1 menu "Generic Driver Options"
4 bool "Enable Driver Model"
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 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.
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 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.
39 bool "Enable warnings in driver model"
43 Enable this to see warnings related to driver model.
45 Warnings may help with debugging, such as when expected devices do
46 not bind correctly. If the option is disabled, dm_warn() is compiled
47 out - it will do nothing when called.
50 bool "Enable warnings in driver model wuth SPL"
53 Enable this to see warnings related to driver model in SPL
55 The dm_warn() function can use up quite a bit of space for its
56 strings. By default this is disabled for SPL builds to save space.
58 Warnings may help with debugging, such as when expected devices do
59 not bind correctly. If the option is disabled, dm_warn() is compiled
60 out - it will do nothing when called.
63 bool "Enable debug messages in driver model core"
66 Say Y here if you want to compile in debug messages in DM core.
68 config DM_DEVICE_REMOVE
69 bool "Support device removal"
73 We can save some code space by dropping support for removing a
76 Note that this may have undesirable results in the USB subsystem as
77 it causes unplugged devices to linger around in the dm-tree, and it
78 causes USB host controllers to not be stopped when booting the OS.
81 bool "Support events with driver model"
86 This enables support for generating events related to driver model
87 operations, such as prbing or removing a device. Subsystems can
88 register a 'spy' function that is called when the event occurs.
90 config SPL_DM_DEVICE_REMOVE
91 bool "Support device removal in SPL"
94 We can save some code space by dropping support for removing a
95 device. This is not normally required in SPL, so by default this
96 option is disabled for SPL.
99 bool "Support stdio registration"
103 Normally serial drivers register with stdio so that they can be used
104 as normal output devices. In SPL we don't normally use stdio, so
105 we can omit this feature.
108 bool "Support numbered aliases in device tree"
112 Most boards will have a '/aliases' node containing the path to
113 numbered devices (e.g. serial0 = &serial0). This feature can be
114 disabled if it is not required.
116 config SPL_DM_SEQ_ALIAS
117 bool "Support numbered aliases in device tree in SPL"
120 Most boards will have a '/aliases' node containing the path to
121 numbered devices (e.g. serial0 = &serial0). This feature can be
122 disabled if it is not required, to save code space in SPL.
124 config SPL_DM_INLINE_OFNODE
125 bool "Inline some ofnode functions which are seldom used in SPL"
129 This applies to several ofnode functions (see ofnode.h) which are
130 seldom used. Inlining them can help reduce code size.
132 config TPL_DM_INLINE_OFNODE
133 bool "Inline some ofnode functions which are seldom used in TPL"
137 This applies to several ofnode functions (see ofnode.h) which are
138 seldom used. Inlining them can help reduce code size.
141 bool "Support per-device DMA constraints"
144 Enable this to extract per-device DMA constraints, only supported on
145 device-tree systems for now. This is needed in order translate
146 addresses on systems where different buses have different views of
147 the physical address space.
150 bool "Support register maps"
153 Hardware peripherals tend to have one or more sets of registers
154 which can be accessed to control the hardware. A register map
155 models this with a simple read/write interface. It can in principle
156 support any bus type (I2C, SPI) but so far this only supports
157 direct memory access.
160 bool "Support register maps in SPL"
163 Hardware peripherals tend to have one or more sets of registers
164 which can be accessed to control the hardware. A register map
165 models this with a simple read/write interface. It can in principle
166 support any bus type (I2C, SPI) but so far this only supports
167 direct memory access.
170 bool "Support register maps in TPL"
173 Hardware peripherals tend to have one or more sets of registers
174 which can be accessed to control the hardware. A register map
175 models this with a simple read/write interface. It can in principle
176 support any bus type (I2C, SPI) but so far this only supports
177 direct memory access.
180 bool "Support system controllers"
183 Many SoCs have a number of system controllers which are dealt with
184 as a group by a single driver. Some common functionality is provided
185 by this uclass, including accessing registers via regmap and
186 assigning a unique number to each.
189 bool "Support system controllers in SPL"
190 depends on SPL_REGMAP
192 Many SoCs have a number of system controllers which are dealt with
193 as a group by a single driver. Some common functionality is provided
194 by this uclass, including accessing registers via regmap and
195 assigning a unique number to each.
198 bool "Support system controllers in TPL"
199 depends on TPL_REGMAP
201 Many SoCs have a number of system controllers which are dealt with
202 as a group by a single driver. Some common functionality is provided
203 by this uclass, including accessing registers via regmap and
204 assigning a unique number to each.
207 bool "Managed device resources"
210 This option enables the Managed device resources core support.
211 Device resources managed by the devres framework are automatically
212 released whether initialization fails half-way or the device gets
215 If this option is disabled, devres functions fall back to
216 non-managed variants. For example, devres_alloc() to kzalloc(),
217 devm_kmalloc() to kmalloc(), etc.
220 bool "Managed device resources debugging functions"
223 If this option is enabled, devres debug messages are printed.
224 Also, a function is available to dump a list of device resources.
225 Select this if you are having a problem with devres or want to
226 debug resource management for a managed device.
228 If you are unsure about this, Say N here.
231 bool "Support simple-bus driver"
232 depends on DM && OF_CONTROL
235 Supports the 'simple-bus' driver, which is used on some systems.
237 config SPL_SIMPLE_BUS
238 bool "Support simple-bus driver in SPL"
239 depends on SPL_DM && SPL_OF_CONTROL
242 Supports the 'simple-bus' driver, which is used on some systems
245 config SIMPLE_BUS_CORRECT_RANGE
246 bool "Decode the 'simple-bus' <range> by honoring the #address-cells and #size-cells"
247 depends on SIMPLE_BUS
250 Decoding the 'simple-bus' <range> by honoring the #address-cells
251 and #size-cells of parent/child bus. If unset, #address-cells of
252 parent bus is assumed to be 1, #address-cells and #size-cells of
253 child bus is also assumed to be 1, to save some spaces of using
254 an advanced API to decode the <range>, which benefits SPL image
255 builds that have size limits.
257 If you are unsure about this, Say N here.
260 bool "Support simple-pm-bus driver"
261 depends on DM && OF_CONTROL && CLK && POWER_DOMAIN
263 Supports the 'simple-pm-bus' driver, which is used for busses that
264 have power domains and/or clocks which need to be enabled before use.
267 bool "Translate addresses using fdt_translate_address"
268 depends on DM && OF_CONTROL
271 If this option is enabled, the reg property will be translated
272 using the fdt_translate_address() function. This is necessary
273 on some platforms (e.g. MVEBU) using complex "ranges"
274 properties in many nodes. As this translation is not handled
275 correctly in the default simple_bus_translate() function.
277 If this option is not enabled, simple_bus_translate() will be
278 used for the address translation. This function is faster and
279 smaller in size than fdt_translate_address().
281 config SPL_OF_TRANSLATE
282 bool "Translate addresses using fdt_translate_address in SPL"
283 depends on SPL_DM && SPL_OF_CONTROL
285 If this option is enabled, the reg property will be translated
286 using the fdt_translate_address() function. This is necessary
287 on some platforms (e.g. MVEBU) using complex "ranges"
288 properties in many nodes. As this translation is not handled
289 correctly in the default simple_bus_translate() function.
291 If this option is not enabled, simple_bus_translate() will be
292 used for the address translation. This function is faster and
293 smaller in size than fdt_translate_address().
295 config TRANSLATION_OFFSET
296 bool "Platforms specific translation offset"
297 depends on DM && OF_CONTROL
299 Some platforms need a special address translation. Those
300 platforms (e.g. mvebu in SPL) can configure a translation
301 offset by enabling this option and setting the translation_offset
302 variable in the GD in their platform- / board-specific code.
306 depends on OF_TRANSLATE
308 Is this option is enabled then support for the ISA bus will
309 be included for addresses read from DT. This is something that
310 should be known to be required or not based upon the board
311 being targeted, and whether or not it makes use of an ISA bus.
313 The bus is matched based upon its node name equalling "isa". The
314 busses #address-cells should equal 2, with the first cell being
315 used to hold flags & flag 0x1 indicating that the address range
316 should be accessed using I/O port in/out accessors. The second
317 cell holds the offset into ISA bus address space. The #size-cells
318 property should equal 1, and of course holds the size of the
319 address range used by a device.
321 If this option is not enabled then support for the ISA bus is
322 not included and any such busses used in DT will be treated as
323 typical simple-bus compatible busses. This will lead to
324 mistranslation of device addresses, so ensure that this is
325 enabled if your board does include an ISA bus.
327 config DM_DEV_READ_INLINE
329 default y if !OF_LIVE
332 bool "Support ACPI table generation in driver model"
333 default y if SANDBOX || (GENERATE_ACPI_TABLE && !QEMU)
336 This option enables generation of ACPI tables using driver-model
337 devices. It adds a new operation struct to each driver, to support
338 things like generating device-specific tables and returning the ACPI
342 bool "Include bounce buffer API"
344 Some peripherals support DMA from a subset of physically
345 addressable memory only. To support such peripherals, the
346 bounce buffer API uses a temporary buffer: it copies data
347 to/from DMA regions while managing cache operations.
349 A second possible use of bounce buffers is their ability to
350 provide aligned buffers for DMA operations.