* Rockchip RPMsg Platform Driver

The Rockchip RPMsg Platform Driver is used for Remote Processors Messaging.

Required Properties:

- compatible: should be one of the following.
    "rockchip,rk3568-rpmsg" for rk3568 SoCs.
- mbox-names: mailbox name for "rpmsg-rx" or "rpmsg-tx".
- mboxes: mailbox channel for rpmsg.
- rockchip,vdev-nums: number of rpmsg instance.
- rockchip,link-id: link_id of rpmsg instance. 4bit for master cpu_id and 4bit
    for remote cpu_id.

Optional Properties:

Example:

	rpmsg: rpmsg {
		compatible = "rockchip,rk3568-rpmsg";
		mbox-names = "rpmsg-rx", "rpmsg-tx";
		mboxes = <&mailbox 0 &mailbox 3>;
		rockchip,vdev-nums = <1>;
		rockchip,link-id = <0x03>;
		reg = <0x0 0x7c00000 0x0 0x20000>;
		memory-region = <&rpmsg_dma_reserved>;

		status = "okay";
	};

	reserved-memory {
		#address-cells = <2>;
		#size-cells = <2>;
		ranges;

		rpmsg_reserved: rpmsg@7c00000 {
			reg = <0x0 0x7c00000 0x0 0x400000>;
			no-map;
		};

		rpmsg_dma_reserved: rpmsg-dma@8000000 {
			compatible = "shared-dma-pool";
			reg = <0x0 0x8000000 0x0 0x100000>;
			no-map;
		};
	};