linux-kernel - Re: [PATCH V2 3/3] drm/bridge: it66121: Add it66122 support

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Message-ID: <20250814110614.ziwsadnrxuoxknpk@oxidation>
Date: Thu, 14 Aug 2025 06:06:14 -0500
From: Nishanth Menon <nm@...com>
To: Tomi Valkeinen <tomi.valkeinen@...asonboard.com>
CC: <linux-kernel@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <dri-devel@...ts.freedesktop.org>,
        Robert Nelson <robertcnelson@...il.com>,
        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>,
        Jason Kridner <jkridner@...gleboard.org>, <afd@...com>
Subject: Re: [PATCH V2 3/3] drm/bridge: it66121: Add it66122 support

On 13:32-20250814, Tomi Valkeinen wrote:

Thanks for looking at this closer, Tomi.

> 
> On 13/08/2025 23:41, Nishanth Menon wrote:
> > The IT66122 is a drop in replacement for the IT66122. The part is
                                                      ^^

Uggh.. I just realized I made a typo here -> should have stated: "
"The IT66122 is a drop in replacement for the IT66121."

> > register compatible with what we use of the IT66121. The only relevant
> 
> The intro letter said "practical purposes is drop in replacement for
> IT66121". Here you say "with what we use of the IT66121".
> 
> What does that mean? Are they identical, except the IDs? Or are they

The only difference we had been told at the time about is that they are
identical from operation perspective except for the ID register (I
understand it is some sort of manufacturing change or something that is
not visible to s/w - Robert/Jason could add more).

> different, but the features and registers this driver uses are
> identical? Or different, but only identical wrt. the driver's features
> TI uses?

Minor clarification: This is used on BeagleBoard.org foundation boards
BeagleY-AI to be specific and not on Texas Instruments EVMs/SK.

Personally, I have just looked at the features that BeagleY-AI platform
uses. Though, searching via llms tells me there may be additional
features, but I don't have the specific details to confirm beyond what
the BeagleY-AI platform does.

I am hoping BeagleBoard.org Foundation folks OR anyone on the list who
have contacts with ITE Tech. INC. could probably add information.

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