From: Jagan Teki Date: Wed, 16 Oct 2019 12:34:13 +0000 (+0530) Subject: spi: Kconfig: Add help text X-Git-Tag: v2020.01-rc1~3^2~22 X-Git-Url: https://git.librecmc.org/?a=commitdiff_plain;h=0c8e605670fac186f225a957eb8e1a774cb17c41;p=oweals%2Fu-boot.git spi: Kconfig: Add help text Add detailed help text for SPI support. Signed-off-by: Jagan Teki --- 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