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spi: Kconfig: Add help text

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Add detailed help text for SPI support.

Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
This commit is contained in:
Jagan Teki 2019-10-16 18:04:13 +05:30
parent 97009d543d
commit 0c8e605670
1 changed files with 17 additions and 0 deletions
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17
drivers/spi/Kconfig
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@ -1,5 +1,22 @@
menuconfig SPI menuconfig SPI
bool "SPI Support" 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 if SPI