1# 2# SPI driver configuration 3# 4# NOTE: the reason this doesn't show SPI slave support is mostly that 5# nobody's needed a slave side API yet. The master-role API is not 6# fully appropriate there, so it'd need some thought to do well. 7# 8menu "SPI support" 9 10config SPI 11 bool "SPI support" 12 help 13 The "Serial Peripheral Interface" is a low level synchronous 14 protocol. Chips that support SPI can have data transfer rates 15 up to several tens of Mbit/sec. Chips are addressed with a 16 controller and a chipselect. Most SPI slaves don't support 17 dynamic device discovery; some are even write-only or read-only. 18 19 SPI is widely used by microcontollers to talk with sensors, 20 eeprom and flash memory, codecs and various other controller 21 chips, analog to digital (and d-to-a) converters, and more. 22 MMC and SD cards can be accessed using SPI protocol; and for 23 DataFlash cards used in MMC sockets, SPI must always be used. 24 25 SPI is one of a family of similar protocols using a four wire 26 interface (select, clock, data in, data out) including Microwire 27 (half duplex), SSP, SSI, and PSP. This driver framework should 28 work with most such devices and controllers. 29 30config SPI_DEBUG 31 boolean "Debug support for SPI drivers" 32 depends on SPI && DEBUG_KERNEL 33 help 34 Say "yes" to enable debug messaging (like dev_dbg and pr_debug), 35 sysfs, and debugfs support in SPI controller and protocol drivers. 36 37# 38# MASTER side ... talking to discrete SPI slave chips including microcontrollers 39# 40 41config SPI_MASTER 42# boolean "SPI Master Support" 43 boolean 44 default SPI 45 help 46 If your system has an master-capable SPI controller (which 47 provides the clock and chipselect), you can enable that 48 controller and the protocol drivers for the SPI slave chips 49 that are connected. 50 51comment "SPI Master Controller Drivers" 52 depends on SPI_MASTER 53 54config SPI_BITBANG 55 tristate "Bitbanging SPI master" 56 depends on SPI_MASTER && EXPERIMENTAL 57 help 58 With a few GPIO pins, your system can bitbang the SPI protocol. 59 Select this to get SPI support through I/O pins (GPIO, parallel 60 port, etc). Or, some systems' SPI master controller drivers use 61 this code to manage the per-word or per-transfer accesses to the 62 hardware shift registers. 63 64 This is library code, and is automatically selected by drivers that 65 need it. You only need to select this explicitly to support driver 66 modules that aren't part of this kernel tree. 67 68config SPI_BUTTERFLY 69 tristate "Parallel port adapter for AVR Butterfly (DEVELOPMENT)" 70 depends on SPI_MASTER && PARPORT && EXPERIMENTAL 71 select SPI_BITBANG 72 help 73 This uses a custom parallel port cable to connect to an AVR 74 Butterfly <http://www.atmel.com/products/avr/butterfly>, an 75 inexpensive battery powered microcontroller evaluation board. 76 This same cable can be used to flash new firmware. 77 78config SPI_MPC83xx 79 tristate "Freescale MPC83xx SPI controller" 80 depends on SPI_MASTER && PPC_83xx && EXPERIMENTAL 81 select SPI_BITBANG 82 help 83 This enables using the Freescale MPC83xx SPI controller in master 84 mode. 85 86 Note, this driver uniquely supports the SPI controller on the MPC83xx 87 family of PowerPC processors. The MPC83xx uses a simple set of shift 88 registers for data (opposed to the CPM based descriptor model). 89 90config SPI_PXA2XX 91 tristate "PXA2xx SSP SPI master" 92 depends on SPI_MASTER && ARCH_PXA && EXPERIMENTAL 93 help 94 This enables using a PXA2xx SSP port as a SPI master controller. 95 The driver can be configured to use any SSP port and additional 96 documentation can be found a Documentation/spi/pxa2xx. 97 98config SPI_S3C24XX_GPIO 99 tristate "Samsung S3C24XX series SPI by GPIO" 100 depends on SPI_MASTER && ARCH_S3C2410 && SPI_BITBANG && EXPERIMENTAL 101 help 102 SPI driver for Samsung S3C24XX series ARM SoCs using 103 GPIO lines to provide the SPI bus. This can be used where 104 the inbuilt hardware cannot provide the transfer mode, or 105 where the board is using non hardware connected pins. 106# 107# Add new SPI master controllers in alphabetical order above this line 108# 109 110 111config SPI_S3C24XX 112 tristate "Samsung S3C24XX series SPI" 113 depends on SPI_MASTER && ARCH_S3C2410 && EXPERIMENTAL 114 help 115 SPI driver for Samsung S3C24XX series ARM SoCs 116 117# 118# There are lots of SPI device types, with sensors and memory 119# being probably the most widely used ones. 120# 121comment "SPI Protocol Masters" 122 depends on SPI_MASTER 123 124 125# 126# Add new SPI protocol masters in alphabetical order above this line 127# 128 129 130# (slave support would go here) 131 132endmenu # "SPI support" 133 134