xref: /openbmc/u-boot/drivers/core/Kconfig (revision d9e268ed)
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_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_SYS_MALLOC_F_LEN for more details on how to enable it.
23
24config DM_WARN
25	bool "Enable warnings in driver model"
26	depends on DM
27	default y
28	help
29	  The dm_warn() function can use up quite a bit of space for its
30	  strings. By default this is disabled for SPL builds to save space.
31	  This will cause dm_warn() to be compiled out - it will do nothing
32	  when called.
33
34config DM_DEVICE_REMOVE
35	bool "Support device removal"
36	depends on DM
37	default y
38	help
39	  We can save some code space by dropping support for removing a
40	  device. This is not normally required in SPL, so by default this
41	  option is disabled for SPL.
42
43	  Note that this may have undesirable results in the USB subsystem as
44	  it causes unplugged devices to linger around in the dm-tree, and it
45	  causes USB host controllers to not be stopped when booting the OS.
46
47config DM_STDIO
48	bool "Support stdio registration"
49	depends on DM
50	default y
51	help
52	  Normally serial drivers register with stdio so that they can be used
53	  as normal output devices. In SPL we don't normally use stdio, so
54	  we can omit this feature.
55
56config DM_SEQ_ALIAS
57	bool "Support numbered aliases in device tree"
58	depends on DM
59	default y
60	help
61	  Most boards will have a '/aliases' node containing the path to
62	  numbered devices (e.g. serial0 = &serial0). This feature can be
63	  disabled if it is not required.
64
65config SPL_DM_SEQ_ALIAS
66	bool "Support numbered aliases in device tree in SPL"
67	depends on DM
68	default n
69	help
70	  Most boards will have a '/aliases' node containing the path to
71	  numbered devices (e.g. serial0 = &serial0). This feature can be
72	  disabled if it is not required, to save code space in SPL.
73
74config REGMAP
75	bool "Support register maps"
76	depends on DM
77	help
78	  Hardware peripherals tend to have one or more sets of registers
79	  which can be accessed to control the hardware. A register map
80	  models this with a simple read/write interface. It can in principle
81	  support any bus type (I2C, SPI) but so far this only supports
82	  direct memory access.
83
84config SPL_REGMAP
85	bool "Support register maps in SPL"
86	depends on DM
87	help
88	  Hardware peripherals tend to have one or more sets of registers
89	  which can be accessed to control the hardware. A register map
90	  models this with a simple read/write interface. It can in principle
91	  support any bus type (I2C, SPI) but so far this only supports
92	  direct memory access.
93
94config SYSCON
95	bool "Support system controllers"
96	depends on REGMAP
97	help
98	  Many SoCs have a number of system controllers which are dealt with
99	  as a group by a single driver. Some common functionality is provided
100	  by this uclass, including accessing registers via regmap and
101	  assigning a unique number to each.
102
103config SPL_SYSCON
104	bool "Support system controllers in SPL"
105	depends on REGMAP
106	help
107	  Many SoCs have a number of system controllers which are dealt with
108	  as a group by a single driver. Some common functionality is provided
109	  by this uclass, including accessing registers via regmap and
110	  assigning a unique number to each.
111
112config DEVRES
113	bool "Managed device resources"
114	depends on DM
115	help
116	  This option enables the Managed device resources core support.
117	  Device resources managed by the devres framework are automatically
118	  released whether initialization fails half-way or the device gets
119	  detached.
120
121	  If this option is disabled, devres functions fall back to
122	  non-managed variants.  For example, devres_alloc() to kzalloc(),
123	  devm_kmalloc() to kmalloc(), etc.
124
125config DEBUG_DEVRES
126	bool "Managed device resources debugging functions"
127	depends on DEVRES
128	help
129	  If this option is enabled, devres debug messages are printed.
130	  Also, a function is available to dump a list of device resources.
131	  Select this if you are having a problem with devres or want to
132	  debug resource management for a managed device.
133
134	  If you are unsure about this, Say N here.
135
136config SIMPLE_BUS
137	bool "Support simple-bus driver"
138	depends on DM && OF_CONTROL
139	default y
140	help
141	  Supports the 'simple-bus' driver, which is used on some systems.
142
143config SPL_SIMPLE_BUS
144	bool "Support simple-bus driver in SPL"
145	depends on SPL_DM && SPL_OF_CONTROL
146	default y
147	help
148	  Supports the 'simple-bus' driver, which is used on some systems
149	  in SPL.
150
151config OF_TRANSLATE
152	bool "Translate addresses using fdt_translate_address"
153	depends on DM && OF_CONTROL
154	default y
155	help
156	  If this option is enabled, the reg property will be translated
157	  using the fdt_translate_address() function. This is necessary
158	  on some platforms (e.g. MVEBU) using complex "ranges"
159	  properties in many nodes. As this translation is not handled
160	  correctly in the default simple_bus_translate() function.
161
162	  If this option is not enabled, simple_bus_translate() will be
163	  used for the address translation. This function is faster and
164	  smaller in size than fdt_translate_address().
165
166config SPL_OF_TRANSLATE
167	bool "Translate addresses using fdt_translate_address in SPL"
168	depends on SPL_DM && SPL_OF_CONTROL
169	default n
170	help
171	  If this option is enabled, the reg property will be translated
172	  using the fdt_translate_address() function. This is necessary
173	  on some platforms (e.g. MVEBU) using complex "ranges"
174	  properties in many nodes. As this translation is not handled
175	  correctly in the default simple_bus_translate() function.
176
177	  If this option is not enabled, simple_bus_translate() will be
178	  used for the address translation. This function is faster and
179	  smaller in size than fdt_translate_address().
180
181config OF_ISA_BUS
182	bool
183	depends on OF_TRANSLATE
184	help
185	  Is this option is enabled then support for the ISA bus will
186	  be included for addresses read from DT. This is something that
187	  should be known to be required or not based upon the board
188	  being targetted, and whether or not it makes use of an ISA bus.
189
190	  The bus is matched based upon its node name equalling "isa". The
191	  busses #address-cells should equal 2, with the first cell being
192	  used to hold flags & flag 0x1 indicating that the address range
193	  should be accessed using I/O port in/out accessors. The second
194	  cell holds the offset into ISA bus address space. The #size-cells
195	  property should equal 1, and of course holds the size of the
196	  address range used by a device.
197
198	  If this option is not enabled then support for the ISA bus is
199	  not included and any such busses used in DT will be treated as
200	  typical simple-bus compatible busses. This will lead to
201	  mistranslation of device addresses, so ensure that this is
202	  enabled if your board does include an ISA bus.
203
204endmenu
205