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Message-ID: <ZILkSEllSfSGD8XK@kekkonen.localdomain>
Date: Fri, 9 Jun 2023 08:35:20 +0000
From: Sakari Ailus <sakari.ailus@...ux.intel.com>
To: Tommaso Merciai <tomm.merciai@...il.com>
Cc: jacopo.mondi@...asonboard.com, laurent.pinchart@...asonboard.com,
martin.hecht@...et.eu, michael.roeder@...et.eu,
linuxfancy@...glegroups.com,
Mauro Carvalho Chehab <mchehab@...nel.org>,
Rob Herring <robh+dt@...nel.org>,
Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
Conor Dooley <conor+dt@...nel.org>,
Liam Girdwood <lgirdwood@...il.com>,
Mark Brown <broonie@...nel.org>,
Hans Verkuil <hverkuil@...all.nl>,
Marco Felsch <m.felsch@...gutronix.de>,
Gerald Loacker <gerald.loacker@...fvision.net>,
Shawn Tu <shawnx.tu@...el.com>,
Krzysztof Hałasa <khalasa@...p.pl>,
Linus Walleij <linus.walleij@...aro.org>,
Nicholas Roth <nicholas@...hemail.net>,
Mikhail Rudenko <mike.rudenko@...il.com>,
Benjamin Mugnier <benjamin.mugnier@...s.st.com>,
linux-media@...r.kernel.org, devicetree@...r.kernel.org,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH v5 2/3] media: dt-bindings: alvium: add document YAML
binding
Hi Tommaso,
On Thu, Jun 08, 2023 at 10:31:15AM +0200, Tommaso Merciai wrote:
> Add documentation of device tree in YAML schema for the ALVIUM
> Camera from Allied Vision Inc.
>
> References:
> - https://www.alliedvision.com/en/products/embedded-vision-solutions
>
> Signed-off-by: Tommaso Merciai <tomm.merciai@...il.com>
> Reviewed-by: Laurent Pinchart <laurent.pinchart@...asonboard.com>
> ---
> Changes since v1:
> - Fixed build error as suggested by RHerring bot
>
> Changes since v2:
> - Fixed License as suggested by KKozlowski/CDooley
> - Removed rotation property as suggested by CDooley/LPinchart
> - Fixed example node name as suggested by CDooley
> - Fixed title as suggested by LPinchart
> - Fixed compatible name as suggested by LPinchart
> - Removed clock as suggested by LPinchart
> - Removed gpios not as suggested by LPinchart
> - Renamed property name streamon-delay into alliedvision,lp2hs-delay-us
> - Fixed vendor prefix, unit append as suggested by KKozlowski
> - Fixed data-lanes
> - Fixed blank space + example indentation (from 6 -> 4 space) as suggested by KKozlowski
> - Dropped status into example as suggested by KKozlowski
> - Added vcc-ext-in supply as suggested by LPinchart
> - Dropped pinctrl into example as suggested by LPinchart
>
> Changes since v3:
> - Fixed vcc-ext-in-supply description as suggested by LPinchart
> - Fixed alliedvision,lp2hs-delay-us description as suggested by LPinchart
> - Added maximum to alliedvision,lp2hs-delay-us as suggested by LPinchart
> - Collected Reviewed-by tag from LPinchart
>
> Changes since v4:
> - Fixed id as reported by RHerring bot and LPinchart
> - Add minimum into alliedvision,lp2hs-delay-us as suggested by CDooley
> - Tested using make dt_binding_check DT_SCHEMA_FILES=alliedvision,alvium-csi2.yaml
>
> .../media/i2c/alliedvision,alvium-csi2.yaml | 97 +++++++++++++++++++
> 1 file changed, 97 insertions(+)
> create mode 100644 Documentation/devicetree/bindings/media/i2c/alliedvision,alvium-csi2.yaml
>
> diff --git a/Documentation/devicetree/bindings/media/i2c/alliedvision,alvium-csi2.yaml b/Documentation/devicetree/bindings/media/i2c/alliedvision,alvium-csi2.yaml
> new file mode 100644
> index 000000000000..c771e5039641
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/media/i2c/alliedvision,alvium-csi2.yaml
> @@ -0,0 +1,97 @@
> +# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/media/i2c/alliedvision,alvium-csi2.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Allied Vision Alvium Camera
> +
> +maintainers:
> + - Tommaso Merciai <tomm.merciai@...il.com>
> + - Martin Hecht <martin.hecht@...et.eu>
> +
> +allOf:
> + - $ref: /schemas/media/video-interface-devices.yaml#
> +
> +properties:
> + compatible:
> + const: alliedvision,alvium-csi2
> +
> + reg:
> + maxItems: 1
> +
> + vcc-ext-in-supply:
> + description: |
> + The regulator that supplies power to the VCC_EXT_IN pins.
> +
> + alliedvision,lp2hs-delay-us:
> + minimum: 1
> + maximum: 150000
> + description: |
> + Low power to high speed delay time.
> +
> + If the value is larger than 0, the camera forces a reset of all
> + D-PHY lanes for the duration specified by this property. All lanes
> + will transition to the low-power state and back to the high-speed
> + state after the delay. Otherwise the lanes will transition to and
> + remain in the high-speed state immediately after power on.
> +
> + This is meant to help CSI-2 receivers synchronizing their D-PHY
> + RX.
Why do you need this? D-PHY TX is obviously controlled by the driver.
Explicit control of PHY initialisation is of course best option when
combined with some receivers, done via driver's pre_streamon and s_stream
callbacks. Can't your hardware do that?
> +
> + port:
> + description: Digital Output Port
> + $ref: /schemas/graph.yaml#/$defs/port-base
> + additionalProperties: false
> +
> + properties:
> + endpoint:
> + $ref: /schemas/media/video-interfaces.yaml#
> + unevaluatedProperties: false
> +
> + properties:
> + link-frequencies: true
> +
> + data-lanes:
> + minItems: 1
> + items:
> + - const: 1
> + - const: 2
> + - const: 3
> + - const: 4
> +
> + required:
> + - data-lanes
> + - link-frequencies
> +
> +required:
> + - compatible
> + - reg
> + - vcc-ext-in-supply
> + - port
> +
> +additionalProperties: false
> +
> +examples:
> + - |
> + i2c {
> + #address-cells = <1>;
> + #size-cells = <0>;
> +
> + alvium: camera@3c {
> + compatible = "alliedvision,alvium-csi2";
> + reg = <0x3c>;
> + vcc-ext-in-supply = <®_vcc_ext_in>;
> + alliedvision,lp2hs-delay-us = <20>;
> +
> + port {
> + alvium_out: endpoint {
> + remote-endpoint = <&mipi_csi_0_in>;
> + data-lanes = <1 2 3 4>;
> + link-frequencies = /bits/ 64 <681250000>;
> + };
> + };
> + };
> + };
> +
> +...
--
Regards,
Sakari Ailus
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