xref: /openbmc/u-boot/drivers/core/Kconfig (revision 8eef803a)
1menu "Generic Driver Options"
2
3config 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
11config 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
24config 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
38config 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
48config 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
54config 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.
61
62	  Note that this may have undesirable results in the USB subsystem as
63	  it causes unplugged devices to linger around in the dm-tree, and it
64	  causes USB host controllers to not be stopped when booting the OS.
65
66config SPL_DM_DEVICE_REMOVE
67	bool "Support device removal in SPL"
68	depends on SPL_DM
69	default n
70	help
71	  We can save some code space by dropping support for removing a
72	  device. This is not normally required in SPL, so by default this
73	  option is disabled for SPL.
74
75config DM_STDIO
76	bool "Support stdio registration"
77	depends on DM
78	default y
79	help
80	  Normally serial drivers register with stdio so that they can be used
81	  as normal output devices. In SPL we don't normally use stdio, so
82	  we can omit this feature.
83
84config DM_SEQ_ALIAS
85	bool "Support numbered aliases in device tree"
86	depends on DM
87	default y
88	help
89	  Most boards will have a '/aliases' node containing the path to
90	  numbered devices (e.g. serial0 = &serial0). This feature can be
91	  disabled if it is not required.
92
93config SPL_DM_SEQ_ALIAS
94	bool "Support numbered aliases in device tree in SPL"
95	depends on DM
96	default n
97	help
98	  Most boards will have a '/aliases' node containing the path to
99	  numbered devices (e.g. serial0 = &serial0). This feature can be
100	  disabled if it is not required, to save code space in SPL.
101
102config REGMAP
103	bool "Support register maps"
104	depends on DM
105	help
106	  Hardware peripherals tend to have one or more sets of registers
107	  which can be accessed to control the hardware. A register map
108	  models this with a simple read/write interface. It can in principle
109	  support any bus type (I2C, SPI) but so far this only supports
110	  direct memory access.
111
112config SPL_REGMAP
113	bool "Support register maps in SPL"
114	depends on SPL_DM
115	help
116	  Hardware peripherals tend to have one or more sets of registers
117	  which can be accessed to control the hardware. A register map
118	  models this with a simple read/write interface. It can in principle
119	  support any bus type (I2C, SPI) but so far this only supports
120	  direct memory access.
121
122config TPL_REGMAP
123	bool "Support register maps in TPL"
124	depends on TPL_DM
125	help
126	  Hardware peripherals tend to have one or more sets of registers
127	  which can be accessed to control the hardware. A register map
128	  models this with a simple read/write interface. It can in principle
129	  support any bus type (I2C, SPI) but so far this only supports
130	  direct memory access.
131
132config SYSCON
133	bool "Support system controllers"
134	depends on REGMAP
135	help
136	  Many SoCs have a number of system controllers which are dealt with
137	  as a group by a single driver. Some common functionality is provided
138	  by this uclass, including accessing registers via regmap and
139	  assigning a unique number to each.
140
141config SPL_SYSCON
142	bool "Support system controllers in SPL"
143	depends on SPL_REGMAP
144	help
145	  Many SoCs have a number of system controllers which are dealt with
146	  as a group by a single driver. Some common functionality is provided
147	  by this uclass, including accessing registers via regmap and
148	  assigning a unique number to each.
149
150config TPL_SYSCON
151	bool "Support system controllers in TPL"
152	depends on TPL_REGMAP
153	help
154	  Many SoCs have a number of system controllers which are dealt with
155	  as a group by a single driver. Some common functionality is provided
156	  by this uclass, including accessing registers via regmap and
157	  assigning a unique number to each.
158
159config DEVRES
160	bool "Managed device resources"
161	depends on DM
162	help
163	  This option enables the Managed device resources core support.
164	  Device resources managed by the devres framework are automatically
165	  released whether initialization fails half-way or the device gets
166	  detached.
167
168	  If this option is disabled, devres functions fall back to
169	  non-managed variants.  For example, devres_alloc() to kzalloc(),
170	  devm_kmalloc() to kmalloc(), etc.
171
172config DEBUG_DEVRES
173	bool "Managed device resources debugging functions"
174	depends on DEVRES
175	help
176	  If this option is enabled, devres debug messages are printed.
177	  Also, a function is available to dump a list of device resources.
178	  Select this if you are having a problem with devres or want to
179	  debug resource management for a managed device.
180
181	  If you are unsure about this, Say N here.
182
183config SIMPLE_BUS
184	bool "Support simple-bus driver"
185	depends on DM && OF_CONTROL
186	default y
187	help
188	  Supports the 'simple-bus' driver, which is used on some systems.
189
190config SPL_SIMPLE_BUS
191	bool "Support simple-bus driver in SPL"
192	depends on SPL_DM && SPL_OF_CONTROL
193	default y
194	help
195	  Supports the 'simple-bus' driver, which is used on some systems
196	  in SPL.
197
198config OF_TRANSLATE
199	bool "Translate addresses using fdt_translate_address"
200	depends on DM && OF_CONTROL
201	default y
202	help
203	  If this option is enabled, the reg property will be translated
204	  using the fdt_translate_address() function. This is necessary
205	  on some platforms (e.g. MVEBU) using complex "ranges"
206	  properties in many nodes. As this translation is not handled
207	  correctly in the default simple_bus_translate() function.
208
209	  If this option is not enabled, simple_bus_translate() will be
210	  used for the address translation. This function is faster and
211	  smaller in size than fdt_translate_address().
212
213config SPL_OF_TRANSLATE
214	bool "Translate addresses using fdt_translate_address in SPL"
215	depends on SPL_DM && SPL_OF_CONTROL
216	default n
217	help
218	  If this option is enabled, the reg property will be translated
219	  using the fdt_translate_address() function. This is necessary
220	  on some platforms (e.g. MVEBU) using complex "ranges"
221	  properties in many nodes. As this translation is not handled
222	  correctly in the default simple_bus_translate() function.
223
224	  If this option is not enabled, simple_bus_translate() will be
225	  used for the address translation. This function is faster and
226	  smaller in size than fdt_translate_address().
227
228config OF_ISA_BUS
229	bool
230	depends on OF_TRANSLATE
231	help
232	  Is this option is enabled then support for the ISA bus will
233	  be included for addresses read from DT. This is something that
234	  should be known to be required or not based upon the board
235	  being targeted, and whether or not it makes use of an ISA bus.
236
237	  The bus is matched based upon its node name equalling "isa". The
238	  busses #address-cells should equal 2, with the first cell being
239	  used to hold flags & flag 0x1 indicating that the address range
240	  should be accessed using I/O port in/out accessors. The second
241	  cell holds the offset into ISA bus address space. The #size-cells
242	  property should equal 1, and of course holds the size of the
243	  address range used by a device.
244
245	  If this option is not enabled then support for the ISA bus is
246	  not included and any such busses used in DT will be treated as
247	  typical simple-bus compatible busses. This will lead to
248	  mistranslation of device addresses, so ensure that this is
249	  enabled if your board does include an ISA bus.
250
251config DM_DEV_READ_INLINE
252	bool
253	default y if !OF_LIVE
254
255endmenu
256