Renesas R-Car Video Input driver (rcar_vin)
-------------------------------------------

The rcar_vin device provides video input capabilities for the Renesas R-Car
family of devices.

Each VIN instance has a single parallel input that supports RGB and YUV video,
with both external synchronization and BT.656 synchronization for the latter.
Depending on the instance the VIN input is connected to external SoC pins, or
on Gen3 to a CSI-2 receiver.

 - compatible: Must be one or more of the following
   - "renesas,vin-r8a77990" for the R8A77990 device
   - "renesas,vin-r8a77995" for the R8A77995 device
   - "renesas,vin-r8a77965" for the R8A77965 device
   - "renesas,vin-r8a7796" for the R8A7796 device
   - "renesas,vin-r8a7795" for the R8A7795 device
   - "renesas,vin-r8a7794" for the R8A7794 device
   - "renesas,vin-r8a7793" for the R8A7793 device
   - "renesas,vin-r8a7792" for the R8A7792 device
   - "renesas,vin-r8a7791" for the R8A7791 device
   - "renesas,vin-r8a7790" for the R8A7790 device
   - "renesas,vin-r8a7779" for the R8A7779 device
   - "renesas,vin-r8a7778" for the R8A7778 device
   - "renesas,rcar-gen2-vin" for a generic R-Car Gen2 compatible device.
   - "renesas,rcar-gen3-vin" for a generic R-Car Gen3 compatible device.

   When compatible with the generic version nodes must list the
   SoC-specific version corresponding to the platform first
   followed by the generic version.

 - reg: the register base and size for the device registers
 - interrupts: the interrupt for the device
 - clocks: Reference to the parent clock

Additionally, an alias named vinX will need to be created to specify
which video input device this is.

The per-board settings Gen2:
 - port sub-node describing a single endpoint connected to the vin
   as described in video-interfaces.txt[1]. Only the first one will
   be considered as each vin interface has one input port.

The per-board settings Gen3:

Gen3 can support both a single connected parallel input source from
external SoC pins (port0) and/or multiple parallel input sources from
local SoC CSI-2 receivers (port1) depending on SoC.

- renesas,id - ID number of the VIN, VINx in the documentation.
- ports
    - port0 - sub-node describing a single endpoint connected to the VIN
      from external SoC pins described in video-interfaces.txt[1]. Only
      the first one will be considered as each VIN interface has at most
      one set of SoC external input pins.
    - port1 - sub-nodes describing one or more endpoints connected to
      the VIN from local SoC CSI-2 receivers. The endpoint numbers must
      use the following schema.

        - Endpoint 0 - sub-node describing the endpoint which is CSI20
        - Endpoint 1 - sub-node describing the endpoint which is CSI21
        - Endpoint 2 - sub-node describing the endpoint which is CSI40
        - Endpoint 3 - sub-node describing the endpoint which is CSI41

Device node example Gen2
------------------------

        aliases {
                vin0 = &vin0;
        };

        vin0: vin@0xe6ef0000 {
                compatible = "renesas,vin-r8a7790", "renesas,rcar-gen2-vin";
                clocks = <&mstp8_clks R8A7790_CLK_VIN0>;
                reg = <0 0xe6ef0000 0 0x1000>;
                interrupts = <0 188 IRQ_TYPE_LEVEL_HIGH>;
                status = "disabled";
        };

Board setup example Gen2 (vin1 composite video input)
-----------------------------------------------------

&i2c2   {
        status = "ok";
        pinctrl-0 = <&i2c2_pins>;
        pinctrl-names = "default";

        adv7180@20 {
                compatible = "adi,adv7180";
                reg = <0x20>;
                remote = <&vin1>;

                port {
                        adv7180: endpoint {
                                bus-width = <8>;
                                remote-endpoint = <&vin1ep0>;
                        };
                };
        };
};

/* composite video input */
&vin1 {
        pinctrl-0 = <&vin1_pins>;
        pinctrl-names = "default";

        status = "ok";

        port {
                #address-cells = <1>;
                #size-cells = <0>;

                vin1ep0: endpoint {
                        remote-endpoint = <&adv7180>;
                        bus-width = <8>;
                };
        };
};

Device node example Gen3
------------------------

        vin0: video@e6ef0000 {
                compatible = "renesas,vin-r8a7795";
                reg = <0 0xe6ef0000 0 0x1000>;
                interrupts = <GIC_SPI 188 IRQ_TYPE_LEVEL_HIGH>;
                clocks = <&cpg CPG_MOD 811>;
                power-domains = <&sysc R8A7795_PD_ALWAYS_ON>;
                resets = <&cpg 811>;
                renesas,id = <0>;

                ports {
                        #address-cells = <1>;
                        #size-cells = <0>;

                        port@1 {
                                #address-cells = <1>;
                                #size-cells = <0>;

                                reg = <1>;

                                vin0csi20: endpoint@0 {
                                        reg = <0>;
                                        remote-endpoint= <&csi20vin0>;
                                };
                                vin0csi21: endpoint@1 {
                                        reg = <1>;
                                        remote-endpoint= <&csi21vin0>;
                                };
                                vin0csi40: endpoint@2 {
                                        reg = <2>;
                                        remote-endpoint= <&csi40vin0>;
                                };
                        };
                };
        };

        csi20: csi2@fea80000 {
                compatible = "renesas,r8a7795-csi2", "renesas,rcar-gen3-csi2";
                reg = <0 0xfea80000 0 0x10000>;
                interrupts = <GIC_SPI 184 IRQ_TYPE_LEVEL_HIGH>;
                clocks = <&cpg CPG_MOD 714>;
                power-domains = <&sysc R8A7795_PD_ALWAYS_ON>;
                resets = <&cpg 714>;

                ports {
                        #address-cells = <1>;
                        #size-cells = <0>;

                        port@0 {
                                reg = <0>;
                                csi20_in: endpoint {
                                        clock-lanes = <0>;
                                        data-lanes = <1>;
                                        remote-endpoint = <&adv7482_txb>;
                                };
                        };

                        port@1 {
                                #address-cells = <1>;
                                #size-cells = <0>;

                                reg = <1>;

                                csi20vin0: endpoint@0 {
                                        reg = <0>;
                                        remote-endpoint = <&vin0csi20>;
                                };
                        };
                };
        };

[1] video-interfaces.txt common video media interface
