[RFC PATCH v3 03/11] media: dt-bindings: media: Add bindings for bcm2835-unicam

[Stefan Wahren]

Hi Jean-Michel,

please drop the first "media:" before dt-bindings.

Am 02.02.22 um 18:56 schrieb Jean-Michel Hautbois:
> Introduce the dt-bindings documentation for bcm2835 CCP2/CSI2 Unicam
> camera interface. Also add a MAINTAINERS entry for it.
>
> Signed-off-by: Dave Stevenson <dave.stevenson at raspberrypi.com>
> Signed-off-by: Naushir Patuck <naush at raspberrypi.com>
> Signed-off-by: Jean-Michel Hautbois <jeanmichel.hautbois at ideasonboard.com>
> ---
> Dave: I assumed you were the maintainer for this file, as I based it on the
> bcm2835-unicam.txt file. Are  you happy to be added directly as the
> maintainer, or should this be specified as "Raspberry Pi Kernel
> Maintenance <kernel-list at raspberrypi.com>"
> ---
>  .../bindings/media/brcm,bcm2835-unicam.yaml   | 107 ++++++++++++++++++
>  MAINTAINERS                                   |   7 ++
>  2 files changed, 114 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..5bf41a8834fa
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/media/brcm,bcm2835-unicam.yaml
> @@ -0,0 +1,107 @@
> +# 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:
> +  - Dave Stevenson <dave.stevenson at 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 starting by 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:
> +    maxItems: 2
I would be nice to have reg-names here similar to the clocks.
> +
> +  interrupts:
> +    maxItems: 1
> +
> +  clocks:
> +    items:
> +      - description: Clock for the camera.
> +      - description: Clock for the vpu.
> +
> +  clock-names:
> +    items:
> +      - const: lp
> +      - const: vpu
> +
> +  power-domains:
> +    items:
> +      - description: Unicam power domain
> +
> +  num-data-lanes:
> +    items:
> +      - enum: [ 2, 4 ]
> +
> +  port:
> +    additionalProperties: false
> +    $ref: /schemas/graph.yaml#/$defs/port-base
> +
> +    properties:
> +      endpoint:
> +        $ref: /schemas/media/video-interfaces.yaml#
> +        unevaluatedProperties: false
> +
> +        properties:
> +          data-lanes: true
> +          link-frequencies: true
> +
> +        required:
> +          - data-lanes
> +          - link-frequencies
> +
> +    required:
> +      - endpoint
> +
> +required:
> +  - compatible
> +  - reg
> +  - interrupts
> +  - clocks
> +  - clock-names
> +  - power-domains
> +  - 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 at 7e801000 {
> +        compatible = "brcm,bcm2835-unicam";
> +        reg = <0x7e801000 0x800>,
> +              <0x7e802004 0x4>;
> +        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>;
> +        num-data-lanes = <2>;
> +        port {
> +                csi1_ep: endpoint {
> +                        remote-endpoint = <&imx219_0>;
> +                        data-lanes = <1 2>;
> +                        link-frequencies = /bits/ 64 <456000000>;
> +                };
> +        };
> +    };
> +...
> diff --git a/MAINTAINERS b/MAINTAINERS
> index a0770a861ca4..29344ea86847 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -3670,6 +3670,13 @@ N:	bcm113*
>  N:	bcm216*
>  N:	kona
>  
> +BROADCOM BCM2835 CAMERA DRIVER
> +M:	Raspberry Pi Kernel Maintenance <kernel-list at raspberrypi.com>
> +L:	linux-media at vger.kernel.org
> +S:	Maintained
> +F:	Documentation/devicetree/bindings/media/brcm,bcm2835-unicam.yaml
> +F:	arch/arm/boot/dts/bcm283x*
> +

I suggest to make the MAINTAINERS changes a single separate patch
instead of small incremental changes.

Best regards

>  BROADCOM BCM47XX MIPS ARCHITECTURE
>  M:	Hauke Mehrtens <hauke at hauke-m.de>
>  M:	Rafał Miłecki <zajec5 at gmail.com>