i2c-bus at 0 twice?

[Johannes Berg]

johannes at quad:/proc/device-tree/ht at 0,f2000000/pci at 8/mac-io at 7/i2c at 18000$ ls
AAPL,address       built-in     i2c-bus at 0         linux,phandle
AAPL,address-step  compatible   interrupt-parent  name
AAPL,i2c-rate      device_type  interrupts        reg
#address-cells     i2c-bus at 0    linux,device      #size-cells

Somewhat odd that i2c-bus at 0 exists twice :) Anyone have an explanation?

johannes
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