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spi: imx: add lpspi bus driver

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This patch adds lpspi driver to support new i.MX products which use
lpspi instead of ecspi.

The lpspi can continue operating in stop mode when an appropriate
clock is available. It is also designed for low CPU overhead with
DMA offloading of FIFO register accesses.

Signed-off-by: Gao Pan <pandy.gao@nxp.com>
Reviewed-by: Fugang Duan <B38611@freescale.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Gao Pan
2016-11-22 21:52:17 +08:00
committed by Mark Brown
parent 1001354ca3
commit 5314987de5
3 changed files with 519 additions and 0 deletions
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6
drivers/spi/Kconfig
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@@ -264,6 +264,12 @@ config SPI_FALCON
has only been tested with m25p80 type chips. The hardware has no
support for other types of SPI peripherals.
config SPI_FSL_LPSPI
tristate "Freescale i.MX LPSPI controller"
depends on ARCH_MXC || COMPILE_TEST
help
This enables Freescale i.MX LPSPI controllers in master mode.
config SPI_GPIO
tristate "GPIO-based bitbanging SPI Master"
depends on GPIOLIB || COMPILE_TEST

1
drivers/spi/Makefile
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@@ -43,6 +43,7 @@ obj-$(CONFIG_SPI_FSL_CPM) += spi-fsl-cpm.o
obj-$(CONFIG_SPI_FSL_DSPI) += spi-fsl-dspi.o
obj-$(CONFIG_SPI_FSL_LIB) += spi-fsl-lib.o
obj-$(CONFIG_SPI_FSL_ESPI) += spi-fsl-espi.o
obj-$(CONFIG_SPI_FSL_LPSPI) += spi-fsl-lpspi.o
obj-$(CONFIG_SPI_FSL_SPI) += spi-fsl-spi.o
obj-$(CONFIG_SPI_GPIO) += spi-gpio.o
obj-$(CONFIG_SPI_IMG_SPFI) += spi-img-spfi.o

512
drivers/spi/spi-fsl-lpspi.c Normal file
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