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_SPL_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_SPL_SYS_MALLOC_F_LEN for more details on how to enable it. config TPL_DM bool "Enable Driver Model for TPL" depends on DM && TPL help Enable driver model in TPL. 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_SPL_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 enough. See CONFIG_SPL_SYS_MALLOC_F_LEN for more details on how to enable it. Disable this for very small implementations. config DM_WARN bool "Enable warnings in driver model" depends on DM default y help Enable this to see warnings related to driver model. Warnings may help with debugging, such as when expected devices do not bind correctly. If the option is disabled, dm_warn() is compiled out - it will do nothing when called. config SPL_DM_WARN bool "Enable warnings in driver model wuth SPL" depends on SPL_DM help Enable this to see warnings related to driver model in SPL 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. Warnings may help with debugging, such as when expected devices do not bind correctly. If the option is disabled, dm_warn() is compiled out - it will do nothing when called. config DM_DEBUG bool "Enable debug messages in driver model core" depends on DM help Say Y here if you want to compile in debug messages in DM core. 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. 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 SPL_DM_DEVICE_REMOVE bool "Support device removal in SPL" depends on SPL_DM default n 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. 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. config SPL_DM_SEQ_ALIAS bool "Support numbered aliases in device tree in SPL" depends on SPL_DM default n 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 SPL_DM_INLINE_OFNODE bool "Inline some ofnode functions which are seldom used in SPL" depends on SPL_DM default y help This applies to several ofnode functions (see ofnode.h) which are seldom used. Inlining them can help reduce code size. config TPL_DM_INLINE_OFNODE bool "Inline some ofnode functions which are seldom used in TPL" depends on TPL_DM default y help This applies to several ofnode functions (see ofnode.h) which are seldom used. Inlining them can help reduce code size. config DM_DMA bool "Support per-device DMA constraints" depends on DM default n help Enable this to extract per-device DMA constraints, only supported on device-tree systems for now. This is needed in order translate addresses on systems where different buses have different views of the physical address space. 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 SPL_REGMAP bool "Support register maps in SPL" depends on SPL_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 TPL_REGMAP bool "Support register maps in TPL" depends on TPL_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 SPL_SYSCON bool "Support system controllers in SPL" depends on SPL_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 TPL_SYSCON bool "Support system controllers in TPL" depends on TPL_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 y help Supports the 'simple-bus' driver, which is used on some systems in SPL. config SIMPLE_BUS_CORRECT_RANGE bool "Decode the 'simple-bus' by honoring the #address-cells and #size-cells" depends on SIMPLE_BUS help Decoding the 'simple-bus' by honoring the #address-cells and #size-cells of parent/child bus. If unset, #address-cells of parent bus is assumed to be 1, #address-cells and #size-cells of child bus is also assumed to be 1, to save some spaces of using an advanced API to decode the , which benefits SPL image builds that have size limits. If you are unsure about this, Say N here. config SIMPLE_PM_BUS bool "Support simple-pm-bus driver" depends on DM && OF_CONTROL && CLK && POWER_DOMAIN help Supports the 'simple-pm-bus' driver, which is used for busses that have power domains and/or clocks which need to be enabled before use. config OF_TRANSLATE bool "Translate addresses using fdt_translate_address" depends on DM && OF_CONTROL default y help If this option is enabled, the reg property will be translated using the fdt_translate_address() function. This is necessary on some platforms (e.g. MVEBU) using complex "ranges" properties in many nodes. As this translation is not handled correctly in the default simple_bus_translate() function. If this option is not enabled, simple_bus_translate() will be used for the address translation. This function is faster and smaller in size than fdt_translate_address(). config OF_TRANSLATE_ZERO_SIZE_CELLS bool "Enable translation for zero size cells" depends on OF_TRANSLATE default n help The routine used to translate an FDT address into a physical CPU address was developed by IBM. It considers that crossing any level with #size-cells = <0> makes translation impossible, even if it is not the way it was specified. Enabling this option makes translation possible even in the case of crossing levels with #size-cells = <0>. config SPL_OF_TRANSLATE bool "Translate addresses using fdt_translate_address in SPL" depends on SPL_DM && SPL_OF_CONTROL default n help If this option is enabled, the reg property will be translated using the fdt_translate_address() function. This is necessary on some platforms (e.g. MVEBU) using complex "ranges" properties in many nodes. As this translation is not handled correctly in the default simple_bus_translate() function. If this option is not enabled, simple_bus_translate() will be used for the address translation. This function is faster and smaller in size than fdt_translate_address(). config TRANSLATION_OFFSET bool "Platforms specific translation offset" depends on DM && OF_CONTROL help Some platforms need a special address translation. Those platforms (e.g. mvebu in SPL) can configure a translation offset by enabling this option and setting the translation_offset variable in the GD in their platform- / board-specific code. config OF_ISA_BUS bool depends on OF_TRANSLATE help Is this option is enabled then support for the ISA bus will be included for addresses read from DT. This is something that should be known to be required or not based upon the board being targeted, and whether or not it makes use of an ISA bus. The bus is matched based upon its node name equalling "isa". The busses #address-cells should equal 2, with the first cell being used to hold flags & flag 0x1 indicating that the address range should be accessed using I/O port in/out accessors. The second cell holds the offset into ISA bus address space. The #size-cells property should equal 1, and of course holds the size of the address range used by a device. If this option is not enabled then support for the ISA bus is not included and any such busses used in DT will be treated as typical simple-bus compatible busses. This will lead to mistranslation of device addresses, so ensure that this is enabled if your board does include an ISA bus. config DM_DEV_READ_INLINE bool default y if !OF_LIVE config ACPIGEN bool "Support ACPI table generation in driver model" default y if SANDBOX || (GENERATE_ACPI_TABLE && !QEMU) help This option enables generation of ACPI tables using driver-model devices. It adds a new operation struct to each driver, to support things like generating device-specific tables and returning the ACPI name of a device. config BOUNCE_BUFFER bool "Include bounce buffer API" help Some peripherals support DMA from a subset of physically addressable memory only. To support such peripherals, the bounce buffer API uses a temporary buffer: it copies data to/from DMA regions while managing cache operations. A second possible use of bounce buffers is their ability to provide aligned buffers for DMA operations. endmenu