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path: root/drivers/spi/spi-ti-qspi.c
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2019-08-02spi: Remove dev_err() usage after platform_get_irq()Stephen Boyd
We don't need dev_err() messages when platform_get_irq() fails now that platform_get_irq() prints an error message itself when something goes wrong. Let's remove these prints with a simple semantic patch. // <smpl> @@ expression ret; struct platform_device *E; @@ ret = ( platform_get_irq(E, ...) | platform_get_irq_byname(E, ...) ); if ( \( ret < 0 \| ret <= 0 \) ) { ( -if (ret != -EPROBE_DEFER) -{ ... -dev_err(...); -... } | ... -dev_err(...); ) ... } // </smpl> While we're here, remove braces on if statements that only have one statement (manually). Cc: Mark Brown <broonie@kernel.org> Cc: linux-spi@vger.kernel.org Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Stephen Boyd <swboyd@chromium.org> Link: https://lore.kernel.org/r/20190730181557.90391-42-swboyd@chromium.org Signed-off-by: Mark Brown <broonie@kernel.org>
2019-06-05treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 296Thomas Gleixner
Based on 1 normalized pattern(s): this program is free software you can redistribute it and or modify it under the terms of the gplv2 this program is distributed in the hope that it will be useful but without any warranty without even the implied warranty of merchantability or fitness for a particular purpose see the gnu general public license for more details extracted by the scancode license scanner the SPDX license identifier GPL-2.0-only has been chosen to replace the boilerplate/reference in 1 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Alexios Zavras <alexios.zavras@intel.com> Reviewed-by: Allison Randal <allison@lohutok.net> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190529141901.986607096@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-01-29spi: ti-qspi: Fix mmap read when more than one CS in useVignesh R
Commit 4dea6c9b0b64 ("spi: spi-ti-qspi: add mmap mode read support") has has got order of parameter wrong when calling regmap_update_bits() to select CS for mmap access. Mask and value arguments are interchanged. Code will work on a system with single slave, but fails when more than one CS is in use. Fix this by correcting the order of parameters when calling regmap_update_bits(). Fixes: 4dea6c9b0b64 ("spi: spi-ti-qspi: add mmap mode read support") Cc: stable@vger.kernel.org Signed-off-by: Vignesh R <vigneshr@ti.com> Signed-off-by: Mark Brown <broonie@kernel.org>
2018-05-17spi: ti-qspi: Make sure res_mmap != NULL before dereferencing itBoris Brezillon
resource_size() is dereferencing the res without checking that it is not NULL, so we need to do the check before calling resource_size(). Fixes: b95cb394ab59 ("spi: ti-qspi: Implement the spi_mem interface") Reported-by: Dan Carpenter <dan.carpenter@oracle.com> Signed-off-by: Boris Brezillon <boris.brezillon@bootlin.com> Signed-off-by: Mark Brown <broonie@kernel.org>
2018-05-11spi: Get rid of the spi_flash_read() APIBoris Brezillon
This API has been replaced by the spi_mem_xx() one, its only user (spi-nor) has been converted to spi_mem_xx() and all SPI controller drivers that were implementing the ->spi_flash_xxx() hooks are also implementing the spi_mem ones. So we can safely get rid of this API. Signed-off-by: Boris Brezillon <boris.brezillon@bootlin.com> Reviewed-by: Frieder Schrempf <frieder.schrempf@exceet.de> Tested-by: Frieder Schrempf <frieder.schrempf@exceet.de> Signed-off-by: Mark Brown <broonie@kernel.org>
2018-05-11spi: ti-qspi: Implement the spi_mem interfaceBoris Brezillon
The spi_mem interface is meant to replace the spi_flash_read() one. Implement the ->exec_op() method so that we can smoothly get rid of the old interface. Signed-off-by: Boris Brezillon <boris.brezillon@bootlin.com> Reviewed-by: Vignesh R <vigneshr@ti.com> Tested-by: Vignesh R <vigneshr@ti.com> Signed-off-by: Mark Brown <broonie@kernel.org>
2017-04-26Merge remote-tracking branches 'spi/topic/ti-qspi' and 'spi/topic/xlp' into ↵Mark Brown
spi-next
2017-04-21spi: spi-ti-qspi: Use bounce buffer if read buffer is not DMA'bleVignesh R
Flash filesystems like JFFS2, UBIFS and MTD block layer can provide vmalloc'd or kmap'd buffers that cannot be mapped using dma_map_sg() and can potentially be in memory region above 32bit addressable region(ie buffers belonging to memory region backed by LPAE) of DMA, implement spi_flash_can_dma() interface to inform SPI core not to map such buffers. When buffers are not mapped for DMA, then use a pre allocated bounce buffer(64K = typical flash erase sector size) to read from flash and then do a copy to actual destination buffer. This is approach is much faster than using memcpy using CPU and also reduces CPU load. With this patch, UBIFS read speed is ~18MB/s and CPU utilization <20% on DRA74 Rev H EVM. Performance degradation is negligible when compared with non bounce buffer case while using UBIFS. Signed-off-by: Vignesh R <vigneshr@ti.com> Signed-off-by: Mark Brown <broonie@kernel.org>
2017-03-27spi: spi-ti-qspi: Remove unused dma_dev variableVignesh R
commit 1351aaeb50b2 ("spi: spi-ti-qspi: Use dma_engine wrapper for dma memcpy call") introduced this warning: drivers/spi/spi-ti-qspi.c: In function 'ti_qspi_dma_xfer': drivers/spi/spi-ti-qspi.c:398:21: warning: unused variable 'dma_dev' [-Wunused-variable] struct dma_device *dma_dev = chan->device; Fix it by removing the unused variable. Signed-off-by: Vignesh R <vigneshr@ti.com> Reported-by: Stephen Rothwell <sfr@canb.auug.org.au> Signed-off-by: Mark Brown <broonie@kernel.org>
2017-03-24spi: spi-ti-qspi: Use dma_engine wrapper for dma memcpy callVignesh R
Instead of calling device_prep_dma_memcpy() directly with dma_device pointer, use the newly introduced dmaengine_prep_dma_memcpy() wrapper API. Signed-off-by: Vignesh R <vigneshr@ti.com> Signed-off-by: Mark Brown <broonie@kernel.org>
2017-02-19spi: spi-ti-qspi: Fix error handlingChristophe JAILLET
'dma_request_chan_by_mask()' can not return NULL. Try to keep the logic in 'no_dma:' by resetting 'qspi->rx_chan' in case of error. Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr> Signed-off-by: Mark Brown <broonie@kernel.org>
2017-02-17spi: ti-qspi: revise ti_qspi_probe() failure flowPrahlad V
call spi_master_put() in case of failures after spi_alloc_master(). call pm_runtime_disable() in case of failures after pm_runtime_enable(). Signed-off-by: Prahlad V <prahlad.eee@gmail.com> Signed-off-by: Mark Brown <broonie@kernel.org>
2016-11-15spi: spi-ti-qspi: reinit of completion variablePrahlad V
completion variable should be reinitialized before reusing. Signed-off-by: Prahlad V <prahlad.eee@gmail.com> Signed-off-by: Mark Brown <broonie@kernel.org>
2016-08-17spi: spi-ti-qspi: Add DMA support for QSPI mmap readVignesh R
Use mem-to-mem DMA to read from flash when reading in mmap mode. This gives improved read performance and reduces CPU load. With this patch the raw-read throughput is ~16MB/s on DRA74 EVM. And CPU load is <20%. UBIFS read throughput ~13 MB/s. Signed-off-by: Vignesh R <vigneshr@ti.com> Signed-off-by: Mark Brown <broonie@kernel.org>
2016-07-24Merge remote-tracking branches 'spi/topic/spidev', 'spi/topic/sunxi', ↵Mark Brown
'spi/topic/ti-qspi', 'spi/topic/topcliff-pch' and 'spi/topic/txx9' into spi-next
2016-06-26spi: ti-qspi: spelling mistake: "trasnfers" -> "transfers"Colin Ian King
trivial fix to spelling mistake in dev_dbg message Signed-off-by: Colin Ian King <colin.king@canonical.com> Signed-off-by: Mark Brown <broonie@kernel.org>
2016-05-31spi: spi-ti-qspi: Suspend the queue before removing the deviceJean-Jacques Hiblot
Before disabling the pm_runtime, we must ensure that there is no transfer in progress nor will a new one be started. Otherwise the message pump will fail and in the end, the process requesting the transfer will be stuck. This behavior has been observed when transferring data from a SPI flash with dd while removing the module on a DRA7x-evm. Signed-off-by: Jean-Jacques Hiblot <jjhiblot@ti.com> Signed-off-by: Mark Brown <broonie@kernel.org>
2016-04-13spi: spi-ti-qspi: Handle truncated frames properlyBen Hutchings
We clamp frame_len_words to a maximum of 4096, but do not actually limit the number of words written or read through the DATA registers or the length added to spi_message::actual_length. This results in silent data corruption for commands longer than this maximum. Recalculate the length of each transfer, taking frame_len_words into account. Use this length in qspi_{read,write}_msg(), and to increment spi_message::actual_length. Signed-off-by: Ben Hutchings <ben.hutchings@codethink.co.uk> Signed-off-by: Mark Brown <broonie@kernel.org> Cc: stable@vger.kernel.org
2016-04-13spi: spi-ti-qspi: Fix FLEN and WLEN settings if bits_per_word is overriddenBen Hutchings
Each transfer can specify 8, 16 or 32 bits per word independently of the default for the device being addressed. However, currently we calculate the number of words in the frame assuming that the word size is the device default. If multiple transfers in the same message have differing bits_per_word, we bitwise-or the different values in the WLEN register field. Fix both of these. Also rename 'frame_length' to 'frame_len_words' to make clear that it's not a byte count like spi_message::frame_length. Signed-off-by: Ben Hutchings <ben.hutchings@codethink.co.uk> Signed-off-by: Mark Brown <broonie@kernel.org> Cc: stable@vger.kernel.org
2016-02-09spi: spi-ti-qspi: add mmap mode read supportVignesh R
ti-qspi controller provides mmap port to read data from SPI flashes. mmap port is enabled in QSPI_SPI_SWITCH_REG. ctrl module register may also need to be accessed for some SoCs. The QSPI_SPI_SETUP_REGx needs to be populated with flash specific information like read opcode, read mode(quad, dual, normal), address width and dummy bytes. Once, controller is in mmap mode, the whole flash memory is available as a memory region at SoC specific address. This region can be accessed using normal memcpy() (or mem-to-mem dma copy). The ti-qspi controller hardware will internally communicate with SPI flash over SPI bus and get the requested data. Implement spi_flash_read() callback to support mmap read over SPI flash devices. With this, the read throughput increases from ~100kB/s to ~2.5 MB/s. Signed-off-by: Vignesh R <vigneshr@ti.com> Signed-off-by: Mark Brown <broonie@kernel.org>
2015-11-04Merge remote-tracking branches 'spi/topic/s3c64xx', 'spi/topic/ti-qspi' and ↵Mark Brown
'spi/topic/txx9' into spi-next
2015-10-30spi: ti-qspi: improve ->remove() callbackFelipe Balbi
there's no need to call pm_runtime_get_sync() followed by pm_runtime_put(). We should, instead, just call pm_runtime_put_sync() and pm_runtime_disable(). Signed-off-by: Felipe Balbi <balbi@ti.com> Signed-off-by: Mark Brown <broonie@kernel.org>
2015-10-16spi: spi-ti-qspi: switch to polling mode for better r/w performanceVignesh R
Currently word completion interrupt is fired for transfer of every word(8bit to 128bit in size). This adds a lot of overhead, and decreases r/w throughput. It hardly takes 3us(@48MHz) for 128bit r/w to complete, hence its better to poll on word complete bit to be set in QSPI_SPI_STATUS_REG instead of using interrupts. This increases the throughput by 30% in both read and write case. So, switch to polling mode instead of interrupts to determine completion of word transfer. Signed-off-by: Vignesh R <vigneshr@ti.com> Signed-off-by: Mark Brown <broonie@kernel.org>
2015-10-12spi: ti-qspi: Fix data corruption seen on r/w stress testVignesh R
Writing invalid command to QSPI_SPI_CMD_REG will terminate current transfer and de-assert the chip select. This has to be done before calling spi_finalize_current_message(). Because spi_finalize_current_message() will mark the end of current message transfer and schedule the next transfer. If the chipselect is not de-asserted before calling spi_finalize_current_message() then the next transfer will overlap with the previous transfer leading to data corruption. __spi_pump_message() can be called either from kthread worker context or directly from the calling process's context. It is possible that these two calls can race against each other. But race is serialized by checking whether master->cur_msg == NULL (pointer to msg being handled by transfer_one() at present). The master->cur_msg is set to NULL when spi_finalize_current_message() is called on that message, which means calling spi_finalize_current_message() allows __spi_sync() to pump next message in calling process context. Now if spi-ti-qspi calls spi_finalize_current_message() before we terminate transfer at hardware side, if __spi_pump_message() is called from process context then the successive transactions can overlap. Fix this by moving writing invalid command to QSPI_SPI_CMD_REG to before calling spi_finalize_current_message() call. Cc: stable@vger.kernel.org # v3.12+ Signed-off-by: Vignesh R <vigneshr@ti.com> Signed-off-by: Mark Brown <broonie@kernel.org>
2015-08-20spi: ti-qspi: use 128 bit transfer mode where possibleVignesh R
TI QSPI has four 32 bit data regsiters which can be used to transfer 16 bytes of data at once. The register group QSPI_SPI_DATA_REG_3, QSPI_SPI_DATA_REG_2, QSPI_SPI_DATA_REG_1 and QSPI_SPI_DATA_REG is treated as a single 128-bit word for shifting data in and out. The bit at QSPI_SPI_DATA_REG_3[31] position is the first bit to be shifted out in case of 128 bit transfer mode. Therefore the first byte to be written to flash should be at QSPI_SPI_DATA_REG_3[31-25] position. Instead of writing 1 byte at a time when interacting with spi-nor flash, make use of all the four registers so that 16 bytes can be transferred in one go. This reduces number of register writes and Word Complete interrupts for a given transfer message size, thereby increasing the write performance. Without this patch the raw flash write speed is ~100KB/s, with this patch the write speed increases to ~400 kB/s on DRA74 EVM. Signed-off-by: Vignesh R <vigneshr@ti.com> Signed-off-by: Mark Brown <broonie@kernel.org>
2015-02-21drivers: spi: ti-qspi: wait for busy bit clear before data write/readMugunthan V N
Data corruption is seen while reading/writing large data from/to qspi device because the data register is over written or read before data is ready which is denoted by busy bit in status register. SO adding a busy bit check before writing/reading data to/from qspi device. Signed-off-by: Mugunthan V N <mugunthanvnm@ti.com> Signed-off-by: Mark Brown <broonie@kernel.org>
2015-02-05spi: ti-qspi: cleanup wait_for_completion return handlingNicholas Mc Guire
return type of wait_for_completion_timeout is unsigned long not int, this patch uses the return value of wait_for_completion_timeout in the condition directly rather than assigning it to an incorrect type variable. Signed-off-by: Nicholas Mc Guire <hofrat@osadl.org> Signed-off-by: Mark Brown <broonie@kernel.org>
2014-10-20spi: drop owner assignment from platform_driversWolfram Sang
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>
2014-03-30Merge remote-tracking branches 'spi/topic/sunxi', 'spi/topic/tegra114', ↵Mark Brown
'spi/topic/ti-qspi', 'spi/topic/ti-ssp', 'spi/topic/topcliff-pch', 'spi/topic/txx9', 'spi/topic/xcomm' and 'spi/topic/xfer' into spi-next
2014-03-30Merge remote-tracking branches 'spi/topic/bus-num', 'spi/topic/cleanup', ↵Mark Brown
'spi/topic/clps711x', 'spi/topic/coldfire', 'spi/topic/completion' and 'spi/topic/davinci' into spi-next
2014-03-10spi/ti-qspi: Fix return from mmap pathSourav Poddar
mmap resource requirement is only for memory mapped operations. If the user does not populate mmap resource, dont call return, instead we go on for normal spi mode operations. Signed-off-by: Sourav Poddar <sourav.poddar@ti.com> Signed-off-by: Mark Brown <broonie@linaro.org>
2014-02-16spi: Remove explictly set bus_num and num_chipselect to default settingAxel Lin
The purpose of commit 1e8a52e18cfb "spi: By default setup spi_masters with 1 chipselect and dynamics bus number" is to avoid setting default value for bus_num and num_chipselect in spi master drivers. So let's remove the duplicate code. Signed-off-by: Axel Lin <axel.lin@ingics.com> Acked-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de> Acked-By: David Daney <david.daney@cavium.com> Acked-by: Stephen Warren <swarren@nvidia.com> Signed-off-by: Mark Brown <broonie@linaro.org>
2014-02-07spi: Use SPI_BPW_MASK macro at appropriate placesAxel Lin
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/pxa2xx', 'spi/topic/qspi', ↵Mark Brown
'spi/topic/s3c24xx', 'spi/topic/s3c64xx', 'spi/topic/sh', 'spi/topic/tegra114', 'spi/topic/tegra20-sflash', 'spi/topic/tegra20-slink', 'spi/topic/txx9' and 'spi/topic/xcomm' into spi-linus
2014-01-13spi: ti-qspi: Fixup driver nameAxel Lin
The driver name in current code looks like a compatible string which is not the naming convention for platform drivers. Fix it and also add modalias since this driver can be built as a module. Signed-off-by: Axel Lin <axel.lin@ingics.com> Acked-by: Sourav Poddar <sourav.poddar@ti.com> Signed-off-by: Mark Brown <broonie@linaro.org>
2014-01-13spi: ti-qspi: Simplify qspi_write_msg and qspi_read_msg implementationAxel Lin
Make the unit of wlen to be byte, and simplify the code to avoid duplicate code for different wlen cases. Signed-off-by: Axel Lin <axel.lin@ingics.com> Acked-by: Sourav Poddar <sourav.poddar@ti.com> Signed-off-by: Mark Brown <broonie@linaro.org>
2014-01-07spi: ti-qspi: Fix getting correct address for qspiAxel Lin
Now platform_get_drvdata() returns the address of qspi rather than master. Also drop unneeded spi_unregister_master() call in ti_qspi_remove() because we use devm_spi_register_master() in probe. commit cbcabb7a300b "spi/qspi: Fix qspi remove path" assumes platform_get_drvdata() returns address of master. However, commit 160a061301c7 "spi/qspi: set correct platform drvdata in ti_qspi_probe()" pass qspi to platform_set_drvdata(). Signed-off-by: Axel Lin <axel.lin@ingics.com> Reviewed-by: Sourav Poddar <sourav.poddar@ti.com> Signed-off-by: Mark Brown <broonie@linaro.org>
2013-12-31spi/qspi: Fix runtime resume pathSourav Poddar
Due to the following commit commit 160a061301c7adf54c40696e7ceedc73f6b747dd Author: Wei Yongjun <yongjun_wei@trendmicro.com.cn> Date: Mon Nov 11 14:13:41 2013 +0800 spi/qspi: set correct platform drvdata in ti_qspi_probe() The ti_qspi_remove() use the platform drvdata as a type of struct ti_qspi, we should pass correct platform drvdata to platform_set_drvdata() in ti_qspi_probe(). Signed-off-by: Wei Yongjun <yongjun_wei@trendmicro.com.cn> Signed-off-by: Mark Brown <broonie@linaro.org> platform_set_drvdata was changed in the probe, so we need to correspondingly change deferencing of qspi in runtime resume path. Else, this will lead to a NULL dereference pointer. Based on v3.13-rc3 Signed-off-by: Sourav Poddar <sourav.poddar@ti.com> Signed-off-by: Mark Brown <broonie@linaro.org>
2013-12-19spi/qspi: parse register by name.Sourav Poddar
Modify the qspi driver to parse reg information by name. If "reg names" is not found, then revert back to normal get resource. Signed-off-by: Sourav Poddar <sourav.poddar@ti.com> Signed-off-by: Mark Brown <broonie@linaro.org>
2013-11-24spi/qspi: Fix qspi remove path.Sourav Poddar
There is a bug in qspi removal path, as a result of which qspi cannot be removed when used as a module. The patch solves the bug and qspi can be removed cleanly. The bugs fixed are: -pm_runtime used around register access. - pm_runtime_disable need to be done before removal. - spi_unregister_master need to be called to unregister the spi device. Tested on DRA7 board. Signed-off-by: Sourav Poddar <sourav.poddar@ti.com> Signed-off-by: Mark Brown <broonie@linaro.org>
2013-11-24spi/qspi: cleanup pm_runtime error check.Sourav Poddar
clean up pm_runtime error check in accordance with rest of the check in the driver. Signed-off-by: Sourav Poddar <sourav.poddar@ti.com> Signed-off-by: Mark Brown <broonie@linaro.org>
2013-11-24spi/qspi: set correct platform drvdata in ti_qspi_probe()Wei Yongjun
The ti_qspi_remove() use the platform drvdata as a type of struct ti_qspi, we should pass correct platform drvdata to platform_set_drvdata() in ti_qspi_probe(). Signed-off-by: Wei Yongjun <yongjun_wei@trendmicro.com.cn> Signed-off-by: Mark Brown <broonie@linaro.org>
2013-10-07Merge remote-tracking branch 'spi/topic/devm' into spi-qspiMark Brown
Conflicts: drivers/spi/spi-ti-qspi.c
2013-10-07spi: ti-qspi: one only one interrupt handlerSebastian Andrzej Siewior
The here used irq and threaded irq handler is a complete non-sense. After the status register is read and the source disabled it schedules a thread (the irq thread) to read the status from the variable, invoke complete() and then renable the interrupt. Again: schedule a thread which invokes _only_ complete(). This patch removes this non-sense and we remain with one handler which invokes complete() if needed. The device remove path should now disable the interupts. This has been compile time tested. Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Tested-by: Sourav Poddar <sourav.poddar@ti.com> Signed-off-by: Mark Brown <broonie@linaro.org>
2013-09-26spi/qspi: Add dual/quad read mode bit.Sourav Poddar
Add dual/quad read mode bit flag for the master controller. These check will be used in the spi framework to determine whether the master controller can do dual/quad read respectively. Signed-off-by: Sourav Poddar <sourav.poddar@ti.com> Signed-off-by: Mark Brown <broonie@linaro.org>
2013-09-26spi: ti-qspi: use devm_spi_register_master()Jingoo Han
Use devm_spi_register_master() to make cleanup paths simpler, and remove unnecessary remove(). Signed-off-by: Jingoo Han <jg1.han@samsung.com> Signed-off-by: Mark Brown <broonie@linaro.org>
2013-09-01spi/qspi: fix missing unlock on error in ti_qspi_start_transfer_one()Wei Yongjun
Add the missing unlock before return from function ti_qspi_start_transfer_one() in the error handling case. Signed-off-by: Wei Yongjun <yongjun_wei@trendmicro.com.cn> Signed-off-by: Mark Brown <broonie@linaro.org>
2013-08-27spi/qspi: Add compatible string for am4372.Sourav Poddar
Add a compatible string for am4372. Signed-off-by: Sourav Poddar <sourav.poddar@ti.com> Signed-off-by: Mark Brown <broonie@linaro.org>
2013-08-27spi/qspi: Fix device table entrySourav Poddar
Fix module device table entry. Without this, there will be a build failure while trying to build qspi as a module. Signed-off-by: Sourav Poddar <sourav.poddar@ti.com> Signed-off-by: Mark Brown <broonie@linaro.org>
2013-08-23spi/qspi: Add dual/quad spi read supportSourav Poddar
Support for multiple lines in SPI framework has been picked[1]. [1]: http://comments.gmane.org/gmane.linux.kernel.spi.devel/14420 Hence, adapting ti qspi driver to support multiple data lines for read. Signed-off-by: Sourav Poddar <sourav.poddar@ti.com> Signed-off-by: Mark Brown <broonie@linaro.org>
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