Missing ./drivers/phy/qualcomm/phy-qcom-qmp.c

[epudwjuhc]

The tree is missing ./drivers/phy/qualcomm/phy-qcom-qmp.c

referenced by Makefile and will not build.

[OnePlusOSSAdmin]

There's no drivers/phy/qualcomm/phy-qcom-qmp.c, only phy-qcom-qmp.h.
If you find there's reference for the file, please provide detailed information.

[epudwjuhc]

Makefile references:

obj-$(CONFIG_PHY_QCOM_QMP)		+= \
	phy-qcom-qmp.o \
	phy-qcom-qmp-combo.o \
	phy-qcom-qmp-pcie.o \
	phy-qcom-qmp-pcie-msm8996.o \
	phy-qcom-qmp-ufs.o \
	phy-qcom-qmp-usb.o

no rule to make phy-qcom-qmp.o if there is no phy-qcom-qmp.c

[OnePlusOSSAdmin]

That's not an enabled config.
Also you could check upstream kernel source tree, there is no phy-qcom-qmp.c. https://github.com/torvalds/linux/tree/master/drivers/phy/qualcomm
If you do need it, you could get it from old kernel.