diff options
| author |   Doug Anderson <dianders@chromium.org> | 2013-04-16 06:29:00 +0000 |
|---|---|---|
| committer |   Wolfram Sang <wsa@the-dreams.de> | 2013-04-17 11:31:03 +0200 |
| commit | b81dfaa01f7057dde4a6356740c023db4e2ce83b (patch) | |
| tree | 52f3884bbfb112210c08003df5f4a048ece8e9be /drivers/i2c/muxes/Kconfig | |
| parent | i2c: at91: convert to dma_request_slave_channel_compat() (diff) | |
| download | linux-dev-b81dfaa01f7057dde4a6356740c023db4e2ce83b.tar.xz linux-dev-b81dfaa01f7057dde4a6356740c023db4e2ce83b.zip | |
i2c: mux: Add i2c-arb-gpio-challenge 'mux' driver
The i2c-arb-gpio-challenge driver implements an I2C arbitration scheme
where masters need to claim the bus with a GPIO before they can start
a transaction. This should generally only be used when standard I2C
multimaster isn't appropriate for some reason (errata/bugs).
This driver is based on code that Simon Glass added to the i2c-s3c2410
driver in the Chrome OS kernel 3.4 tree. The current incarnation as a
mux driver is as suggested by Grant Likely. See
<https://patchwork.kernel.org/patch/1877311/> for some history.
Signed-off-by: Doug Anderson <dianders@chromium.org>
Signed-off-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Naveen Krishna Chatradhi <ch.naveen@samsung.com>
Reviewed-by: Stephen Warren <swarren@nvidia.com>
Acked-by: Olof Johansson <olof@lixom.net>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
Diffstat (limited to 'drivers/i2c/muxes/Kconfig')
| -rw-r--r-- | drivers/i2c/muxes/Kconfig | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/drivers/i2c/muxes/Kconfig b/drivers/i2c/muxes/Kconfig index 0be5b83c08fa..5faf244d2476 100644 --- a/drivers/i2c/muxes/Kconfig +++ b/drivers/i2c/muxes/Kconfig @@ -5,6 +5,18 @@ menu "Multiplexer I2C Chip support" depends on I2C_MUX +config I2C_ARB_GPIO_CHALLENGE + tristate "GPIO-based I2C arbitration" + depends on GENERIC_GPIO && OF + help + If you say yes to this option, support will be included for an + I2C multimaster arbitration scheme using GPIOs and a challenge & + response mechanism where masters have to claim the bus by asserting + a GPIO. + + This driver can also be built as a module. If so, the module + will be called i2c-arb-gpio-challenge. + config I2C_MUX_GPIO tristate "GPIO-based I2C multiplexer" depends on GENERIC_GPIO |