Hi Jean-Michel, On Tue, Feb 08, 2022 at 04:50:19PM +0100, Jean-Michel Hautbois wrote: > 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 As you support both CSI-2 D-PHY and CCP, you'll need bus-type (or make CSI-2 default), and optionally strobe property with CCP. > + > + 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>; > + }; > + }; > + }; > +... -- Kind regards, Sakari Ailus
