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menu "Generic Driver Options"
config DM
bool "Enable Driver Model"
help
This config option enables Driver Model. This brings in the core
support, including scanning of platform data on start-up. If
CONFIG_OF_CONTROL is enabled, the device tree will be scanned also
when available.
config SPL_DM
bool "Enable Driver Model for SPL"
depends on DM && SPL
help
Enable driver model in SPL. You will need to provide a
suitable malloc() implementation. If you are not using the
full malloc() enabled by CONFIG_SYS_SPL_MALLOC_START,
consider using CONFIG_SYS_MALLOC_SIMPLE. In that case you
must provide CONFIG_SYS_MALLOC_F_LEN to set the size.
In most cases driver model will only allocate a few uclasses
and devices in SPL, so 1KB should be enable. See
CONFIG_SYS_MALLOC_F_LEN for more details on how to enable it.
config DM_WARN
bool "Enable warnings in driver model"
depends on DM
default y
help
The dm_warn() function can use up quite a bit of space for its
strings. By default this is disabled for SPL builds to save space.
This will cause dm_warn() to be compiled out - it will do nothing
when called.
config DM_DEVICE_REMOVE
bool "Support device removal"
depends on DM
default y
help
We can save some code space by dropping support for removing a
device. This is not normally required in SPL, so by default this
option is disabled for SPL.
Note that this may have undesirable results in the USB subsystem as
it causes unplugged devices to linger around in the dm-tree, and it
causes USB host controllers to not be stopped when booting the OS.
config DM_STDIO
bool "Support stdio registration"
depends on DM
default y
help
Normally serial drivers register with stdio so that they can be used
as normal output devices. In SPL we don't normally use stdio, so
we can omit this feature.
config DM_SEQ_ALIAS
bool "Support numbered aliases in device tree"
depends on DM
default y
help
Most boards will have a '/aliases' node containing the path to
numbered devices (e.g. serial0 = &serial0). This feature can be
disabled if it is not required, to save code space in SPL.
config REGMAP
bool "Support register maps"
depends on DM
help
Hardware peripherals tend to have one or more sets of registers
which can be accessed to control the hardware. A register map
models this with a simple read/write interface. It can in principle
support any bus type (I2C, SPI) but so far this only supports
direct memory access.
config SYSCON
bool "Support system controllers"
depends on REGMAP
help
Many SoCs have a number of system controllers which are dealt with
as a group by a single driver. Some common functionality is provided
by this uclass, including accessing registers via regmap and
assigning a unique number to each.
config DEVRES
bool "Managed device resources"
depends on DM
help
This option enables the Managed device resources core support.
Device resources managed by the devres framework are automatically
released whether initialization fails half-way or the device gets
detached.
If this option is disabled, devres functions fall back to
non-managed variants. For example, devres_alloc() to kzalloc(),
devm_kmalloc() to kmalloc(), etc.
config DEBUG_DEVRES
bool "Managed device resources debugging functions"
depends on DEVRES
help
If this option is enabled, devres debug messages are printed.
Also, a function is available to dump a list of device resources.
Select this if you are having a problem with devres or want to
debug resource management for a managed device.
If you are unsure about this, Say N here.
config SIMPLE_BUS
bool "Support simple-bus driver"
depends on DM && OF_CONTROL
default y
help
Supports the 'simple-bus' driver, which is used on some systems.
config SPL_SIMPLE_BUS
bool "Support simple-bus driver in SPL"
depends on SPL_DM && SPL_OF_CONTROL
default n
help
Supports the 'simple-bus' driver, which is used on some systems
in SPL.
endmenu
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