From: Dave Stevenson <dave.stevenson@xxxxxxxxxxxxxxx> Introduce the dt-bindings documentation for bcm2835 CCP2/CSI2 Unicam camera interface. Signed-off-by: Dave Stevenson <dave.stevenson@xxxxxxxxxxxxxxx> Co-developed-by: Naushir Patuck <naush@xxxxxxxxxxxxxxx> Signed-off-by: Naushir Patuck <naush@xxxxxxxxxxxxxxx> Co-developed-by: Jean-Michel Hautbois <jeanmichel.hautbois@xxxxxxxxxxxxxxxx> Signed-off-by: Jean-Michel Hautbois <jeanmichel.hautbois@xxxxxxxxxxxxxxxx> Reviewed-by: Laurent Pinchart <laurent.pinchart@xxxxxxxxxxxxxxxx> Reviewed-by: Rob Herring <robh@xxxxxxxxxx> Signed-off-by: Laurent Pinchart <laurent.pinchart@xxxxxxxxxxxxxxxx> --- Changes since v7: - Make bus-type mandatory - Refuse additional properties for endpoint Changes since v5: - Squash MAINTAINERS changes in Changes since v3: - 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 | 127 ++++++++++++++++++ MAINTAINERS | 6 + 2 files changed, 133 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..5fb5d60f069a --- /dev/null +++ b/Documentation/devicetree/bindings/media/brcm,bcm2835-unicam.yaml @@ -0,0 +1,127 @@ +# 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# + additionalProperties: false + + properties: + bus-type: + enum: [ 3, 4 ] + + clock-noncontinuous: true + data-lanes: true + remote-endpoint: true + + required: + - bus-type + - data-lanes + - remote-endpoint + + 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/media/video-interfaces.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>; + bus-type = <MEDIA_BUS_TYPE_CSI2_DPHY>; + data-lanes = <1 2>; + }; + }; + }; +... diff --git a/MAINTAINERS b/MAINTAINERS index cfa532ead715..e81ab3479702 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -4034,6 +4034,12 @@ N: bcm113* N: bcm216* N: kona +BROADCOM BCM2835 CAMERA DRIVERS +M: Raspberry Pi Kernel Maintenance <kernel-list@xxxxxxxxxxxxxxx> +L: linux-media@xxxxxxxxxxxxxxx +S: Maintained +F: Documentation/devicetree/bindings/media/brcm,bcm2835-unicam.yaml + BROADCOM BCM47XX MIPS ARCHITECTURE M: Hauke Mehrtens <hauke@xxxxxxxxxx> M: Rafał Miłecki <zajec5@xxxxxxxxx> -- Regards, Laurent Pinchart
