diff options
Diffstat (limited to 'drivers/spi/Kconfig')
| -rw-r--r-- | drivers/spi/Kconfig | 18 |
1 files changed, 17 insertions, 1 deletions
diff --git a/drivers/spi/Kconfig b/drivers/spi/Kconfig index b9d0efb6803..4a6fe01831a 100644 --- a/drivers/spi/Kconfig +++ b/drivers/spi/Kconfig @@ -78,7 +78,7 @@ config SPI_AU1550 will be called au1550_spi. config SPI_BITBANG - tristate "Bitbanging SPI master" + tristate "Utilities for Bitbanging SPI masters" help With a few GPIO pins, your system can bitbang the SPI protocol. Select this to get SPI support through I/O pins (GPIO, parallel @@ -100,6 +100,22 @@ config SPI_BUTTERFLY inexpensive battery powered microcontroller evaluation board. This same cable can be used to flash new firmware. +config SPI_GPIO + tristate "GPIO-based bitbanging SPI Master" + depends on GENERIC_GPIO + select SPI_BITBANG + help + This simple GPIO bitbanging SPI master uses the arch-neutral GPIO + interface to manage MOSI, MISO, SCK, and chipselect signals. SPI + slaves connected to a bus using this driver are configured as usual, + except that the spi_board_info.controller_data holds the GPIO number + for the chipselect used by this controller driver. + + Note that this driver often won't achieve even 1 Mbit/sec speeds, + making it unusually slow for SPI. If your platform can inline + GPIO operations, you should be able to leverage that for better + speed with a custom version of this driver; see the source code. + config SPI_IMX tristate "Freescale iMX SPI controller" depends on ARCH_IMX && EXPERIMENTAL |