From: Dave Stevenson <dave.stevenson@xxxxxxxxxxxxxxx> Document the DT bindings for the CSI2/CCP2 receiver peripheral (known as Unicam) on BCM283x SoCs. Signed-off-by: Dave Stevenson <dave.stevenson@xxxxxxxxxxxxxxx> Signed-off-by: Laurent Pinchart <laurent.pinchart@xxxxxxxxxxxxxxxx> Signed-off-by: Jacopo Mondi <jacopo@xxxxxxxxxx> --- .../bindings/media/brcm,bcm2835-unicam.yaml | 155 ++++++++++++++++++ 1 file changed, 155 insertions(+) create mode 100644 Documentation/devicetree/bindings/media/brcm,bcm2835-unicam.yaml diff --git a/Documentation/devicetree/bindings/media/brcm,bcm2835-unicam.yaml b/Documentation/devicetree/bindings/media/brcm,bcm2835-unicam.yaml new file mode 100644 index 0000000000000..6ffc900e8ae8f --- /dev/null +++ b/Documentation/devicetree/bindings/media/brcm,bcm2835-unicam.yaml @@ -0,0 +1,155 @@ +# 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@xxxxxxxxxxxxxxx> + - Raspberry Pi kernel list <kernel-list@xxxxxxxxxxxxxxx> + +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>; + }; + }; + }; +... -- 2.29.1
