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| author | Jagan Teki <jagan@amarulasolutions.com> | 2019-10-16 15:34:13 +0300 |
|---|---|---|
| committer | Jagan Teki <jagan@amarulasolutions.com> | 2019-10-24 22:18:31 +0300 |
| commit | 0c8e605670fac186f225a957eb8e1a774cb17c41 (patch) | |
| tree | 77ac8bdf27c70ddc14ec1c0f8d30b20a7298bb41 /drivers/spi/Kconfig | |
| parent | 97009d543dc1870c881b0ce6269fdffddf748085 (diff) | |
| download | u-boot-0c8e605670fac186f225a957eb8e1a774cb17c41.tar.xz | |
spi: Kconfig: Add help text
Add detailed help text for SPI support.
Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
Diffstat (limited to 'drivers/spi/Kconfig')
| -rw-r--r-- | drivers/spi/Kconfig | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/drivers/spi/Kconfig b/drivers/spi/Kconfig index b8ca2bdedd..0152dff74f 100644 --- a/drivers/spi/Kconfig +++ b/drivers/spi/Kconfig @@ -1,5 +1,22 @@ menuconfig SPI bool "SPI Support" + help + The "Serial Peripheral Interface" is a low level synchronous + protocol. Chips that support SPI can have data transfer rates + up to several tens of Mbit/sec. Chips are addressed with a + controller and a chipselect. Most SPI slaves don't support + dynamic device discovery; some are even write-only or read-only. + + SPI is widely used by microcontrollers to talk with sensors, + eeprom and flash memory, codecs and various other controller + chips, analog to digital (and d-to-a) converters, and more. + MMC and SD cards can be accessed using SPI protocol; and for + DataFlash cards used in MMC sockets, SPI must always be used. + + SPI is one of a family of similar protocols using a four wire + interface (select, clock, data in, data out) including Microwire + (half duplex), SSP, SSI, and PSP. This driver framework should + work with most such devices and controllers. if SPI |