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Message-ID: <ZcXwQA3IiDu1etH1@valkosipuli.retiisi.eu>
Date: Fri, 9 Feb 2024 09:28:32 +0000
From: Sakari Ailus <sakari.ailus@....fi>
To: Julien Massot <julien.massot@...labora.com>
Cc: linux-media@...r.kernel.org, kernel@...labora.com,
devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
mchehab@...nel.org, robh+dt@...nel.org,
krzysztof.kozlowski+dt@...aro.org, conor+dt@...nel.org
Subject: Re: [PATCH v3 1/4] dt-bindings: media: add Maxim MAX96717F GMSL2
Serializer
Hi Julien,
On Thu, Jan 11, 2024 at 02:03:46PM +0100, Julien Massot wrote:
> Add DT bindings for Maxim MAX96717F GMSL2 Serializer.
>
> Signed-off-by: Julien Massot <julien.massot@...labora.com>
> ---
> Change since v2:
> - remove reg description
> - add data lanes min/maxItems
> - Use generic node name
>
> ---
> .../bindings/media/i2c/maxim,max96717f.yaml | 147 ++++++++++++++++++
> 1 file changed, 147 insertions(+)
> create mode 100644 Documentation/devicetree/bindings/media/i2c/maxim,max96717f.yaml
>
> diff --git a/Documentation/devicetree/bindings/media/i2c/maxim,max96717f.yaml b/Documentation/devicetree/bindings/media/i2c/maxim,max96717f.yaml
> new file mode 100644
> index 000000000000..f31517b1dbc8
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/media/i2c/maxim,max96717f.yaml
> @@ -0,0 +1,147 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +# Copyright (C) 2024 Collabora Ltd.
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/media/i2c/maxim,max96717f.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: MAX96717 CSI-2 to GMSL2 Serializer
> +
> +maintainers:
> + - Julien Massot <julien.massot@...labora.com>
> +
> +description: |
> + The MAX96717F serializer converts MIPI CSI-2 D-PHY or C-PHY formatted input
Presumably this will need to be configured on the device? You should thus
require the bus-type property in the endpoint.
> + into GMSL2 serial outputs. The device allows the GMSL2 link to
> + simultaneously transmit bidirectional control-channel data while forward
> + video transmissions are in progress. The MAX96717F can connect to one
> + remotely located deserializer using industry-standard coax or STP
> + interconnects. The device cans operate in pixel or tunnel mode. In pixel mode
> + the MAX96717F can select the MIPI datatype, while the tunnel mode forward all the MIPI
> + data received by the serializer.
> + The MAX96717F supports Reference Over Reverse (channel),
> + to generate a clock output for the sensor from the GMSL reverse channel.
> +
> + The GMSL2 serial link operates at a fixed rate of 3Gbps in the
> + forward direction and 187.5Mbps in the reverse direction.
> +
> +properties:
> + compatible:
> + const: maxim,max96717f
> +
> + '#gpio-cells':
> + const: 2
> + description:
> + First cell is the GPIO pin number, second cell is the flags. The GPIO pin
> + number must be in range of [0, 10].
> +
> + gpio-controller: true
> +
> + '#clock-cells':
> + const: 0
> +
> + reg:
> + maxItems: 1
> +
> + ports:
> + $ref: /schemas/graph.yaml#/properties/ports
> +
> + properties:
> + port@0:
> + $ref: /schemas/graph.yaml#/$defs/port-base
> + unevaluatedProperties: false
> + description: CSI-2 Input port
> +
> + properties:
> + endpoint:
> + $ref: /schemas/media/video-interfaces.yaml#
> + unevaluatedProperties: false
> +
> + properties:
> + data-lanes:
> + minItems: 1
> + maxItems: 4
> +
> + required:
> + - data-lanes
> +
> + port@1:
> + $ref: /schemas/graph.yaml#/properties/port
> + unevaluatedProperties: false
> + description: GMSL Output port
> +
> + required:
> + - port@1
> +
> + i2c-gate:
> + $ref: /schemas/i2c/i2c-controller.yaml
> + unevaluatedProperties: false
> + description: |
I think you can remove ' |'.
> + The MAX96717F will forward the I2C requests from the
> + incoming GMSL2 link. Therefore, it supports an i2c-gate
> + subnode to configure a sensor.
> +
> +required:
> + - compatible
> + - reg
> + - ports
> +
> +additionalProperties: false
> +
> +examples:
> + - |
> + #include <dt-bindings/gpio/gpio.h>
> + #include <dt-bindings/media/video-interfaces.h>
> +
> + i2c {
> + #address-cells = <1>;
> + #size-cells = <0>;
> + serializer: serializer@40 {
> + compatible = "maxim,max96717f";
> + reg = <0x40>;
> + gpio-controller;
> + #gpio-cells = <2>;
> + #clock-cells = <0>;
> +
> + ports {
> + #address-cells = <1>;
> + #size-cells = <0>;
> +
> + port@0 {
> + reg = <0>;
> + max96717f_csi_in: endpoint {
> + data-lanes = <1 2 3 4>;
> + remote-endpoint = <&sensor_out>;
> + };
> + };
> +
> + port@1 {
> + reg = <1>;
> + max96917f_gmsl_out: endpoint {
> + remote-endpoint = <&deser_gmsl_in>;
> + };
> + };
> + };
> +
> + i2c-gate {
> + #address-cells = <1>;
> + #size-cells = <0>;
> + sensor@10 {
> + compatible = "st,st-vgxy61";
> + reg = <0x10>;
> + reset-gpios = <&serializer 0 GPIO_ACTIVE_LOW>;
> + clocks = <&serializer>;
> + VCORE-supply = <&v1v2>;
> + VDDIO-supply = <&v1v8>;
> + VANA-supply = <&v2v8>;
> + port {
> + sensor_out: endpoint {
> + data-lanes = <1 2 3 4>;
> + remote-endpoint = <&max96717f_csi_in>;
> + };
> + };
> + };
> + };
> + };
> + };
> +...
--
Kind regards,
Sakari Ailus
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