kernel/linux.git/drivers/i2c/i2c-core-base.c, branch linux-4.16.y

Merge branch 'i2c/for-4.16' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux

2018-02-04T18:57:43+00:00

Pull i2c updates from Wolfram Sang: "I2C has the following changes for you: - new flag to mark DMA safe buffers in i2c_msg. Also, some infrastructure around it. And docs. - huge refactoring of the at24 driver led by the new maintainer Bartosz - update I2C bus recovery to send STOP after recovery - conversion from gpio to gpiod for I2C bus recovery - adding a fault-injector to the i2c-gpio driver - lots of small driver improvements, and bigger ones to i2c-sh_mobile" * 'i2c/for-4.16' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux: (99 commits) i2c: mv64xxx: Add myself as maintainer for this driver i2c: mv64xxx: Fix clock resource by adding an optional bus clock i2c: mv64xxx: Remove useless test before clk_disable_unprepare i2c: mxs: use true and false for boolean values i2c: meson: update doc description to fix build warnings i2c: meson: add configurable divider factors dt-bindings: i2c: update documentation for the Meson-AXG i2c: imx-lpi2c: add runtime pm support i2c: rcar: fix some trivial typos in comments i2c: davinci: fix the cpufreq transition i2c: rk3x: add proper kerneldoc header i2c: rk3x: account for const type of of_device_id.data i2c: acorn: remove outdated path from file header i2c: acorn: add MODULE_LICENSE tag i2c: rcar: implement bus recovery i2c: send STOP after successful bus recovery i2c: ensure SDA is released in recovery if SDA is controllable i2c: add 'set_sda' to bus_recovery_info i2c: add identifier in declarations for i2c_bus_recovery i2c: make kerneldoc about bus recovery more precise ...

i2c: core: decrease reference count of device node in i2c_unregister_device

2018-01-17T14:23:31+00:00

Reference count of device node was increased in of_i2c_register_device, but without decreasing it in i2c_unregister_device. Then the added device node will never be released. Fix this by adding the of_node_put. Signed-off-by: Lixin Wang Tested-by: Wolfram Sang Signed-off-by: Wolfram Sang Cc: stable@kernel.org

i2c: send STOP after successful bus recovery

2018-01-15T23:04:42+00:00

If we managed to get a client release SDA again, send a STOP afterwards to make sure we have a consistent state on the bus again. Tested-by: Phil Reid Signed-off-by: Wolfram Sang Signed-off-by: Wolfram Sang

i2c: ensure SDA is released in recovery if SDA is controllable

2018-01-15T23:04:30+00:00

If we have a function to control SDA, we should ensure that SDA is not held down by us. So, release the GPIO in this case. Tested-by: Phil Reid Signed-off-by: Wolfram Sang Signed-off-by: Wolfram Sang

i2c: add 'set_sda' to bus_recovery_info

2018-01-15T23:04:19+00:00

This will be needed when we want to create STOP conditions, too, later. Create the needed fields and populate them for the GPIO case if the GPIO is set to output. Tested-by: Phil Reid Signed-off-by: Wolfram Sang Reviewed-by: Linus Walleij Signed-off-by: Wolfram Sang

i2c: refactor i2c_master_{send_recv}

2017-12-03T20:22:29+00:00

Those two functions are very similar, the only differences are that one needs the I2C_M_RD flag for its message while the other one needs the buffer casted to drop the const. Introduce a generic helper which allows to specify the flags (also needed later for DMA safe variants of these calls) and let the casting be done in the inlining functions which are now calling the new helper function. Signed-off-by: Wolfram Sang Reviewed-by: Jonathan Cameron Signed-off-by: Wolfram Sang

i2c: add helpers to ease DMA handling

2017-12-03T19:47:44+00:00

One helper checks if DMA is suitable and optionally creates a bounce buffer, if not. The other function returns the bounce buffer and makes sure the data is properly copied back to the message. Reviewed-by: Jonathan Cameron Signed-off-by: Wolfram Sang Signed-off-by: Wolfram Sang

i2c: core: fix compile issue related to incorrect gpio header

2017-11-28T09:44:00+00:00

The correct header to include for the gpiod interface is . Fixes: 3991c5c80beaf7eb9 ("i2c: Switch to using gpiod interface for gpio bus recovery") Signed-off-by: Phil Reid Reviewed-by: Jarkko Nikula Signed-off-by: Wolfram Sang

i2c: remove legacy integer scl/sda gpio for recovery

2017-11-27T17:40:01+00:00

Remove all reference to code related to using integer based ids for scl/sda gpio for bus recovery. All in tree drivers are now using the gpio descriptors to specific the required gpios. Reviewed-by: Andy Shevchenko Signed-off-by: Phil Reid Reviewed-by: Jarkko Nikula Signed-off-by: Wolfram Sang

i2c: Switch to using gpiod interface for gpio bus recovery

2017-11-27T17:39:13+00:00

Currently the i2c gpio recovery code uses gpio integer interface instead of the gpiod. This change switch the core code to use the gpiod while still retaining compatibility with the gpio integer interface. This will allow individual driver to be updated and tested individual to switch to using the gpiod interface. Reviewed-by: Jarkko Nikula Reviewed-by: Andy Shevchenko Signed-off-by: Phil Reid Signed-off-by: Wolfram Sang