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* IPQ806x DWMAC Ethernet controller

The device inherits all the properties of the dwmac/stmmac devices
described in the file net/stmmac.txt with the following changes.

Required properties:

- compatible: should be "qcom,ipq806x-gmac" along with "snps,dwmac"
	      and any applicable more detailed version number
	      described in net/stmmac.txt

- qcom,nss-common: should contain a phandle to a syscon device mapping the
		   nss-common registers.

- qcom,qsgmii-csr: should contain a phandle to a syscon device mapping the
		   qsgmii-csr registers.

Example:

	gmac: ethernet@37000000 {
		device_type = "network";
		compatible = "qcom,ipq806x-gmac";
		reg = <0x37000000 0x200000>;
		interrupts = <GIC_SPI 220 IRQ_TYPE_LEVEL_HIGH>;
		interrupt-names = "macirq";

		qcom,nss-common = <&nss_common>;
		qcom,qsgmii-csr = <&qsgmii_csr>;

		clocks = <&gcc GMAC_CORE1_CLK>;
		clock-names = "stmmaceth";

		resets = <&gcc GMAC_CORE1_RESET>;
		reset-names = "stmmaceth";
	};