On Fri, Apr 21, 2023 at 01:18:27PM +0300, Tomi Valkeinen wrote: > From: Luca Ceresoli <luca@xxxxxxxxxxxxxxxx> > > 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 <luca@xxxxxxxxxxxxxxxx> > Signed-off-by: Tomi Valkeinen <tomi.valkeinen@xxxxxxxxxxxxxxxx> > Reviewed-by: Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx> This looks good to me. Dunno if the DT folks want the binding as a seperate patch, but this is good to go as far as I am concerned. Everything else can be fixed incrementally, I think. Also, this can go in via the media-tree, there shouldn't be any conflicts. Acked-by: Wolfram Sang <wsa@xxxxxxxxxx> Thanks for keeping at it!
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