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path: root/drivers/i2c/busses
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2013-11-01i2c: exynos5: add High Speed I2C controller driverNaveen Krishna Ch
Adds support for High Speed I2C driver found in Exynos5 and later SoCs from Samsung. Driver only supports Device Tree method. Signed-off-by: Naveen Krishna Chatradhi <ch.naveen@samsung.com> Signed-off-by: Taekgyun Ko <taeggyun.ko@samsung.com> Reviewed-by: Simon Glass <sjg@google.com> Signed-off-by: Yuvaraj Kumar C D <yuvaraj.cd@samsung.com> Signed-off-by: Andrew Bresticker <abrestic@google.com> [wsa: rebased to v3.12-rc4 (no of_i2c.h anymore)] Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
2013-11-01i2c: rcar: fixup rcar type namingKuninori Morimoto
b720423a2627f045133bec39a31fe2bc0dab86f3 (i2c: rcar: add rcar-H2 support) added R-Car H2 support on i2c-rcar. The R-Car I2C type is based on SoC generation (Gen1 = E1/M1/H1, Gen2 = E2/M2/H2), but added naming was H1/H2 instead of Gen1/Gen2. Gen1/Gen2 is better naming on this driver. Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com> Acked-by: Simon Horman <horms+renesas@verge.net.au> Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
2013-11-01i2c: scmi: remove some bogus NULL checksDan Carpenter
"obj" can't be NULL here. We already know that "pkg->package.elements" gives us a valid pointer so the next pointer after that is also non-NULL. Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com> Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
2013-10-31i2c: sh_mobile & rcar: Enable the driver on all ARM platformsLaurent Pinchart
Renesas ARM platforms are transitioning from single-platform to multi-platform kernels using the new ARCH_SHMOBILE_MULTI. Make the driver available on all ARM platforms to enable it on both ARCH_SHMOBILE and ARCH_SHMOBILE_MULTI, and increase build testing coverage with COMPILE_TEST. Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com> Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
2013-10-31i2c: sh_mobile: Convert to clk_prepare/unprepareLaurent Pinchart
Turn clk_enable() and clk_disable() calls into clk_prepare_enable() and clk_disable_unprepare() to get ready for the migration to the common clock framework. Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com> Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
2013-10-30i2c: Include linux/of.h headerSachin Kamat
'of_match_ptr' is defined in linux/of.h. Include it explicitly to avoid build breakage in the future. Signed-off-by: Sachin Kamat <sachin.kamat@linaro.org> Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
2013-10-24of/irq: Use irq_of_parse_and_map()Thierry Reding
Replace some instances of of_irq_map_one()/irq_create_of_mapping() and of_irq_to_resource() by the simpler equivalent irq_of_parse_and_map(). Signed-off-by: Thierry Reding <treding@nvidia.com> Acked-by: Rob Herring <rob.herring@calxeda.com> [grant.likely: resolved conflicts with core code renames] Signed-off-by: Grant Likely <grant.likely@linaro.org>
2013-10-10i2c: omap: Clear ARDY bit twiceTaras Kondratiuk
Initially commit cb527ede1bf6ff2008a025606f25344b8ed7b4ac "i2c-omap: Double clear of ARDY status in IRQ handler" added a workaround for undocumented errata ProDB0017052. But then commit 1d7afc95946487945cc7f5019b41255b72224b70 "i2c: omap: ack IRQ in parts" refactored code and missed one of ARDY clearings. So current code violates errata. It causes often i2c bus timeouts on my Pandaboard. This patch adds a second clearing in place. Signed-off-by: Grygorii Strashko <grygorii.strashko@ti.com> Signed-off-by: Taras Kondratiuk <taras.kondratiuk@linaro.org> Signed-off-by: Wolfram Sang <wsa@the-dreams.de> Cc: stable@kernel.org
2013-10-10i2c: i2c-stu300: replace platform_driver_probe to support deferred probingWolfram Sang
Subsystems like pinctrl and gpio rightfully make use of deferred probing at core level. Now, deferred drivers won't be retried if they don't have a .probe function specified in the driver struct. Fix this driver to have that, so the devices it supports won't get lost in a deferred probe. Acked-by: Linus Walleij <linus.walleij@linaro.org> Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
2013-10-10i2c: i2c-mxs: replace platform_driver_probe to support deferred probingWolfram Sang
Subsystems like pinctrl and gpio rightfully make use of deferred probing at core level. Now, deferred drivers won't be retried if they don't have a .probe function specified in the driver struct. Fix this driver to have that, so the devices it supports won't get lost in a deferred probe. Acked-by: Marek Vasut <marex@denx.de> Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
2013-10-10i2c: i2c-imx: replace platform_driver_probe to support deferred probingWolfram Sang
Subsystems like pinctrl and gpio rightfully make use of deferred probing at core level. Now, deferred drivers won't be retried if they don't have a .probe function specified in the driver struct. Fix this driver to have that, so the devices it supports won't get lost in a deferred probe. Acked-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de> Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
2013-10-10i2c: i2c-designware-platdrv: replace platform_driver_probe to support ↵Wolfram Sang
deferred probing Subsystems like pinctrl and gpio rightfully make use of deferred probing at core level. Now, deferred drivers won't be retried if they don't have a .probe function specified in the driver struct. Fix this driver to have that, so the devices it supports won't get lost in a deferred probe. Reported-by: Zhangfei Gao <zhangfei.gao@linaro.org> Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
2013-10-09drivers: clean-up prom.h implicit includesRob Herring
Powerpc is a mess of implicit includes by prom.h. Add the necessary explicit includes to drivers in preparation of prom.h cleanup. Signed-off-by: Rob Herring <rob.herring@calxeda.com> Acked-by: Grant Likely <grant.likely@linaro.org>
2013-10-06i2c: mxs: Fix PIO mode on i.MX23Marek Vasut
The i.MX23 I2C controller is also capable of PIO, but needs a little harder push to behave. The controller needs to be reset after every PIO/DMA operation for some reason, otherwise in rare cases, the controller can hang or emit bytes onto the bus. Signed-off-by: Marek Vasut <marex@denx.de> Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
2013-10-06i2c: mxs: Rework the PIO mode operationMarek Vasut
Analyze and rework the PIO mode operation. The PIO mode operation was unreliable on MX28, by analyzing the bus with LA, the checks for when data were available or were to be sent were wrong. The PIO WRITE has to be completely reworked as it multiple problems. The MX23 datasheet helped here, see comments in the code for details. The problems boil down to: - RUN bit in CTRL0 must be set after DATA register was written - The PIO transfer must be 4 bytes long tops, otherwise use clock stretching. Both of these fixes are implemented. The PIO READ operation can only be done for up to four bytes as we are unable to read out the data from the DATA register fast enough. This patch also tries to document the investigation within the code. Signed-off-by: Marek Vasut <marex@denx.de> Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
2013-10-06i2c: mxs: distinguish i.MX23 and i.MX28 based I2C controllerJuergen Beisert
It seems the PIO mode does not work, or at least not like it works on a i.MX28. Each short transfer needs about one second (without an error message) but does not send anything on the I2C lines. Signed-off-by: Juergen Beisert <jbe@pengutronix.de> Signed-off-by: Marek Vasut <marex@denx.de> Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
2013-10-03i2c: remove redundant of_match_ptrSachin Kamat
The data structure of_match_ptr() protects is always compiled in. Hence of_match_ptr() is not needed. Signed-off-by: Sachin Kamat <sachin.kamat@linaro.org> Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
2013-09-30i2c: bfin-twi: Remove casting the return value which is a void pointerJingoo Han
Casting the return value which is a 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> Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
2013-09-30i2c: xiic: Remove casting the return value which is a void pointerJingoo Han
Casting the return value which is a 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> Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
2013-09-30i2c: rcar: use per-device clockGuennadi Liakhovetski
Using the same clock for all device instances is non-portable and obtaining clock references by an ID without using a device pointer is discouraged. This is also not needed, because on platforms, where this driver is used, suitable clocks are available for the I2C controllers, that are children of the peripheral clock and just pass its rate 1-to-1 to controllers. This patch switches the driver to obtain references to correct clocks. Signed-off-by: Guennadi Liakhovetski <g.liakhovetski+renesas@gmail.com> Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
2013-09-30i2c: rcar: fix clk_get() error handlingGuennadi Liakhovetski
When clk_get() fails, it returns an error code, not a NULL. This patch fixes such an error handling bug. Signed-off-by: Guennadi Liakhovetski <g.liakhovetski+renesas@gmail.com> Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
2013-09-30i2c: rcar: add Device Tree supportGuennadi Liakhovetski
This patch adds Device Tree support to the i2c-rcar driver and respective documentation. Signed-off-by: Guennadi Liakhovetski <g.liakhovetski+renesas@gmail.com> Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
2013-09-30i2c: rcar: get clock rate only once and simplify calculationGuennadi Liakhovetski
There is no need to repeatedly query clock frequency, where it is not expected to change. The complete loop can also trivially be replaced with a simple division. A further loop below the one, being simplified, could also be replaced, but that would get more complicated. Signed-off-by: Guennadi Liakhovetski <g.liakhovetski+renesas@gmail.com> Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
2013-09-30i2c: rcar: (cosmetic) remove superfluous parenthesisGuennadi Liakhovetski
A recent patch added even more superfluous parenthesis to those, which already were there. Remove them again. Signed-off-by: Guennadi Liakhovetski <g.liakhovetski+renesas@gmail.com> Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
2013-09-28i2c: ismt: initialize DMA bufferJames Ralston
This patch adds code to initialize the DMA buffer to compensate for possible hardware data corruption. Signed-off-by: James Ralston <james.d.ralston@intel.com> [wsa: changed to use 'sizeof'] Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
2013-09-27i2c: designware: 10-bit addressing mode enabling if I2C_DYNAMIC_TAR_UPDATE ↵Chew, Chiau Ee
is set According to Designware I2C spec, if I2C_DYNAMIC_TAR_UPDATE is set to 1, the 10-bit addressing mode is controlled by IC_10BITADDR_MASTER bit of IC_TAR register instead of IC_CON register. The IC_10BITADDR_MASTER in IC_CON register becomes read-only copy. Since I2C_DYNAMIC_TAR_UPDATE value can't be detected from hardware register, so we will always set the IC_10BITADDR_MASTER bit in both IC_CON and IC_TAR register whenever 10-bit addresing mode is requested by user application. Signed-off-by: Chew, Chiau Ee <chiau.ee.chew@intel.com> Reviewed-by: Mika Westerberg <mika.westerberg@linux.intel.com> Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
2013-09-27i2c: mv64xxx: Do not use writel_relaxed()Thierry Reding
The driver is used on PowerPC which don't provide writel_relaxed(). This breaks the c2k and prpmc2800 default configurations. To fix the build, turn the calls to writel_relaxed() into writel(). The impacts for ARM should be minimal. Signed-off-by: Thierry Reding <treding@nvidia.com> Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
2013-09-27i2c: mv64xxx: Fix some build warningsThierry Reding
Some functions and variables are only used if the configuration selects HAVE_CLK. Protect them with a corresponding #ifdef CONFIG_HAVE_CLK block to avoid compiler warnings. Signed-off-by: Thierry Reding <treding@nvidia.com> [wsa: added marker to #endif] Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
2013-09-27i2c: s3c2410: fix clk_disable/clk_unprepare WARNingsKim Phillips
commit d16933b33914a6dff38a4ecbe8edce44a17898e8 "i2c: s3c2410: Move location of clk_prepare_enable() call in probe function" refactored clk_enable and clk_disable calls yet neglected to remove the clk_disable_unprepare call in the module's remove(). It helps remove warnings on an arndale during unbind: echo 12c90000.i2c > /sys/bus/platform/devices/12c90000.i2c/driver/unbind ------------[ cut here ]------------ WARNING: CPU: 0 PID: 2548 at drivers/clk/clk.c:842 clk_disable+0x18/0x24() Modules linked in: CPU: 0 PID: 2548 Comm: bash Not tainted 3.11.0-next-20130916-00003-gf4bddbc #6 [<c0014d48>] (unwind_backtrace+0x0/0xf8) from [<c00117d0>] (show_stack+0x10/0x14) [<c00117d0>] (show_stack+0x10/0x14) from [<c0361be8>] (dump_stack+0x6c/0xac) [<c0361be8>] (dump_stack+0x6c/0xac) from [<c001d864>] (warn_slowpath_common+0x64/0x88) [<c001d864>] (warn_slowpath_common+0x64/0x88) from [<c001d8a4>] (warn_slowpath_null+0x1c/0x24) [<c001d8a4>] (warn_slowpath_null+0x1c/0x24) from [<c02c4a64>] (clk_disable+0x18/0x24) [<c02c4a64>] (clk_disable+0x18/0x24) from [<c028d0b0>] (s3c24xx_i2c_remove+0x28/0x70) [<c028d0b0>] (s3c24xx_i2c_remove+0x28/0x70) from [<c0217a10>] (platform_drv_remove+0x18/0x1c) [<c0217a10>] (platform_drv_remove+0x18/0x1c) from [<c0216358>] (__device_release_driver+0x58/0xb4) [<c0216358>] (__device_release_driver+0x58/0xb4) from [<c02163d0>] (device_release_driver+0x1c/0x28) [<c02163d0>] (device_release_driver+0x1c/0x28) from [<c02153c0>] (unbind_store+0x58/0x90) [<c02153c0>] (unbind_store+0x58/0x90) from [<c0214c90>] (drv_attr_store+0x20/0x2c) [<c0214c90>] (drv_attr_store+0x20/0x2c) from [<c01032c0>] (sysfs_write_file+0x168/0x198) [<c01032c0>] (sysfs_write_file+0x168/0x198) from [<c00ae1c0>] (vfs_write+0xb0/0x194) [<c00ae1c0>] (vfs_write+0xb0/0x194) from [<c00ae594>] (SyS_write+0x3c/0x70) [<c00ae594>] (SyS_write+0x3c/0x70) from [<c000e3e0>] (ret_fast_syscall+0x0/0x30) ---[ end trace 4c9f9403066f57a6 ]--- ------------[ cut here ]------------ WARNING: CPU: 0 PID: 2548 at drivers/clk/clk.c:751 clk_unprepare+0x14/0x1c() Modules linked in: CPU: 0 PID: 2548 Comm: bash Tainted: G W 3.11.0-next-20130916-00003-gf4bddbc #6 [<c0014d48>] (unwind_backtrace+0x0/0xf8) from [<c00117d0>] (show_stack+0x10/0x14) [<c00117d0>] (show_stack+0x10/0x14) from [<c0361be8>] (dump_stack+0x6c/0xac) [<c0361be8>] (dump_stack+0x6c/0xac) from [<c001d864>] (warn_slowpath_common+0x64/0x88) [<c001d864>] (warn_slowpath_common+0x64/0x88) from [<c001d8a4>] (warn_slowpath_null+0x1c/0x24) [<c001d8a4>] (warn_slowpath_null+0x1c/0x24) from [<c02c5834>] (clk_unprepare+0x14/0x1c) [<c02c5834>] (clk_unprepare+0x14/0x1c) from [<c028d0b8>] (s3c24xx_i2c_remove+0x30/0x70) [<c028d0b8>] (s3c24xx_i2c_remove+0x30/0x70) from [<c0217a10>] (platform_drv_remove+0x18/0x1c) [<c0217a10>] (platform_drv_remove+0x18/0x1c) from [<c0216358>] (__device_release_driver+0x58/0xb4) [<c0216358>] (__device_release_driver+0x58/0xb4) from [<c02163d0>] (device_release_driver+0x1c/0x28) [<c02163d0>] (device_release_driver+0x1c/0x28) from [<c02153c0>] (unbind_store+0x58/0x90) [<c02153c0>] (unbind_store+0x58/0x90) from [<c0214c90>] (drv_attr_store+0x20/0x2c) [<c0214c90>] (drv_attr_store+0x20/0x2c) from [<c01032c0>] (sysfs_write_file+0x168/0x198) [<c01032c0>] (sysfs_write_file+0x168/0x198) from [<c00ae1c0>] (vfs_write+0xb0/0x194) [<c00ae1c0>] (vfs_write+0xb0/0x194) from [<c00ae594>] (SyS_write+0x3c/0x70) [<c00ae594>] (SyS_write+0x3c/0x70) from [<c000e3e0>] (ret_fast_syscall+0x0/0x30) ---[ end trace 4c9f9403066f57a7 ]--- Signed-off-by: Kim Phillips <kim.phillips@linaro.org> Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
2013-09-13Remove GENERIC_HARDIRQ config optionMartin Schwidefsky
After the last architecture switched to generic hard irqs the config options HAVE_GENERIC_HARDIRQS & GENERIC_HARDIRQS and the related code for !CONFIG_GENERIC_HARDIRQS can be removed. Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2013-09-10i2c: davinci: Fix bad dev_get_platdata() conversionOlof Johansson
commit 6d4028c644e (i2c: use dev_get_platdata()) did a bad conversion of this one case: drivers/i2c/busses/i2c-davinci.c: In function 'davinci_i2c_probe': drivers/i2c/busses/i2c-davinci.c:665:2: warning: passing argument 1 of 'dev_get_platdata' from incompatible pointer type [enabled by default] Reviewed-by: Jingoo Han <jg1.han@samsung.com> Acked-by: Wolfram Sang <wsa@the-dreams.de> Signed-off-by: Olof Johansson <olof@lixom.net>
2013-09-04i2c: rcar: add rcar-H2 supportNguyen Viet Dung
This patch modify I2C driver of rcar-H1 to usable on both rcar-H1 and rcar-H2. Signed-off-by: Nguyen Viet Dung <nv-dung@jinso.co.jp> Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
2013-08-28i2c: sirf: retry 3 times as sometimes we get random noack and timeoutZhiwu Song
let i2c core retry 3 times as sometimes we get random noack and timeout even when we access an existing i2c client. Signed-off-by: Zhiwu Song <Zhiwu.Song@csr.com> Signed-off-by: Barry Song <Baohua.Song@csr.com> Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
2013-08-28i2c: sirf: support reverse direction of addressZhiwu Song
if users set I2C_M_REV_DIR_ADDR, revert the direction of address. Signed-off-by: Zhiwu Song <Zhiwu.Song@csr.com> Signed-off-by: Rongjun Ying <rongjun.ying@csr.com> Signed-off-by: Barry Song <Baohua.Song@csr.com> Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
2013-08-28i2c: sirf: fix the typo for setting bitrate to less than 100kZhiwu Song
there is a typo before, it makes the final bitrate wrong, this patch fixes it. Signed-off-by: Zhiwu Song <Zhiwu.Song@csr.com> Signed-off-by: Barry Song <Baohua.Song@csr.com> Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
2013-08-28i2c: sirf: we need to wait I2C_RESET status in resumeZhiwu Song
this fixes the issue that we lost to wait the i2c reset finished. Signed-off-by: Zhiwu Song <Zhiwu.Song@csr.com> Signed-off-by: Barry Song <Baohua.Song@csr.com> Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
2013-08-28i2c: sirf: reset i2c controller early after we get a noackZhiwu Song
Due to hardware ANOMALY, we need to reset I2C earlier after we get NOACK while accessing non-existing clients, otherwise we will get errors even we access existing clients later Signed-off-by: Zhiwu Song <Zhiwu.Song@csr.com> Signed-off-by: Barry Song <Baohua.Song@csr.com> Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
2013-08-28i2c: designware: get SDA hold time, HCNT and LCNT configuration from ACPIMika Westerberg
Some Intel LPSS I2C devices make the SDA hold time and *CNT parameters available via SSCN (standard mode) and FMCN (fast mode) ACPI methods. Implement support for this so that we check whether an ACPI method exists and if it does, fill in the SDA hold time and *CNT values to the device private structure for core to use. Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com> Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
2013-08-28i2c: designware: make HCNT/LCNT values configurableMika Westerberg
The DesignWare I2C controller has high count (HCNT) and low count (LCNT) registers for each of the I2C speed modes (standard and fast). These registers are programmed based on the input clock speed in the driver. The current code calculates these values based on the input clock speed and tries hard to meet the I2C bus timing requirements. This could result non-optimal values with regarding to the bus speed. For example on Intel BayTrail we get bus speed of 315.41kHz which is ~20% slower than we would expect (400kHz) in fast mode (even though the timing requirements are met). This patch makes it possible for the platform code to pass more optimal HCNT/LCNT values to the core driver if they are known beforehand. If these are not set we use the calculated and more conservative values. Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com> Acked-by: Shinya Kuribayashi <skuribay@pobox.com> Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
2013-08-28i2c: mpc: cleanup clock API useGerhard Sittig
make the MPC I2C driver get, prepare and enable the gated clock item for register access during probe; disable and unprepare the clock upon remove(), put is done by the devm approach; hold a reference to the clock over the period of use clock lookup is non-fatal in this implementation as not all platforms may provide clock specs in their device tree, but failure to enable a clock when specified is considered fatal Signed-off-by: Gerhard Sittig <gsi@denx.de> Signed-off-by: Anatolij Gustschin <agust@denx.de> Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
2013-08-28i2c: pnx: fix error return code in i2c_pnx_probe()Wei Yongjun
Fix to return a negative error code in the irq get error handling case instead of 0, as done elsewhere in this function. Signed-off-by: Wei Yongjun <yongjun_wei@trendmicro.com.cn> [wsa: fixed wrong exit point, too] Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
2013-08-28i2c: ismt: add error return code in probe()Wolfram Sang
Return error code in the error case, and not success. Acked-by: Neil Horman <nhorman@tuxdriver.com> Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
2013-08-23i2c: move ACPI helpers into the coreMika Westerberg
This follows what has already been done for the DeviceTree helpers. Move the ACPI helpers from drivers/acpi/acpi_i2c.c to the I2C core and update documentation accordingly. This also solves a problem reported by Jerry Snitselaar that we can't build the ACPI I2C helpers as a module. Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com> Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
2013-08-23i2c: move OF helpers into the coreWolfram Sang
I2C of helpers used to live in of_i2c.c but experience (from SPI) shows that it is much cleaner to have this in the core. This also removes a circular dependency between the helpers and the core, and so we can finally register child nodes in the core instead of doing this manually in each driver. So, fix the drivers and documentation, too. Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
2013-08-23i2c: mv64xxx: Fix timing issue on Armada XP (errata FE-8471889)Gregory CLEMENT
All the Armada XP (mv78230, mv78260 and mv78460) have a silicon issue in the I2C controller which violate the i2c repeated start timing. The I2C standard requires a minimum of 4.7us for the repeated start condition whereas the I2C controller of the Armada XP this time is 2.9us. So this patch adds a 5us delay for the start case only if the the compatible i2c-mv78230 is set. Based on the initals patches from Zbigniew Bodek Signed-off-by: Gregory CLEMENT <gregory.clement@free-electrons.com> Signed-off-by: Zbigniew Bodek <zbb@semihalf.com> Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
2013-08-23i2c: mv64xxx: Add I2C Transaction Generator supportGregory CLEMENT
The I2C Transaction Generator offloads CPU from managing I2C transfer step by step. This feature is currently only available on Armada XP, so usage of this mechanism is activated through device tree. Based on the work of Piotr Ziecik and rewrote to use the new way of handling multiples i2c messages. Signed-off-by: Piotr Ziecik <kosmo@semihalf.com> Signed-off-by: Gregory CLEMENT <gregory.clement@free-electrons.com> Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
2013-08-21i2c: powermac: fix return path on errorWolfram Sang
We want to bail out immediately if i2c_add_adapter failed and not try to register child nodes with a nilled adapter structure. Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
2013-08-19i2c: tiny-usb: do not use stack as URB transfer_bufferJussi Kivilinna
Patch fixes i2c-tiny-usb not to use stack as URB transfer_buffer. URB buffers need to be DMA-able, which stack is not. Patch is only compile tested. Signed-off-by: Jussi Kivilinna <jussi.kivilinna@iki.fi> Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
2013-08-19i2c: use dev_get_platdata()Jingoo Han
Use the wrapper function for retrieving the platform data instead of accessing dev->platform_data directly. Signed-off-by: Jingoo Han <jg1.han@samsung.com> Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
2013-08-19i2c: omap: query STP always when NACK is receivedGrygorii Strashko
According to I2C specification the NACK should be handled as folowing: "When SDA remains HIGH during this ninth clock pulse, this is defined as the Not Acknowledge signal. The master can then gene rate either a STOP condition to abort the transfer, or a repeated START condition to start a new transfer." [http://www.nxp.com/documents/user_manual/UM10204.pdf] The same is recomened by TI I2C wiki: http://processors.wiki.ti.com/index.php/I2C_Tips Currently, the OMAP I2C driver interrupts I2C trunsfer in case of NACK, but It queries Stop condition OMAP_I2C_CON_REG.STP=1 only if NACK has been received during the last message transmitting/recieving. This may lead to stuck Bus in "Bus Busy" until I2C IP reset (idle/enable). Hence, fix it by querying Stop condition (STP) always when NACK is received. Signed-off-by: Grygorii Strashko <grygorii.strashko@ti.com> Acked-by: Hein Tibosch <hein_tibosch@yahoo.es> Acked-by: Felipe Balbi <balbi@ti.com> Signed-off-by: Wolfram Sang <wsa@the-dreams.de>