Qualcomm Technologies Inc. EMAC Gigabit Ethernet controller

This network controller consists of the MAC and
RGMII IO Macro for interfacing with PHY.

Required properties:

emac_hw node:
- compatible: Should be "qcom,emac-dwc-eqos"
- reg: Offset and length of the register regions for the mac and io-macro
- interrupts: Interrupt number used by this controller
- io-macro-info: Internal io-macro-info
- emac_emb_smmu: Internal emac smmu node

Optional:
- qcom,msm-bus,name: String representing the client-name
- qcom,msm-bus,num-cases: Total number of usecases
- qcom,msm-bus,num-paths: Total number of master-slave pairs
- qcom,msm-bus,vectors-KBps: Arrays of unsigned integers representing:
                             master-id, slave-id, arbitrated bandwidth
                             in KBps, instantaneous bandwidth in KBps
qcom,bus-vector-names: specifies string IDs for the corresponding bus vectors
                       in the same order as qcom,msm-bus,vectors-KBps property.
- qcom,arm-smmu: Boolean, if present enables EMAC SMMU support in sdxpoorwills.

Internal io-macro-info:
- io-macro-bypass-mode: <0 or 1> internal or external delay configuration
- io-interface: <rgmii/mii/rmii> PHY interface used

Internal emac_emb_smmu:
- compatible: Should be "qcom,emac-smmu-embedded".
- qcom,smmu-s1-bypass: Boolean, if present S1 bypass is enabled.
- iommus: Includes the <&smmu_phandle stream_id size> pair for each context
			bank.
- qcom,iova-mapping: <starting_address size> of the smmu context bank.

Example:

soc {
	emac_hw: qcom,emac@00020000 {
			compatible = "qcom,emac-dwc-eqos";
			qcom,arm-smmu;
			reg = <0x20000 0x10000>,
				  <0x36000 0x100>;
			reg-names = "emac-base", "rgmii-base";
			interrupts = <0 62 4>, <0 60 4>,
					<0 49 4>, <0 50 4>,
					<0 51 4>, <0 52 4>,
					<0 53 4>, <0 54 4>,
					<0 55 4>, <0 56 4>,
					<0 57 4>;
			interrupt-names = "sbd-intr", "lpi-intr",
				"tx-ch0-intr", "tx-ch1-intr",
				"tx-ch2-intr", "tx-ch3-intr",
				"tx-ch4-intr", "rx-ch0-intr",
				"rx-ch1-intr", "rx-ch2-intr",
				"rx-ch3-intr";
			qcom,msm-bus,name = "emac";
			qcom,msm-bus,num-cases = <3>;
			qcom,msm-bus,num-paths = <2>;
			qcom,msm-bus,vectors-KBps =
				<98 512 1250 0>, <1 781 0 40000>,  /* 10Mbps vote */
				<98 512 12500 0>, <1 781 0 40000>,  /* 100Mbps vote */
				<98 512 125000 0>, <1 781 0 40000>; /* 1000Mbps vote */
			qcom,bus-vector-names = "10", "100", "1000";
			io-macro-info {
				io-macro-bypass-mode = <0>;
				io-interface = "rgmii";
			};

			emac_emb_smmu: emac_emb_smmu {
				compatible = "qcom,emac-smmu-embedded";
				qcom,smmu-s1-bypass;
				iommus = <&apps_smmu 0x220 0xf>;
				qcom,iova-mapping = <0x80000000 0x40000000>;
			};
		};
}