linux-kernel - Re: [PATCH v3 2/3] media: dt-bindings: alvium: add document YAML binding

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Date:   Tue, 6 Jun 2023 19:07:42 +0100
From:   Conor Dooley <conor@...nel.org>
To:     Laurent Pinchart <laurent.pinchart@...asonboard.com>
Cc:     Tommaso Merciai <tomm.merciai@...il.com>,
        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

Hey Laurent, Tommaso,

On Tue, Jun 06, 2023 at 07:36:56PM +0300, Laurent Pinchart wrote:
> On Tue, Jun 06, 2023 at 05:54:03PM +0200, Tommaso Merciai wrote:

> > +  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.
> 
> > +      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.

Question about the property.
Why not make it have a minimum value of 1 and drop the special-case
behaviour for zero?

Cheers,
Conor.

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