[PATCH] SPI: Freescale iMX SPI controller driver (BIS+)
Add the SPI controller driver for Freescale i.MX(S/L/1).
Main features summary:
> Per chip setup via board specific code and/or protocol driver.
> Per transfer setup.
> PIO transfers.
> DMA transfers.
> Managing of NULL tx / rx buffer for rd only / wr only transfers.
This patch replace patch-2.6.20-rc4-spi_imx with the following changes:
> Few cosmetic changes.
> Function map_dma_buffers now return 0 for success and -1 for failure.
> Solved a bug inside spi_imx_probe function (wrong error path).
> Solved a bug inside setup function (bad undo setup for max_speed_hz).
> For read-only transfers, always write zero bytes.
This is almost the same as the 'BIS' version sent by Andrea, except for
updating the 'DUMMY' byte so that read-only transfers shift out zeroes.
That part of the API changed recently, since some half duplex peripheral
chips require that semantic.
Signed-off-by: Andrea Paterniani <a.paterniani@swapp-eng.it>
Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/drivers/spi/Kconfig b/drivers/spi/Kconfig
index 2a2f44d..b217a65 100644
--- a/drivers/spi/Kconfig
+++ b/drivers/spi/Kconfig
@@ -75,6 +75,13 @@
inexpensive battery powered microcontroller evaluation board.
This same cable can be used to flash new firmware.
+config SPI_IMX
+ tristate "Freescale iMX SPI controller"
+ depends on SPI_MASTER && ARCH_IMX && EXPERIMENTAL
+ help
+ This enables using the Freescale iMX SPI controller in master
+ mode.
+
config SPI_MPC83xx
tristate "Freescale MPC83xx SPI controller"
depends on SPI_MASTER && PPC_83xx && EXPERIMENTAL
@@ -94,6 +101,7 @@
help
This hooks up to the MicroWire controller on OMAP1 chips.
+
config SPI_PXA2XX
tristate "PXA2xx SSP SPI master"
depends on SPI_MASTER && ARCH_PXA && EXPERIMENTAL