1menu "Generic Driver Options" 2 3config DM 4 bool "Enable Driver Model" 5 help 6 This config option enables Driver Model. This brings in the core 7 support, including scanning of platform data on start-up. If 8 CONFIG_OF_CONTROL is enabled, the device tree will be scanned also 9 when available. 10 11config SPL_DM 12 bool "Enable Driver Model for SPL" 13 depends on DM && SPL 14 help 15 Enable driver model in SPL. You will need to provide a 16 suitable malloc() implementation. If you are not using the 17 full malloc() enabled by CONFIG_SYS_SPL_MALLOC_START, 18 consider using CONFIG_SYS_MALLOC_SIMPLE. In that case you 19 must provide CONFIG_SYS_MALLOC_F_LEN to set the size. 20 In most cases driver model will only allocate a few uclasses 21 and devices in SPL, so 1KB should be enable. See 22 CONFIG_SYS_MALLOC_F_LEN for more details on how to enable it. 23 24config DM_WARN 25 bool "Enable warnings in driver model" 26 depends on DM 27 default y 28 help 29 The dm_warn() function can use up quite a bit of space for its 30 strings. By default this is disabled for SPL builds to save space. 31 This will cause dm_warn() to be compiled out - it will do nothing 32 when called. 33 34config DM_DEVICE_REMOVE 35 bool "Support device removal" 36 depends on DM 37 default y 38 help 39 We can save some code space by dropping support for removing a 40 device. This is not normally required in SPL, so by default this 41 option is disabled for SPL. 42 43 Note that this may have undesirable results in the USB subsystem as 44 it causes unplugged devices to linger around in the dm-tree, and it 45 causes USB host controllers to not be stopped when booting the OS. 46 47config DM_STDIO 48 bool "Support stdio registration" 49 depends on DM 50 default y 51 help 52 Normally serial drivers register with stdio so that they can be used 53 as normal output devices. In SPL we don't normally use stdio, so 54 we can omit this feature. 55 56config DM_SEQ_ALIAS 57 bool "Support numbered aliases in device tree" 58 depends on DM 59 default y 60 help 61 Most boards will have a '/aliases' node containing the path to 62 numbered devices (e.g. serial0 = &serial0). This feature can be 63 disabled if it is not required, to save code space in SPL. 64 65config REGMAP 66 bool "Support register maps" 67 depends on DM 68 help 69 Hardware peripherals tend to have one or more sets of registers 70 which can be accessed to control the hardware. A register map 71 models this with a simple read/write interface. It can in principle 72 support any bus type (I2C, SPI) but so far this only supports 73 direct memory access. 74 75config SYSCON 76 bool "Support system controllers" 77 depends on REGMAP 78 help 79 Many SoCs have a number of system controllers which are dealt with 80 as a group by a single driver. Some common functionality is provided 81 by this uclass, including accessing registers via regmap and 82 assigning a unique number to each. 83 84config DEVRES 85 bool "Managed device resources" 86 depends on DM 87 help 88 This option enables the Managed device resources core support. 89 Device resources managed by the devres framework are automatically 90 released whether initialization fails half-way or the device gets 91 detached. 92 93 If this option is disabled, devres functions fall back to 94 non-managed variants. For example, devres_alloc() to kzalloc(), 95 devm_kmalloc() to kmalloc(), etc. 96 97config DEBUG_DEVRES 98 bool "Managed device resources debugging functions" 99 depends on DEVRES 100 help 101 If this option is enabled, devres debug messages are printed. 102 Also, a function is available to dump a list of device resources. 103 Select this if you are having a problem with devres or want to 104 debug resource management for a managed device. 105 106 If you are unsure about this, Say N here. 107 108config SIMPLE_BUS 109 bool "Support simple-bus driver" 110 depends on DM && OF_CONTROL 111 default y 112 help 113 Supports the 'simple-bus' driver, which is used on some systems. 114 115config SPL_SIMPLE_BUS 116 bool "Support simple-bus driver in SPL" 117 depends on SPL_DM && SPL_OF_CONTROL 118 default n 119 help 120 Supports the 'simple-bus' driver, which is used on some systems 121 in SPL. 122 123endmenu 124