linux-kernel - Re: [PATCH 3/3] dt-bindings: display: vop2: Add VP clock resets

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Date: Wed, 22 May 2024 11:31:36 -0400
From: Detlev Casanova <detlev.casanova@...labora.com>
To: Conor Dooley <conor@...nel.org>
Cc: Heiko Stübner <heiko@...ech.de>,
 linux-kernel@...r.kernel.org, Sandy Huang <hjc@...k-chips.com>,
 Andy Yan <andy.yan@...k-chips.com>,
 Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
 Maxime Ripard <mripard@...nel.org>, Thomas Zimmermann <tzimmermann@...e.de>,
 David Airlie <airlied@...il.com>, Daniel Vetter <daniel@...ll.ch>,
 Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>,
 Conor Dooley <conor+dt@...nel.org>,
 Heiko Stuebner <heiko.stuebner@...rry.de>,
 Sebastian Reichel <sebastian.reichel@...labora.com>,
 Dragan Simic <dsimic@...jaro.org>, Chris Morgan <macromorgan@...mail.com>,
 Diederik de Haas <didi.debian@...ow.org>,
 Boris Brezillon <boris.brezillon@...labora.com>,
 dri-devel@...ts.freedesktop.org, linux-arm-kernel@...ts.infradead.org,
 linux-rockchip@...ts.infradead.org, devicetree@...r.kernel.org
Subject: Re: [PATCH 3/3] dt-bindings: display: vop2: Add VP clock resets

On Tuesday, May 21, 2024 2:31:51 P.M. EDT Conor Dooley wrote:
> On Tue, May 21, 2024 at 01:15:46PM -0400, Detlev Casanova wrote:
> > On Wednesday, May 15, 2024 12:33:22 P.M. EDT Heiko Stübner wrote:
> > > Am Mittwoch, 15. Mai 2024, 18:19:29 CEST schrieb Conor Dooley:
> > > > On Tue, May 14, 2024 at 11:19:47AM -0400, Detlev Casanova wrote:
> > > > > Add the documentation for VOP2 video ports reset clocks.
> > > > > One reset can be set per video port.
> > > > > 
> > > > > Signed-off-by: Detlev Casanova <detlev.casanova@...labora.com>
> > > > 
> > > > Are these resets valid for all VOPs or just the one on 3588?
> > > 
> > > Not in that form.
> > > I.e. rk3588 has 4 video-ports (0-3), while rk3568 has 3 (0-2).
> > > 
> > > So the binding should take into account that rk3568 also has the
> > > SRST_VOP0 ... SRST_VOP2.
> > 
> > That is what is set in the example and the reason why I set minItems to 3
> > in the main bindings.
> > Then, the rk3588 specific part sets it to 4.
> > 
> > Isn't that enough ?
> 
> Not quite - you need to restrict maxItems to 3 for the other devices if
> the clocks are not valid. What you've got says that 4 clocks are
> possible but not needed on !rk3588.
> 
> Cheers,
> Conor.

I don't understand what "properties: resets: minItems: 3" means then. I 
thought it means that all devices should have at least 3 resets. Then the 
allOf below specifies the special case of rk3588 which has a minimum of 4 
resets.

Do I need to add 
        resets:
          minItems: 3
        reset-names:
          minItems: 3
in the "else:" ?

So in that case, I can remove "properties: resets: minItems: 3" above ?

Also, what do you mean "If the clocks are not valid" ?

Detlev.


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