Qualcomm SMSM Point-to-Point (SMP2P)

Required properties:
-compatible : should be "qcom,smp2p"
-reg : the location of the irq register base memory
-qcom,remote-pid : the SMP2P remote processor ID (see smp2p_private_api.h)
-qcom,irq-bitmask : the sending irq bitmask
-interrupts : the receiving interrupt line

Example:

	qcom,smp2p-modem {
		compatible = "qcom,smp2p";
		reg = <0xf9011008 0x4>;
		qcom,remote-pid = <1>;
		qcom,irq-bitmask = <0x4000>;
		interrupts = <0 27 1>;
	};