1 menu "Generic Driver Options"
7 bool "Enable Driver Model"
9 This config option enables Driver Model. This brings in the core
10 support, including scanning of platform data on start-up. If
11 CONFIG_OF_CONTROL is enabled, the device tree will be scanned also
15 bool "Enable Driver Model for SPL"
18 Enable driver model in SPL. You will need to provide a
19 suitable malloc() implementation. If you are not using the
20 full malloc() enabled by CONFIG_SYS_SPL_MALLOC_START,
21 consider using CONFIG_SYS_MALLOC_SIMPLE. In that case you
22 must provide CONFIG_SYS_MALLOC_F_LEN to set the size.
23 In most cases driver model will only allocate a few uclasses
24 and devices in SPL, so 1KB should be enable. See
25 CONFIG_SYS_MALLOC_F_LEN for more details on how to enable it.
28 bool "Enable warnings in driver model"
32 The dm_warn() function can use up quite a bit of space for its
33 strings. By default this is disabled for SPL builds to save space.
34 This will cause dm_warn() to be compiled out - it will do nothing
37 config DM_DEVICE_REMOVE
38 bool "Support device removal"
42 We can save some code space by dropping support for removing a
43 device. This is not normally required in SPL, so by default this
44 option is disabled for SPL.
46 Note that this may have undesirable results in the USB subsystem as
47 it causes unplugged devices to linger around in the dm-tree, and it
48 causes USB host controllers to not be stopped when booting the OS.
51 bool "Support stdio registration"
55 Normally serial drivers register with stdio so that they can be used
56 as normal output devices. In SPL we don't normally use stdio, so
57 we can omit this feature.
60 bool "Support numbered aliases in device tree"
64 Most boards will have a '/aliases' node containing the path to
65 numbered devices (e.g. serial0 = &serial0). This feature can be
66 disabled if it is not required, to save code space in SPL.
69 bool "Support register maps"
72 Hardware peripherals tend to have one or more sets of registers
73 which can be accessed to control the hardware. A register map
74 models this with a simple read/write interface. It can in principle
75 support any bus type (I2C, SPI) but so far this only supports
79 bool "Support system controllers"
82 Many SoCs have a number of system controllers which are dealt with
83 as a group by a single driver. Some common functionality is provided
84 by this uclass, including accessing registers via regmap and
85 assigning a unique number to each.
88 bool "Managed device resources"
91 This option enables the Managed device resources core support.
92 Device resources managed by the devres framework are automatically
93 released whether initialization fails half-way or the device gets
96 If this option is disabled, devres functions fall back to
97 non-managed variants. For example, devres_alloc() to kzalloc(),
98 devm_kmalloc() to kmalloc(), etc.
101 bool "Managed device resources debugging functions"
104 If this option is enabled, devres debug messages are printed.
105 Also, a function is available to dump a list of device resources.
106 Select this if you are having a problem with devres or want to
107 debug resource management for a managed device.
109 If you are unsure about this, Say N here.
112 bool "Support simple-bus driver"
113 depends on DM && OF_CONTROL
116 Supports the 'simple-bus' driver, which is used on some systems.
118 config SPL_SIMPLE_BUS
119 bool "Support simple-bus driver in SPL"
120 depends on SPL_DM && SPL_OF_CONTROL
123 Supports the 'simple-bus' driver, which is used on some systems