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* dm: i2c: Add a note to I2C drivers which need conversionSimon Glass2016-12-05-0/+42
| | | | | | | | Maintainers need to be notified more directly of the need to convert these drivers. Add a note to the top each affected file. Signed-off-by: Simon Glass <sjg@chromium.org> Acked-by: Heiko Schocher <hs@denx.de>
* samsung: i2c: Split the high-speed I2C code into a new driverSimon Glass2016-12-05-545/+591
| | | | | | | | | Now that driver model is used for I2C on all boards, we can split the high-speed code into its own driver. There is virtually no common code, and this significantly reduces confusion. Signed-off-by: Simon Glass <sjg@chromium.org> Acked-by: Heiko Schocher <hs@denx.de>
* samsung: i2c: Drop old code from I2C driverSimon Glass2016-12-05-583/+2
| | | | | | | Now that all boards use DM_I2C we can drop the old code. Signed-off-by: Simon Glass <sjg@chromium.org> Acked-by: Heiko Schocher <hs@denx.de>
* sunxi: Rename CONFIG_SUNXI to CONFIG_ARCH_SUNXIJagan Teki2016-10-30-3/+3
| | | | | | | | | | | | CONFIG_SUNXI -> CONFIG_ARCH_SUNXI and removed CONFIG_SUNIX from config_whitelist.txt Cc: Simon Glass <sjg@chromium.org> Cc: Ian Campbell <ijc@hellion.org.uk> Cc: Hans de Goede <hdegoede@redhat.com> Signed-off-by: Jagan Teki <jteki@openedev.com> Reviewed-by: Hans de Goede <hdegoede@redhat.com> Signed-off-by: Hans de Goede <hdegoede@redhat.com>
* Merge branch 'master' of git://git.denx.de/u-boot-atmelTom Rini2016-10-28-17/+1
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| * i2c: at91_i2c: Change error return -ENODEV to -EINVALWenyou Yang2016-10-28-1/+1
| | | | | | | | | | | | | | | | Change the error return value -ENODEV from to -EINVAL for more reasonable. Signed-off-by: Wenyou Yang <wenyou.yang@atmel.com> Reviewed-by: Heiko Schocher <hs@denx.de>
| * i2c: at91_i2c: Remove unnecessary clock callingWenyou Yang2016-10-28-16/+0
| | | | | | | | | | | | | | | | Due to the peripheral clock driver improvement, remove the unnecessary clock calling. Signed-off-by: Wenyou Yang <wenyou.yang@atmel.com> Reviewed-by: Heiko Schocher <hs@denx.de>
* | i2c: designware: Avoid overwriting the cmd_data registerMarek Vasut2016-10-24-6/+17
|/ | | | | | | | | | | | | | | | | | Make sure the driver writes the cmd_data register only once per read transfer instead of doing so potentially repeatedly. In case the read transfer didn't finish quickly enough, the loop in the driver code would spin fast enough to write the same value into the cmd_data register again before re-checking whether the transfer completed, which would cause another spurious read transfer on the bus. Signed-off-by: Marek Vasut <marex@denx.de> Cc: Stefan Roese <sr@denx.de> Cc: Alexey Brodkin <abrodkin@synopsys.com> Cc: Heiko Schocher <hs@denx.de> Cc: Dinh Nguyen <dinguyen@opensource.altera.com> Cc: Chin Liang See <clsee@altera.com>
* libfdt: Bring in upstream stringlist functionsSimon Glass2016-10-13-1/+1
| | | | | | | | | | | | | | These have now landed upstream. The naming is different and in one case the function signature has changed. Update the code to match. This applies the following upstream commits by Thierry Reding <treding@nvidia.com> : 604e61e fdt: Add functions to retrieve strings 8702bd1 fdt: Add a function to get the index of a string 2218387 fdt: Add a function to count strings Signed-off-by: Simon Glass <sjg@chromium.org>
* x86: i2c: Fix cast of address to 32-bit valueSimon Glass2016-10-11-3/+3
| | | | | | | | This gives a build warning on 64-bit x86. Fix it. Signed-off-by: Simon Glass <sjg@chromium.org> Acked-by: Heiko Schocher <hs@denx.de> Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
* cros_ec: Honor the google,remote-bus dt propertyMoritz Fischer2016-10-08-1/+23
| | | | | | | | | | | | Boards where ECs that use a I2C port != 0 specify this in the devicetree file via the google,remote-bus property. Previously this was ignored and hardcoded to port 0. Signed-off-by: Moritz Fischer <moritz.fischer@ettus.com> Cc: Simon Glass <sjg@chromium.org> Cc: Heiko Schocher <hs@denx.de> Cc: u-boot@lists.denx.de Acked-by: Simon Glass <sjg@chromium.org>
* i2c: tegra: only use new clock/reset APIsStephen Warren2016-09-27-57/+11
| | | | | | | | | | Now that the standard clock/reset APIs are available for all Tegra SoCs, convert the I2C driver to use them exclusively, and remove any references to the custom Tegra-specific APIs. Cc: Heiko Schocher <hs@denx.de> Signed-off-by: Stephen Warren <swarren@nvidia.com> Signed-off-by: Tom Warren <twarren@nvidia.com>
* i2c: mvtwsi.c: Add support for Marvell Armada 7K/8KStefan Roese2016-09-26-0/+1
| | | | | | | | | | | | | | | By adding the "marvell,mv78230-i2c" compatible property, we can enable this I2C driver to support these new ARM64 chips as well. Signed-off-by: Stefan Roese <sr@denx.de> Cc: Nadav Haklai <nadavh@marvell.com> Cc: Neta Zur Hershkovits <neta@marvell.com> Cc: Kostya Porotchkin <kostap@marvell.com> Cc: Omri Itach <omrii@marvell.com> Cc: Igal Liberman <igall@marvell.com> Cc: Haim Boot <hayim@marvell.com> Cc: Hanna Hawa <hannah@marvell.com> Cc: Heiko Schocher <hs@denx.de>
* i2c: mv_i2c.c: Validate read length in I2C commandjinghua2016-09-26-0/+5
| | | | | | | | | | | | | | | | | The I2C bus will get stuck when reading 0 byte. So we add validation of the read length in i2c_read(). This issue only occurs on read operation. Signed-off-by: jinghua <jinghua@marvell.com> Signed-off-by: Stefan Roese <sr@denx.de> Cc: Nadav Haklai <nadavh@marvell.com> Cc: Kostya Porotchkin <kostap@marvell.com> Cc: Wilson Ding <dingwei@marvell.com> Cc: Victor Gu <xigu@marvell.com> Cc: Hua Jing <jinghua@marvell.com> Cc: Terry Zhou <bjzhou@marvell.com> Cc: Hanna Hawa <hannah@marvell.com> Cc: Haim Boot <hayim@marvell.com> Cc: Heiko Schocher <hs@denx.de>
* i2c: mv_i2c.c: Enable runtime speed selection (standard vs fast mode)Stefan Roese2016-09-26-7/+38
| | | | | | | | | | | | | | | | | This patch adds runtime speed configuration to the mv_i2c driver. Currently standard (max 100kHz) and fast mode (max 400kHz) are supported. Signed-off-by: Stefan Roese <sr@denx.de> Cc: Nadav Haklai <nadavh@marvell.com> Cc: Kostya Porotchkin <kostap@marvell.com> Cc: Wilson Ding <dingwei@marvell.com> Cc: Victor Gu <xigu@marvell.com> Cc: Hua Jing <jinghua@marvell.com> Cc: Terry Zhou <bjzhou@marvell.com> Cc: Hanna Hawa <hannah@marvell.com> Cc: Haim Boot <hayim@marvell.com> Cc: Heiko Schocher <hs@denx.de>
* i2c: mv_i2c.c: Add DM supportStefan Roese2016-09-26-48/+136
| | | | | | | | | | | | | Signed-off-by: Stefan Roese <sr@denx.de> Cc: Nadav Haklai <nadavh@marvell.com> Cc: Kostya Porotchkin <kostap@marvell.com> Cc: Wilson Ding <dingwei@marvell.com> Cc: Victor Gu <xigu@marvell.com> Cc: Hua Jing <jinghua@marvell.com> Cc: Terry Zhou <bjzhou@marvell.com> Cc: Hanna Hawa <hannah@marvell.com> Cc: Haim Boot <hayim@marvell.com> Cc: Heiko Schocher <hs@denx.de>
* i2c: mv_i2c.c: Prepare driver for DM conversionStefan Roese2016-09-26-126/+141
| | | | | | | | | | | | | | | | To prepare for the DM conversion, we add a layer of compatibility functions to be used by both the legacy and the DM functions. Signed-off-by: Stefan Roese <sr@denx.de> Cc: Nadav Haklai <nadavh@marvell.com> Cc: Kostya Porotchkin <kostap@marvell.com> Cc: Wilson Ding <dingwei@marvell.com> Cc: Victor Gu <xigu@marvell.com> Cc: Hua Jing <jinghua@marvell.com> Cc: Terry Zhou <bjzhou@marvell.com> Cc: Hanna Hawa <hannah@marvell.com> Cc: Haim Boot <hayim@marvell.com> Cc: Heiko Schocher <hs@denx.de>
* i2c: mv_i2c.c: Remove CONFIG_HARD_I2CStefan Roese2016-09-26-2/+0
| | | | | | | | | | | | | | | CONFIG_HARD_I2C is not needed, lets remove it. Signed-off-by: Stefan Roese <sr@denx.de> Cc: Nadav Haklai <nadavh@marvell.com> Cc: Kostya Porotchkin <kostap@marvell.com> Cc: Wilson Ding <dingwei@marvell.com> Cc: Victor Gu <xigu@marvell.com> Cc: Hua Jing <jinghua@marvell.com> Cc: Terry Zhou <bjzhou@marvell.com> Cc: Hanna Hawa <hannah@marvell.com> Cc: Haim Boot <hayim@marvell.com> Cc: Heiko Schocher <hs@denx.de>
* i2c: mv_i2c.c: cosmetic: Coding style cleanupsStefan Roese2016-09-26-34/+34
| | | | | | | | | | | | | | | | Some mostly indentation coding style cleanups. Also, move this driver to use debug() for debug output. Signed-off-by: Stefan Roese <sr@denx.de> Cc: Nadav Haklai <nadavh@marvell.com> Cc: Kostya Porotchkin <kostap@marvell.com> Cc: Wilson Ding <dingwei@marvell.com> Cc: Victor Gu <xigu@marvell.com> Cc: Hua Jing <jinghua@marvell.com> Cc: Terry Zhou <bjzhou@marvell.com> Cc: Hanna Hawa <hannah@marvell.com> Cc: Haim Boot <hayim@marvell.com> Cc: Heiko Schocher <hs@denx.de>
* treewide: replace #include <asm/errno.h> with <linux/errno.h>Masahiro Yamada2016-09-23-9/+9
| | | | | | | | | | | Now, arch/${ARCH}/include/asm/errno.h and include/linux/errno.h have the same content. (both just wrap <asm-generic/errno.h>) Replace all include directives for <asm/errno.h> with <linux/errno.h>. Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com> [trini: Fixup include/clk.] Signed-off-by: Tom Rini <trini@konsulko.com>
* i2c: at91_i2c: Fix the wrong include fileWenyou Yang2016-09-13-1/+1
| | | | | | | Since the 'clk_client.h' doesn't exist, it should be 'clk.h'. Signed-off-by: Wenyou Yang <wenyou.yang@atmel.com> Reviewed-by: Simon Glass <sjg@chromium.org>
* rockchip: i2c: fix >32 byte writesJohn Keeping2016-09-13-2/+2
| | | | | | | | | The special handling of the chip address and register address must only happen before we send the data buffer, otherwise we will end up inserting both of these every 32 bytes. Signed-off-by: John Keeping <john@metanate.com> Acked-by: Simon Glass <sjg@chromium.org>
* rockchip: i2c: move register write out of inner loopJohn Keeping2016-09-13-2/+2
| | | | | | | | | | | There is no point in writing intermediate values to the txdata registers. Also add padding to the debug logging to make it easier to read when there are leading zeroes. Signed-off-by: John Keeping <john@metanate.com> Acked-by: Simon Glass <sjg@chromium.org>
* rockchip: i2c: use named constant when appropriateJohn Keeping2016-09-13-1/+1
| | | | | | | Make it clear that we are using the same value in two adjacent lines. Signed-off-by: John Keeping <john@metanate.com> Acked-by: Simon Glass <sjg@chromium.org>
* Merge branch 'master' of git://git.denx.de/u-boot-i2cTom Rini2016-08-26-2/+2
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| * i2c: mvtwsi: Fix order of address bytes (high to low)Stefan Roese2016-08-26-2/+2
| | | | | | | | | | | | | | | | | | | | | | | | | | Patch f8a10ed1 [i2c: mvtwsi: Make address length variable] accidentally inverted the sequence of address bytes sent to the I2C device. This patch corrects this by sending the highest byte first and the lowest byte last again. Tested on theadorable Armada-XP board. Signed-off-by: Stefan Roese <sr@denx.de> Cc: Mario Six <mario.six@gdsys.cc> Cc: Heiko Schocher <hs@denx.de>
* | ARM: tegra: remove stale nvidia, bpmp I2C DT propertyStephen Warren2016-08-25-10/+0
| | | | | | | | | | | | | | | | | | | | The nvidia,bpmp property is left over from an old BPMP I2C binding, and shouldn't be present. Remove it from the SoC DT file, and update the I2C driver not to parse it; the value wasn't used for anything any more anyway. Signed-off-by: Stephen Warren <swarren@nvidia.com> Signed-off-by: Tom Warren <twarren@nvidia.com>
* | ARM: tegra: fix Tegra186 I2C clock nameStephen Warren2016-08-25-1/+1
|/ | | | | | | | The Tegra I2C binding dictates that the clock name for the Tegra I2C clock be "div-clk" not "i2c". Fix the Tegra186 DT and I2C driver to honor this. Signed-off-by: Stephen Warren <swarren@nvidia.com> Signed-off-by: Tom Warren <twarren@nvidia.com>
* i2c: intel_i2c: SMBus driver PCI addition (e.g. BayTrail)Stefan Roese2016-08-16-21/+269
| | | | | | | | | | | | | | | | | | | | | This patch adds support for the SMBus block read/write functionality. Other protocols like the SMBus quick command need to get added if this is needed. This patch also removed the SMBus related defines from the Ivybridge pch.h header. As they are integrated in this driver and should be used from here. This change is added in this patch to avoid compile breakage to keep the source git bisectable. Tested on a congatec BayTrail board to configure the SMSC2513 USB hub. Signed-off-by: Stefan Roese <sr@denx.de> Cc: Bin Meng <bmeng.cn@gmail.com> Cc: Simon Glass <sjg@chromium.org> Cc: Heiko Schocher <hs@denx.de> Cc: George McCollister <george.mccollister@gmail.com> Reviewed-by: Simon Glass <sjg@chromium.org>
* Merge branch 'master' of git://git.denx.de/u-boot-atmelTom Rini2016-08-15-0/+426
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| * i2c: atmel: add i2c driverSongjun Wu2016-08-15-0/+426
| | | | | | | | | | | | | | | | Add i2c driver. Signed-off-by: Songjun Wu <songjun.wu@atmel.com> Reviewed-by: Heiko Schocher <hs@denx.de> Acked-by: Heiko Schocher <hs@denx.de>
* | i2c: tegra: add standardized clk/reset API supportBryan Wu2016-08-15-4/+85
| | | | | | | | | | | | | | | | | | | | | | | | | | clk/reset API was tested on T186 platform and previous chip like T210/T124 will still use the old APIs. Signed-off-by: Bryan Wu <pengw@nvidia.com> (swarren, simplified some ifdefs, removed indent level inside an ifdef) (swarren, added comment about the ifdefs) Signed-off-by: Stephen Warren <swarren@nvidia.com> Reviewed-by: Simon Glass <sjg@chromium.org> Reviewed-by: Heiko Schocher <hs@denx.de> Signed-off-by: Tom Warren <twarren@nvidia.com>
* | i2c: add Tegra186 BPMP driverStephen Warren2016-08-15-0/+140
|/ | | | | | | | | | | On Tegra186, some I2C controllers are directly controlled by the main CPU, whereas others are controlled by the BPMP, and can only be accessed by the main CPU via IPC requests to the BPMP. This driver covers the latter case. Signed-off-by: Stephen Warren <swarren@nvidia.com> Reviewed-by: Simon Glass <sjg@chromium.org> Reviewed-by: Heiko Schocher <hs@denx.de> Signed-off-by: Tom Warren <twarren@nvidia.com>
* Merge git://git.denx.de/u-boot-dmTom Rini2016-08-12-1/+1
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| * fdt: allow fdtdec_get_addr_size_*() to translate addressesStephen Warren2016-08-12-1/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Some code may want to read reg values from DT, but from nodes that aren't associated with DM devices, so using dev_get_addr_index() isn't appropriate. In this case, fdtdec_get_addr_size_*() are the functions to use. However, "translation" (via the chain of ranges properties in parent nodes) may still be desirable. Add a function parameter to request that, and implement it. Update all call sites to default to the original behaviour. Signed-off-by: Stephen Warren <swarren@nvidia.com> Reviewed-by: Simon Glass <sjg@chromium.org> Squashed in build fix from Stephen: Signed-off-by: Simon Glass <sjg@chromium.org>
* | i2c: Drop redundant platform data setting in driversSimon Glass2016-08-12-6/+0
|/ | | | | | | | | The i2c uclass has a default setting for per_child_platdata_auto_alloc_size so drivers do not need to set it. Remove this from drivers to avoid confusion. Signed-off-by: Simon Glass <sjg@chromium.org> Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
* i2c: i2c-uclass-compat: avoid any BSS usageVignesh R2016-08-08-1/+1
| | | | | | | | | | | As I2C can be used before DRAM initialization for reading EEPROM, avoid using static variables stored in BSS, since BSS is in DRAM, which may not have been initialised yet. Explicitly mark "static global" variables as belonging to the .data section. Signed-off-by: Vignesh R <vigneshr@ti.com> Acked-by: Heiko Schocher<hs@denx.de> Reviewed-by: Simon Glass <sjg@chromium.org>
* dm: Use dm_scan_fdt_dev() directly where possibleSimon Glass2016-07-27-11/+3
| | | | | | | Quite a few places have a bind() method which just calls dm_scan_fdt_dev(). We may as well call dm_scan_fdt_dev() directly. Update the code to do this. Signed-off-by: Simon Glass <sjg@chromium.org>
* dm: Convert users from dm_scan_fdt_node() to dm_scan_fdt_dev()Simon Glass2016-07-27-5/+2
| | | | | | | This new function is more convenient for callers, and handles pre-relocation situations automatically. Signed-off-by: Simon Glass <sjg@chromium.org>
* Merge git://git.denx.de/u-boot-fsl-qoriqTom Rini2016-07-26-5/+4
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| * i2c: fsl: Fix driver initializationmario.six@gdsys.cc2016-07-26-5/+4
| | | | | | | | | | | | | | | | | | | | | | | | | | Due to a oversight in testing, the initialization of the recently introduced Freescale I2C DM driver works only for 36 bit mode of e.g. the MPC85XX SoCs (specifically, if the physical addresses are 64 bit wide and the DT addresses 32 bit wide). This patch corrects the initialization so that it will work in a more general setting. Signed-off-by: Mario Six <mario.six@gdsys.cc> Reviewed-by: York Sun <york.sun@nxp.com>
* | i2c: mvtwsi: Add documentationmario.six@gdsys.cc2016-07-26-19/+144
| | | | | | | | | | | | | | Add full documentation to all driver functions. Signed-off-by: Mario Six <mario.six@gdsys.cc> Reviewed-by: Stefan Roese <sr@denx.de>
* | i2c: mvtwsi: Make delay times frequency-dependentmario.six@gdsys.cc2016-07-26-42/+85
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Some devices using the MVTWSI driver have the option to run at speeds faster than Standard Mode (100kHZ). On the Armada 38x controllers, this is actually necessary, since due to erratum FE-8471889, a timing violation concerning repeated starts prevents the controller from working correctly in Standard Mode. One of the workarounds recommended in the erratum is to set the bus to Fast Mode (400kHZ) operation and ensure all connected devices are set to Fast Mode. In the current version of the driver, however, the delay times are hard-coded to 10ms, corresponding to Standard Mode operation. To take full advantage of the faster modes, we would need to either keep the currently configured I2C speed in a globally accessible variable, or pass it to the necessary functions as a parameter. For DM, the first option is not a problem, and we can simply keep the speed in the private data of the driver. For the legacy interface, however, we would need to introduce a static variable, which would cause problems with boots from NOR flashes; see commit d6b7757 "i2c: mvtwsi: Eliminate twsi_control_flags." As to not clutter the interface with yet another parameter, we therefore keep the default 10ms delays for the legacy functions. In DM mode, we make the delay time dependant on the frequency to allow taking full advantage of faster modes of operation (tested with up to 1MHZ frequency on Armada MV88F6820). Signed-off-by: Mario Six <mario.six@gdsys.cc> Reviewed-by: Stefan Roese <sr@denx.de>
* | i2c: mvtwsi: Handle zero-length offsets properlymario.six@gdsys.cc2016-07-26-8/+13
| | | | | | | | | | | | | | | | | | | | | | | | | | Zero-length offsets are not properly handled by the driver. When a read operation with a zero-length offset is started, a START condition is asserted, and since no offset bytes are transferred, a repeated START is issued immediately after, which confuses the controller. To fix this, we send the first START only if any address bytes need to be sent, and keep track of the expected start status accordingly. Signed-off-by: Mario Six <mario.six@gdsys.cc> Reviewed-by: Stefan Roese <sr@denx.de>
* | i2c: mvtwsi: Add compatibility to DMmario.six@gdsys.cc2016-07-26-1/+117
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This patch adds the necessary functions and Kconfig entry to make the MVTWSI I2C driver compatible with the driver model. A possible device tree entry might look like this: i2c@11100 { compatible = "marvell,mv64xxx-i2c"; reg = <0x11000 0x20>; clock-frequency = <100000>; u-boot,i2c-slave-addr = <0x0>; }; Signed-off-by: Mario Six <mario.six@gdsys.cc> Reviewed-by: Stefan Roese <sr@denx.de>
* | i2c: mvtwsi: Make address length variablemario.six@gdsys.cc2016-07-26-9/+21
| | | | | | | | | | | | | | | | | | | | | | | | | | The length of the address parameter of the __twsi_i2c_read and __twsi_i2c_write functions is fixed to four bytes. As a final step in the preparation of the DM conversion, we make the length of this parameter variable by turning it into an array of bytes, and convert the 32 bit value that's passed to the legacy functions into a four-byte-array on the fly. Signed-off-by: Mario Six <mario.six@gdsys.cc> Reviewed-by: Stefan Roese <sr@denx.de>
* | i2c: mvtwsi: Factor out adap parametermario.six@gdsys.cc2016-07-26-51/+46
| | | | | | | | | | | | | | | | | | To be able to use the compatibility layer from the DM functions, we factor the adap parameter out of all functions, and pass the actual register base instead. Signed-off-by: Mario Six <mario.six@gdsys.cc> Reviewed-by: Stefan Roese <sr@denx.de>
* | i2c: mvtwsi: Add compatibility functionsmario.six@gdsys.cc2016-07-26-9/+38
| | | | | | | | | | | | | | | | To prepare for the DM conversion, we add a layer of compatibility functions to be used by both the legacy and the DM functions. Signed-off-by: Mario Six <mario.six@gdsys.cc> Reviewed-by: Stefan Roese <sr@denx.de>
* | i2c: mvtwsi: Use 'uint' instead of 'unsigned int'mario.six@gdsys.cc2016-07-26-5/+5
| | | | | | | | | | | | | | | | | | | | Since some additional parameters will be added in the course of this patch series (especially with the addition of DM support), we replace the longer "unsigned int" declarations with "uint" declarations to keep the parameter lists more readable. Signed-off-by: Mario Six <mario.six@gdsys.cc> Reviewed-by: Stefan Roese <sr@denx.de>
* | i2c: mvtwsi: Get rid of status parametermario.six@gdsys.cc2016-07-26-13/+13
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The twsi_stop function contains a parameter "status," which is used to pass in the current exit status of the function calling twsi_stop, and either return this status unchanged if it indicates an error, or return twsi_stop's exit status if it does not indicate an error. While not massively complicated, this adds another purpose to the twsi_stop function, which should have the sole purpose of asserting a STOP condition on the bus (and not manage the exit status of its caller). Therefore, we move the exit status management into the caller functions by introducing a "stop_status" variable and returning either the status before the twsi_stop call (kept in the "status" variable), or the status from the twsi_stop call, depending on which indicates an error. Signed-off-by: Mario Six <mario.six@gdsys.cc> Reviewed-by: Stefan Roese <sr@denx.de>
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