if you need explicit indexing then use an alias. My opinion however
is that explicit indexing is unnecessary and is just an artifact of
current i2c subsystem internals. There is already enough information
in the device tree to match i2c devices with i2c busses without
resorting to indexes.
Not for ALSA SoC V2 devices. In ASoC V2, the "fabric" driver needs to
identify
the codec by its specific I2C bus and address number. The codec
driver is not
an OF driver (normally), so it doesn't have access to any OF data.
It's just an
I2C driver, so its given an I2C address and some number that
represents an adapter.
Therefore, the fabric driver and the codec driver need to independently
determine the I2C bus number, and they need to match. The fabric
driver parses
the OF tree and looks up the cell-index property. The codec driver
uses the
adapter->nr variable. The patch I posted ensures that the two contain
the same
number.
Sounds to me like both simply need to use adapter->nr. For access to
Linux-internal data structures (and that is what this "index" is), you
shouldn't have to go via the device tree. If the Linux data structures
do not have the information you need, well, fix that.
Segher
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