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path: root/drivers/spi
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2010-12-29spi/m68knommu: Coldfire QSPI platform supportJate Sujjavanich
After grabbing a msg from the msgq, the mcfqspi_work function calls list_del_init on the mcfqspi->msgq which unintentionally deletes the rest of the list before it can be processed. If qspi call was made using spi_sync, this can result in a process hang. Signed-off-by: Jate Sujjavanich <jsujjavanich@syntech-fuelmaster.com> Acked-by: Steven King <sfking@fdwdc.com> Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
2010-12-29spi/omap2_mcspi.c: Force CS to be in inactive state after off-mode transitionGregory CLEMENT
When SPI wake up from OFF mode, CS is in the wrong state: force it to the inactive state. During the system life, I monitored the CS behavior using a oscilloscope. I also activated debug in omap2_mcspi, so I saw when driver disable the clocks and restore context when device is not used.Each time the CS was in the correct state. It was only when system was put suspend to ram with off-mode activated that on resume the CS was in wrong state( ie activated). Changelog: * Change from v1 to v2: - Rebase on linus/master (after 2.6.37-rc1) - Do some clean-up and fix indentation on both patches - Add more explanations for patch 2 * Change from v2 to v3: - Use directly resume function of spi_master instead of using function - from spi_device as Grant Likely pointed it out. - Force this transition explicitly for each CS used by a device. * Change from v3 to v4: - Patch clean-up according to Kevin Hilman and checkpatch. - Now force CS to be in inactive state only if it was inactive when it was suspended. * Change from v4 to v5: - Rebase on linus/master (after 2.6.37-rc3) - Collapse some lines as pointed by Grant Likely - Fix a spelling * Change from v5 to v6: - Rebase on linus/master (after 2.6.37-rc7) - Use CONFIG_SUSPEND instead of CONFIG_PM - Didn't use legacy PM methods anymore. Instead, add a struct dev_pm_ops and add the resume method there. - Fix multi-line comment style * Change from v6 to v7: - Rebase on linus/master (after 2.6.37-rc8) - Drop an extra line Signed-off-by: Gregory CLEMENT <gregory.clement@free-electrons.com> Acked-by: David Brownell <dbrownell@users.sourceforge.net> Reviewed-by: Kevin Hilman <khilman@deeprootsystems.com> Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
2010-12-24Merge branch 'merge' of git://git.secretlab.ca/git/linux-2.6Linus Torvalds
* 'merge' of git://git.secretlab.ca/git/linux-2.6: spi/mpc52xx-spi: fix annotation for remove()-pointer spi/fsl_espi: fix wrong setting of the address in the command buffer spi/fsl_espi: change the read behaviour of the SPIRF of/i2c: Fix request module by alias powerpc/mpc5200: include fs.h in mpc52xx_gpt.c
2010-12-24spi/mpc52xx-spi: fix annotation for remove()-pointerWolfram Sang
Signed-off-by: Wolfram Sang <w.sang@pengutronix.de> Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
2010-12-24spi/fsl_espi: fix wrong setting of the address in the command bufferMingkai Hu
Or else we can't operate on the right address when the trans length is greater than 65535. Signed-off-by: Mingkai Hu <Mingkai.hu@freescale.com> Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
2010-12-24spi/fsl_espi: change the read behaviour of the SPIRFMingkai Hu
The user must read N bytes of SPIRF (1 <= N <= 4) that do not exceed the amount of data in the receive FIFO, so read the SPIRF byte by byte when the data in receive FIFO is less than 4 bytes. On Simics, when read N bytes that exceed the amount of data in receive FIFO, we can't read the data out, that is we can't clear the rx FIFO, then the CPU will loop on the espi rx interrupt. Signed-off-by: Mingkai Hu <Mingkai.hu@freescale.com> Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
2010-12-22drivers/spi/spi.c: don't release the spi device twiceSebastian Andrzej Siewior
This was fixed by David Lamparter in v2.6.36-rc5 3486008 ("spi: free children in spi_unregister_master, not siblings") and broken again in v2.6.37-rc1~2^2~4 during the merge of 2b9603a0 ("spi: enable spi_board_info to be registered after spi_master"). Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Signed-off-by: David Lamparter <equinox@diac24.net> Cc: Grant Likely <grant.likely@secretlab.ca> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2010-12-14dw_spi: Fix missing final read in some polling situationsMajor Lee
There is a possibility that the last word of a transaction will be lost if data is not ready. Re-read in poll_transfer() to solve this issue when poll_mode is enabled. Verified on SPI touch screen device. Signed-off-by: Major Lee <major_lee@wistron.com> Signed-off-by: Alan Cox <alan@linux.intel.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2010-11-30atmel_spi: fix warning In function 'atmel_spi_dma_map_xfer'Jean-Christophe PLAGNIOL-VILLARD
passing argument 2 of 'dma_map_single' discards qualifiers from pointer target type Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com> Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com>
2010-11-01Merge branch 'next-spi' of git://git.secretlab.ca/git/linux-2.6Linus Torvalds
* 'next-spi' of git://git.secretlab.ca/git/linux-2.6: spi/pl022: fix erroneous platform data in U300 spi: fixed odd static string conventions in core code spi/bfin_spi: only request GPIO on first load spi/bfin_spi: handle error/status changes after data interrupts spi: enable spi_board_info to be registered after spi_master
2010-10-25Merge branch 'for-next' of git://android.git.kernel.org/kernel/tegraLinus Torvalds
* 'for-next' of git://android.git.kernel.org/kernel/tegra: spi: tegra: fix error setting on timeout spi: add spi_tegra driver tegra: harmony: enable PCI Express tegra: add PCI Express support tegra: add PCI Express clocks [ARM] tegra: Add APB DMA support [ARM] tegra: Add cpufreq support [ARM] tegra: common: Update common clock init table [ARM] tegra: clock: Add dvfs support, bug fixes, and cleanups [ARM] tegra: Add support for reading fuses [ARM] tegra: gpio: Add suspend and wake support [ARM] tegra: pinmux: add safe values, move tegra2, add suspend [ARM] tegra: add suspend and mirror irqs to legacy controller [ARM] tegra: Add legacy irq support [ARM] tegra: update iomap
2010-10-25spi: tegra: fix error setting on timeoutErik Gilling
avoids derefencing an uninitialized pointer Change-Id: Icf528441ae481e9f6f5ddc0be32c7c217fa49701 Signed-off-by: Erik Gilling <konkers@android.com>
2010-10-22Merge branch 'llseek' of git://git.kernel.org/pub/scm/linux/kernel/git/arnd/bklLinus Torvalds
* 'llseek' of git://git.kernel.org/pub/scm/linux/kernel/git/arnd/bkl: vfs: make no_llseek the default vfs: don't use BKL in default_llseek llseek: automatically add .llseek fop libfs: use generic_file_llseek for simple_attr mac80211: disallow seeks in minstrel debug code lirc: make chardev nonseekable viotape: use noop_llseek raw: use explicit llseek file operations ibmasmfs: use generic_file_llseek spufs: use llseek in all file operations arm/omap: use generic_file_llseek in iommu_debug lkdtm: use generic_file_llseek in debugfs net/wireless: use generic_file_llseek in debugfs drm: use noop_llseek
2010-10-22spi: fixed odd static string conventions in core codeLinus Walleij
This patch removes convention of passing a static string as a parameter to another static string. The convention is intended to reduce text usage by sharing the common bits of the string, but the implementation is inherently fragile (a change to one format string but not the other will nullify any possible advantage), it isn't necessarily a net win depending on what this compiler does, and it it reduces code readability. Signed-off-by: Linus Walleij <linus.walleij@stericsson.com> [grant.likely@secretlab.ca: removed dev_dbg->dev_err hunk] Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
2010-10-22spi/bfin_spi: only request GPIO on first loadMichael Hennerich
The gpiolib code does not allow people to do gpio_request() on a GPIO once it has already been requested. So make sure we only request the pin on the first setup of a SPI device. Otherwise, if you attempts to reconfigure a SPI device on the fly (like change bit sizes), the setup function incorrectly fails. Signed-off-by: Michael Hennerich <michael.hennerich@analog.com> Signed-off-by: Mike Frysinger <vapier@gentoo.org> Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
2010-10-22spi/bfin_spi: handle error/status changes after data interruptsMichael Hennerich
The error interrupt on the BF537 SIC cannot be enabled on a per-peripheral basis. Once the error interrupt is enabled for one peripheral, it is automatically enabled for all. So in the Blackfin on-chip SPI driver, we need to clear out these known errors in the data interrupt once we've successfully finished processing all of the pending data. Signed-off-by: Michael Hennerich <michael.hennerich@analog.com> Signed-off-by: Mike Frysinger <vapier@gentoo.org> Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
2010-10-21spi: enable spi_board_info to be registered after spi_masterFeng Tang
Currently spi_register_board_info() has to be called before its related spi_master be registered, otherwise these board info will be just ignored. This patch will remove this order limit, it adds a global spi master list like the existing global board info listr. Whenever a board info or a spi_master is registered, the spi master list or board info list will be scanned, and a new spi device will be created if there is a master-board info match. Signed-off-by: Feng Tang <feng.tang@intel.com> Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
2010-10-21spi: add spi_tegra driverErik Gilling
v2 changes: from Thierry Reding: * add "select TEGRA_SYSTEM_DMA" to Kconfig from Grant Likely: * add oneline description to header * inline references to DRIVER_NAME * inline references to BUSY_TIMEOUT * open coded bytes_per_word() * spi_readl/writel -> spi_tegra_readl/writel * move transfer validation to spi_tegra_transfer * don't request_mem_region iomem as platform bus does that for us * __exit -> __devexit v3 changes: from Russell King: * put request_mem_region back int from Grant Likely: * remove #undef DEBUG * add SLINK_ to register bit defines * remove unused bytes_per_word * make spi_tegra_readl/writel static linine * various refactoring for clarity * mark err if BSY bit is not cleared after 1000 retries * move spinlock to protect setting of RDY bit * subsys_initcall -> module_init v3 changes: from Grant Likely: * update spi_tegra to use PTR_ERRless dma API v4 changes: from Grant Likely: * remove empty spi_tegra_cleanup fucntion * allow device ids of -1 Signed-off-by: Erik Gilling <konkers@android.com> Acked-by: Grant Likely <grant.likely@secretlab.ca> Cc: Thierry Reding <thierry.reding@avionic-design.de> Cc: Russell King <linux@arm.linux.org.uk> spi: tegra: cleanups from upstream review Change-Id: Icecf7e64efcb39de072a15234ba1faa4bad40d25 Signed-off-by: Erik Gilling <konkers@android.com>
2010-10-21Merge branch 'devel' of master.kernel.org:/home/rmk/linux-2.6-armLinus Torvalds
* 'devel' of master.kernel.org:/home/rmk/linux-2.6-arm: (278 commits) arm: remove machine_desc.io_pg_offst and .phys_io arm: use addruart macro to establish debug mappings arm: return both physical and virtual addresses from addruart arm/debug: consolidate addruart macros for CONFIG_DEBUG_ICEDCC ARM: make struct machine_desc definition coherent with its comment eukrea_mbimxsd-baseboard: Pass the correct GPIO to gpio_free cpuimx27: fix compile when ULPI is selected mach-pcm037_eet: fix compile errors Fixing ethernet driver compilation error for i.MX31 ADS board cpuimx51: update board support mx5: add cpuimx51sd module and its baseboard iomux-mx51: fix GPIO_1_xx 's IOMUX configuration imx-esdhc: update devices registration mx51: add resources for SD/MMC on i.MX51 iomux-mx51: fix SD1 and SD2's iomux configuration clock-mx51: rename CLOCK1 to CLOCK_CCGR for better readability clock-mx51: factorize clk_set_parent and clk_get_rate eukrea_mbimxsd: add support for DVI displays cpuimx25 & cpuimx35: fix OTG port registration in host mode i.MX31 and i.MX35 : fix errate TLSbo65953 and ENGcm09472 ...
2010-10-20spi/omap2_mcspi: Verify TX reg is empty after TX only xfer with DMAIlkka Koskinen
In case of TX only with DMA, the driver assumes that the data has been transferred once DMA callback in invoked. However, SPI's shift register may still contain data. Thus, the driver is supposed to verify that the register is empty and the end of the SPI transfer has been reached. Signed-off-by: Ilkka Koskinen <ilkka.koskinen@nokia.com> Tested-by: Tuomas Katila <ext-tuomas.2.katila@nokia.com> Acked-by: Tony Lindgren <tony@atomide.com> Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
2010-10-20spi/omap2_mcspi: disable channel after TX_ONLY transfer in PIO modeJason Wang
In the TX_ONLY transfer, the SPI controller also receives data simultaneously and saves them in the rx register. After the TX_ONLY transfer, the rx register will hold the random data received during the last tx transaction. If the direct following transfer is RX_ONLY, this random data has the possibility to affect this transfer like this: When the SPI controller is changed from TX_ONLY to RX_ONLY, the random data makes the rx register full immediately and triggers a dummy write automatically(in SPI RX_ONLY transfers, we need a dummy write to trigger the first transaction). So the first data received in the RX_ONLY transfer will be that random data instead of something meaningful. We can avoid this by inserting a Disable/Re-enable toggle of the channel after the TX_ONLY transfer, since it purges the rx register. Signed-off-by: Jason Wang <jason77.wang@gmail.com> Tested-by: Grazvydas Ignotas <notasas@gmail.com> Acked-by: Tony Lindgren <tony@atomide.com> Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
2010-10-18Merge branch 'for-spi' of ↵Grant Likely
git://git.kernel.org/pub/scm/linux/kernel/git/vapier/blackfin into spi/next
2010-10-18spi/bfin_spi: namespace local structsMike Frysinger
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
2010-10-18spi/bfin_spi: init earlyMichael Hennerich
Some systems using this bus sometimes have very basic devices on them such as regulators. So we need to be loaded even earlier in case the devices are used by things such as early board init code. Therefore register in subsys_initcall(). Signed-off-by: Michael Hennerich <michael.hennerich@analog.com> Signed-off-by: Mike Frysinger <vapier@gentoo.org>
2010-10-18spi/bfin_spi: check per-transfer bits_per_wordBob Liu
Currently, if the bits_per_word when doing a transfer is not 8bits, we always treat it as 16bits when we should actually be returning an error. Signed-off-by: Bob Liu <lliubbo@gmail.com> Signed-off-by: Mike Frysinger <vapier@gentoo.org>
2010-10-18spi/bfin_spi: warn when CS is driven by hardware (CPHA=0)Barry Song
When the hardware is controlling the CS, there are some SPI options we are unable to support. So issue a warning in the hopes that the user will change to a SPI mode where we can support things sanely. Signed-off-by: Barry Song <barry.song@analog.com> Signed-off-by: Mike Frysinger <vapier@gentoo.org>
2010-10-18spi/bfin_spi: cs should be always low when a new transfer beginsRob Maris
Signed-off-by: Rob Maris <maris.rob@vdi.de> Signed-off-by: Barry Song <barry.song@analog.com> Signed-off-by: Mike Frysinger <vapier@gentoo.org>
2010-10-18spi/bfin_spi: fix typo in commentRob Maris
Signed-off-by: Rob Maris <maris.rob@vdi.de> Signed-off-by: Barry Song <barry.song@analog.com> Signed-off-by: Mike Frysinger <vapier@gentoo.org>
2010-10-18spi/bfin_spi: reject unsupported SPI modesMike Frysinger
Who knows what people will try! Signed-off-by: Mike Frysinger <vapier@gentoo.org>
2010-10-18spi/bfin_spi: use dma_disable_irq_nosync() in irq handlerBarry Song
Using disable_irq() on the IRQ whose handler we are currently executing in can easily lead to a hang. So use the nosync variant here. Signed-off-by: Barry Song <barry.song@analog.com> Signed-off-by: Mike Frysinger <vapier@gentoo.org>
2010-10-18spi/bfin_spi: combine duplicate SPI_CTL read/write logicMike Frysinger
While combining things, also switch to the proper SPI bit define names. This lets us punt the rarely used SPI defines. Signed-off-by: Mike Frysinger <vapier@gentoo.org>
2010-10-18spi/bfin_spi: reset ctl_reg bits when setup is run again on a deviceMike Frysinger
During runtime, the spi setup function may be called multiple times on the same device in order to reconfigure some settings on the fly. When this happens, we need to reset the ctl_reg bits so that changing the mode works as expected. Reported-by: Andy Getzendanner <james.getzendanner@students.olin.edu> Signed-off-by: Mike Frysinger <vapier@gentoo.org>
2010-10-18spi/bfin_spi: push all size checks into the transfer functionMike Frysinger
This reduces duplication between the setup/transfer functions and keeps values cached during setup from overriding values changed on a transfer basis (like bits_per_word). Signed-off-by: Mike Frysinger <vapier@gentoo.org>
2010-10-18spi/bfin_spi: use nosync when disabling the IRQ from the IRQ handlerYi Li
Using disable_irq() on the IRQ whose handler we are currently executing in can easily lead to a hang. So use the nosync variant here. Signed-off-by: Yi Li <yi.li@analog.com> Signed-off-by: Mike Frysinger <vapier@gentoo.org>
2010-10-18spi/bfin_spi: sync hardware state before reprogramming everythingBarry Song
Sometimes under load, the Blackfin core is able to send SPI register updates out before the controller is actually disabled. So when we go to reprogram the entire state (to switch to a different slave), make sure we sync after disabling the controller. Signed-off-by: Barry Song <barry.song@analog.com> Signed-off-by: Mike Frysinger <vapier@gentoo.org>
2010-10-18spi/bfin_spi: save/restore state when suspending/resumingBarry Song
We can't rely on the SPI_CTL/SPI_FLG registers retaining their state when suspending, so save/restore their entire values. Signed-off-by: Barry Song <barry.song@analog.com> Signed-off-by: Mike Frysinger <vapier@gentoo.org>
2010-10-18spi/bfin_spi: redo GPIO CS handlingBarry Song
The common SPI layers take care of detecting CS conflicts and preventing two devices from claiming the same CS. This causes problems for the GPIO CS support we currently have as we are using CS0 to mean "GPIO CS". But if we have multiple devices using a GPIO CS, the common SPI layers see multiple devices using the virtual "CS0" and reject any such attempts. To make both work, we introduce an offset define. This represents the max number of hardware CS values that the SPI peripheral supports. If the CS is below this limit, we know we can use the hardware CS. If it's above, we treat it as a GPIO CS. This keeps the CS unique as seen by the common code and prevents conflicts. Signed-off-by: Barry Song <barry.song@analog.com> Signed-off-by: Mike Frysinger <vapier@gentoo.org>
2010-10-18spi/bfin_spi: use the SPI namespaced bit namesMike Frysinger
This lets us push the short SPI MMR bit names out of the global namespace. Signed-off-by: Mike Frysinger <vapier@gentoo.org>
2010-10-18spi/bfin_spi: drop extra memory we don't needMike Frysinger
The driver that we based ours on uses a little extra memory behind the normal driver state, but we don't. So drop this useless bit of memory. Reported-by: David Brownell <dbrownell@users.sourceforge.net> Signed-off-by: Mike Frysinger <vapier@gentoo.org>
2010-10-18spi/bfin_spi: convert struct names to something more logicalMike Frysinger
The current structure names are a bit confusing as to what they represent, so use better names. Reported-by: David Brownell <dbrownell@users.sourceforge.net> Signed-off-by: Mike Frysinger <vapier@gentoo.org>
2010-10-18spi/bfin_spi: convert read/write/duplex funcs to a dedicated ops structureMike Frysinger
Rather than having to look up the same 3 sets of functions at the same time, just use an ops structure so we only need to set one pointer. Reported-by: David Brownell <dbrownell@users.sourceforge.net> Signed-off-by: Mike Frysinger <vapier@gentoo.org>
2010-10-18spi/bfin_spi: convert queue run state to true/falseMike Frysinger
No point in creating our own version of true/false defines when there is already a standard stdbool available to us. Reported-by: David Brownell <dbrownell@users.sourceforge.net> Signed-off-by: Mike Frysinger <vapier@gentoo.org>
2010-10-18spi/bfin_spi: fix up some unused/misleading commentsMike Frysinger
Reported-by: David Brownell <dbrownell@users.sourceforge.net> Signed-off-by: Mike Frysinger <vapier@gentoo.org>
2010-10-18spi/bfin_spi: punt useless null read/write funcsMike Frysinger
The chip ops should always be initialized, so having null fallback functions are useless. Reported-by: David Brownell <dbrownell@users.sourceforge.net> Signed-off-by: Mike Frysinger <vapier@gentoo.org>
2010-10-18spi/bfin_spi: drop custom cs_change_per_word supportMike Frysinger
As David points out, the cs_change_per_word option isn't standard, nor is anyone actually using it. So punt all of the dead code considering it makes up ~10% of the code size. Reported-by: David Brownell <dbrownell@users.sourceforge.net> Signed-off-by: Mike Frysinger <vapier@gentoo.org>
2010-10-18spi/bfin_spi: fix CS handlingBarry Song
The CS helper functions were toggling both the Flag Enable and the Flag Value bits, but the Flag Value bit is ignored if the corresponding Flag Enable bit is cleared. So under high speed transactions, the CS sometimes would not toggle properly. Since it makes no sense to toggle the Flag Enable bit dynamically when we actually want to control the Flag Value, do this when setting up the device and then only handle toggling of the CS value during runtime. Signed-off-by: Barry Song <barry.song@analog.com> Signed-off-by: Mike Frysinger <vapier@gentoo.org>
2010-10-18spi/bfin_spi: utilize the SPI interrupt in PIO modeYi Li
The current behavior in PIO mode is to poll the SPI status registers which can obviously lead to higher latencies when doing a lot of SPI traffic. There is a SPI interrupt which can be used instead to signal individual completion of transactions. Signed-off-by: Yi Li <yi.li@analog.com> Signed-off-by: Mike Frysinger <vapier@gentoo.org>
2010-10-18spi/bfin_spi: force sane master-mode state at bootWolfgang Muees
We should make sure the SPI controller is in a sane state in case the boot loader left it in a crappy state. Such as DMA pending which causes interrupts to fire on us. When setting a sane initial state, do not default to slave mode. If we do, then the SPI peripheral may implicitly take over the SPISS pin which other things might be using. For example, the BF533-STAMP uses this pin as a GPIO to control switching between ethernet and flash. If the SPI peripheral controls the output state instead, the ethernet is no longer accessible. URL: http://blackfin.uclinux.org/gf/tracker/5630 Signed-off-by: Wolfgang Muees <wolfgang.mues@auerswald.de> Signed-off-by: Michael Hennerich <michael.hennerich@analog.com> Signed-off-by: Mike Frysinger <vapier@gentoo.org>
2010-10-18spi/bfin_spi: work around anomaly 05000119Sonic Zhang
Anomaly 05000119 states that the DMA_RUN bit with peripherals isn't reliable. However, the way the driver is currently written (DMA IRQ callback), we don't need the polling in the first place, so drop it. Signed-off-by: Sonic Zhang <sonic.zhang@analog.com> Signed-off-by: Mike Frysinger <vapier@gentoo.org>
2010-10-18spi/bfin_spi: fix resources leakageDaniel Mack
Re-order setup() a bit so we don't leak memory/dma/gpio resources upon errors. Also make sure we don't call kfree() twice on the same object. Signed-off-by: Daniel Mack <daniel@caiaq.de> Signed-off-by: Bryan Wu <cooloney@kernel.org> Signed-off-by: Yi Li <yi.li@analog.com> Signed-off-by: Mike Frysinger <vapier@gentoo.org>
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