Defined in 4 files as a label:
- arch/arm/boot/dts/bcm2835-rpi-a-plus.dts, line 99 (as a label)
- arch/arm/boot/dts/bcm2835-rpi-b-plus.dts, line 101 (as a label)
- arch/arm/boot/dts/bcm2835-rpi-zero.dts, line 96 (as a label)
- arch/arm/boot/dts/bcm2836-rpi-2-b.dts, line 101 (as a label)