Virtual Media device
-------------------------------

Virtual Media device is used to manage all modules in image capture subsystem
of imx8qxp/qm platform. ISI(Image Sensor Interface), MIPI CSI, Parallel CSI
device node should be under it.

Required properties:
  - compatible    : must be "fsl,mxc-md";
  - reg           : Must contain an entry for each entry in reg-names;
  - #address-cells: should be <1>;
  - #size-cells   : should be <1>;
  - ranges        : use to handle address space

Optional properties:
  - parallel_csi: indicate that camera sensor use parallel interface



For example:

        cameradev: camera {
                compatible = "fsl,mxc-md", "simple-bus";
                #address-cells = <1>;
                #size-cells = <1>;
                ranges;

                isi@58100000 {
                        compatible = "fsl,imx8-isi";
                        reg = <0x58100000 0x10000>;
                        ...
                };
                csi@58227000 {
                        compatible = "fsl,mxc-mipi-csi2";
                        ...
                };
                ...
        };