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Date: Wed, 7 Jun 2023 09:11:00 +0200
From: Tommaso Merciai <tomm.merciai@...il.com>
To: Laurent Pinchart <laurent.pinchart@...asonboard.com>
Cc: jacopo.mondi@...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>,
Sakari Ailus <sakari.ailus@...ux.intel.com>,
Hans Verkuil <hverkuil@...all.nl>,
Marco Felsch <m.felsch@...gutronix.de>,
Gerald Loacker <gerald.loacker@...fvision.net>,
Mikhail Rudenko <mike.rudenko@...il.com>,
Shawn Tu <shawnx.tu@...el.com>,
Linus Walleij <linus.walleij@...aro.org>,
Benjamin Mugnier <benjamin.mugnier@...s.st.com>,
Krzysztof Hałasa <khalasa@...p.pl>,
Nicholas Roth <nicholas@...hemail.net>,
linux-media@...r.kernel.org, devicetree@...r.kernel.org,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 2/3] media: dt-bindings: alvium: add document YAML
binding
Hi Laurent,
On Tue, Jun 06, 2023 at 07:36:56PM +0300, Laurent Pinchart wrote:
> Hi Tommaso,
>
> Thank you for the patch.
>
> On Tue, Jun 06, 2023 at 05:54:03PM +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>
> > ---
> > 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
> >
> > .../media/i2c/alliedvision,alvium-csi2.yaml | 93 +++++++++++++++++++
> > 1 file changed, 93 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..191534e2f7bd
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/media/i2c/alliedvision,alvium-csi2.yaml
> > @@ -0,0 +1,93 @@
> > +# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
> > +%YAML 1.2
> > +---
> > +$id: http://devicetree.org/schemas/media/i2c/alliedvision,alvium.yaml#
> > +$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:
> > + Definition of the regulator used as interface power supply.
>
> The regulator that supplies power to the VCC_EXT_IN pins.
Oks. Ty.
>
> > +
> > + alliedvision,lp2hs-delay-us:
> > + maxItems: 1
> > + description:
> > + Low power to high speed delay time in microseconds.
>
> You can drop "in microseconds", that's implied by the suffix.
Oks.
>
> > + The purpose of this property is force a DPhy reset for the period
> > + described by the microseconds on the property, before it starts
> > + streaming. To be clear, with that value bigger than 0 the Alvium
> > + forces a dphy-reset on all lanes for that period. That means all
> > + lanes go up into low power state. This may help a csi2 rx ip to
> > + reset if that IP can't deal with a continous clock.
>
> I'd like to propose what I think is a clearer version:
>
> 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.
Thanks!
I'll fix this in v4 :)
Regards,
Tommaso
>
> Reviewed-by: Laurent Pinchart <laurent.pinchart@...asonboard.com>
>
> > +
> > + 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,
>
> Laurent Pinchart
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