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CONFIG_SPI_GPIO: GPIO-based bitbanging SPI Master

General informations

The Linux kernel configuration item CONFIG_SPI_GPIO:

• prompt: GPIO-based bitbanging SPI Master
• type: tristate
• depends on: CONFIG_GPIOLIB
• defined in drivers/spi/Kconfig
• found in Linux kernels: 2.6.29–2.6.39, 3.0–3.9, 3.10-rc+HEAD
• modules built: spi-gpio, spi_gpio

Help text

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.

Hardware

LKDDb

Raw data from LKDDb:

• lkddb module spi-gpio CONFIG_SPI_GPIO : drivers/spi/Kconfig : "GPIO-based bitbanging SPI Master"
• lkddb module spi_gpio CONFIG_SPI_GPIO : drivers/spi/Kconfig : "GPIO-based bitbanging SPI Master"
• lkddb of "" "" "spi-gpio" : CONFIG_SPI CONFIG_SPI_GPIO : drivers/spi/spi-gpio.c
• lkddb platform "" : CONFIG_SPI CONFIG_SPI_GPIO : drivers/spi/spi-gpio.c
• lkddb platform "" : CONFIG_SPI CONFIG_SPI_GPIO : drivers/spi/spi_gpio.c
• lkddb platform "spi_gpio" : CONFIG_SPI CONFIG_SPI_GPIO : drivers/spi/spi-gpio.c

Sources

This page is automaticly generated with free (libre, open) software lkddb(see lkddb-sources).

The data is retrived from:

• Linux kernel
• Linux Kernel Driver DataBase (LKDDb)

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