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2020-05-20dt-binding: i2c: add bus-supply propertyBibby Hsieh1-0/+3
In some platforms, they disable the power-supply of i2c due to power consumption reduction. This patch add bus-supply property. Signed-off-by: Bibby Hsieh <bibby.hsieh@mediatek.com> Acked-by: Rob Herring <robh@kernel.org> [wsa: rebased to i2c/for-next] Signed-off-by: Wolfram Sang <wsa@kernel.org>
2020-05-20i2c: reword explanation about atomic transfersWolfram Sang1-3/+3
Atomic transfers are not only about sending messages like the original wording suggested. Speak of 'accessing' now like in i2c.h. Reported-by: Michał Mirosław <mirq-linux@rere.qmqm.pl> Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com> Signed-off-by: Wolfram Sang <wsa@kernel.org>
2020-05-20i2c: slave-eeprom: add support for 24c512 EEPROMsWolfram Sang1-2/+4
I don't plan to support every EEPROM type, but the 24c512 ones need a tiny code update, so let's have that upstream. Reported-by: Patrick Williams <patrick@stwcx.xyz> Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com> Reviewed-by: Patrick Williams <patrick@stwcx.xyz> Signed-off-by: Wolfram Sang <wsa@kernel.org>
2020-05-20i2c: mediatek: Add i2c ac-timing adjust supportQii Wang1-51/+278
This patch adds a algorithm to calculate some ac-timing parameters which can fully meet I2C Spec. Signed-off-by: Qii Wang <qii.wang@mediatek.com> Signed-off-by: Wolfram Sang <wsa@kernel.org>
2020-05-13i2c: designware: Allow slave mode for PCI enumerated devicesAndy Shevchenko2-13/+12
Allow slave mode for PCI enumerated devices by calling a common i2c_dw_probe() instead of i2c_dw_probe_master(). While dropping dependency to platform driver in slave module, move its configuration section above, closer to core. Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Acked-by: Jarkko Nikula <jarkko.nikula@linux.intel.com> Signed-off-by: Wolfram Sang <wsa@kernel.org>
2020-05-13i2c: designware: Rename i2c_dw_probe() to i2c_dw_probe_master()Andy Shevchenko5-10/+20
As a preparatory patch to support slave mode for PCI enumerated devices rename i2c_dw_probe() to i2c_dw_probe_master() and split common i2c_dw_probe() as inline helper. Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Signed-off-by: Wolfram Sang <wsa@kernel.org>
2020-05-13i2c: designware: Switch PCI driver to use i2c_dw_configure_master()Andy Shevchenko1-26/+7
Since we have available helper to configure master mode, let's use it in the PCI driver instead of spread open-coded variant. Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Signed-off-by: Wolfram Sang <wsa@kernel.org>
2020-05-13i2c: designware: Move configuration routines to respective modulesAndy Shevchenko4-37/+48
Move configuration routines to respective modules, i.e. master and slave. Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Signed-off-by: Wolfram Sang <wsa@kernel.org>
2020-05-13i2c: designware: Use devm_platform_ioremap_resource() to simplify codeAndy Shevchenko1-6/+2
Use devm_platform_ioremap_resource() instead of platform_get_resource() + devm_ioremap_resource(). Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Signed-off-by: Wolfram Sang <wsa@kernel.org>
2020-05-12i2c: pxa: use master-abort for device probesRussell King1-8/+2
Use master-abort to send the stop condition after an address cycle rather than resetting the controller. Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk> Signed-off-by: Wolfram Sang <wsa@kernel.org>
2020-05-12i2c: pxa: clear all master action bits in i2c_pxa_stop_message()Russell King1-4/+2
If we timeout during a message transfer, the control register may contain bits that cause an action to be set. Read-modify-writing the register leaving these bits set may trigger the hardware to attempt one of these actions unintentionally. Always clear these bits when cleaning up after a message or after a timeout. Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk> Signed-off-by: Wolfram Sang <wsa@kernel.org>
2020-05-12i2c: pxa: remove some unnecessary debugRussell King1-3/+1
Remove unnecessary show_state() in the loop inside i2c_pxa_pio_set_master(), which can be unnecessarily verbose. Remove the i2c_pxa_scream_blue_murder() in i2c_pxa_pio_xfer(), which will trigger if we are probing the I2C bus and a slave does not respond; this is a normal event, and not something to report. Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk> Signed-off-by: Wolfram Sang <wsa@kernel.org>
2020-05-12i2c: pxa: ensure timeout messages are uniqueRussell King1-3/+3
Ensure that the various timeout messages can identify where in the code they were produced from to aid debugging. Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk> Signed-off-by: Wolfram Sang <wsa@kernel.org>
2020-05-12i2c: pxa: avoid complaints with non-responsive slavesRussell King1-4/+8
Running i2cdetect on a PXA I2C adapter is very noisy; it complains whenever a slave fails to respond to the address cycle. Since it is normal to probe for slaves in this way, we should not fill the kernel log. This is especially true with SFP modules that take a while to respond on the I2C bus, and probing via the I2C bus is the only way to detect that they are ready. Fix this by changing the internal transfer return code from I2C_RETRY to a new NO_SLAVE code (mapped to -ENXIO, as per the I2C documentation for this condition, but we still return -EREMOTEIO to the I2C stack to maintain long established driver behaviour.) Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk> Signed-off-by: Wolfram Sang <wsa@kernel.org>
2020-05-12i2c: pxa: consolidate i2c_pxa_*xfer() implementationsRussell King1-20/+16
Most of i2c_pxa_pio_xfer() and i2c_pxa_xfer() are identical; the only differences are that i2c_pxa_pio_xfer() may reset the bus, and they use different underlying transfer functions. The retry loop is the same. Consolidate these two functions. Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk> Signed-off-by: Wolfram Sang <wsa@kernel.org>
2020-05-11i2c: mux: pca954x: Convert license to SPDX identifierAndy Shevchenko1-5/+2
Use a shorter SPDX identifier instead of pasting the whole license. While here, replace duplicating PCA954x with PCA984x. Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Reviewed-by: Peter Rosin <peda@axentia.se> Signed-off-by: Wolfram Sang <wsa@kernel.org>
2020-05-11i2c: mux: pca954x: Move device_remove_file() out of pca954x_cleanup()Andy Shevchenko1-3/+2
device_create_file() is called the last in ->probe() but pca954x_cleanup(), which is called earlier in error path, tries to remove never created file. Move device_remove_file() call outside of pca954x_cleanup() to make it slightly closer to what pca954x_init() is doing. Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Reviewed-by: Peter Rosin <peda@axentia.se> Signed-off-by: Wolfram Sang <wsa@kernel.org>
2020-05-11i2c: mux: pca954x: Make use of device propertiesAndy Shevchenko1-10/+5
Device property API allows to gather device resources from different sources, such as ACPI. Convert the drivers to unleash the power of device property API. Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Reviewed-by: Peter Rosin <peda@axentia.se> Signed-off-by: Wolfram Sang <wsa@kernel.org>
2020-05-11i2c: mux: pca954x: Refactor pca954x_irq_handler()Andy Shevchenko1-10/+7
Refactor pca954x_irq_handler() to: - use for_each_set_bit() macro - use IRQ_RETVAL() macro Above change makes code easy to read and understand. Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Reviewed-by: Peter Rosin <peda@axentia.se> Signed-off-by: Wolfram Sang <wsa@kernel.org>
2020-05-05i2c: at91: Send bus clear command if SDA is downCodrin Ciubotariu3-8/+50
After a transfer timeout, some faulty I2C slave devices might hold down the SDA pin. We can generate a bus clear command, hoping that the slave might release the pins. If the CLEAR command is not supported, we will use gpio recovery, if available, to reset the bus. Signed-off-by: Codrin Ciubotariu <codrin.ciubotariu@microchip.com> Acked-by: Ludovic Desroches <ludovic.desroches@microchip.com> Signed-off-by: Wolfram Sang <wsa@kernel.org>
2020-05-05i2c: pxa: fix i2c_pxa_wait_bus_not_busy() boundary conditionRussell King1-5/+12
Fix i2c_pxa_wait_bus_not_busy()'s boundary conditions, so that a coincidental success and timeout results in the function returning success. Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk> Signed-off-by: Wolfram Sang <wsa@kernel.org>
2020-05-05i2c: pxa: clean up decode_bits()Russell King1-4/+3
Clean up decode_bits() to use pr_cont(), and move the newline into the function rather than at its two callsites. Avoid printing an unnecessary space before the newline. Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk> Signed-off-by: Wolfram Sang <wsa@kernel.org>
2020-05-05i2c: pxa: fix i2c_pxa_scream_blue_murder() debug outputRussell King1-4/+3
The IRQ log output is supposed to appear on a single line. However, commit 3a2dc1677b60 ("i2c: pxa: Update debug function to dump more info on error") resulted in it being printed one-entry-per-line, which is excessively long. Fixing this is not a trivial matter; using pr_cont() doesn't work as the previous dev_dbg() may not have been compiled in, or may be dynamic. Since the rest of this function output is at error level, and is also debug output, promote this to error level as well to avoid this problem. Reduce the number of always zero prefix digits to save screen real- estate. Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk> Signed-off-by: Wolfram Sang <wsa@kernel.org>
2020-05-05i2c: pxa: move DT IDs along side platform IDsRussell King1-9/+9
Move the ID tables into one place, near the device dependent data. Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk> Signed-off-by: Wolfram Sang <wsa@kernel.org>
2020-05-05i2c: pxa: move private definitions to i2c-pxa.cRussell King2-48/+43
Move driver-private definitions out of the i2c-pxa.h platform data header file into the driver itself. Nothing outside of the driver makes use of these constants. Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk> Signed-off-by: Wolfram Sang <wsa@kernel.org>
2020-05-05i2c: pxa: always set fm and hs members for each typeRussell King1-2/+10
Always set the fm and hs members of struct pxa_reg_layout. These members are already taking space, we don't need code as well. Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk> Signed-off-by: Wolfram Sang <wsa@kernel.org>
2020-05-05i2c: pxa: add and use definitions for IBMR registerRussell King1-4/+8
Add definitions for the bits in the IBMR register, and use them in the code. This improves readability. Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk> Signed-off-by: Wolfram Sang <wsa@kernel.org>
2020-05-05i2c: pxa: re-arrange register field definitionsRussell King1-60/+53
Arrange the register field definitions to be grouped together, rather than the Armada-3700 definitions being separated from the rest of the definitions. Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk> Signed-off-by: Wolfram Sang <wsa@kernel.org>
2020-05-05i2c: pxa: re-arrange functions to flow betterRussell King1-163/+162
Re-arrange the PXA I2C code to avoid forward declarations, and keep similar functionality (e.g. the non-IRQ mode support) together. This improves code readability. Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk> Signed-off-by: Wolfram Sang <wsa@kernel.org>
2020-05-05i2c: pxa: re-arrange includes to be in alphabetical orderRussell King1-8/+8
Arrange the includes to be in alphabetical order to help avoid duplicated includes. Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk> Signed-off-by: Wolfram Sang <wsa@kernel.org>
2020-05-05i2c: pxa: remove unneeded includesRussell King1-4/+0
i2c-pxa does not need linux/sched.h nor linux/time.h includes, so remove these. Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk> Signed-off-by: Wolfram Sang <wsa@kernel.org>
2020-05-05i2c: pxa: use official address byte helperRussell King1-14/+4
i2c-pxa was created before i2c_8bit_addr_from_msg() was implemented, and used its own i2c_pxa_addr_byte() which is functionally the same. Sadly, it was never updated to use this new helper. Switch it over. Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk> Signed-off-by: Wolfram Sang <wsa@kernel.org>
2020-04-30i2c: powermac: use true,false for bool variableJason Yan1-1/+1
In i2c_powermac_register_devices(), variable 'found_onyx' is bool and assigned '0' and 'true' in different places. Use 'false' instead of '0'. Signed-off-by: Jason Yan <yanaijie@huawei.com> Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
2020-04-30i2c: stm32f7: prevent array underflow in stm32f7_get_lower_rate()Dan Carpenter1-1/+1
We want to break with "i" set to zero whether we find the rate we want or not. In the current code, if we don't find the rate we want then it exits the loop with "i" set to -1 and results in an array underflow. Fixes: 09cc9a3bce91 ("i2c: stm32f7: allows for any bus frequency") Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com> Reviewed-by: Alain Volmat <alain.volmat@st.com> Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
2020-04-26platform/mellanox: mlxreg-hotplug: convert to use i2c_new_client_device()Wolfram Sang1-4/+7
Move away from the deprecated API and return the shiny new ERRPTR where useful. Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com> Acked-by: Andy Shevchenko <andy.shevchenko@gmail.com> Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
2020-04-26i2c: iproc: add support for SMBUS quick cmdRayagonda Kokatanur1-3/+7
Add support for SMBUS quick command. SMBUS quick command passes single bit of information to the slave (target) device. Can be used to turn slave device on or off. By default i2c_detect tool uses the smbus quick cmd to try and detect devices. Without this support it will not detect some slaves. Signed-off-by: Rayagonda Kokatanur <rayagonda.kokatanur@broadcom.com> Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
2020-04-26i2c: powermac: Simplify reading the "reg" and "i2c-address" propertyAishwarya R1-8/+8
Use of_property_read_u32 to read the "reg" and "i2c-address" property instead of using of_get_property to check the return values. Signed-off-by: Aishwarya R <aishwaryarj100@gmail.com> Tested-by: Erhard Furtner <erhard_f@mailbox.org> Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
2020-04-26i2c: qup: remove unneeded conversion to boolJason Yan1-6/+4
The '>' expression itself is bool, no need to convert it to bool again. Signed-off-by: Jason Yan <yanaijie@huawei.com> Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org> Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
2020-04-26i2c: brcmstb: Fix handling of optional interruptDave Stevenson1-9/+11
If there is no interrupt defined then an error is logged due to the use of platform_get_irq. The driver handles not having the interrupt by falling back to polling, therefore make the appropriate call when claiming it. Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.com> Signed-off-by: Stefan Wahren <stefan.wahren@i2se.com> Acked-by: Florian Fainelli <f.fainelli@gmail.com> Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
2020-04-26i2c: regroup documentation of bindingsWolfram Sang1-27/+39
Some bindings are for the bus master, some are for the slaves. Regroup them and give them separate headings to make it clear. Also, remove references to "generic names" which is for nodes and not for compatibles. Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com> Reviewed-by: Rob Herring <robh@kernel.org> Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
2020-04-26i2c: stm32f7: allows for any bus frequencyAlain Volmat1-61/+64
Do not limitate to the 3 (100KHz, 400KHz, 1MHz) bus frequency but instead allows any frequency (if it matches timing requirements). Depending on the requested frequency, use the spec data from either Standard, Fast or Fast Plus mode. Hardcoding of min/max bus frequencies is removed and is instead computed. The driver do not use anymore speed identifier but instead handle directly the frequency and figure out the spec data (necessary for the computation of the timing register) based on the frequency. Signed-off-by: Alain Volmat <alain.volmat@st.com> Reviewed-by: Pierre-Yves MORDRET <pierre-yves.mordret@st.com> Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
2020-04-26dt-bindings: i2c: i2c-stm32f7: allow clock-frequency rangeAlain Volmat1-4/+4
For STM32F7, STM32H7 and STM32MP1 SoCs, if timing parameters match, the bus clock frequency can be from 1Hz to 1MHz. Signed-off-by: Alain Volmat <alain.volmat@st.com> Reviewed-by: Rob Herring <robh@kernel.org> Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
2020-04-26i2c: stm32: don't print an error on probe deferralEtienne Carriere3-6/+15
Do not print an error trace when deferring probe for some resource. Fix as well the error message in case of tx dma_request_chan failure. Signed-off-by: Etienne Carriere <etienne.carriere@st.com> Signed-off-by: Alain Volmat <alain.volmat@st.com> Reviewed-by: Pierre-Yves MORDRET <pierre-yves.mordret@st.com> Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
2020-04-26i2c: brcmstb: Allow to compile it on BCM2835Maxime Ripard1-2/+2
The BCM2711, supported by ARCH_BCM2835, also has a controller by the brcmstb driver so let's allow it to be compiled on that platform. Acked-by: Florian Fainelli <f.fainelli@gmail.com> Signed-off-by: Maxime Ripard <maxime@cerno.tech> Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
2020-04-26i2c: slave-eeprom: Make it possible to pre-load eeprom dataBjörn Ardö1-0/+25
If the slave eeprom has a "firmware-name" in devicetree, then pre-load the data in the eeprom with this file. Otherwise we init the eeprom with 0xFF. Signed-off-by: Patrick Williams <patrick@stwcx.xyz> Signed-off-by: Björn Ardö <bjorn.ardo@axis.com> [wsa: some cosmetic changes] Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
2020-04-18i2c: busses: remove duplicate dev_err()Dejin Zheng20-58/+20
it will print an error message by itself when platform_get_irq() goes wrong. so don't need dev_err() in here again. Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Suggested-by: Markus Elfring <Markus.Elfring@web.de> Signed-off-by: Dejin Zheng <zhengdejin5@gmail.com> Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
2020-04-18i2c: Add Qualcomm CCI I2C driverLoic Poulain3-0/+802
This commit adds I2C bus support for the Camera Control Interface (CCI) I2C controller found on the Qualcomm SoC processors. This I2C controller supports two masters and they are registered to the core. CCI versions supported in the driver are msm8916, msm8996 and sdm845. This is a rework of the patch posted by Vinod: https://patchwork.kernel.org/patch/10569961/ With additional fixes + most of the comments addressed. Signed-off-by: Todor Tomov <todor.tomov@linaro.org> Signed-off-by: Vinod Koul <vkoul@kernel.org> Signed-off-by: Loic Poulain <loic.poulain@linaro.org> Tested-by: Robert Foss <robert.foss@linaro.org> Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org> [wsa: removed err msg after platform_get_irq] Signed-off-by: Wolfram Sang <wsa@the-dreams.de>