices (e.g. serial0 = &serial0). This feature can be
144 disabled if it is not required.
146 config SPL_DM_SEQ_ALIAS
147 bool "Support numbered aliases in device tree in SPL"
151 Most boards will have a '/aliases' node containing the path to
152 numbered devices (e.g. serial0 = &serial0). This feature can be
153 disabled if it is not required, to save code space in SPL.
155 config TPL_DM_SEQ_ALIAS
156 bool "Support numbered aliases in device tree in TPL"
159 Most boards will have a '/aliases' node containing the path to
160 numbered devices (e.g. serial0 = &serial0). This feature can be
161 disabled if it is not required, to save code space in SPL.
163 config VPL_DM_SEQ_ALIAS
164 bool "Support numbered aliases in device tree in VPL"
168 Most boards will have a '/aliases' node containing the path to
169 numbered devices (e.g. serial0 = &serial0). This feature can be
170 disabled if it is not required, to save code space in VPL.
172 config SPL_DM_INLINE_OFNODE
173 bool "Inline some ofnode functions which are seldom used in SPL"
177 This applies to several ofnode functions (see ofnode.h) which are
178 seldom used. Inlining them can help reduce code size.
180 config TPL_DM_INLINE_OFNODE
181 bool "Inline some ofnode functions which are seldom used in TPL"
185 This applies to several ofnode functions (see ofnode.h) which are
186 seldom used. Inlining them can help reduce code size.
189 bool "Support per-device DMA constraints"
192 Enable this to extract per-device DMA constraints, only supported on
193 device-tree systems for now. This is needed in order translate
194 addresses on systems where different buses have different views of
195 the physical address space.
198 bool "Support register maps"
201 Hardware peripherals tend to have one or more sets of registers
202 which can be accessed to control the hardware. A register map
203 models this with a simple read/write interface. It can in principle
204 support any bus type (I2C, SPI) but so far this only supports
205 direct memory access.
208 bool "Support register maps in SPL"
211 Hardware peripherals tend to have one or more sets of registers
212 which can be accessed to control the hardware. A register map
213 models this with a simple read/write interface. It can in principle
214 support any bus type (I2C, SPI) but so far this only supports
215 direct memory access.
218 bool "Support register maps in TPL"
221 Hardware peripherals tend to have one or more sets of registers
222 which can be accessed to control the hardware. A register map
223 models this with a simple read/write interface. It can in principle
224 support any bus type (I2C, SPI) but so far this only supports
225 direct memory access.
228 bool "Support register maps in VPL"
231 Hardware peripherals tend to have one or more sets of registers
232 which can be accessed to control the hardware. A register map
233 models this with a simple read/write interface. It can in principle
234 support any bus type (I2C, SPI) but so far this only supports
235 direct memory access.
238 bool "Support system controllers"
241 Many SoCs have a number of system controllers which are dealt with
242 as a group by a single driver. Some common functionality is provided
243 by this uclass, including accessing registers via regmap and
244 assigning a unique number to each.
247 bool "Support system controllers in SPL"
248 depends on SPL_REGMAP
250 Many SoCs have a number of system controllers which are dealt with
251 as a group by a single driver. Some common functionality is provided
252 by this uclass, including accessing registers via regmap and
253 assigning a unique number to each.
256 bool "Support system controllers in TPL"
257 depends on TPL_REGMAP
259 Many SoCs have a number of system controllers which are dealt with
260 as a group by a single driver. Some common functionality is provided
261 by this uclass, including accessing registers via regmap and
262 assigning a unique number to each.
265 bool "Support system controllers in VPL"
266 depends on VPL_REGMAP
268 Many SoCs have a number of system controllers which are dealt with
269 as a group by a single driver. Some common functionality is provided
270 by this uclass, including accessing registers via regmap and
271 assigning a unique number to each.
274 bool "Managed device resources"
277 This option enables the Managed device resources core support.
278 Device resources managed by the devres framework are automatically
279 released whether initialization fails half-way or the device gets
282 If this option is disabled, devres functions fall back to
283 non-managed variants. For example, devres_alloc() to kzalloc(),
284 devm_kmalloc() to kmalloc(), etc.
287 bool "Managed device resources debugging functions"
290 If this option is enabled, devres debug messages are printed.
291 Also, a function is available to dump a list of device resources.
292 Select this if you are having a problem with devres or want to
293 debug resource management for a managed device.
295 If you are unsure about this, Say N here.
298 bool "Support simple-bus driver"
299 depends on DM && OF_CONTROL
302 Supports the 'simple-bus' driver, which is used on some systems.
304 config SPL_SIMPLE_BUS
305 bool "Support simple-bus driver in SPL"
306 depends on SPL_DM && SPL_OF_CONTROL
309 Supports the 'simple-bus' driver, which is used on some systems
312 config TPL_SIMPLE_BUS
313 bool "Support simple-bus driver in TPL"
314 depends on TPL_DM && TPL_OF_CONTROL
316 Supports the 'simple-bus' driver, which is used on some systems
319 config SIMPLE_BUS_CORRECT_RANGE
320 bool "Decode the 'simple-bus' <range> by honoring the #address-cells and #size-cells"
321 depends on SIMPLE_BUS
324 Decoding the 'simple-bus' <range> by honoring the #address-cells
325 and #size-cells of parent/child bus. If unset, #address-cells of
326 parent bus is assumed to be 1, #address-cells and #size-cells of
327 child bus is also assumed to be 1, to save some spaces of using
328 an advanced API to decode the <range>, which benefits SPL image
329 builds that have size limits.
331 If you are unsure about this, Say N here.
334 bool "Support simple-pm-bus driver"
335 depends on DM && OF_CONTROL && CLK && POWER_DOMAIN
337 Supports the 'simple-pm-bus' driver, which is used for busses that
338 have power domains and/or clocks which need to be enabled before use.
341 bool "Translate addresses using fdt_translate_address"
342 depends on DM && OF_CONTROL
345 If this option is enabled, the reg property will be translated
346 using the fdt_translate_address() function. This is necessary
347 on some platforms (e.g. MVEBU) using complex "ranges"
348 properties in many nodes. As this translation is not handled
349 correctly in the default simple_bus_translate() function.
351 If this option is not enabled, simple_bus_translate() will be
352 used for the address translation. This function is faster and
353 smaller in size than fdt_translate_address().
355 config SPL_OF_TRANSLATE
356 bool "Translate addresses using fdt_translate_address in SPL"
357 depends on SPL_DM && SPL_OF_CONTROL
359 If this option is enabled, the reg property will be translated
360 using the fdt_translate_address() function. This is necessary
361 on some platforms (e.g. MVEBU) using complex "ranges"
362 properties in many nodes. As this translation is not handled
363 correctly in the default simple_bus_translate() function.
365 If this option is not enabled, simple_bus_translate() will be
366 used for the address translation. This function is faster and
367 smaller in size than fdt_translate_address().
369 config TPL_OF_TRANSLATE
370 bool "Translate addresses using fdt_translate_address in TPL"
371 depends on TPL_DM && TPL_OF_CONTROL
373 If this option is enabled, the reg property will be translated
374 using the fdt_translate_address() function. This is necessary
375 on some platforms (e.g. MVEBU) using complex "ranges"
376 properties in many nodes. As this translation is not handled
377 correctly in the default simple_bus_translate() function.
379 If this option is not enabled, simple_bus_translate() will be
380 used for the address translation. This function is faster and
381 smaller in size than fdt_translate_address()
383 config VPL_OF_TRANSLATE
384 bool "Translate addresses using fdt_translate_address in SPL"
385 depends on SPL_DM && VPL_OF_CONTROL
387 If this option is enabled, the reg property will be translated
388 using the fdt_translate_address() function. This is necessary
389 on some platforms (e.g. MVEBU) using complex "ranges"
390 properties in many nodes. As this translation is not handled
391 correctly in the default simple_bus_translate() function.
393 If this option is not enabled, simple_bus_translate() will be
394 used for the address translation. This function is faster and
395 smaller in size than fdt_translate_address().
397 config TRANSLATION_OFFSET
398 bool "Platforms specific translation offset"
399 depends on DM && OF_CONTROL
401 Some platforms need a special address translation. Those
402 platforms (e.g. mvebu in SPL) can configure a translation
403 offset by enabling this option and setting the translation_offset
404 variable in the GD in their platform- / board-specific code.
408 depends on OF_TRANSLATE
410 Is this option is enabled then support for the ISA bus will
411 be included for addresses read from DT. This is something that
412 should be known to be required or not based upon the board
413 being targeted, and whether or not it makes use of an ISA bus.
415 The bus is matched based upon its node name equalling "isa". The
416 busses #address-cells should equal 2, with the first cell being
417 used to hold flags & flag 0x1 indicating that the address range
418 should be accessed using I/O port in/out accessors. The second
419 cell holds the offset into ISA bus address space. The #size-cells
420 property should equal 1, and of course holds the size of the
421 address range used by a device.
423 If this option is not enabled then support for the ISA bus is
424 not included and any such busses used in DT will be treated as
425 typical simple-bus compatible busses. This will lead to
426 mistranslation of device addresses, so ensure that this is
427 enabled if your board does include an ISA bus.
429 config DM_DEV_READ_INLINE
431 default y if !OF_LIVE
433 config OFNODE_MULTI_TREE
434 bool "Allow the ofnode interface to access any tree"
435 default y if EVENT && !DM_DEV_READ_INLINE && !DM_INLINE_OFNODE
437 Normally U-Boot makes use of its control FDT, the one used to bind
438 devices and provide options. In some cases, U-Boot must also process
439 a separate FDT, e.g. one provided by the operating system, which
440 needs additions to the /chosen node.
442 This works fine with live tree (OF_LIVE), but with flat tree the
443 offset provided in ofnode is only useful with the control FDT. This
444 option adds a 'tree ID' to the offset, so that multiple trees can
445 be used. Call oftree_from_fdt() to register a new tree.
447 config OFNODE_MULTI_TREE_MAX
448 int "Maximum number of FDTs"
450 depends on OFNODE_MULTI_TREE
453 Sets the maximum number of device trees which can be used with the
454 ofnode interface when using flat trees (OF_LIVE). This is only
455 available in U-Boot proper and only after relocation.
458 bool "Support ACPI table generation in driver model"
460 default y if SANDBOX || (GENERATE_ACPI_TABLE && !QEMU)
463 This option enables generation of ACPI tables using driver-model
464 devices. It adds a new operation struct to each driver, to support
465 things like generating device-specific tables and returning the ACPI
469 bool "Include bounce buffer API"
471 Some peripherals support DMA from a subset of physically
472 addressable memory only. To support such peripherals, the
473 bounce buffer API uses a temporary buffer: it copies data
474 to/from DMA regions while managing cache operations.
476 A second possible use of bounce buffers is their ability to
477 provide aligned buffers for DMA operations.