linux-kernel - Re: [PATCH 0/2] drm/bridge: it66121: Add it66122 support

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Message-ID: <20250813202433.lsfiggziuzqjtfsq@passover>
Date: Wed, 13 Aug 2025 15:24:33 -0500
From: Nishanth Menon <nm@...com>
To: Andrew Davis <afd@...com>
CC: Conor Dooley <conor+dt@...nel.org>,
        Krzysztof Kozlowski
	<krzk+dt@...nel.org>,
        Rob Herring <robh@...nel.org>, David Airlie
	<airlied@...il.com>,
        Maxime Ripard <mripard@...nel.org>,
        Laurent Pinchart
	<Laurent.pinchart@...asonboard.com>,
        Neil Armstrong
	<neil.armstrong@...aro.org>,
        <linux-kernel@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <dri-devel@...ts.freedesktop.org>,
        Robert
 Nelson <robertcnelson@...il.com>,
        Jason Kridner <jkridner@...gleboard.org>
Subject: Re: [PATCH 0/2] drm/bridge: it66121: Add it66122 support

On 14:32-20250813, Andrew Davis wrote:
> On 8/13/25 2:08 PM, Nishanth Menon wrote:
> > Hi,
> > 
> > Add support for IT66122, which for all practical purposes is
> > drop in replacement for IT66121 except for the ID register
> > definition.
> > 
> > BeagleY-AI uses this new part as the old part is no longer in production
> > as far as I understand.
> > 
> > Now, BeaglePlay uses it66121 at the moment, but at some point, it might
> > end up flipping over to the new part.
> > 
> > An alternate implementation could be to drop the revision check or make
> > it66121 check include alternate ID check.. but that seems a little
> > non-standard.. Anyways, I suppose mediatek platforms will face this
> > problem as well at some point.
> > 
> 
> Hmmm, since these boards will probably have to switch parts mid-production
> it would cause us to need to have a new DT with the updated compatible
> just for a otherwise transparent revision. Might be better to just
> loosen the PID check so the alternative part work just the same.

I think we can get both world.. respinning this up in v2

-- 
Regards,
Nishanth Menon
Key (0xDDB5849D1736249D) / Fingerprint: F8A2 8693 54EB 8232 17A3  1A34 DDB5 849D 1736 249D
https://ti.com/opensource