[J-u-boot.git] / dts / Kconfig

#
# Device Tree Control
#

config SUPPORT_OF_CONTROL
	bool

menu "Device Tree Control"
	depends on SUPPORT_OF_CONTROL

config OF_CONTROL
	bool "Run-time configuration via Device Tree"
	help
	  This feature provides for run-time configuration of U-Boot
	  via a flattened device tree.

config OF_BOARD_FIXUP
	bool "Board-specific manipulation of Device Tree"
	help
	  In certain circumstances it is necessary to be able to modify
	  U-Boot's device tree (e.g. to delete device from it). This option
	  make the Device Tree writeable and provides a board-specific
	  "board_fix_fdt" callback (called during pre-relocation time), which
	  enables the board initialization to modifiy the Device Tree. The
	  modified copy is subsequently used by U-Boot after relocation.

config SPL_OF_CONTROL
	bool "Enable run-time configuration via Device Tree in SPL"
	depends on SPL && OF_CONTROL
	help
	  Some boards use device tree in U-Boot but only have 4KB of SRAM
	  which is not enough to support device tree. Enable this option to
	  allow such boards to be supported by U-Boot SPL.

choice
	prompt "Provider of DTB for DT control"
	depends on OF_CONTROL

config OF_SEPARATE
	bool "Separate DTB for DT control"
	depends on !SANDBOX
	help
	  If this option is enabled, the device tree will be built and
	  placed as a separate u-boot.dtb file alongside the U-Boot image.

config OF_EMBED
	bool "Embedded DTB for DT control"
	help
	  If this option is enabled, the device tree will be picked up and
	  built into the U-Boot image. This is suitable for local debugging
	  and development only and is not recommended for production devices.
	  Boards in the mainline U-Boot tree should not use it.

config OF_HOSTFILE
	bool "Host filed DTB for DT control"
	depends on SANDBOX
	help
	  If this option is enabled, DTB will be read from a file on startup.
	  This is only useful for Sandbox.  Use the -d flag to U-Boot to
	  specify the file to read.

endchoice

config DEFAULT_DEVICE_TREE
	string "Default Device Tree for DT control"
	depends on OF_CONTROL
	help
	  This option specifies the default Device Tree used for DT control.
	  It can be overridden from the command line:
	  $ make DEVICE_TREE=<device-tree-name>

config OF_LIST
	string "List of device tree files to include for DT control"
	depends on SPL_LOAD_FIT
	default DEFAULT_DEVICE_TREE
	help
	  This option specifies a list of device tree files to use for DT
	  control. These will be packaged into a FIT. At run-time, SPL will
	  select the correct DT to use by examining the hardware (e.g.
	  reading a board ID value). This is a list of device tree files
	  (without the directory or .dtb suffix) separated by <space>.

config OF_SPL_REMOVE_PROPS
	string "List of device tree properties to drop for SPL"
	depends on SPL_OF_CONTROL
	default "interrupt-parent" if SPL_PINCTRL && SPL_CLK
	default "clocks clock-names interrupt-parent" if SPL_PINCTRL
	default "pinctrl-0 pinctrl-names interrupt-parent" if SPL_CLK
	default "pinctrl-0 pinctrl-names clocks clock-names interrupt-parent"
	help
	  Since SPL normally runs in a reduced memory space, the device tree
	  is cut down to only what is needed to load and start U-Boot. Only
	  nodes marked with the property "u-boot,dm-pre-reloc" will be
	  included. In addition, some properties are not used by U-Boot and
	  can be discarded. This option defines the list of properties to
	  discard.

config SPL_OF_PLATDATA
	bool "Generate platform data for use in SPL"
	depends on SPL_OF_CONTROL
	help
	  For very constrained SPL environments the overhead of decoding
	  device tree nodes and converting their contents into platform data
	  is too large. This overhead includes libfdt code as well as the
	  device tree contents itself. The latter is fairly compact, but the
	  former can add 3KB or more to a Thumb 2 Image.

	  This option enables generation of platform data from the device
	  tree as C code. This code creates devices using U_BOOT_DEVICE()
	  declarations. The benefit is that it allows driver code to access
	  the platform data directly in C structures, avoidin the libfdt
	  overhead.

	  This option works by generating C structure declarations for each
	  compatible string, then adding platform data and U_BOOT_DEVICE
	  declarations for each node. See README.platdata for more
	  information.

endmenu
Commit	Line	Data
783e6a72 MY	1	#
	2	# Device Tree Control
	3	#
783e6a72 MY	4
	5	config SUPPORT_OF_CONTROL
	6	bool
	7
	8	menu "Device Tree Control"
783e6a72 MY	9	depends on SUPPORT_OF_CONTROL
	10
	11	config OF_CONTROL
	12	bool "Run-time configuration via Device Tree"
	13	help
	14	This feature provides for run-time configuration of U-Boot
	15	via a flattened device tree.
	16
2a792753	17	config OF_BOARD_FIXUP
	18	bool "Board-specific manipulation of Device Tree"
	19	help
	20	In certain circumstances it is necessary to be able to modify
	21	U-Boot's device tree (e.g. to delete device from it). This option
	22	make the Device Tree writeable and provides a board-specific
	23	"board_fix_fdt" callback (called during pre-relocation time), which
	24	enables the board initialization to modifiy the Device Tree. The
	25	modified copy is subsequently used by U-Boot after relocation.
	26
dffb86e4 MY	27	config SPL_OF_CONTROL
	28	bool "Enable run-time configuration via Device Tree in SPL"
	29	depends on SPL && OF_CONTROL
2860f03b SG	30	help
	31	Some boards use device tree in U-Boot but only have 4KB of SRAM
	32	which is not enough to support device tree. Enable this option to
	33	allow such boards to be supported by U-Boot SPL.
	34
783e6a72 MY	35	choice
	36	prompt "Provider of DTB for DT control"
	37	depends on OF_CONTROL
	38
	39	config OF_SEPARATE
	40	bool "Separate DTB for DT control"
	41	depends on !SANDBOX
	42	help
	43	If this option is enabled, the device tree will be built and
	44	placed as a separate u-boot.dtb file alongside the U-Boot image.
	45
	46	config OF_EMBED
	47	bool "Embedded DTB for DT control"
	48	help
	49	If this option is enabled, the device tree will be picked up and
3d3f60cb SG	50	built into the U-Boot image. This is suitable for local debugging
	51	and development only and is not recommended for production devices.
	52	Boards in the mainline U-Boot tree should not use it.
783e6a72 MY	53
	54	config OF_HOSTFILE
	55	bool "Host filed DTB for DT control"
	56	depends on SANDBOX
	57	help
	58	If this option is enabled, DTB will be read from a file on startup.
	59	This is only useful for Sandbox. Use the -d flag to U-Boot to
	60	specify the file to read.
	61
	62	endchoice
	63
f1ef2b62 MY	64	config DEFAULT_DEVICE_TREE
f1ef2b62 MY	65	string "Default Device Tree for DT control"
70d41093	66	depends on OF_CONTROL
f1ef2b62 MY	67	help
f1ef2b62 MY	68	This option specifies the default Device Tree used for DT control.
5699ea6d	69	It can be overridden from the command line:
f1ef2b62 MY	70	$ make DEVICE_TREE=<device-tree-name>
f1ef2b62 MY	71
cdf17246 SG	72	config OF_LIST
	73	string "List of device tree files to include for DT control"
	74	depends on SPL_LOAD_FIT
c409bd01	75	default DEFAULT_DEVICE_TREE
cdf17246 SG	76	help
	77	This option specifies a list of device tree files to use for DT
	78	control. These will be packaged into a FIT. At run-time, SPL will
	79	select the correct DT to use by examining the hardware (e.g.
	80	reading a board ID value). This is a list of device tree files
	81	(without the directory or .dtb suffix) separated by <space>.
	82
fa78e0a3 SG	83	config OF_SPL_REMOVE_PROPS
fa78e0a3 SG	84	string "List of device tree properties to drop for SPL"
897705ec	85	depends on SPL_OF_CONTROL
239ae4a9 VM	86	default "interrupt-parent" if SPL_PINCTRL && SPL_CLK
239ae4a9 VM	87	default "clocks clock-names interrupt-parent" if SPL_PINCTRL
5f3f7b79	88	default "pinctrl-0 pinctrl-names interrupt-parent" if SPL_CLK
fa78e0a3 SG	89	default "pinctrl-0 pinctrl-names clocks clock-names interrupt-parent"
	90	help
	91	Since SPL normally runs in a reduced memory space, the device tree
	92	is cut down to only what is needed to load and start U-Boot. Only
	93	nodes marked with the property "u-boot,dm-pre-reloc" will be
	94	included. In addition, some properties are not used by U-Boot and
	95	can be discarded. This option defines the list of properties to
	96	discard.
	97
2789ddb9 SG	98	config SPL_OF_PLATDATA
	99	bool "Generate platform data for use in SPL"
	100	depends on SPL_OF_CONTROL
	101	help
	102	For very constrained SPL environments the overhead of decoding
	103	device tree nodes and converting their contents into platform data
	104	is too large. This overhead includes libfdt code as well as the
	105	device tree contents itself. The latter is fairly compact, but the
	106	former can add 3KB or more to a Thumb 2 Image.
	107
	108	This option enables generation of platform data from the device
	109	tree as C code. This code creates devices using U_BOOT_DEVICE()
	110	declarations. The benefit is that it allows driver code to access
	111	the platform data directly in C structures, avoidin the libfdt
	112	overhead.
	113
	114	This option works by generating C structure declarations for each
	115	compatible string, then adding platform data and U_BOOT_DEVICE
	116	declarations for each node. See README.platdata for more
	117	information.
	118
783e6a72	119	endmenu