Introduce the dt-bindings documentation for bcm2835 CCP2/CSI2 Unicam camera interface. Signed-off-by: Dave Stevenson <dave.stevenson@xxxxxxxxxxxxxxx> Signed-off-by: Naushir Patuck <naush@xxxxxxxxxxxxxxx> Signed-off-by: Jean-Michel Hautbois <jeanmichel.hautbois@xxxxxxxxxxxxxxxx> Reviewed-by: Laurent Pinchart <laurent.pinchart@xxxxxxxxxxxxxxxx> --- v4: - make MAINTAINERS its own patch - describe the reg and clocks correctly - use a vendor entry for the number of data lanes --- .../bindings/media/brcm,bcm2835-unicam.yaml | 117 ++++++++++++++++++ 1 file changed, 117 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 000000000000..1938ace23b3d --- /dev/null +++ b/Documentation/devicetree/bindings/media/brcm,bcm2835-unicam.yaml @@ -0,0 +1,117 @@ +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) +%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: + - Raspberry Pi Kernel Maintenance <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: Unicam block. + - description: Clock Manager Image (CMI) block. + + reg-names: + items: + - const: unicam + - const: cmi + + interrupts: + maxItems: 1 + + clocks: + items: + - description: Clock to drive the LP state machine of Unicam. + - description: Clock for the VPU (core clock). + + clock-names: + items: + - const: lp + - const: vpu + + power-domains: + items: + - description: Unicam power domain + + brcm,num-data-lanes: + $ref: /schemas/types.yaml#/definitions/uint32 + enum: [ 2, 4 ] + description: | + Number of CSI-2 data lanes supported by this Unicam instance. The number + of data lanes actively used is specified with the data-lanes endpoint + property. + + port: + $ref: /schemas/graph.yaml#/$defs/port-base + unevaluatedProperties: false + + properties: + endpoint: + $ref: /schemas/media/video-interfaces.yaml# + unevaluatedProperties: false + + properties: + data-lanes: true + + required: + - data-lanes + + required: + - endpoint + +required: + - compatible + - reg + - reg-names + - 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> + csi1: csi@7e801000 { + compatible = "brcm,bcm2835-unicam"; + reg = <0x7e801000 0x800>, + <0x7e802004 0x4>; + reg-names = "unicam", "cmi"; + interrupts = <GIC_SPI 103 IRQ_TYPE_LEVEL_HIGH>; + clocks = <&clocks BCM2835_CLOCK_CAM1>, + <&firmware_clocks 4>; + clock-names = "lp", "vpu"; + power-domains = <&power RPI_POWER_DOMAIN_UNICAM1>; + brcm,num-data-lanes = <2>; + port { + csi1_ep: endpoint { + remote-endpoint = <&imx219_0>; + data-lanes = <1 2>; + }; + }; + }; +... -- 2.32.0
