[people/ms/u-boot.git] / drivers / core / Kconfig

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.
Commit	Line	Data
da333ae7 MY	1	config DM
da333ae7 MY	2	bool "Enable Driver Model"
da333ae7	3	help
f94a1bed SG	4	This config option enables Driver Model. This brings in the core
	5	support, including scanning of platform data on start-up. If
	6	CONFIG_OF_CONTROL is enabled, the device tree will be scanned also
	7	when available.
91a91ff8 SG	8
	9	config SPL_DM
	10	bool "Enable Driver Model for SPL"
	11	depends on DM && SPL
	12	help
	13	Enable driver model in SPL. You will need to provide a
	14	suitable malloc() implementation. If you are not using the
	15	full malloc() enabled by CONFIG_SYS_SPL_MALLOC_START,
	16	consider using CONFIG_SYS_MALLOC_SIMPLE. In that case you
	17	must provide CONFIG_SYS_MALLOC_F_LEN to set the size.
	18	In most cases driver model will only allocate a few uclasses
	19	and devices in SPL, so 1KB should be enable. See
	20	CONFIG_SYS_MALLOC_F_LEN for more details on how to enable it.
	21
	22	config DM_WARN
	23	bool "Enable warnings in driver model"
d648964f MY	24	depends on DM
d648964f MY	25	default y
91a91ff8 SG	26	help
	27	The dm_warn() function can use up quite a bit of space for its
	28	strings. By default this is disabled for SPL builds to save space.
	29	This will cause dm_warn() to be compiled out - it will do nothing
	30	when called.
91a91ff8 SG	31
	32	config DM_DEVICE_REMOVE
	33	bool "Support device removal"
d648964f MY	34	depends on DM
d648964f MY	35	default y
91a91ff8 SG	36	help
	37	We can save some code space by dropping support for removing a
	38	device. This is not normally required in SPL, so by default this
	39	option is disabled for SPL.
91a91ff8	40
e5c4564e HG	41	Note that this may have undesirable results in the USB subsystem as
	42	it causes unplugged devices to linger around in the dm-tree, and it
	43	causes USB host controllers to not be stopped when booting the OS.
	44
91a91ff8 SG	45	config DM_STDIO
91a91ff8 SG	46	bool "Support stdio registration"
d648964f MY	47	depends on DM
d648964f MY	48	default y
91a91ff8 SG	49	help
	50	Normally serial drivers register with stdio so that they can be used
	51	as normal output devices. In SPL we don't normally use stdio, so
	52	we can omit this feature.
36fa61dc SG	53
	54	config DM_SEQ_ALIAS
	55	bool "Support numbered aliases in device tree"
	56	depends on DM
	57	default y
	58	help
	59	Most boards will have a '/aliases' node containing the path to
	60	numbered devices (e.g. serial0 = &serial0). This feature can be
	61	disabled if it is not required, to save code space in SPL.
12dc8e75 SG	62
	63	config REGMAP
	64	bool "Support register maps"
	65	depends on DM
	66	help
	67	Hardware peripherals tend to have one or more sets of registers
	68	which can be accessed to control the hardware. A register map
	69	models this with a simple read/write interface. It can in principle
	70	support any bus type (I2C, SPI) but so far this only supports
	71	direct memory access.
	72
	73	config SYSCON
	74	bool "Support system controllers"
	75	depends on REGMAP
	76	help
	77	Many SoCs have a number of system controllers which are dealt with
	78	as a group by a single driver. Some common functionality is provided
	79	by this uclass, including accessing registers via regmap and
	80	assigning a unique number to each.
608f26c5	81
e2282d70 MY	82	config DEVRES
	83	bool "Managed device resources"
	84	depends on DM
	85	help
	86	This option enables the Managed device resources core support.
	87	Device resources managed by the devres framework are automatically
	88	released whether initialization fails half-way or the device gets
	89	detached.
	90
	91	If this option is disabled, devres functions fall back to
	92	non-managed variants. For example, devres_alloc() to kzalloc(),
	93	devm_kmalloc() to kmalloc(), etc.
	94
608f26c5	95	config DEBUG_DEVRES
40b6f2d0	96	bool "Managed device resources debugging functions"
e2282d70	97	depends on DEVRES
608f26c5 MY	98	help
608f26c5 MY	99	If this option is enabled, devres debug messages are printed.
40b6f2d0	100	Also, a function is available to dump a list of device resources.
608f26c5 MY	101	Select this if you are having a problem with devres or want to
	102	debug resource management for a managed device.
	103
	104	If you are unsure about this, Say N here.