"snps,dwxgmac-<ip_version>", "snps,dwxgmac".
For backwards compatibility: "st,spear600-gmac" is also supported.
- reg: Address and length of the register set for the device
-- interrupt-parent: Should be the phandle for the interrupt controller
- that services interrupts for this device
- interrupts: Should contain the STMMAC interrupts
- interrupt-names: Should contain a list of interrupt names corresponding to
the interrupts in the interrupts property, if available.