linux-kernel - Re: [PATCH v2 2/4] dt-bindings: media: Add bindings for raspberrypi,rp1-cfe

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Message-ID: <Zs8ErwJVTGYkHfJl@kekkonen.localdomain>
Date: Wed, 28 Aug 2024 11:06:23 +0000
From: Sakari Ailus <sakari.ailus@...ux.intel.com>
To: Tomi Valkeinen <tomi.valkeinen@...asonboard.com>
Cc: Mauro Carvalho Chehab <mchehab@...nel.org>,
	Raspberry Pi Kernel Maintenance <kernel-list@...pberrypi.com>,
	Rob Herring <robh+dt@...nel.org>,
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Florian Fainelli <florian.fainelli@...adcom.com>,
	Broadcom internal kernel review list <bcm-kernel-feedback-list@...adcom.com>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
	devicetree@...r.kernel.org, linux-rpi-kernel@...ts.infradead.org,
	linux-arm-kernel@...ts.infradead.org,
	Naushir Patuck <naush@...pberrypi.com>,
	Laurent Pinchart <laurent.pinchart@...asonboard.com>,
	Jacopo Mondi <jacopo.mondi@...asonboard.com>,
	Kieran Bingham <kieran.bingham@...asonboard.com>,
	20240531080707.34568-1-jacopo.mondi@...asonboard.com
Subject: Re: [PATCH v2 2/4] dt-bindings: media: Add bindings for
 raspberrypi,rp1-cfe

Moi,

Thanks for the set!

On Thu, Jun 20, 2024 at 02:07:51PM +0300, Tomi Valkeinen wrote:
> Add DT bindings for raspberrypi,rp1-cfe.
> 
> Signed-off-by: Tomi Valkeinen <tomi.valkeinen@...asonboard.com>
> ---
>  .../bindings/media/raspberrypi,rp1-cfe.yaml        | 98 ++++++++++++++++++++++
>  1 file changed, 98 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/media/raspberrypi,rp1-cfe.yaml b/Documentation/devicetree/bindings/media/raspberrypi,rp1-cfe.yaml
> new file mode 100644
> index 000000000000..851533de2305
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/media/raspberrypi,rp1-cfe.yaml
> @@ -0,0 +1,98 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/media/raspberrypi,rp1-cfe.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Raspberry Pi PiSP Camera Front End
> +
> +maintainers:
> +  - Tomi Valkeinen <tomi.valkeinen@...asonboard.com>
> +  - Raspberry Pi Kernel Maintenance <kernel-list@...pberrypi.com>
> +
> +description: |
> +  The Raspberry Pi PiSP Camera Front End is a module in Raspberrypi 5's RP1 I/O
> +  controller, that contains:
> +  - MIPI D-PHY
> +  - MIPI CSI-2 receiver
> +  - Simple image processor (called PiSP Front End, or FE)
> +
> +  The FE documentation is available at:
> +  https://datasheets.raspberrypi.com/camera/raspberry-pi-image-signal-processor-specification.pdf
> +
> +  The PHY and CSI-2 receiver part have no public documentation.
> +
> +properties:
> +  compatible:
> +    items:
> +      - const: raspberrypi,rp1-cfe
> +
> +  reg:
> +    items:
> +      - description: CSI-2 registers
> +      - description: D-PHY registers
> +      - description: MIPI CFG (a simple top-level mux) registers
> +      - description: FE registers
> +
> +  interrupts:
> +    maxItems: 1
> +
> +  clocks:
> +    maxItems: 1
> +
> +  port:
> +    $ref: /schemas/graph.yaml#/$defs/port-base
> +    additionalProperties: false
> +    description: CSI-2 RX Port
> +
> +    properties:
> +      endpoint:
> +        $ref: video-interfaces.yaml#
> +        unevaluatedProperties: false
> +
> +        properties:
> +          data-lanes:
> +            minItems: 1
> +            maxItems: 4
> +
> +          clock-lanes:
> +            maxItems: 1

minItems needs to be 1 as well.

Or... is this actually configurable in hardware?

> +
> +        required:
> +          - clock-lanes
> +          - data-lanes
> +
> +required:
> +  - compatible
> +  - reg
> +  - interrupts
> +  - clocks
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    rp1 {
> +      #address-cells = <2>;
> +      #size-cells = <2>;
> +
> +      csi@...000 {
> +        compatible = "raspberrypi,rp1-cfe";
> +        reg = <0xc0 0x40110000 0x0 0x100>,
> +              <0xc0 0x40114000 0x0 0x100>,
> +              <0xc0 0x40120000 0x0 0x100>,
> +              <0xc0 0x40124000 0x0 0x1000>;
> +
> +        interrupts = <42>;
> +
> +        clocks = <&rp1_clocks>;
> +
> +        port {
> +          csi_ep: endpoint {
> +            remote-endpoint = <&cam_endpoint>;
> +            clock-lanes = <0>;
> +            data-lanes = <1 2>;
> +          };
> +        };
> +      };
> +    };
> 

-- 
Terveisin,

Sakari Ailus