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path: root/drivers/spi/spi-davinci.c
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2016-04-29spi: davinci: Use dma_request_chan() for requesting DMA channelPeter Ujfalusi1-52/+24
With the new dma_request_chan() the client driver does not need to look for the DMA resource and it does not need to pass filter_fn anymore. By switching to the new API the driver can now support deferred probing against DMA. Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com> Signed-off-by: Mark Brown <broonie@kernel.org>
2015-12-12spi: davinci: use dev_err() for error reportingSekhar Nori1-7/+7
Use dev_err() for reporting errors rather than dev_dbg(). Signed-off-by: Sekhar Nori <nsekhar@ti.com> Signed-off-by: Mark Brown <broonie@kernel.org>
2015-12-12spi: davinci: fix spurious i/o errorSekhar Nori1-1/+2
davinci_spi_bufs() uses wait_for_completion_interruptible() without bothering to handle -ERESTARTSYS. Due to this, sometime, it returns prematurely when a signal is received. Since the return value is never checked, userspace eventually receives a spurious -EIO. To fix this, use un-interruptible wait_for_completion_timeout(). Signed-off-by: Sekhar Nori <nsekhar@ti.com> Signed-off-by: Mark Brown <broonie@kernel.org>
2015-11-04Merge remote-tracking branch 'spi/topic/davinci' into spi-nextMark Brown1-11/+4
2015-10-16spi: davinci: use spi->cs_gpio directlyLuis de Bethencourt1-11/+4
Use spi->cs_gpio directly to remove the following build warning: drivers/spi/spi-davinci.c:219:6: warning: 'gpio' may be used uninitialized in this function Signed-off-by: Luis de Bethencourt <luisbg@osg.samsung.com> Suggested-by: Geert Uytterhoeven <geert@linux-m68k.org> Signed-off-by: Mark Brown <broonie@kernel.org>
2015-09-25spi: davinci: fix handling platform_get_irq resultAndrzej Hajda1-3/+4
The function can return negative value. The problem has been detected using proposed semantic patch scripts/coccinelle/tests/assign_signed_to_unsigned.cocci [1]. [1]: http://permalink.gmane.org/gmane.linux.kernel/2046107 Signed-off-by: Andrzej Hajda <a.hajda@samsung.com> Signed-off-by: Mark Brown <broonie@kernel.org>
2015-07-24spi: davinci: Choose correct pre-scaler limit based on SOCFranklin S Cooper Jr1-7/+36
Currently the pre-scaler limit is incorrect. The value differs slightly for various devices so a single value can't be used. Using the compatible field select the correct pre-scaler limit. Add new compatible field value for Keystone devices to support their unique pre-scaler limit value. Signed-off-by: Franklin S Cooper Jr <fcooper@ti.com> Reviewed-by: Sekhar Nori <nsekhar@ti.com> Signed-off-by: Mark Brown <broonie@kernel.org>
2015-07-24spi: davinci: Set prescale value based on register valueFranklin S Cooper Jr1-4/+5
Within davinci_spi_get_prescale() the prescale has two meanings. First one being the calculated prescale value and then at the end translates it to the prescale value that will be written to the SPI register. At first glance this can be confusing especially when comparing the minimum prescale value against what is seen in the TRM. To simplify things make it clear that the calculated prescale value will always be based on the value that will be written into the SPI register. Signed-off-by: Franklin S Cooper Jr <fcooper@ti.com> Signed-off-by: Mark Brown <broonie@kernel.org>
2015-06-10spi: davinci: change the lower limit of pre-scale divider to 1Murali Karicheri1-1/+1
SPI hardware spec for Keystone specify a lower value of 0 for pre-scale divider which determine what max value of spi clock (spi-max-frequency) the device can support. This translates to a clock divider of 2. So fix the lower limit value used for the boundary check in davinci_spi_get_prescale() function to 1 so that a maximum of spi device clock rate / 2 is possible to be set for spi-max-frequency. Signed-off-by: Murali Karicheri <m-karicheri2@ti.com> Acked-by: Sekhar Nori <nsekhar@ti.com> Signed-off-by: Mark Brown <broonie@kernel.org>
2014-12-22spi: Remove FSF mailing addressesJarkko Nikula1-4/+0
Signed-off-by: Jarkko Nikula <jarkko.nikula@linux.intel.com> Signed-off-by: Mark Brown <broonie@kernel.org>
2014-10-20spi: drop owner assignment from platform_driversWolfram Sang1-1/+0
A platform_driver does not need to set an owner, it will be populated by the driver core. Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
2014-10-03Merge remote-tracking branches 'spi/topic/davinci', 'spi/topic/doc', ↵Mark Brown1-7/+48
'spi/topic/dw' and 'spi/topic/fsl' into spi-next
2014-10-03Merge remote-tracking branches 'spi/topic/bcm53xx', 'spi/topic/cadence', ↵Mark Brown1-2/+6
'spi/topic/checkpatch' and 'spi/topic/clps711x' into spi-next
2014-09-16Merge remote-tracking branches 'spi/fix/davinci', 'spi/fix/dw', ↵Mark Brown1-14/+25
'spi/fix/fsl', 'spi/fix/pl022', 'spi/fix/rockchip' and 'spi/fix/sirf' into spi-linus
2014-09-16spi: davinci: add support for adding delay between word's transmissionsMurali Karicheri1-7/+48
This patch adds ability to configure delay between transmission of words over SPI bus if it's required by SPI slave devices. New optional SPI slave property: - ti,spi-word-delay : delay between transmission of words (SPIFMTn.WDELAY, SPIDAT1.WDEL) Signed-off-by: Murali Karicheri <m-karicheri2@ti.com> Signed-off-by: Grygorii Strashko <grygorii.strashko@ti.com> Signed-off-by: Mark Brown <broonie@kernel.org>
2014-09-16spi: davinci: remove empty function davinci_spi_cleanupGrygorii Strashko1-5/+0
Remove empty function davinci_spi_cleanup(). Signed-off-by: Grygorii Strashko <grygorii.strashko@ti.com> Signed-off-by: Mark Brown <broonie@kernel.org>
2014-09-13spi: davinci: request cs_gpio's from probeGrygorii Strashko1-9/+25
Now CS GPIOs are requested from struct spi_master.setup() callback and that causes failures when Client SPI device is getting accessed through SPIDEV driver. The failure happens, because .setup() callback may be called many times from IOCTL handler and when it's called second time gpio_request() will fail and return -EBUSY. Hence, fix it by moving CS GPIOs requesting code in .probe(). Reported-by: Murali Karicheri <m-karicheri2@ti.com> Signed-off-by: Grygorii Strashko <grygorii.strashko@ti.com> Signed-off-by: Mark Brown <broonie@kernel.org>
2014-09-03spi: davinci: Fix checkpatch issueJingoo Han1-2/+6
Fix the following checkpatch warnings. WARNING: Missing a blank line after declarations WARNING: quoted string split across lines Signed-off-by: Jingoo Han <jg1.han@samsung.com> Signed-off-by: Mark Brown <broonie@kernel.org>
2014-08-21spi: davinci: fix SPI_NO_CS functionalityGrygorii Strashko1-8/+8
The driver should not touch CS lines if SPI_NO_CS flag is set. This patch fixes it as this functionality was broken accidentally by commit a88e34ea213e1b ("spi: davinci: add support to configure gpio cs through dt"). Fixes: a88e34ea213e1b ("spi: davinci: add support to configure gpio cs through dt") Signed-off-by: Grygorii Strashko <grygorii.strashko@ti.com> Signed-off-by: Mark Brown <broonie@linaro.org>
2014-08-01spi: davinci: use spi_device.cs_gpio to store gpio cs per spi deviceGrygorii Strashko1-37/+17
Rework Davinci SPI driver to store GPIO CS number in cs_gpio field of SPI device structure (spi_device) for both DT and non-DT cases. This will make Davinci SPI driver code simpler and allows to reuse more SPI core functionality. Signed-off-by: Grygorii Strashko <grygorii.strashko@ti.com> Signed-off-by: Mark Brown <broonie@linaro.org>
2014-08-01spi: davinci: add support to configure gpio cs through dtMurali Karicheri1-8/+56
Currently driver supports only configuration of GPIO CS through platform data. This patch enhances the driver to configure GPIO CS through DT. Also update the DT binding documentation to reflect the availability of cs-gpios. Signed-off-by: Murali Karicheri <m-karicheri2@ti.com> Signed-off-by: Grygorii Strashko <grygorii.strashko@ti.com> Signed-off-by: Mark Brown <broonie@linaro.org>
2014-07-31spi: davinci: fix to support more than 2 chip selectsMurali Karicheri1-3/+9
Currently, the driver defines SPI_MAX_CHIPSELECT as 2 and use per device array bytes_per_word based on this. This breaks if num_chipselect per device is greater than 2. This patch fix this and allocate memory for this array based on num_chipselect. It's preparation patch to enable GPIO CS feature for Davinci SPI. Signed-off-by: Murali Karicheri <m-karicheri2@ti.com> Signed-off-by: Grygorii Strashko <grygorii.strashko@ti.com> Signed-off-by: Mark Brown <broonie@linaro.org>
2014-02-06spi: davinci: Use of_match_ptr at appropriate placeAxel Lin1-4/+2
It's pointless to use of_match_ptr within CONFIG_OF guard. Use of_match_ptr around davinci_spi_of_match when setting .of_match_table. Signed-off-by: Axel Lin <axel.lin@ingics.com> Signed-off-by: Mark Brown <broonie@linaro.org>
2014-02-06spi: davinci: Remove unneeded NULL checking for dspi and dspi->bitbang.masterAxel Lin1-8/+0
spi_master_get_devdata() never returns NULL when spi_alloc_master() success, so remove NULL test for dspi. We have ensured master is not NULL before assigning it to dspi->bitbang.master. So also remove NULL test for dspi->bitbang.master. Signed-off-by: Axel Lin <axel.lin@ingics.com> Signed-off-by: Mark Brown <broonie@linaro.org>
2014-01-23Merge remote-tracking branches 'spi/topic/bcm2835', 'spi/topic/bcm63xx', ↵Mark Brown1-36/+13
'spi/topic/bcm63xx-hsspi', 'spi/topic/bitbang', 'spi/topic/bpw', 'spi/topic/clps711x', 'spi/topic/coldfire', 'spi/topic/davinci', 'spi/topic/dw' and 'spi/topic/falcon' into spi-linus
2014-01-17spi: Remove duplicate code to set default bits_per_word settingAxel Lin1-4/+0
The implementation in spi_setup() already set spi->bits_per_word = 8 when spi->bits_per_word is 0 before calling spi->master->setup. So we don't need to do it again in setup() callback. Signed-off-by: Axel Lin <axel.lin@ingics.com> Acked-by: Marek Vasut <marex@denx.de> Acked-by: Barry Song <Baohua.Song@csr.com> Acked-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Mark Brown <broonie@linaro.org>
2013-12-17spi: davinci: Use devm_*() functionsJingoo Han1-30/+11
Use devm_*() functions to make cleanup paths simpler. Signed-off-by: Jingoo Han <jg1.han@samsung.com> Signed-off-by: Mark Brown <broonie@linaro.org>
2013-11-24spi: davinci: Fix the build warning with CONFIG_ARM_LPAE=ySantosh Shilimkar1-2/+2
With CONFIG_ARM_LPAE=y spi driver throws below warning drivers/spi/spi-davinci.c: In function ‘davinci_spi_probe’: drivers/spi/spi-davinci.c:965:3: warning: format ‘%d’ expects argument of type ‘int’, but argument 3 has type ‘resource_size_t’ [-Wformat] drivers/spi/spi-davinci.c:965:3: warning: format ‘%d’ expects argument of type ‘int’, but argument 4 has type ‘resource_size_t’ [-Wformat] Lets use '%pa' to properly print 'resource_size_t' type variables. Signed-off-by: Santosh Shilimkar <santosh.shilimkar@ti.com> Signed-off-by: Mark Brown <broonie@linaro.org>
2013-11-15tree-wide: use reinit_completion instead of INIT_COMPLETIONWolfram Sang1-1/+1
Use this new function to make code more comprehensible, since we are reinitialzing the completion, not initializing. [akpm@linux-foundation.org: linux-next resyncs] Signed-off-by: Wolfram Sang <wsa@the-dreams.de> Acked-by: Linus Walleij <linus.walleij@linaro.org> (personally at LCE13) Cc: Ingo Molnar <mingo@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2013-10-25Merge remote-tracking branch 'spi/topic/davinci' into spi-nextMark Brown1-1/+2
2013-09-17spi: bitbang: Let spi_bitbang_start() take a reference to masterAxel Lin1-6/+4
Many drivers that use bitbang library have a leak on probe error paths. This is because once a spi_master_get() call succeeds, we need an additional spi_master_put() call to free the memory. Fix this issue by moving the code taking a reference to master to spi_bitbang_start(), so spi_bitbang_start() will take a reference to master on success. With this change, the caller is responsible for calling spi_bitbang_stop() to decrement the reference and spi_master_put() as counterpart of spi_alloc_master() to prevent a memory leak. So now we have below patten for drivers using bitbang library: probe: spi_alloc_master -> Init reference count to 1 spi_bitbang_start -> Increment reference count remove: spi_bitbang_stop -> Decrement reference count spi_master_put -> Decrement reference count (reference count reaches 0) Fixup all users accordingly. Signed-off-by: Axel Lin <axel.lin@ingics.com> Suggested-by: Uwe Kleine-Koenig <u.kleine-koenig@pengutronix.de> Acked-by: Uwe Kleine-Koenig <u.kleine-koenig@pengutronix.de> Signed-off-by: Mark Brown <broonie@linaro.org>
2013-09-17spi: spi-davinci: Fix variable typeSachin Kamat1-1/+2
'prescale' contains the return value of davinci_spi_get_prescale() which is a signed integer. Convert 'prescale' to integer to silence the following warning: drivers/spi/spi-davinci.c:318 davinci_spi_setup_transfer() warn: unsigned 'prescale' is never less than zero. Signed-off-by: Sachin Kamat <sachin.kamat@linaro.org> Signed-off-by: Mark Brown <broonie@linaro.org>
2013-09-01Merge remote-tracking branch 'spi/topic/pdata' into spi-nextMark Brown1-2/+2
2013-08-29spi: use dev_get_platdata()Jingoo Han1-2/+2
Use the wrapper function for retrieving the platform data instead of accessing dev->platform_data directly. Signed-off-by: Jingoo Han <jg1.han@samsung.com> Signed-off-by: Mark Brown <broonie@linaro.org>
2013-07-29spi: spi-davinci: Fix direction in dma_map_single()Christian Eggers1-1/+1
Commit 048177ce3b3962852fd34a7e04938959271c7e70 (spi: spi-davinci: convert to DMA engine API) introduced a regression: dma_map_single() is called with direction DMA_FROM_DEVICE for rx and for tx. Signed-off-by: Christian Eggers <ceggers@gmx.de> Acked-by: Matt Porter <mporter@ti.com> Signed-off-by: Mark Brown <broonie@linaro.org> Cc: stable@vger.kernel.org # v3.7.x+
2013-06-26Merge remote-tracking branch 'spi/topic/pdata' into spi-nextMark Brown1-2/+2
2013-05-29spi: convert drivers to use bits_per_word_maskStephen Warren1-4/+4
Fill in the recently added spi_master.bits_per_word_mask field in as many drivers as possible. Make related cleanups, such as removing any redundant error-checking, or empty setup callbacks. Signed-off-by: Stephen Warren <swarren@wwwdotorg.org> Acked-by: H Hartley Sweeten <hsweeten@visionengravers.com> Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
2013-05-23spi: use platform_{get,set}_drvdata()Jingoo Han1-2/+2
Use the wrapper functions for getting and setting the driver data using platform_device instead of using dev_{get,set}_drvdata() with &pdev->dev, so we can directly pass a struct platform_device. Signed-off-by: Jingoo Han <jg1.han@samsung.com> Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
2013-05-13Merge remote-tracking branch 'spi/fix/grant' into spi-linusMark Brown1-1/+1
2013-04-17spi/davinci: no wildcards in DT compatible propertyManjunathappa, Prakash1-2/+2
Follow DT naming convention for compatible property of the blob. Use first chip name that introduced the specific version of the device. Signed-off-by: Manjunathappa, Prakash <prakash.pm@ti.com> Acked-by: Grant Likely <grant.likely@secretlab.ca> Signed-off-by: Sekhar Nori <nsekhar@ti.com>
2013-04-07spi/davinci: fix module build errorManjunathappa, Prakash1-1/+1
Fix below module build error: CC [M] drivers/spi/spi-davinci.o drivers/spi/spi-davinci.c:774:1: error: '__mod_of_device_table' aliased to undefined symbol 'davini_spi_of_match' drivers/spi/spi-davinci.c:774:1: error: '__mod_of_device_table' aliased to undefined symbol 'davini_spi_of_match' make[2]: *** [drivers/spi/spi-davinci.o] Error 1 make[1]: *** [drivers/spi] Error 2 make[1]: *** Waiting for unfinished jobs.... make: *** [drivers] Error 2 Signed-off-by: Manjunathappa, Prakash <prakash.pm@ti.com> Acked-by: Sekhar Nori <nsekhar@ti.com> Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
2013-02-05spi/davinci: use request_threaded_irq() to fix deadlockMurali Karicheri1-2/+15
With RT pre-empt patch applied to Linux kernel, the irq handler will be force converted to an irq thread. spi driver can get back to back messages from the slave device. In such cases, IRQ thread doesn't get a chance to run to read the slave data. Hence the irq handler must be run in hard irq context to read/write data from slave device. Otherwise, the kernel goes into a deadlock. This patch fixes this issue when PREEMPT_RT_FULL is enabled in the kernel. A dummy thread function is provided to satisfy the request_threaded_irq() API. Passing a NULL for function also causes the irq handler to be executed in the thread context. Signed-off-by: Murali Karicheri <m-karicheri2@ti.com> Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
2013-02-05spi/davinci: add OF support for the spi controllerMurali Karicheri1-14/+88
This adds OF support to DaVinci SPI controller to configure platform data through device bindings. Also replaces clk_enable() with of clk_prepare_enable() as well as clk_disable() with clk_disable_unprepare(). Signed-off-by: Murali Karicheri <m-karicheri2@ti.com> Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
2012-12-07spi: Remove HOTPLUG section attributesGrant Likely1-3/+3
CONFIG_HOTPLUG is going away as an option. As result the __dev* markings will be going away. Remove use of __devinit, __devexit_p, __devinitdata, __devinitconst, and __devexit. Bill Pemberton has done most of the legwork on this series. I've used his script to purge the attributes from the drivers/gpio tree. Reported-by: Bill Pemberton <wfp5p@virginia.edu> Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
2012-10-10Merge branch 'next' of git://git.infradead.org/users/vkoul/slave-dmaLinus Torvalds1-162/+130
Pull slave-dmaengine updates from Vinod Koul: "This time we have Andy updates on dw_dmac which is attempting to make this IP block available as PCI and platform device though not fully complete this time. We also have TI EDMA moving the dma driver to use dmaengine APIs, also have a new driver for mmp-tdma, along with bunch of small updates. Now for your excitement the merge is little unusual here, while merging the auto merge on linux-next picks wrong choice for pl330 (drivers/dma/pl330.c) and this causes build failure. The correct resolution is in linux-next. (DMA: PL330: Fix build error) I didn't back merge your tree this time as you are better than me so no point in doing that for me :)" Fixed the pl330 conflict as in linux-next, along with trivial header file conflicts due to changed includes. * 'next' of git://git.infradead.org/users/vkoul/slave-dma: (29 commits) dma: tegra: fix interrupt name issue with apb dma. dw_dmac: fix a regression in dwc_prep_dma_memcpy dw_dmac: introduce software emulation of LLP transfers dw_dmac: autoconfigure data_width or get it via platform data dw_dmac: autoconfigure block_size or use platform data dw_dmac: get number of channels from hardware if possible dw_dmac: fill optional encoded parameters in register structure dw_dmac: mark dwc_dump_chan_regs as inline DMA: PL330: return ENOMEM instead of 0 from pl330_alloc_chan_resources DMA: PL330: Remove redundant runtime_suspend/resume functions DMA: PL330: Remove controller clock enable/disable dmaengine: use kmem_cache_zalloc instead of kmem_cache_alloc/memset DMA: PL330: Set the capability of pdm0 and pdm1 as DMA_PRIVATE ARM: EXYNOS: Set the capability of pdm0 and pdm1 as DMA_PRIVATE dma: tegra: use list_move_tail instead of list_del/list_add_tail mxs/dma: Enlarge the CCW descriptor area to 4 pages dw_dmac: utilize slave_id to pass request line dmaengine: mmp_tdma: add dt support dmaengine: mmp-pdma support spi: davici - make davinci select edma ...
2012-09-14ARM: davinci: move platform_data definitionsArnd Bergmann1-1/+1
Platform data for device drivers should be defined in include/linux/platform_data/*.h, not in the architecture and platform specific directories. This moves such data out of the davinci include directories Signed-off-by: Arnd Bergmann <arnd@arndb.de> Acked-by: Mark Brown <broonie@opensource.wolfsonmicro.com> Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Acked-by: Nicolas Pitre <nico@linaro.org> Acked-by: Mauro Carvalho Chehab <mchehab@redhat.com> Acked-by: Felipe Balbi <balbi@ti.com> Cc: Sekhar Nori <nsekhar@ti.com> Cc: Kevin Hilman <khilman@ti.com> Cc: "Ben Dooks" <ben-linux@fluff.org> Cc: "Wolfram Sang" <w.sang@pengutronix.de> Cc: Dmitry Torokhov <dmitry.torokhov@gmail.com> Cc: Chris Ball <cjb@laptop.org> Cc: David Woodhouse <dwmw2@infradead.org> Cc: Grant Likely <grant.likely@secretlab.ca> Cc: Alan Stern <stern@rowland.harvard.edu> Cc: Liam Girdwood <lrg@ti.com> Cc: davinci-linux-open-source@linux.davincidsp.com
2012-09-01spi: spi-davinci: convert to DMA engine APIMatt Porter1-162/+130
Removes use of the DaVinci EDMA private DMA API and replaces it with use of the DMA engine API. Signed-off-by: Matt Porter <mporter@ti.com> Tested-by: Tom Rini <trini@ti.com> Tested-by: Sekhar Nori <nsekhar@ti.com> Signed-off-by: Vinod Koul <vinod.koul@linux.intel.com>
2012-03-30spi/davinci: Fix DMA API usage in davinciShubhrajyoti D1-3/+3
The driver uses NULL for dma_unmap_single instead of the struct device that the API expects. Signed-off-by: Shubhrajyoti D <shubhrajyoti@ti.com> Tested-by: Akshay Shankarmurthy <akshay.s@ti.com> Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
2011-10-25drivercore: Add helper macro for platform_driver boilerplateGrant Likely1-15/+5
For simple modules that contain a single platform_driver without any additional setup code then ends up being a block of duplicated boilerplate. This patch adds a new macro, module_platform_driver(), which replaces the module_init()/module_exit() registrations with template functions. Signed-off-by: Grant Likely <grant.likely@secretlab.ca> Acked-by: Greg Kroah-Hartman <gregkh@suse.de> Reviewed-by: Magnus Damm <magnus.damm@gmail.com> Reviewed-by: Mark Brown <broonie@opensource.wolfsonmicro.com> Reviewed-by: Stephen Boyd <sboyd@codeaurora.org>
2011-06-06spi: reorganize driversGrant Likely1-0/+1030
Sort the SPI makefile and enforce the naming convention spi_*.c for spi drivers. This change also rolls the contents of atmel_spi.h into the .c file since there is only one user of that particular include file. v2: - Use 'spi-' prefix instead of 'spi_' to match what seems to be be the predominant pattern for subsystem prefixes. - Clean up filenames in Kconfig and header comment blocks Signed-off-by: Grant Likely <grant.likely@secretlab.ca> Acked-by: Wolfram Sang <w.sang@pengutronix.de> Acked-by: Linus Walleij <linus.walleij@linaro.org>
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