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

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Date: Tue, 21 May 2024 19:31:51 +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 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.

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