It helps ATF to determine who called power on function (U-boot/Linux).
The corresponding ATF code was added in this commit:
mvebu: cp110: avoid pcie power on/off sequence when called from Linux
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| .. | ||
| Kconfig | ||
| Makefile | ||
| comphy_a3700.c | ||
| comphy_a3700.h | ||
| comphy_core.c | ||
| comphy_core.h | ||
| comphy_cp110.c | ||
| comphy_hpipe.h | ||
| comphy_mux.c | ||
| sata.h | ||
| utmi_phy.h | ||