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Julius Werner 8f71503dbb i2c: Add software_i2c driver for I2C debugging and emulation 
This patch adds I2C emulation in software through raw toggling of the
SDA/SCL lines. Platforms need to provide bindings to toggle their
respective I2C busses for this to work (e.g. by pinmuxing them as GPIOs,
currently only enabled for Tegra).

This is mostly useful as a debugging feature, to drive unusual states on
a bus and closely monitor the device output without the need of a bus
analyzer. It provides a few functions to "wedge" an I2C bus by aborting
a transaction at certain points, which can be used to test if a system
can correctly recover from an ill-timed reboot. However, it can also
dynamically replace the existing I2C transfer functions and drive
some/all I2C transfers on the system, which might be useful if a driver
for the actual I2C controller hardware is not (yet) available.

Based on original code by Doug Anderson <dianders@chromium.org> and
Hung-ying Tyan <tyanh@chromium.org> for the ChromeOS embedded
controller project.

BRANCH=None
BUG=chrome-os-partner:28323
TEST=Spread tegra_software_i2c_init()/tegra_software_i2c_disable()
through the code and see that everything still works.

Change-Id: I9ee7ccbd1efb38206669a35d0c3318af16f8be63
Signed-off-by: Julius Werner <jwerner@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/198791
Reviewed-by: Doug Anderson <dianders@chromium.org>
Reviewed-by: Tom Warren <twarren@nvidia.com>
Reviewed-by: Stefan Reinauer <reinauer@chromium.org>
2014-05-19 20:34:31 +00:00
..
oprom ARM: Generalize armv7 as arm. 2013-10-02 09:18:44 +00:00
agp_device.c GPLv2 notice: Unify all files to just use one space in »MA 02110-1301« 2013-03-01 10:16:08 +01:00
cardbus_device.c GPLv2 notice: Unify all files to just use one space in »MA 02110-1301« 2013-03-01 10:16:08 +01:00
cpu_device.c GPLv2 notice: Unify all files to just use one space in »MA 02110-1301« 2013-03-01 10:16:08 +01:00
device.c Log device path during resource allocation 2013-07-09 13:27:45 -07:00
device_romstage.c GPLv2 notice: Unify all files to just use one space in »MA 02110-1301« 2013-03-01 10:16:08 +01:00
device_util.c pnp: Allow searching PNP device by port and device ID. 2014-04-29 03:11:19 +00:00
hypertransport.c GPLv2 notice: Unify all files to just use one space in »MA 02110-1301« 2013-03-01 10:16:08 +01:00
Kconfig i2c: Add software_i2c driver for I2C debugging and emulation 2014-05-19 20:34:31 +00:00
Makefile.inc i2c: Add software_i2c driver for I2C debugging and emulation 2014-05-19 20:34:31 +00:00
pci_device.c device: provide option to always load PCI option roms 2014-03-05 01:47:00 +00:00
pci_ops.c GPLv2 notice: Unify all files to just use one space in »MA 02110-1301« 2013-03-01 10:16:08 +01:00
pci_rom.c GPLv2 notice: Unify all files to just use one space in »MA 02110-1301« 2013-03-01 10:16:08 +01:00
pciexp_device.c GPLv2 notice: Unify all files to just use one space in »MA 02110-1301« 2013-03-01 10:16:08 +01:00
pcix_device.c GPLv2 notice: Unify all files to just use one space in »MA 02110-1301« 2013-03-01 10:16:08 +01:00
pnp_device.c pnp: Allow setting of misc register 0xf4 in device tree 2013-12-20 00:37:38 +00:00
root_device.c GPLv2 notice: Unify all files to just use one space in »MA 02110-1301« 2013-03-01 10:16:08 +01:00
smbus_ops.c GPLv2 notice: Unify all files to just use one space in »MA 02110-1301« 2013-03-01 10:16:08 +01:00
software_i2c.c i2c: Add software_i2c driver for I2C debugging and emulation 2014-05-19 20:34:31 +00:00