why is gpiolib-legacy.o automatically compiled into gpiolib?

[rpjday@xxxxxxxxxxxxxx]

  for the first time, going through the docs to learn about the descriptor
interface for GPIO, and while the Doc directory seems to suggest that the
"legacy" interface is deprecated, the drivers/gpio/Makefile contains the
line:

  obj-$(CONFIG_GPIOLIB)		+= gpiolib-legacy.o

so is that "legacy" file still required for descriptor-based interface?
i'm sure i'll figure it out if i keep reading, but a quick clarification
would not go unappreciated.

rday

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