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+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+# Copyright (C) 2020 Raspberry Pi (Trading) Ltd.
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/media/brcm,bcm2835-unicam.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Broadcom BCM283x Camera Interface (Unicam)
+
+maintainers:
+ - Dave Stevenson <dave.stevenson@raspberrypi.com>
+ - Raspberry Pi kernel list <kernel-list@raspberrypi.com>
+
+description:
+ The Unicam block on BCM283x SoCs is the receiver for either CSI-2 or CCP2
+ data from image sensors or similar devices.
+
+ The main platform using this SoC is the Raspberry Pi family of boards. On the
+ Pi the VideoCore firmware can also control this hardware block, and driving
+ it from two different processors will cause issues. To avoid this, the
+ firmware checks the device tree configuration during boot. If it finds device
+ tree nodes whose name starts with "csi" then it will stop the firmware
+ accessing the block, and it can then safely be used via the device tree
+ binding.
+
+properties:
+ compatible:
+ const: brcm,bcm2835-unicam
+
+ reg:
+ items:
+ - description: Main registers block
+ - description: Clock registers block
+
+ interrupts:
+ maxItems: 1
+
+ clocks:
+ minItems: 1
+ maxItems: 2
+
+ clock-names:
+ minItems: 1
+ items:
+ - const: lp
+ - const: core
+
+ power-domains:
+ maxItems: 1
+
+ brcm,num-data-lanes:
+ description:
+ The number of data lanes supported by this Unicam instance. It may be
+ larger than the number of data lanes routed on the board, as described by
+ the data-lanes property of the endpoint.
+ allOf:
+ - $ref: "/schemas/types.yaml#/definitions/uint32"
+ - enum: [1, 2, 4]
+
+ port:
+ type: object
+ description:
+ Input port node, as described in video-interfaces.txt.
+
+ properties:
+ endpoint:
+ type: object
+
+ properties:
+ clock-lanes:
+ items:
+ - const: 0
+
+ data-lanes:
+ description:
+ Lane reordering is not supported, items shall be in order,
+ starting at 1.
+ allOf:
+ - $ref: "/schemas/types.yaml#/definitions/uint32-array"
+ - maxItems: 1
+ items:
+ minItems: 1
+ maxItems: 4
+ items:
+ - const: 1
+ - const: 2
+ - const: 3
+ - const: 4
+
+ lane-polarities:
+ description:
+ Lane inversion is not supported. If the property is specified, it
+ shall contain all 0's.
+ allOf:
+ - $ref: "/schemas/types.yaml#/definitions/uint32-array"
+ - maxItems: 1
+ items:
+ minItems: 2
+ maxItems: 5
+ items:
+ - const: 0
+ - const: 0
+ - const: 0
+ - const: 0
+ - const: 0
+
+ remote-endpoint: true
+
+ required:
+ - data-lanes
+ - remote-endpoint
+
+ additionalProperties: false
+
+ required:
+ - endpoint
+
+ additionalProperties: false
+
+required:
+ - compatible
+ - reg
+ - interrupts
+ - clocks
+ - clock-names
+ - power-domains
+ - brcm,num-data-lanes
+ - port
+
+additionalProperties: false
+
+examples:
+ - |
+ #include <dt-bindings/clock/bcm2835.h>
+ #include <dt-bindings/interrupt-controller/arm-gic.h>
+ #include <dt-bindings/power/raspberrypi-power.h>
+
+ csi@7e801000 {
+ compatible = "brcm,bcm2835-unicam";
+ reg = <0x7e801000 0x800>,
+ <0x7e802004 0x4>;
+ interrupts = <2 7>;
+ clocks = <&clocks BCM2835_CLOCK_CAM1>;
+ clock-names = "lp";
+ power-domains = <&power RPI_POWER_DOMAIN_UNICAM1>;
+ brcm,num-data-lanes = <4>;
+
+ port {
+ csi1_ep: endpoint {
+ remote-endpoint = <&imx219_0>;
+ data-lanes = <1 2>;
+ };
+ };
+ };
+...