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Subject: Re: [RFC PATCH v4 03/12] dt-bindings: media: Add bindings for
 bcm2835-unicam
To:     Jean-Michel Hautbois <jeanmichel.hautbois@ideasonboard.com>
Cc:     dave.stevenson@raspberrypi.com, devicetree@vger.kernel.org,
        kernel-list@raspberrypi.com, laurent.pinchart@ideasonboard.com,
        linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org,
        linux-media@vger.kernel.org, linux-rpi-kernel@lists.infradead.org,
        lukasz@jany.st, mchehab@kernel.org, naush@raspberrypi.com,
        robh@kernel.org, tomi.valkeinen@ideasonboard.com,
        nsaenz@kernel.org, bcm-kernel-feedback-list@broadcom.com
References: <20220203175009.558868-1-jeanmichel.hautbois@ideasonboard.com>
 <20220203175009.558868-4-jeanmichel.hautbois@ideasonboard.com>
From:   Stefan Wahren <stefan.wahren@i2se.com>
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Message-ID: <e78fd121-460f-ffc9-02ca-a50a4aa88771@i2se.com>
Date:   Thu, 3 Feb 2022 21:01:47 +0100
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In-Reply-To: <20220203175009.558868-4-jeanmichel.hautbois@ideasonboard.com>
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Precedence: bulk

Hi Jean-Michel,

Am 03.02.22 um 18:50 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@raspberrypi.com>
> Signed-off-by: Naushir Patuck <naush@raspberrypi.com>
> Signed-off-by: Jean-Michel Hautbois <jeanmichel.hautbois@ideasonboard.com>
>
> ---
> 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   | 110 ++++++++++++++++++
>  1 file changed, 110 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..0725a0267c60
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/media/brcm,bcm2835-unicam.yaml
> @@ -0,0 +1,110 @@
> +# 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@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:
> +    items:
> +      - description: Unicam block.
> +      - description: Clock Manager Image (CMI) block.
thanks for describing the registers, but this is not what i meant with
adding "reg-names" in my last comment. Please look at the clocks below ...
> +
> +  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
> +
> +  
Best regards