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| author |   Luca Ceresoli <luca@lucaceresoli.net> | 2023-06-19 14:22:06 +0200 |
|---|---|---|
| committer |   Mauro Carvalho Chehab <mchehab@kernel.org> | 2023-07-14 13:11:44 +0200 |
| commit | a076a860acae77bbdcbd316541e5552e81fb1772 (patch) | |
| tree | d89211b36c516e4547da8dcbee44bc092b798a20 /drivers/i2c/Kconfig | |
| parent | media: dt-bindings: i2c: Add I2C Address Translator (ATR) (diff) | |
| download | wireguard-linux-a076a860acae77bbdcbd316541e5552e81fb1772.tar.xz wireguard-linux-a076a860acae77bbdcbd316541e5552e81fb1772.zip | |
media: i2c: add I2C Address Translator (ATR) support
An ATR is a device that looks similar to an i2c-mux: it has an I2C
slave "upstream" port and N master "downstream" ports, and forwards
transactions from upstream to the appropriate downstream port. But it
is different in that the forwarded transaction has a different slave
address. The address used on the upstream bus is called the "alias"
and is (potentially) different from the physical slave address of the
downstream chip.
Add a helper file (just like i2c-mux.c for a mux or switch) to allow
implementing ATR features in a device driver. The helper takes care of
adapter creation/destruction and translates addresses at each transaction.
Signed-off-by: Luca Ceresoli <luca@lucaceresoli.net>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Acked-by: Wolfram Sang <wsa@kernel.org>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>
Diffstat (limited to 'drivers/i2c/Kconfig')
| -rw-r--r-- | drivers/i2c/Kconfig | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/drivers/i2c/Kconfig b/drivers/i2c/Kconfig index 438905e2a1d0..c6d1a345ea6d 100644 --- a/drivers/i2c/Kconfig +++ b/drivers/i2c/Kconfig @@ -71,6 +71,15 @@ config I2C_MUX source "drivers/i2c/muxes/Kconfig" +config I2C_ATR + tristate "I2C Address Translator (ATR) support" + help + Enable support for I2C Address Translator (ATR) chips. + + An ATR allows accessing multiple I2C busses from a single + physical bus via address translation instead of bus selection as + i2c-muxes do. + config I2C_HELPER_AUTO bool "Autoselect pertinent helper modules" default y |