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path: root/drivers/spi/mxc_spi.c
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* linux/kernel.h: sync min, max, min3, max3 macros with LinuxMasahiro Yamada2014-11-23-1/+1
| | | | | | | | | | | | | | | | | | | | U-Boot has never cared about the type when we get max/min of two values, but Linux Kernel does. This commit gets min, max, min3, max3 macros synced with the kernel introducing type checks. Many of references of those macros must be fixed to suppress warnings. We have two options: - Use min, max, min3, max3 only when the arguments have the same type (or add casts to the arguments) - Use min_t/max_t instead with the appropriate type for the first argument Signed-off-by: Masahiro Yamada <yamada.m@jp.panasonic.com> Acked-by: Pavel Machek <pavel@denx.de> Acked-by: Lukasz Majewski <l.majewski@samsung.com> Tested-by: Lukasz Majewski <l.majewski@samsung.com> [trini: Fixup arch/blackfin/lib/string.c] Signed-off-by: Tom Rini <trini@ti.com>
* SPI: mxc_spi: delay initialisation until claim busMarkus Niebel2014-10-27-16/+21
| | | | | | | | | it is not correct to init for a specific slave in spi_setup_slave. instead buffer the values and delay init until spi_claim_bus. Signed-off-by: Markus Niebel <Markus.Niebel@tq-group.com> Acked-by: Stefano Babic <sbabic@denx.de> Reviewed-by: Jagannadha Sutradharudu Teki <jagannadh.teki@gmail.com>
* SPI: mxc_spi: remove second reset from ECSPI config handlerMarkus Niebel2014-10-27-3/+0
| | | | | | | | | | | | the second reset prevents other registers to be written. This will prevent to have the correct signal levels for SCLK before writing to the config reg in spi_xchg_single. Tested with GPIO based chipselect and SPI_MODE_3 on i.MX6S Signed-off-by: Markus Niebel <Markus.Niebel@tq-group.com> Acked-by: Stefano Babic <sbabic@denx.de> Reviewed-by: Jagannadha Sutradharudu Teki <jagannadh.teki@gmail.com>
* ARM: i.MX: provide declaration for board_spi_cs_gpioEric Nelson2014-10-21-0/+1
| | | | | | | | Provide a public declaration of the board_spi_cs_gpio() callback for i.MX SPI chip selects to prevent the warning "Should it be static?" when compiling with "make C=1". Signed-off-by: Eric Nelson <eric.nelson@boundarydevices.com>
* spi: mxc: fix sf probe when using mxc_spiNikita Kiryanov2014-09-24-23/+25
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | MXC SPI driver has a feature whereas a GPIO line can be used to force CS high across multiple transactions. This is set up by embedding the GPIO information in the CS value: cs = (cs | gpio << 8) This merge of cs and gpio data into one value breaks the sf probe command: if the use of gpio is required, invoking "sf probe <cs>" will not work, because the CS argument doesn't have the GPIO information in it. Instead, the user must use "sf probe <cs | gpio << 8>". For example, if bank 2 gpio 30 is used to force cs high on cs 0, bus 0, then instead of typing "sf probe 0" the user now must type "sf probe 15872". This is inconsistent with the description of the sf probe command, and forces the user to be aware of implementaiton details. Fix this by introducing a new board function: board_spi_cs_gpio(), which will accept a naked CS value, and provide the driver with the relevant GPIO, if one is necessary. Cc: Eric Nelson <eric.nelson@boundarydevices.com> Cc: Eric Benard <eric@eukrea.com> Cc: Fabio Estevam <fabio.estevam@freescale.com> Cc: Tim Harvey <tharvey@gateworks.com> Cc: Stefano Babic <sbabic@denx.de> Cc: Tom Rini <trini@ti.com> Cc: Marek Vasut <marex@denx.de> Reviewed-by: Marek Vasut <marex@denx.de> Signed-off-by: Nikita Kiryanov <nikita@compulab.co.il> Reviewed-by: Jagannadha Sutradharudu Teki <jaganna@xilinx.com>
* spi, spi_mxc: do not hang in spi_xchg_singleHeiko Schocher2014-08-06-2/+15
| | | | | | | | | if status register do never set MXC_CSPICTRL_TC, spi_xchg_single endless loops. Add a timeout here to prevent endless hang. Signed-off-by: Heiko Schocher <hs@denx.de> Cc: Dirk Behme <dirk.behme@gmail.com> Reviewed-by: Jagannadha Sutradharudu Teki <jaganna@xilinx.com>
* spi: spi-mxc: implement clk control for ECSPI to fix SPI_MODE_3Markus Niebel2014-02-18-2/+7
| | | | | | | | | | SPI_MODE_3 requires clk high when inactive. The SCLK_CTL field of the config reg was not configured in case of CPOL. Fix configuration so that SPI_MODE_3 which uses CPOL configures the clk line to be high in inactive state. Signed-off-by: Markus Niebel <Markus.Niebel@tqs.de> Reviewed-by: Jagannadha Sutradharudu Teki <jaganna@xilinx.com>
* spi: mxc_spi: Fix double incrementing read pointer for unaligned buffersTimo Herbrecher2013-10-16-1/+1
| | | | | | | | If dout buffer is not 32 bit-aligned or data to transmit is not multiple of 32 bit the read data pointer is already incremented on single byte reads. Signed-off-by: Timo Herbrecher <t.herbrecher@gateware.de> Signed-off-by: Jagannadha Sutradharudu Teki <jaganna@xilinx.com>
* Add GPL-2.0+ SPDX-License-Identifier to source filesWolfgang Denk2013-07-24-15/+1
| | | | | | Signed-off-by: Wolfgang Denk <wd@denx.de> [trini: Fixup common/cmd_io.c] Signed-off-by: Tom Rini <trini@ti.com>
* Merge branch 'master' of git://git.denx.de/u-boot-armTom Rini2013-07-12-17/+11
|\ | | | | | | | | | | | | | | | | | | Fix a trivial conflict in arch/arm/dts/exynos5250.dtsi about gpio and serial. Conflicts: arch/arm/dts/exynos5250.dtsi Signed-off-by: Tom Rini <trini@ti.com>
| * spi: mxc_spi: Update pre and post divider algorithmDirk Behme2013-06-26-18/+12
| | | | | | | | | | | | | | | | | | | | | | The spi clock divisor is of the form x * (2**y), or x << y, where x is 1 to 16, and y is 0 to 15. Note the similarity with floating point numbers. Convert the desired divisor to the smallest number which is >= desired divisor, and can be represented in this form. The previous algorithm chose a divisor which could be almost twice as large as needed. Signed-off-by: Troy Kisky <troy.kisky@boundarydevices.com> Signed-off-by: Dirk Behme <dirk.behme@gmail.com>
| * spi: mxc_spi: Fix pre and post divider calculationDirk Behme2013-06-26-3/+3
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Fix two issues with the calculation of pre_div and post_div: 1. pre_div: While the calculation of pre_div looks correct, to set the CONREG[15-12] bits pre_div needs to be decremented by 1: The i.MX 6Dual/6Quad Applications Processor Reference Manual (IMX6DQRM Rev. 0, 11/2012) states: CONREG[15-12]: PRE_DIVIDER 0000 Divide by 1 0001 Divide by 2 0010 Divide by 3 ... 1101 Divide by 14 1110 Divide by 15 1111 Divide by 16 I.e. if we want to divide by 2, we have to write 1 to CONREG[15-12]. 2. In case the post divider becomes necessary, pre_div will be divided by 16. So set pre_div to 16, too. And not 15. Both issues above are tested using the following examples: clk_src = 60000000 (60MHz, default i.MX6 ECSPI clock) a) max_hz == 23000000 (23MHz, max i.MX6 ECSPI read clock) -> pre_div = 3 (divide by 3 => CONREG[15-12] == 2) -> post_div = 0 (divide by 1 => CONREG[11- 8] == 0) => 60MHz / 3 = 20MHz SPI clock b) max_hz == 2000000 (2MHz) -> pre_div = 16 (divide by 16 => CONREG[15-12] == 15) -> post_div = 1 (divide by 2 => CONREG[11- 8] == 1) => 60MHz / 32 = 1.875MHz SPI clock c) max_hz == 1000000 (1MHz) -> pre_div = 16 (divide by 16 => CONREG[15-12] == 15) -> post_div = 2 (divide by 4 => CONREG[11- 8] == 2) => 60MHz / 64 = 937.5kHz SPI clock d) max_hz == 500000 (500kHz) -> pre_div = 16 (divide by 16 => CONREG[15-12] == 15) -> post_div = 3 (divide by 8 => CONREG[11- 8] == 3) => 60MHz / 128 = 468.75kHz SPI clock Signed-off-by: Dirk Behme <dirk.behme@gmail.com>
* | spi: mxc_spi: Use DIV_ROUND_UP at appropriate placesAxel Lin2013-06-22-3/+3
|/ | | | | | | This change slightly improves readability. Signed-off-by: Axel Lin <axel.lin@ingics.com> Reviewed-by: Jagannadha Sutradharudu Teki <jagannadh.teki@gmail.com>
* Merge branch 'u-boot-imx/master' into 'u-boot-arm/master'Albert ARIBAUD2013-04-14-8/+9
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| * spi: mxc_spi: Set master mode for all channelsFabio Estevam2013-04-13-8/+9
| | | | | | | | | | | | | | | | | | | | | | | | | | | | The glitch in the SPI clock line, which commit 3cea335c34 (spi: mxc_spi: Fix spi clock glitch durant reset) solved, is back now and itwas re-introduced by commit d36b39bf0d (spi: mxc_spi: Fix ECSPI reset handling). Actually the glitch is happening due to always toggling between slave mode and master mode by configuring the CHANNEL_MODE bits in this reset function. Since the spi driver only supports master mode, set the mode for all channels always to master mode in order to have a stable, "glitch-free" SPI clock line. Signed-off-by: Fabio Estevam <fabio.estevam@freescale.com>
* | Merge branch 'u-boot-imx/master' into 'u-boot-arm/master'Albert ARIBAUD2013-04-04-4/+4
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| * spi: mxc_spi: Fix ECSPI reset handlingDirk Behme2013-04-04-4/+4
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Reviewing the ECSPI reset handling shows two issues: 1. For the enable/reset bit (MXC_CSPICTRL_EN) in the control reg (ECSPIx_CONGREG) the i.MX6 technical reference manual states: -- cut -- ECSPIx_CONREG[0]: EN: Writing zero to this bit disables the block and resets the internal logic with the exception of the ECSPI_CONREG. -- cut -- Note the exception mentioned: The CONREG itself isn't reset. Fix this by manually writing the reset value 0 to the whole register. This sets the EN bit to zero, too (i.e. includes the old ~MXC_CSPICTRL_EN). 2. We want to reset the whole SPI block here. So it makes no sense to first read the old value of the CONREG and write it back, later. This will give us the old (historic/random) value of the CONREG back. And doesn't reset the CONREG. To get a clean CONREG after the reset of the block, too, don't use the old (historic/random) value of the CONREG while doing the reset. And read the clean CONREG after the reset. This was found while working on a SPI boot device where the i.MX6 boot ROM has already initialized the SPI block. The initialization by the boot ROM might be different to what the U-Boot driver wants to configure. I.e. we need a clean reset of SPI block, including the CONREG. Signed-off-by: Dirk Behme <dirk.behme@de.bosch.com> CC: Stefano Babic <sbabic@denx.de> CC: Fabio Estevam <fabio.estevam@freescale.com>
* | spi: Use spi_alloc_slave() in each SPI driverSimon Glass2013-03-19-3/+1
|/ | | | | | | | Rather than each driver having its own way to allocate a SPI slave, use the new allocation function everywhere. This will make it easier to extend the interface without breaking drivers. Signed-off-by: Simon Glass <sjg@chromium.org>
* spi: mxc_spi: Fix spi clock glitch durant resetFabio Estevam2012-11-19-2/+2
| | | | | | | | | | | Measuring the spi clock line on a scope shows a 'glitch' during the reset of the spi. Fix this by toggling only the MXC_CSPICTRL_EN bit, so that the clock line becomes always stable. Signed-off-by: Fabio Estevam <fabio.estevam@freescale.com> Acked-by: Stefano Babic <sbabic@denx.de>
* spi: mxc_spi: Fix handling of chip selectFabio Estevam2012-11-19-2/+3
| | | | | | | | | In decode_cs() function the polarity of the chip select must be taken into account. Also, for the case of low active chip select, the CS was activated too early. Signed-off-by: Fabio Estevam <fabio.estevam@freescale.com>
* spi: fix mxc_spi_slave structure allocation to clear memoryMatt Sealey2012-09-01-1/+1
| | | | | | | | | | | | | | | Use calloc() instead of malloc() to allocate the mxc_spi_slave structure. Clearing the memory is necessary since most of the time this gets done super early in boot, but on warm reboots, and when SPI probing is done long after the init stages it could actually pick up previously used memory, and things like the chipselect polarity and other data end up being filled with trash data if not explicitly set by the board files. This solves a semi-random, almost unreproducable error whereby SPI devices act very, very strangly on boot. Tested on Efika MX over several years.. Signed-off-by: Matt Sealey <matt@genesi-usa.com> Acked-by: Stefano Babic <sbabic@denx.de>
* mxc_spi: Round up clock dividerBenoît Thébaudeau2012-09-01-2/+2
| | | | | | | | | | | Since the input frequency of the API is a maximum that should not be exceeded in order for the devices to operate properly, the SPI clock divider should be rounded up, not truncated. Signed-off-by: Benoît Thébaudeau <benoit.thebaudeau@advansee.com> Cc: Wolfgang Denk <wd@denx.de> Cc: Stefano Babic <sbabic@denx.de> Acked-by: Stefano Babic <sbabic@denx.de>
* mxc_spi: move machine specifics into CPU headersEric Nelson2012-02-27-87/+6
| | | | | | | | | | | | | | Move (E)CSPI register declarations into the imx-regs.h files for each supported CPU Introduce two new macros to control conditional setup MXC_CSPI - Used for processors with the Configurable Serial Peripheral Interface (MX3x) MXC_ECSPI - For processors with Enhanced Configurable... (MX5x, MX6x) Signed-off-by: Eric Nelson <eric.nelson@boundarydevices.com> Acked-by: Dirk Behme <dirk.behme@de.bosch.com> Acked-by: Stefano Babic <sbabic@denx.de> Acked-by: Jason Liu <jason.hui@linaro.org> Tested-by: Jason Liu <jason.hui@linaro.org>
* IMX: uniform GPIO interface using GPIO frameworkStefano Babic2011-09-04-4/+4
| | | | | | | | | IMX processors has a slightly different interface to access GPIOs and do not make use of the provided GPIO framework. The patch substitutes mxc_ specific functions and make use of the API in asm/gpio.h Signed-off-by: Stefano Babic <sbabic@denx.de>
* MX31: Cleanup clock functionStefano Babic2011-07-18-2/+0
| | | | | | | The patch provide the same API used with other i.MX processors and get rid of mx31_ functions. Signed-off-by: Stefano Babic <sbabic@denx.de>
* mxc_spi.c: typo fixedHelmut Raiger2011-06-21-1/+1
| | | | Signed-off-by: Helmut Raiger <helmut.raiger@hale.at>
* IMX: MX31: Cleanup include files and drop nasty #ifdef in driversStefano Babic2011-04-27-7/+2
| | | | | | | | | | As exception among the i.MX processors, the i.MX31 has headers without general names (mx31-regs.h, mx31.h instead of imx-regs.h and clock.h). This requires several nasty #ifdef in the drivers to include the correct header. The patch cleans up the driver and renames the header files as for the other i.MX processors. Signed-off-by: Stefano Babic <sbabic@denx.de>
* SPI: mxc_spi: replace fixed offsets with structuresStefano Babic2011-02-02-66/+28
| | | | | | | | This patch cleans driver code replacing all accesses to registers with fixed offsets with a corresponding structure. Signed-off-by: Stefano Babic <sbabic@denx.de>
* SPI: mxc_spi: add SPI clock calculation and setup to the driverAnatolij Gustschin2011-02-02-1/+22
| | | | | | | | | | | | | The MXC SPI driver didn't calculate the SPI clock up to now and just used highest possible divider 512 for DATA RATE in the control register. This results in very low transfer rates. The patch adds code to calculate and setup the SPI clock frequency for transfers. Signed-off-by: Anatolij Gustschin <agust@denx.de> Signed-off-by: Stefano Babic <sbabic@denx.de>
* SPI: mxc_spi: fix swapping bug and add missing swapping in unaligned rx caseAnatolij Gustschin2011-02-02-5/+4
| | | | | | | | | | | | | | | We need to shift only one time in each cycle in the swapping loop for unaligned tx case. Currently two byte shift operations are performed in each loop cycle causing zero gaps in the transmited data, so not all data scheduled for transmition is actually transmited. The proper swapping in unaligned rx case is missing, so add it as we need to put the received data into the rx buffer in the correct byte order. Signed-off-by: Anatolij Gustschin <agust@denx.de> Tested-by: Stefano Babic <sbabic@denx.de>
* SPI: mxc_spi: add support for i.MX35 processorStefano Babic2011-02-02-24/+72
| | | | Signed-off-by: Stefano Babic <sbabic@denx.de>
* MXC: Fix byte-ordering in SPI driver for i.MX31/i.MX51Stefano Babic2010-09-30-38/+111
| | | | | | | | | | | | | | | | | | | | The actual SPI driver for i.MX31 and i.MX51 controller use a wrong byte ordering, because it is supposed to work only with Freescale's devices, as the Power Controllers (PMIC). The driver is not suitable for general purposes, because the buffers passed to spi_xfer must be 32-bit aligned, as it is used mainly to send integer to PMIC devices. The patch drops any kind of limitation and makes the driver useful with devices controlled sending commands composed by single bytes (or by a odd number of bytes), such as spi flash, sensor, etc. Because the byte ordering is changed, any current driver using this controller must be adapted, too. Signed-off-by: Stefano Babic <sbabic@denx.de>
* MXC: Correct SPI_CPOL setting in SPI driverStefano Babic2010-09-30-2/+2
| | | | | | | | | | | | | | | | The handling of the SPI_CPOL bit inside the SPI driver was wrong. As reported by the manual, the meaning of the SSPOL inside the configuration register is the same as reported by SPI specification (0 if low in idle, 1 is high on idle). The driver inverts this logic. Because this patch sets the logic as specified, it is required to clear the CPOL bit in the configuration file to adapt to the correct logic. Signed-off-by: Stefano Babic <sbabic@denx.de> Signed-off-by: David Jander <david.jander@protonic.nl>
* Use common function to set GPIOs for MX3 and MX5Stefano Babic2010-09-29-8/+7
| | | | | | | | | The patch adds support for setting gpios to the MX51 processor and change name to the corresponding functions for MX31. In this way, it is possible to get rid of nasty #ifdef switches related to the processor type. Signed-off-by: Stefano Babic <sbabic@denx.de>
* SPI: added support for MX51 to mxc_spiStefano Babic2010-05-05-20/+211
| | | | | | This patch add SPI support for the MX51 processor. Signed-off-by: Stefano Babic <sbabic@denx.de>
* SPI: Fix 32 bit transfers in mxc_spi.cMagnus Lilja2010-02-12-0/+9
| | | | | | | | | | | | | | Commit f9b6a1575d9f1ca192e4cb60e547aa66f08baa3f, "i.MX31: fix SPI driver for shorter than 32 bit" broke 32 bit transfers. This patch makes single 32 bit transfer work again. Transfer lengths that are known not to work will abort and print an error message. Tested on i.MX31 Litekit and i.MX31 PDK using 32 bit transfers to the MC13783/ATLAS chip (using the 'date' command). Signed-off-by: Magnus Lilja <lilja.magnus@gmail.com>
* i.MX31: support GPIO as a chip-select in the mxc_spi driverGuennadi Liakhovetski2009-02-24-8/+56
| | | | | | | | | Some SPI devices have special requirements on chip-select handling. With this patch we can use a GPIO as a chip-select and strictly follow the SPI_XFER_BEGIN and SPI_XFER_END flags. Signed-off-by: Guennadi Liakhovetski <lg@denx.de> Acked-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
* i.MX31: fix SPI driver for shorter than 32 bitGuennadi Liakhovetski2009-02-24-11/+20
| | | | | | | | Fix setting the SPI Control register, 8 and 16-bit transfers and a wrong pointer in the free routine in the mxc_spi driver. Signed-off-by: Guennadi Liakhovetski <lg@denx.de> Acked-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
* SPI API improvementsHaavard Skinnemoen2008-06-03-31/+57
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This patch gets rid of the spi_chipsel table and adds a handful of new functions that makes the SPI layer cleaner and more flexible. Instead of the spi_chipsel table, each board that wants to use SPI gets to implement three hooks: * spi_cs_activate(): Activates the chipselect for a given slave * spi_cs_deactivate(): Deactivates the chipselect for a given slave * spi_cs_is_valid(): Determines if the given bus/chipselect combination can be activated. Not all drivers may need those extra functions however. If that's the case, the board code may just leave them out (assuming they know what the driver needs) or rely on the linker to strip them out (assuming --gc-sections is being used.) To set up communication parameters for a given slave, the driver needs to call spi_setup_slave(). This returns a pointer to an opaque spi_slave struct which must be passed as a parameter to subsequent SPI calls. This struct can be freed by calling spi_free_slave(), but most driver probably don't want to do this. Before starting one or more SPI transfers, the driver must call spi_claim_bus() to gain exclusive access to the SPI bus and initialize the hardware. When all transfers are done, the driver must call spi_release_bus() to make the bus available to others, and possibly shut down the SPI controller hardware. spi_xfer() behaves mostly the same as before, but it now takes a spi_slave parameter instead of a spi_chipsel function pointer. It also got a new parameter, flags, which is used to specify chip select behaviour. This may be extended with other flags in the future. This patch has been build-tested on all powerpc and arm boards involved. I have not tested NIOS since I don't have a toolchain for it installed, so I expect some breakage there even though I've tried fixing up everything I could find by visual inspection. I have run-time tested this on AVR32 ATNGW100 using the atmel_spi and DataFlash drivers posted as a follow-up. I'd like some help testing other boards that use the existing SPI API. But most of all, I'd like some comments on the new API. Is this stuff usable for everyone? If not, why? Changed in v4: - Build fixes for various boards, drivers and commands - Provide common struct spi_slave definition that can be extended by drivers - Pass a struct spi_slave * to spi_cs_activate and spi_cs_deactivate - Make default bus and mode build-time configurable - Override default SPI bus ID and mode on mx32ads and imx31_litekit. Changed in v3: - Add opaque struct spi_slave for controller-specific data associated with a slave. - Add spi_claim_bus() and spi_release_bus() - Add spi_free_slave() - spi_setup() is now called spi_setup_slave() and returns a struct spi_slave - soft_spi now supports four SPI modes (CPOL|CPHA) - Add bus parameter to spi_setup_slave() - Convert the new i.MX32 SPI driver - Convert the new MC13783 RTC driver Changed in v2: - Convert the mpc8xxx_spi driver and the mpc8349emds board to the new API. Signed-off-by: Haavard Skinnemoen <hskinnemoen@atmel.com> Tested-by: Guennadi Liakhovetski <lg@denx.de>
* Big white-space cleanup.Wolfgang Denk2008-05-21-1/+1
| | | | | | | | | | | This commit gets rid of a huge amount of silly white-space issues. Especially, all sequences of SPACEs followed by TAB characters get removed (unless they appear in print statements). Also remove all embedded "vim:" and "vi:" statements which hide indentation problems. Signed-off-by: Wolfgang Denk <wd@denx.de>
* New i.MX31 SPI driverGuennadi Liakhovetski2008-04-18-0/+166
This is an SPI driver for i.MX and MXC based SoCs from Freescale. So far only implemented and tested on i.MX31, can with a modified register layout and definitions be used for i.MX27, I think, MXC CPUs have similar SPI controllers too. Signed-off-by: Guennadi Liakhovetski <lg@denx.de>
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