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Back-port I2C ATR (Address translator) #2536

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Back-port I2C ATR (Address translator) #2536

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Commits on Jul 8, 2024

  1. 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 or
adapter creation/destruction and translates addresses at each transaction.

Signed-off-by: Luca Ceresoli <[email protected]>
Signed-off-by: Tomi Valkeinen <[email protected]>
Reviewed-by: Andy Shevchenko <[email protected]>
Acked-by: Wolfram Sang <[email protected]>
    @lucaceresoli @btogorean
    lucaceresoli authored and btogorean committed Jul 8, 2024
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  2. i2c: atr: allow unmapped addresses from child ATRs

    @Demon000 @btogorean
    Demon000 authored and btogorean committed Jul 8, 2024
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