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* i2c: rcar: bail out on zero length transfersWolfram Sang2014-05-141-1/+8
| | | | | | | | | | This hardware does not support zero length transfers. Instead, the driver does one (random) byte transfers currently with undefined results for the slaves. We now bail out. Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com> Signed-off-by: Wolfram Sang <wsa@the-dreams.de> Cc: stable@kernel.org
* i2c: qup: Fix pm_runtime_get_sync usageAndy Gross2014-05-141-1/+1
| | | | | | | | | This patch corrects the error check on the call to pm_runtime_get_sync. Signed-off-by: Andy Gross <agross@codeaurora.org> Reviewed-by: Ivan T. Ivanov <iivanov@mm-sol.com> Acked-by: Bjorn Andersson <bjorn.andersson@sonymobile.com> Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
* i2c: s3c2410: resume race fixOlof Johansson2014-05-141-1/+1
| | | | | | | | | | | | | | | Don't unmark the device as suspended until after it's been re-setup. The main race would be w.r.t. an i2c driver that gets resumed at the same time (asyncronously), that is allowed to do a transfer since suspended is set to 0 before reinit, but really should have seen the -EIO return instead. Signed-off-by: Olof Johansson <olof@lixom.net> Signed-off-by: Doug Anderson <dianders@chromium.org> Acked-by: Kukjin Kim <kgene.kim@samsung.com> Signed-off-by: Wolfram Sang <wsa@the-dreams.de> Cc: stable@kernel.org
* i2c: nomadik: Don't use IS_ERR for devm_ioremapUlf Hansson2014-05-141-1/+1
| | | | | | | | | devm_ioremap() returns NULL on error, not an error. Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org> Acked-by: Linus Walleij <linus.walleij@linaro.org> Signed-off-by: Wolfram Sang <wsa@the-dreams.de> Cc: stable@kernel.org
* i2c: designware: Mask all interrupts during i2c controller enableDu, Wenkai2014-05-141-0/+3
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | There have been "i2c_designware 80860F41:00: controller timed out" errors on a number of Baytrail platforms. The issue is caused by incorrect value in Interrupt Mask Register (DW_IC_INTR_MASK) when i2c core is being enabled. This causes call to __i2c_dw_enable() to immediately start the transfer which leads to timeout. There are 3 failure modes observed: 1. Failure in S0 to S3 resume path The default value after reset for DW_IC_INTR_MASK is 0x8ff. When we start the first transaction after resuming from system sleep, TX_EMPTY interrupt is already unmasked because of the hardware default. 2. Failure in normal operational path This failure happens rarely and is hard to reproduce. Debug trace showed that DW_IC_INTR_MASK had value of 0x254 when failure occurred, which meant TX_EMPTY was unmasked. 3. Failure in S3 to S0 suspend path This failure also happens rarely and is hard to reproduce. Adding debug trace that read DW_IC_INTR_MASK made this failure not reproducible. But from ISR call trace we could conclude TX_EMPTY was unmasked when problem occurred. The patch masks all interrupts before the controller is enabled to resolve the faulty DW_IC_INTR_MASK conditions. Signed-off-by: Wenkai Du <wenkai.du@intel.com> Acked-by: Mika Westerberg <mika.westerberg@linux.intel.com> [wsa: improved the comment and removed typo in commit msg] Signed-off-by: Wolfram Sang <wsa@the-dreams.de> Cc: stable@kernel.org
* Merge branch 'i2c/for-next' of ↵Linus Torvalds2014-04-0947-345/+2593
|\ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux Pull i2c updates from Wolfram Sang: "Here is the pull request from the i2c subsystem. It got a little delayed because I needed to wait for a dependency to be included (commit b424080a9e08: "reset: Add optional resets and stubs"). Plus, I had some email problems. All done now, the highlights are: - drivers can now deprecate their use of i2c classes. That shouldn't be used on embedded platforms anyhow and was often blindly copy&pasted. This mechanism gives users time to switch away and ultimately boot faster once the use of classes for those drivers is gone for good. - new drivers for QUP, Cadence, efm32 - tracepoint support for I2C and SMBus - bigger cleanups for the mv64xxx, nomadik, and designware drivers And the usual bugfixes, cleanups, feature additions. Most stuff has been in linux-next for a while. Just some hot fixes and new drivers were added a bit more recently." * 'i2c/for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux: (63 commits) i2c: cadence: fix Kconfig dependency i2c: Add driver for Cadence I2C controller i2c: cadence: Document device tree bindings Documentation: i2c: improve section about flags mangling the protocol i2c: qup: use proper type fro clk_freq i2c: qup: off by ones in qup_i2c_probe() i2c: efm32: fix binding doc MAINTAINERS: update I2C web resources i2c: qup: New bus driver for the Qualcomm QUP I2C controller i2c: qup: Add device tree bindings information i2c: i2c-xiic: deprecate class based instantiation i2c: i2c-sirf: deprecate class based instantiation i2c: i2c-mv64xxx: deprecate class based instantiation i2c: i2c-designware-platdrv: deprecate class based instantiation i2c: i2c-davinci: deprecate class based instantiation i2c: i2c-bcm2835: deprecate class based instantiation i2c: mv64xxx: Fix reset controller handling i2c: omap: fix usage of IS_ERR_VALUE with pm_runtime_get_sync i2c: efm32: new bus driver i2c: exynos5: remove unnecessary cast of void pointer ...
| * i2c: cadence: fix Kconfig dependencyWolfram Sang2014-04-061-1/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | During development, the driver first really needed to depend on COMMON_CLK only. Later, it was switched to writel_relaxed, but it was forgotten to update the dependencies, so build errors occured: config: make ARCH=i386 allyesconfig All error/warnings: drivers/i2c/busses/i2c-cadence.c: In function 'cdns_i2c_clear_bus_hold': >> drivers/i2c/busses/i2c-cadence.c:168:3: error: implicit declaration >> of function 'writel_relaxed' [-Werror=implicit-function-declaration] Use a very safe dependency for now. Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
| * i2c: Add driver for Cadence I2C controllerSoren Brinkmann2014-04-063-0/+913
| | | | | | | | | | | | | | | | | | | | Add a driver for the Cadence I2C controller. This controller is for example found in Xilinx Zynq. Signed-off-by: Soren Brinkmann <soren.brinkmann@xilinx.com> Tested-by: Michal Simek <michal.simek@xilinx.com> Reviewed-by: Harini Katakam <harinik@xilinx.com> Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
| * i2c: qup: use proper type fro clk_freqWolfram Sang2014-04-061-1/+1
| | | | | | | | | | | | | | | | It is used with of_property_read_u32(), so it should be u32. Signed-off-by: Wolfram Sang <wsa@the-dreams.de> Acked-by: Bjorn Andersson <bjorn.andersson@sonymobile.com> Fixes: 10c5a8425968 ('i2c: qup: New bus driver for the Qualcomm QUP I2C controller')
| * i2c: qup: off by ones in qup_i2c_probe()Dan Carpenter2014-04-031-2/+2
| | | | | | | | | | | | | | | | These should ">= ARRAY_SIZE()" instead of "> ARRAY_SIZE()". Fixes: 10c5a8425968 ('i2c: qup: New bus driver for the Qualcomm QUP I2C controller') Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com> Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
| * i2c: qup: New bus driver for the Qualcomm QUP I2C controllerBjorn Andersson2014-03-283-0/+779
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This bus driver supports the QUP i2c hardware controller in the Qualcomm SOCs. The Qualcomm Universal Peripheral Engine (QUP) is a general purpose data path engine with input/output FIFOs and an embedded i2c mini-core. The driver supports FIFO mode (for low bandwidth applications) and block mode (interrupt generated for each block-size data transfer). Signed-off-by: Ivan T. Ivanov <iivanov@mm-sol.com> Signed-off-by: Bjorn Andersson <bjorn.andersson@sonymobile.com> Reviewed-by: Andy Gross <agross@codeaurora.org> Tested-by: Philip Elcan <pelcan@codeaurora.org> [wsa: removed needless IS_ERR_VALUE] Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
| * i2c: i2c-xiic: deprecate class based instantiationWolfram Sang2014-03-281-1/+1
| | | | | | | | | | | | | | Warn users that class based instantiation is going away soon in favour of more robust probing and faster bootup times. Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
| * i2c: i2c-sirf: deprecate class based instantiationWolfram Sang2014-03-281-1/+1
| | | | | | | | | | | | | | | | Warn users that class based instantiation is going away soon in favour of more robust probing and faster bootup times. Signed-off-by: Wolfram Sang <wsa@the-dreams.de> Cc: Barry Song <baohua@kernel.org>
| * i2c: i2c-mv64xxx: deprecate class based instantiationWolfram Sang2014-03-281-1/+1
| | | | | | | | | | | | | | Warn users that class based instantiation is going away soon in favour of more robust probing and faster bootup times. Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
| * i2c: i2c-designware-platdrv: deprecate class based instantiationWolfram Sang2014-03-281-1/+1
| | | | | | | | | | | | | | Warn users that class based instantiation is going away soon in favour of more robust probing and faster bootup times. Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
| * i2c: i2c-davinci: deprecate class based instantiationWolfram Sang2014-03-281-1/+1
| | | | | | | | | | | | | | | | | | Warn users that class based instantiation is going away soon in favour of more robust probing and faster bootup times. Signed-off-by: Wolfram Sang <wsa@the-dreams.de> Cc: Sekhar Nori <nsekhar@ti.com> Cc: Kevin Hilman <khilman@deeprootsystems.com>
| * i2c: i2c-bcm2835: deprecate class based instantiationWolfram Sang2014-03-281-1/+1
| | | | | | | | | | | | | | Warn users that class based instantiation is going away soon in favour of more robust probing and faster bootup times. Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
| * i2c: mv64xxx: Fix reset controller handlingMaxime Ripard2014-03-281-3/+3
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The reset framework recently gained optional stubs when CONFIG_RESET_CONTROLLER is not selected. It also introduced a function reset_get_optional, that is also dummy-defined whenever the framework isn't enabled, for drivers that needs an optional reset controller. Switch to this function, since the mv64xxx driver is in this case. This also fixes a compilation breakage whenever the reset framework wasn't selected: drivers/i2c/busses/i2c-mv64xxx.c:771:2: error: implicit declaration of function 'devm_reset_control_get' While we're at it, remove the redundant test on dev.of_node surrounding the calls to reset framework functions, since it will either be a valid pointer, an error pointer in the case where we called reset_get_optional without an of_node pointer or if it failed, or NULL if we're not loaded through DT. Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com> Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
| * i2c: omap: fix usage of IS_ERR_VALUE with pm_runtime_get_syncNishanth Menon2014-03-271-3/+3
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | we use IS_ERR_VALUE to check for error values of pm_runtime_get_sync, when the value can only be < 0 in the case of err. Replace the check with a simpler < 0 check. This fixes the coccicheck warnings: linux-2.6/drivers/i2c/busses/i2c-omap.c:1157:5-24: pm_runtime_get_sync returns < 0 as error. Unecessary IS_ERR_VALUE at line 1158 linux-2.6/drivers/i2c/busses/i2c-omap.c:1278:7-26: pm_runtime_get_sync returns < 0 as error. Unecessary IS_ERR_VALUE at line 1279 drivers/i2c/busses/i2c-omap.c:638:5-24: pm_runtime_get_sync returns < 0 as error. Unecessary IS_ERR_VALUE at line 639 Signed-off-by: Nishanth Menon <nm@ti.com> Reviewed-by: Felipe Balbi <balbi@ti.com> Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
| * i2c: efm32: new bus driverUwe Kleine-König2014-03-273-0/+489
| | | | | | | | | | | | | | | | This was tested on a EFM32GG-DK3750 devboard that has a temperature sensor and an eeprom on its i2c bus. Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de> Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
| * i2c: exynos5: remove unnecessary cast of void pointerJingoo Han2014-03-131-1/+1
| | | | | | | | | | | | | | | | | | | | | | Remove unnecessary cast of void pointer, because 'algo_data' of 'struct i2c_adapter' is a void pointer. Casting the void pointer is redundant. The conversion from void pointer to any other pointer type is guaranteed by the C programming language. Signed-off-by: Jingoo Han <jg1.han@samsung.com> Reviewed-by: Naveen Krishna Chatradhi <ch.naveen@samsung.com> Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
| * i2c: exynos5: add CONFIG_PM_SLEEP to suspend/resume functionsJingoo Han2014-03-131-0/+2
| | | | | | | | | | | | | | | | | | | | | | | | | | Add CONFIG_PM_SLEEP to suspend/resume functions to fix the following build warning when CONFIG_PM_SLEEP is not selected. This is because sleep PM callbacks defined by SIMPLE_DEV_PM_OPS are only used when the CONFIG_PM_SLEEP is enabled. warning: 'exynos5_i2c_suspend_noirq' defined but not used [-Wunused-function] warning: 'exynos5_i2c_resume_noirq' defined but not used [-Wunused-function] Signed-off-by: Jingoo Han <jg1.han@samsung.com> Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
| * i2c: gpio: OF gpio code does not handle defered probe caseBen Dooks2014-03-131-0/+3
| | | | | | | | | | | | | | | | | | | | | | | | | | When using device-tree and the i2c-gpio driver is called before the GPIO node has been probed then it needs to correctly defer the probe instead of returning a permanent error that the gpio numbers are not valid. This fixes the following error: /i2c@2: invalid GPIO pins, sda=-517/scl=-517 Signed-off-by: Ben Dooks <ben.dooks@codethink.co.uk> Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
| * i2c: Add message transfer tracepoints for SMBUS [ver #2]David Howells2014-03-131-3/+20
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The SMBUS tracepoints can be enabled thusly: echo 1 >/sys/kernel/debug/tracing/events/i2c/enable and will dump messages that can be viewed in /sys/kernel/debug/tracing/trace that look like: ... smbus_read: i2c-0 a=051 f=0000 c=fa BYTE_DATA ... smbus_reply: i2c-0 a=051 f=0000 c=fa BYTE_DATA l=1 [39] ... smbus_result: i2c-0 a=051 f=0000 c=fa BYTE_DATA rd res=0 formatted as: i2c-<adapter-nr> a=<addr> f=<flags> c=<command> <protocol-name> <rd|wr> res=<result> l=<data-len> [<data-block>] The adapters to be traced can be selected by something like: echo adapter_nr==1 >/sys/kernel/debug/tracing/events/i2c/filter Note that this shares the same filter and enablement as i2c. Signed-off-by: David Howells <dhowells@redhat.com> Reviewed-by: Steven Rostedt <rostedt@goodmis.org> Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
| * i2c: Add message transfer tracepoints for I2CDavid Howells2014-03-131-0/+37
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Add tracepoints into the I2C message transfer function to retrieve the message sent or received. The following config options must be turned on to make use of the facility: CONFIG_FTRACE CONFIG_ENABLE_DEFAULT_TRACERS The I2C tracepoint can be enabled thusly: echo 1 >/sys/kernel/debug/tracing/events/i2c/enable and will dump messages that can be viewed in /sys/kernel/debug/tracing/trace that look like: ... i2c_write: i2c-5 #0 a=044 f=0000 l=2 [02-14] ... i2c_read: i2c-5 #1 a=044 f=0001 l=4 ... i2c_reply: i2c-5 #1 a=044 f=0001 l=4 [33-00-00-00] ... i2c_result: i2c-5 n=2 ret=2 formatted as: i2c-<adapter-nr> #<message-array-index> a=<addr> f=<flags> l=<datalen> n=<message-array-size> ret=<result> [<data>] The operation is done between the i2c_write/i2c_read lines and the i2c_reply and i2c_result lines so that if the hardware hangs, the trace buffer can be consulted to determine the problematic operation. The adapters to be traced can be selected by something like: echo adapter_nr==1 >/sys/kernel/debug/tracing/events/i2c/filter These changes are based on code from Steven Rostedt. Signed-off-by: Steven Rostedt <rostedt@goodmis.org> Signed-off-by: David Howells <dhowells@redhat.com> Reviewed-by: Steven Rostedt <rostedt@goodmis.org> [wsa: adapted path for 'enable' in the commit msg] Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
| * i2c: remove DEFINE_PCI_DEVICE_TABLE macroJingoo Han2014-03-1320-20/+20
| | | | | | | | | | | | | | | | Don't use DEFINE_PCI_DEVICE_TABLE macro, because this macro is not preferred. Signed-off-by: Jingoo Han <jg1.han@samsung.com> Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
| * i2c: s3c2410: Leave the bus disabled unless it is in useSimon Glass2014-03-121-4/+33
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | There is a rather odd feature of the exynos i2c controller that if it is left enabled, it can lock itself up with the clk line held low. This makes the bus unusable. Unfortunately, the s3c24xx_i2c_set_master() function does not notice this, and reports a timeout. From then on the bus cannot be used until the AP is rebooted. The problem happens when any sort of interrupt occurs (e.g. due to a bus transition) when we are not in the middle of a transaction. We have seen many instances of this when U-Boot leaves the bus apparently happy, but Linux cannot access it. The current code is therefore pretty fragile. This fixes things by leaving the bus disabled unless we are actually in a transaction. We enable the bus at the start of the transaction and disable it at the end. That way we won't get interrupts and will not lock up the bus. It might be possible to clear pending interrupts on start-up, but this seems to be a more robust solution. We can't service interrupts when we are not in a transaction, and anyway would rather not lock up the bus while we try. Signed-off-by: Simon Glass <sjg@chromium.org> Signed-off-by: Naveen Krishna Chatradhi <ch.naveen@samsung.com> Acked-by: Kyungmin Park <kyungmin.park@samsung.com> Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
| * i2c: i2c-s3c2410: deprecate class based instantiationWolfram Sang2014-03-121-1/+1
| | | | | | | | | | | | | | | | | | Warn users that class based instantiation is going away soon in favour of more robust probing and faster bootup times. Signed-off-by: Wolfram Sang <wsa@the-dreams.de> Cc: Ben Dooks <ben-linux@fluff.org> Cc: Kukjin Kim <kgene.kim@samsung.com>
| * i2c: at91: Add device tree property to set clock-frequencyMarek Roszko2014-03-121-2/+8
| | | | | | | | | | | | | | | | | | | | This adds the ability to set "clock-frequency" in the device tree for the at91 i2cbus following the naming of other i2c bus implementations. If the property is not set,the clock frequency will default to the previously used define of 100KHz. Signed-off-by: Marek Roszko <mark.roszko@gmail.com> Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
| * i2c: designware-pci: set ideal HCNT, LCNT and SDA hold time valueChew, Chiau Ee2014-03-121-0/+28
| | | | | | | | | | | | | | | | | | | | | | | | | | On Intel BayTrail, there was case whereby the resulting fast mode bus speed becomes slower (~20% slower compared to expected speed) if using the HCNT/LCNT calculated in the core layer. Thus, this patch is added to allow pci glue layer to pass in optimal HCNT/LCNT/SDA hold time values to core layer since the core layer supports cofigurable HCNT/LCNT/SDA hold time values now. Signed-off-by: Chew, Chiau Ee <chiau.ee.chew@intel.com> Acked-by: Mika Westerberg <mika.westerberg@linux.intel.com> Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
| * i2c: st: Fix return in case of arbitration lostMaxime COQUELIN2014-03-101-1/+1
| | | | | | | | | | | | | | | | | | This patch fixes the error returned to the i2c_transfer function to -EAGAIN in case of arbitratin lost, so that the retry mechanism can be used. Signed-off-by: Maxime Coquelin <maxime.coquelin@st.com> Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
| * i2c: mv64xxx: refactor initialization for new msgsWolfram Sang2014-03-101-10/+6
| | | | | | | | | | | | | | We now have a central place to put this code to. Tested-by: Maxime Ripard <maxime.ripard@free-electrons.com> Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
| * i2c: mv64xxx: directly call send_start when initializing transferWolfram Sang2014-03-101-7/+1
| | | | | | | | | | | | | | | | Calling the state machine with a definite state which is only used in this context is superfluous. Do it directly. Tested-by: Maxime Ripard <maxime.ripard@free-electrons.com> Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
| * i2c: mv64xxx: refactor send_startWolfram Sang2014-03-101-14/+13
| | | | | | | | | | | | | | | | For start and restart, we are doing the same thing. Let's consolidate that. Tested-by: Maxime Ripard <maxime.ripard@free-electrons.com> Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
| * i2c: designware-pci: add 10-bit addressing mode functionality for BYT I2CChew, Chiau Ee2014-03-101-6/+11
| | | | | | | | | | | | | | | | | | All the I2C controllers on Intel BayTrail LPSS subsystem able to support 10-bit addressing mode functionality. Signed-off-by: Chew, Chiau Ee <chiau.ee.chew@intel.com> Signed-off-by: Ong, Boon Leong <boon.leong.ong@intel.com> Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
| * i2c: mxs: Use devm_ioremap_resource()Jingoo Han2014-03-101-12/+6
| | | | | | | | | | | | | | | | | | | | | | Use devm_ioremap_resource() in order to make the code simpler, and remove redundant return value check of platform_get_resource() because the value is checked by devm_ioremap_resource(). Signed-off-by: Jingoo Han <jg1.han@samsung.com> Acked-by: Shawn Guo <shawn.guo@linaro.org> Acked-by: Marek Vasut <marex@denx.de> Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
| * i2c: bcm2835: Use devm_ioremap_resource()Jingoo Han2014-03-091-20/+4
| | | | | | | | | | | | | | | | | | | | Use devm_ioremap_resource() in order to make the code simpler, and remove redundant return value check of platform_get_resource() because the value is checked by devm_ioremap_resource(). Signed-off-by: Jingoo Han <jg1.han@samsung.com> Acked-by: Stephen Warren <swarren@wwwdotorg.org> Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
| * i2c: i801: enable Intel BayTrail SMBUSChew, Kean ho2014-03-092-0/+4
| | | | | | | | | | | | | | | | | | Add Device ID of Intel BayTrail SMBus Controller. Signed-off-by: Chew, Kean ho <kean.ho.chew@intel.com> Signed-off-by: Chew, Chiau Ee <chiau.ee.chew@intel.com> Reviewed-by: Jean Delvare <jdelvare@suse.de> Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
| * i2c: designware-pci: Add Baytrail PCI IDsMika Westerberg2014-03-091-2/+19
| | | | | | | | | | | | | | | | Intel Baytrail I2C controllers can be enumerated from PCI as well as from ACPI. In order to support this add the Baytrail PCI IDs to the driver. Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com> Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
| * i2c: designware-pci: Cleanup driver power managementMika Westerberg2014-03-091-50/+7
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The PCI part of the DesignWare I2C driver does a lot of things that are not required anymore. For example drivers aren't supposed to handle PCI state transitions themselves. This is all provided by the PCI bus core already. In addition to that there is no point scheduling RPM suspend on driver's idle hook but instead we can use RPM autosuspend for this (which is enabled in the driver already). As a bonus, this patch also fixes following compile warning which is emitted when the driver was compiled without CONFIG_PM_RUNTIME set: drivers/i2c/busses/i2c-designware-pcidrv.c:245:12: warning: ‘i2c_dw_pci_runtime_idle’ defined but not used [-Wunused-function] Reported-by: xinhui.pan <xinhuix.pan@intel.com> Reported-by: Jingoo Han <jg1.han@samsung.com> Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com> Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
| * i2c: designware: make SCL and SDA falling time configurableRomain Baeriswyl2014-03-093-11/+25
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This patch allows to set independantly SCL and SDA falling times. The tLOW period is computed by taking into account the SCL falling time. The tHIGH period is computed by taking into account the SDA falling time. For instance in case the margin on tLOW is considered too small, it can be increased by increasing the SCL falling time which is by default set at 300ns. The same applies for tHIGH period with the help of SDA falling time. Signed-off-by: Romain Baeriswyl <romainba@abilis.com> Reviewed-by: Christian Ruppert <christian.ruppert@abilis.com> Acked-by: Shinya Kuribayashi <skuribay@pobox.com> Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
| * i2c: bfin-twi: remove unnecessary Blackfin SSYNC from the driverSonic Zhang2014-03-091-14/+0
| | | | | | | | | | | | | | | | Put necessary SSYNC code into blackfin twi arch header. The generic TWI driver should not contain any architecture specific code. Signed-off-by: Sonic Zhang <sonic.zhang@analog.com> Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
| * i2c: bfin-twi: move bits macros and structs in header from arch include to ↵Sonic Zhang2014-03-091-2/+2
| | | | | | | | | | | | | | | | | | | | | | generic include The ADI TWI peripheral is not binding to the Blackfin processor only. The bits macros and structs should be put in the generic include header. And update head file path in drivers accordingly. Signed-off-by: Sonic Zhang <sonic.zhang@analog.com> Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
| * i2c: mv64xxx: fix circular Kconfig dependencyWolfram Sang2014-03-061-2/+1
| | | | | | | | | | | | | | | | | | | | | | Commit 370136bc67c3 ("i2c: mv64xxx: Add reset deassert call") introduced: drivers/video/Kconfig:42:error: recursive dependency detected! ARCH_SUNXI selects RESET_CONTROLLER anyhow. Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
| * i2c: mv64xxx: Add support for the Allwinner A31 I2C driverMaxime Ripard2014-03-051-0/+11
| | | | | | | | | | | | | | | | | | | | | | The Allwinner A31 I2C controller is almost identical to the one used in the other Allwinner SoCs, except for the fact that it needs to clear the interrupt by setting the INT_FLAGS bit in the control register, instead of clearing it. Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com> Reviewed-by: Gregory CLEMENT <gregory.clement@free-electrons.com> Tested-by: Gregory CLEMENT <gregory.clement@free-electrons.com> Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
| * i2c: mv64xxx: Add reset deassert callMaxime Ripard2014-03-052-2/+20
| | | | | | | | | | | | | | | | | | | | | | | | The Allwinner A31 SoC using that IP has a reset controller maintaining it reset unless told otherwise. Add some optional reset support to the driver. Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com> Reviewed-by: Gregory CLEMENT <gregory.clement@free-electrons.com> Tested-by: Gregory CLEMENT <gregory.clement@free-electrons.com> Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
| * i2c: i2c-rcar: deprecate class based instantiationWolfram Sang2014-03-051-1/+1
| | | | | | | | | | | | | | Warn users that class based instantiation is going away soon in favour of more robust probing and faster bootup times. Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
| * i2c: i2c-tegra: deprecate class based instantiationWolfram Sang2014-03-051-1/+1
| | | | | | | | | | | | | | | | Warn users that class based instantiation is going away soon in favour of more robust probing and faster bootup times. Signed-off-by: Wolfram Sang <wsa@the-dreams.de> Acked-by: Stephen Warren <swarren@nvidia.com>
| * i2c: i2c-stu300: deprecate class based instantiationWolfram Sang2014-03-051-1/+1
| | | | | | | | | | | | | | | | Warn users that class based instantiation is going away soon in favour of more robust probing and faster bootup times. Signed-off-by: Wolfram Sang <wsa@the-dreams.de> Acked-by: Linus Walleij <linus.walleij@linaro.org>
| * i2c: i2c-ocores: deprecate class based instantiationWolfram Sang2014-03-051-1/+1
| | | | | | | | | | | | | | | | Warn users that class based instantiation is going away soon in favour of more robust probing and faster bootup times. Signed-off-by: Wolfram Sang <wsa@the-dreams.de> Acked-by: Peter Korsgaard <jacmet@sunsite.dk>
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