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* i2c: ihs_i2c: Use macro bestpracticesDirk Eibach2015-11-12-10/+14
| | | | | | | Reinhard Pfau complained that macros in ihs_i2c do not follow best practices. Signed-off-by: Dirk Eibach <dirk.eibach@gdsys.cc> Acked-by: Heiko Schocher <hs@denx.de>
* i2c: ihs_i2c: Dual channel supportDirk Eibach2015-11-12-13/+63
| | | | | | | Support two i2c masters per FPGA. Signed-off-by: Dirk Eibach <dirk.eibach@gdsys.cc> Acked-by: Heiko Schocher <hs@denx.de>
* Merge branch 'master' of git://git.denx.de/u-boot-fsl-qoriqTom Rini2015-10-30-2/+2
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| * armv8/fsl_lsch3: Change arch to fsl-layerscapeMingkai Hu2015-10-29-2/+2
| | | | | | | | | | | | | | | | | | | | | | | | | | There are two LS series processors are built on ARMv8 Layersacpe architecture currently, LS2085A and LS1043A. They are based on ARMv8 core although use different chassis, so create fsl-layerscape to refactor the common code for the LS series processors which also paves the way for adding LS1043A platform. Signed-off-by: Mingkai Hu <Mingkai.Hu@freescale.com> Signed-off-by: Hou Zhiqiang <B48286@freescale.com> Signed-off-by: Gong Qianyu <Qianyu.Gong@freescale.com> Reviewed-by: York Sun <yorksun@freescale.com>
* | i2c: Instantiate I2C controllers when selectedMichal Simek2015-10-28-0/+4
|/ | | | | | | | Do not enable both I2C controllers by default. Enable them only when they are selected. Signed-off-by: Michal Simek <michal.simek@xilinx.com> Reviewed-by: Heiko Schocher <hs@denx.de>
* I2C: mxc_i2c: make I2C1 and I2C2 optionalAlbert ARIBAUD \\(3ADEV\\)2015-10-02-0/+6
| | | | | | | | | | | | | | | | | | | The driver assumed that I2C1 and I2C2 were always enabled, and if they were not, then an asynchronous abort was (silently) raised, to be caught much later on in the Linux kernel. Fix this by making I2C1 and I2C2 optional just like I2C3 and I2C4 are. To make the change binary-invariant, declare I2C1 and I2C2 in every include/configs/ file which defines CONFIG_SYS_I2C_MXC. Also, while updating README about CONFIG_SYS_I2C_MXC_I2C1 and CONFIG_SYS_I2C_MXC_I2C2, add missing descriptions for I2C4 speed (CONFIG_SYS_MXC_I2C4_SPEED) and slave (CONFIG_SYS_MXC_I2C4_SLAVE) config options. Signed-off-by: Albert ARIBAUD (3ADEV) <albert.aribaud@3adev.fr>
* arm: Remove unused ST-Ericsson u8500 archStefan Roese2015-09-15-780/+0
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | This arch does not seem to be supported / used at all in the current U-Boot mainline source tree any more. So lets remove the core u8500 code and code that was only referenced by this platform. Please note that this patch also removes these config options: - CONFIG_PL011_SERIAL_RLCR - CONFIG_PL011_SERIAL_FLUSH_ON_INIT As they only seem to be referenced by u8500 based boards. Without any such board in the current code, these config option don't make sense any more. Lets remove them as well. If someone still wants to use this platform, then please send patches to re-enable support by adding at least one board that references this code. Signed-off-by: Stefan Roese <sr@denx.de> Cc: Mathieu Poirier <mathieu.poirier@linaro.org> Cc: John Rigby <john.rigby@linaro.org> Cc: Simon Glass <sjg@chromium.org> Cc: Masahiro Yamada <yamada.masahiro@socionext.com> Cc: Tom Rini <trini@konsulko.com> Cc: Heiko Schocher <hs@denx.de> Cc: Albert Aribaud <albert.u.boot@aribaud.net> Reviewed-by: Masahiro Yamada <yamada.masahiro@socionext.com>
* rockchip: Add I2C driverSimon Glass2015-09-02-0/+401
| | | | | | | Add an I2C driver for the Rockchip RK3288, using driver model. It should work for other Rockchip SoCs also. Signed-off-by: Simon Glass <sjg@chromium.org>
* dm: Use dev_get_addr() where possibleSimon Glass2015-08-31-5/+3
| | | | | | | | | | This is a convenient way for a driver to get the hardware address of a device, when regmap or syscon are not being used. Change existing callers to use it as an example to others. Signed-off-by: Simon Glass <sjg@chromium.org> Reviewed-by: Joe Hershberger <joe.hershberger@ni.com> Acked-by: Stephen Warren <swarren@wwwdotorg.org>
* of: clean up OF_CONTROL ifdef conditionalsMasahiro Yamada2015-08-18-2/+2
| | | | | | | | | | | | | | | | | | | | | | | | | | | | We have flipped CONFIG_SPL_DISABLE_OF_CONTROL. We have cleansing devices, $(SPL_) and CONFIG_IS_ENABLED(), so we are ready to clear away the ugly logic in include/fdtdec.h: #ifdef CONFIG_OF_CONTROL # if defined(CONFIG_SPL_BUILD) && !defined(SPL_OF_CONTROL) # define OF_CONTROL 0 # else # define OF_CONTROL 1 # endif #else # define OF_CONTROL 0 #endif Now CONFIG_IS_ENABLED(OF_CONTROL) is the substitute. It refers to CONFIG_OF_CONTROL for U-boot proper and CONFIG_SPL_OF_CONTROL for SPL. Also, we no longer have to cancel CONFIG_OF_CONTROL in include/config_uncmd_spl.h and scripts/Makefile.spl. Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com> Reviewed-by: Tom Rini <trini@konsulko.com> Reviewed-by: Simon Glass <sjg@chromium.org> Acked-by: Linus Walleij <linus.walleij@linaro.org>
* i2c: lpc32xx: correct sanity check for requested bus speedVladimir Zapolskiy2015-08-18-11/+11
| | | | | | | | | | | | | | | | | | | | | | | | LPC32xx has 3 I2C bus controllers, 2 of them are used as generic ones and their parent clock is HCLK and CLK_HI/CLK_LO registers are 10 bit wide. This means that if HCLK is 104MHz, then minimal configurable I2C clock speed is about 51KHz. Only USB OTG I2C bus controller CLK registers are 8 bit wide, thus in assumption that peripheral clock is 13MHz it allows to set the minimal bus speed about 25.5KHz. Check for negative half clock value is removed since it is always false. The change fixes the following problem for I2C busses 0 and 1: => i2c dev 0 Setting bus to 0 => i2c speed 100000 Setting bus speed to 100000 Hz Failure changing bus speed (-22) Signed-off-by: Vladimir Zapolskiy <vz@mleia.com> Tested-by: Sylvain Lemieux <slemieux@tycoint.com>
* i2c: lpc32xx: add support for OTG I2CSylvain Lemieux2015-08-18-3/+17
| | | | | | | | Updated the LPC32xx I2C driver to support the OTG I2C that is part of the USB module. Signed-off-by: Sylvain Lemieux <slemieux@tycoint.com> Acked-by: Marek Vasut <marex@denx.de>
* i2c: lpc32xx: fix write timeoutSylvain Lemieux2015-08-17-0/+2
| | | | | | Fix a condition that generate watchdog timeout inside "lpc32xx_i2c_write" when parameters alen = 0 and len = 0. Signed-off-by: Sylvain Lemieux <slemieux@tycoint.com>
* i2c: lpc32xx: fix read timeoutSylvain Lemieux2015-08-17-5/+5
| | | | | | Fix a condition that generate watchdog timeout inside "lpc32xx_i2c_read" when parameters alen != 0 and len = 0. Signed-off-by: Sylvain Lemieux <slemieux@tycoint.com>
* i2c: lpc32xx: use api to get hclk instead of fix valueSylvain Lemieux2015-08-17-1/+1
| | | | | | The HCLK is not constant and can take different value; use the api function to get the value of the HCLK for the I2C clock high and low computation. Signed-off-by: Sylvain Lemieux <slemieux@tycoint.com>
* drivers: hierarchize drivers Kconfig menuMasahiro Yamada2015-08-12-0/+8
| | | | | | | | | | | The menuconfig for drivers are getting more and more cluttered and unreadable because too many entries are displayed in a single flat menu. Use hierarchic menu for each category. Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com> Reviewed-by: Simon Glass <sjg@chromium.org> [trini: Update to apply again in a few places, drop USB hunk] Signed-off-by: Tom Rini <trini@konsulko.com>
* cros_ec: Support the LDO access method used by springSimon Glass2015-08-05-0/+91
| | | | | | | | | | | | | | | | | | | | | | | Add a driver to support the special LDO access used by spring. This is a custom method in the cros_ec protocol - it does not use an I2C pass-through. There are two implementation choices: 1. Write a special LDO driver which can talk across the EC. Duplicate all the logic from TPS65090 for retrying when the LDO fails to come up. 2. Write a special I2C bus driver which pretends to be a TPS65090 and transfers reads and writes using the LDO message. Either is distasteful. The latter method is chosen since it results in less code duplication and a fairly simple (30-line) implementation of the core logic. The crosec 'ldo' subcommand could be removed (since i2c md/mw will work instead) but is retained as a convenience. Signed-off-by: Simon Glass <sjg@chromium.org>
* dm: cros_ec: Convert the I2C tunnel code to use driver modelSimon Glass2015-08-05-0/+53
| | | | | | | | | | | | | | | | | | | The Chrome OS EC supports tunnelling through to an I2C bus on the EC. This currently uses a copy of the I2C command code and a special 'crosec' sub-command. With driver model we can define an I2C bus which tunnels through to the EC, and use the normal 'i2c' command to access it. This simplifies the code and removes some duplication. Add an I2C driver which tunnels through to the EC. Adjust the EC code to support binding child devices so that it can be set up. Adjust the existing I2C xfer function to fit driver model better. For now the old code remains to allow things to still work. It will be removed in a later patch once the new flow is fully enabled. Signed-off-by: Simon Glass <sjg@chromium.org>
* exynos: i2c: Tidy up the driver model codeSimon Glass2015-08-05-36/+103
| | | | | | | | | | | | | | | | | | The existing driver model implementation uses the old non-driver-model code to operate, but has become impossibly tangled as a result. The actual algorithm is quite simple. Also the normal-speed and high-speed buses are quite different and it doesn't seem that useful to put them in the same driver. Finally, there is a bug which breaks communication with the Maxim sound codec and may cause problems with other device. Rewrite the driver model code for normal-speed operation so that it is easier to understand, and fix the bug. Add a TODO to split the drivers. Signed-off-by: Simon Glass <sjg@chromium.org> Reviewed-by: Heiko Schocher <hs@denx.de>
* exynos: i2c: Fix code style with ReadWriteByte()Simon Glass2015-08-05-7/+7
| | | | | | | | This function should not use mixed case, and it is simpler to use clrbits_le32() when clearing bits. Fix it. Signed-off-by: Simon Glass <sjg@chromium.org> Acked-by: Heiko Schocher <hs@denx.de>
* i2c: Add a mux for GPIO-based I2C bus arbitrationSimon Glass2015-08-05-0/+157
| | | | | | | | | | | | | | | | | | | | | | | | While I2C supports multi-master buses this is difficult to get right. The implementation on the master side in software is quite complex. Clock-stretching and the arbitrary time that an I2C transaction can take make it difficult to share the bus fairly in the face of high traffic. When one or more masters can be reset independently part-way through a transaction it is hard to know the state of the bus. This driver provides a scheme based on two 'claim' GPIOs, one driven by the AP (Application Processor, meaning the main CPU) and one driven by the EC (Embedded Controller, a small CPU aimed at handling system tasks). With these they can communicate and reliably share the bus. This scheme has minimal overhead and involves very little code. It is used on snow to permit the EC and the AP to share access to the main system PMIC and battery. The scheme can survive reboots by either side without difficulty. This scheme has been tested in the field with millions of devices. Since U-Boot runs on the AP, the terminology used is 'our' claim GPIO, meaning the AP's, and 'their' claim GPIO, meaning the EC's. This terminology is used by the device tree bindings in Linux also. Signed-off-by: Simon Glass <sjg@chromium.org>
* dm: i2c: Add support for multiplexed I2C busesSimon Glass2015-08-05-0/+216
| | | | | | | | | | | | | | | | | Add a new I2C_MUX uclass. Devices in this class can multiplex between several I2C buses, selecting them one at a time for use by the system. The multiplexing mechanism is left to the driver to decide - it may be controlled by GPIOs, for example. The uclass supports only two methods: select() and deselect(). The current mux state is expected to be stored in the mux itself since it is the only thing that knows how to make things work. The mux can record the current state and then avoid switching unless it is necessary. So select() can be skipped if the mux is already in the correct state. Also deselect() can be made a nop if required. Signed-off-by: Simon Glass <sjg@chromium.org>
* dm: i2c: Add a function to transfer messagesSimon Glass2015-08-05-0/+11
| | | | | | | | | | | Sometimes it is useful to be able to transfer a raw I2C message. This happens when the chip address needs to be set manually, or when the data to be sent/received is in another buffer. Add a function to provide access to this. Signed-off-by: Simon Glass <sjg@chromium.org> Acked-by: Heiko Schocher <hs@denx.de>
* dm: i2c: Add a message debug functionSimon Glass2015-08-05-0/+16
| | | | | | | Add a way to dump the contents of an I2C message for debugging purposes. Signed-off-by: Simon Glass <sjg@chromium.org> Acked-by: Heiko Schocher <hs@denx.de>
* Merge branch 'master' of git://www.denx.de/git/u-boot-imxTom Rini2015-08-02-1/+2
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| * Merge branch 'master' of git://git.denx.de/u-bootStefano Babic2015-07-17-1/+1
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| * | i2c: fix vf610 supportAlbert ARIBAUD \(3ADEV\)2015-07-10-1/+2
| | | | | | | | | | | | | | | | | | | | | Add support in mxc_i2c driver, iomux_v3 and vf610 architecture for the four I2C instances available in VF610. Signed-off-by: Albert ARIBAUD (3ADEV) <albert.aribaud@3adev.fr>
* | | i2c: tegra: Build warning fixes for 64-bitThierry Reding2015-07-27-2/+2
| |/ |/| | | | | | | | | | | | | | | Signed-off-by: Thierry Reding <treding@nvidia.com> Signed-off-by: Tom Warren <twarren@nvidia.com> Signed-off-by: Stephen Warren <swarren@nvidia.com> Acked-by: Tom Rini <trini@konsulko.com> Reviewed-by: Simon Glass <sjg@chromium.org> Signed-off-by: Tom Warren <twarren@nvidia.com>
* | exynos: i2c: Correct bug in pinmux selectionSimon Glass2015-07-10-1/+1
|/ | | | | | | | | | | | When driver model is not used the current code does not correctly select the pinmux for the I2C bus. This bug was introduced by this commit: 8dfcbaa dm: i2c: s3c24x0: adjust to dm-i2c api Signed-off-by: Simon Glass <sjg@chromium.org> Acked-by: Heiko Schocher <hs@denx.de> Reviewed-by: Przemyslaw Marczak <p.marczak@samsung.com> Signed-off-by: Minkyu Kang <mk7.kang@samsung.com>
* dm: i2c: Add compatibility functions for dm_i2c_reg_read/write()Simon Glass2015-06-10-0/+21
| | | | | | | | Add the legacy i2c_reg_read/write() functions to the compatibility layer so that they can be used when CONFIG_DM_I2C_COMPAT is defined. Signed-off-by: Simon Glass <sjg@chromium.org> Acked-by: Heiko Schocher <hs@denx.de>
* Merge branch 'master' of git://git.denx.de/u-boot-uniphierTom Rini2015-05-30-11/+7
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| * ARM: UniPhier: update the vendor name of UniPhier in KconfigMasahiro Yamada2015-05-31-3/+3
| | | | | | | | | | | | | | | | | | The business for UniPhier Soc family has been transferred from Panasonic Corporation to Socionext Inc. Update the SoC select menu in Kconfig. Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
| * ARM: UniPhier: replace <asm/io.h> with <linux/io.h>Masahiro Yamada2015-05-31-8/+4
| | | | | | | | | | | | | | In the Linux coding style, it is recommended to include <linux/io.h> rather than <asm/io.h>. Follow this trend. Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
* | cosmetic: change Author/MAINTAINER Name from Petermaier to SchmelzerHannes Schmelzer2015-05-28-1/+1
|/ | | | | | | | | | | Since i've been married, i also have a new surname. Mr. Petermaier moved to Mr. Schmelzer. In this patch i update all files in which my (old) name is present. Signed-off-by: Hannes Schmelzer <hannes.schmelzer@br-automation.com> Signed-off-by: Hannes Schmelzer <oe5hpm@oevsv.at>
* Merge branch 'master' of git://www.denx.de/git/u-boot-imxTom Rini2015-05-26-22/+24
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| * i2c, mxc: rework i2c base address names for different SoCsHeiko Schocher2015-05-26-25/+24
| | | | | | | | | | | | | | rework and unify i2c address names for different SoCs, which use the mxc_i2c driver. Signed-off-by: Heiko Schocher <hs@denx.de>
| * arm, imx6, i2c: add I2C4 for MX6DLHeiko Schocher2015-05-26-0/+3
| | | | | | | | | | | | add I2C4 modul for MX6DL based boards. Signed-off-by: Heiko Schocher <hs@denx.de>
* | Merge git://git.denx.de/u-boot-samsungTom Rini2015-05-18-5/+5
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| * i2c: s3c: Implant support for S3C2440Marek Vasut2015-05-06-5/+5
| | | | | | | | | | | | | | | | | | | | | | | | | | This is a matter of simple additional ifdefery to cater for the different register layout of the S3C2440 chip. Signed-off-by: Marek Vasut <marex@denx.de> Cc: Heiko Schocher <hs@denx.de> Cc: Kyungmin Park <kyungmin.park@samsung.com> Cc: Lukasz Majewski <l.majewski@samsung.com> Cc: Minkyu Kang <mk7.kang@samsung.com> Cc: Vladimir Zapolskiy <vz@mleia.com> Signed-off-by: Minkyu Kang <mk7.kang@samsung.com>
* | sandbox: i2c: search child emul dev and check its uclass idPrzemyslaw Marczak2015-05-14-3/+17
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The function get_emul() in sandbox i2c bus driver, always returns first child as i2c emul device. This may only work for i2c devices with a single child, which is an only i2c emul device. In case when i2c device has more than one child (e.g. PMIC), and one is i2c emul, then the function should search it by check uclass id for each child. This patch add this change to the get_emul(). Signed-off-by: Przemyslaw Marczak <p.marczak@samsung.com> Cc: Simon Glass <sjg@chromium.org> Acked-by: Simon Glass <sjg@chromium.org> Tested on sandbox: Tested-by: Simon Glass <sjg@chromium.org>
* | i2c: mxc: refactor i2c driver and support dmPeng Fan2015-05-14-185/+396
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 1. Introduce a new structure `struct mxc_i2c_bus`, this structure will used for non-DM and DM. 2. Remove `struct mxc_i2c_regs` structure, but use register offset to access registers based on `base` entry of `struct mxc_i2c_bus`. 3. Remove most `#ifdef I2C_QUIRK_REG`. Using driver_data to contain platform flags. A new flag is introduced, I2C_QUIRK_FLAG. 4. Most functions use `struct mxc_i2c_bus` as one of the parameters. Make most functions common to DM and non-DM, try to avoid duplicated code. 5. Support DM, but pinctrl is not included. Pinmux setting is still set by setup_i2c, but we do not need bus_i2c_init for DM. 6. struct i2c_parms and struct sram_data are removed. 7. Remove bus_i2c_read bus_i2c_write prototype in header file. The frist paramter of bus_i2c_init is modified to i2c index. Add new prototype i2c_idle_bus and force_bus_idle. Since bus_i2c_init is not good for DM I2C and pinctrl is missed, we use a weak function for i2c_idle_bus. Board file take the responsibility to implement this function, like this: " int i2c_idle_bus(struct mxc_i2c_bus *i2c_bus) { if (i2c_bus->index == 0) force_bus_idle(i2c_pads_info0); else if (i2c_bus->index == 1) force_bus_idle(i2c_pads_info1); else xxxxxx } " 8. Introduce a weak function, enable_i2c_clk 9. Tested on an i.MX7 platform. Log info: => dm tree Class Probed Name ---------------------------------------- root [ + ] root_driver simple_bus [ ] |-- soc simple_bus [ ] | |-- aips-bus@30000000 simple_bus [ ] | | |-- anatop@30360000 simple_bus [ ] | | `-- snvs@30370000 simple_bus [ ] | |-- aips-bus@30400000 simple_bus [ ] | `-- aips-bus@30800000 i2c [ ] | |-- i2c@30a20000 i2c [ ] | `-- i2c@30a40000 simple_bus [ ] `-- regulators => i2c dev 0 Setting bus to 0 => i2c probe Valid chip addresses: 08 50 => i2c md 8 31 0031: 08 08 08 08 08 08 08 08 08 08 08 08 08 08 08 08 Signed-off-by: Peng Fan <Peng.Fan@freescale.com> Acked-by: Simon Glass <sjg@chromium.org>
* | dm: i2c: Add a function to find out the chip offset lengthSimon Glass2015-05-14-0/+7
| | | | | | | | | | | | | | | | We can currently set this but there is no API function to get it. Add one. Signed-off-by: Simon Glass <sjg@chromium.org> Reviewed-by: Joe Hershberger <joe.hershberger@ni.com> Acked-by: Heiko Schocher<hs@denx.de>
* | dm: i2c-gpio: Remove redundant dm_gpio_set_value() callAxel Lin2015-05-05-6/+7
| | | | | | | | | | | | | | | | | | dm_gpio_set_dir_flags() will also set gpio output value when switching to gpio output. So it's not necessary to call dm_gpio_set_value() after dm_gpio_set_dir_flags() call. Signed-off-by: Axel Lin <axel.lin@ingics.com> Acked-by: Simon Glass <sjg@chromium.org>
* | dm: i2c: Add an explicit test mode to the sandbox I2C driverSimon Glass2015-05-05-11/+23
| | | | | | | | | | | | | | | | | | At present this driver has a few test features. They are needed for running the driver model unit tests but are confusing and unnecessary if using sandbox at the command line. Add a flag to enable the test mode, and don't enable it by default. Signed-off-by: Simon Glass <sjg@chromium.org>
* | dm: i2c: Add functions to read and write a registerSimon Glass2015-05-05-0/+19
| | | | | | | | | | | | | | | | Add driver model versions of the legacy functions to read and write a single byte register. These are a useful shortcut in many cases. Signed-off-by: Simon Glass <sjg@chromium.org> Acked-by: Heiko Schocher <hs@denx.de>
* | dm: i2c: sandbox: Add debugging to the speed limitSimon Glass2015-05-05-1/+3
|/ | | | | | | Print a debug() message with the I2C speed is exceeded. Signed-off-by: Simon Glass <sjg@chromium.org> Acked-by: Heiko Schocher <hs@denx.de>
* driver/i2c/mxc: Enable I2C bus 3 and 4York Sun2015-04-23-3/+14
| | | | | | | | | Some SoCs have more than two I2C busses. Instead of adding ifdef to the driver, macros are put into board header file where CONFIG_SYS_I2C_MXC is defined. Signed-off-by: York Sun <yorksun@freescale.com> CC: Heiko Schocher <hs@denx.de>
* sandbox: Move CONFIG_SYS_I2C_SANDBOX to KconfigSimon Glass2015-04-18-0/+30
| | | | | | | Move this over to Kconfig and tidy up. Signed-off-by: Simon Glass <sjg@chromium.org> Acked-by: Heiko Schocher<hs@denx.de>
* dm: core: Rename driver data function to dev_get_driver_data()Simon Glass2015-04-18-4/+4
| | | | | | | | | The existing get_get_of_data() function provides access to both the driver's compatible string and its driver data. However only the latter is actually useful. Update the interface to reflect this and fix up existing users. Signed-off-by: Simon Glass <sjg@chromium.org> Reviewed-by: Marek Vasut <marex@denx.de>
* dm: i2c: add i2c-gpio driverPrzemyslaw Marczak2015-04-18-0/+356
| | | | | | | | | | | | | | | | | | | | | | | | | | | | This commit adds driver model support to software emulated i2c bus driver. This driver supports kernel-style device tree bindings. Fdt properties in use: - compatible - "i2c-gpio" - gpios - data and clock GPIO pin phandles - delay-us - micro seconds delay between GPIOs toggle operations, which is 1/4 of I2C speed clock period. Added: - Config: CONFIG_DM_I2C_GPIO - File: drivers/i2c/i2c-gpio.c - File: doc/device-tree-bindings/i2c/i2c-gpio.txt Driver base code is taken from: drivers/i2c/soft-i2c.c, changes: - use "i2c-gpio" naming - update comments style - move preprocesor macros into functions - add device tree support - add driver model i2c support - code cleanup, - add Kconfig entry Signed-off-by: Przemyslaw Marczak <p.marczak@samsung.com> Acked-by: Simon Glass <sjg@chromium.org> Added braces in i2c_gpio_xfer() to fix style nit: Signed-off-by: Simon Glass <sjg@chromium.org>
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