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

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Date: Wed, 22 May 2024 16:35:44 +0100
From: Conor Dooley <conor@...nel.org>
To: Detlev Casanova <detlev.casanova@...labora.com>
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 Wed, May 22, 2024 at 11:31:36AM -0400, Detlev Casanova wrote:
> 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.
> > 
> 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.

The change you made to the bindings allows someone to define either 3
(because of minItems 3) or 4 (because there are 4 items in the list) resets
for the rk3568.

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

No, you need to add maxItems: 3 to 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" ?

s/clocks/resets/ ;)

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