linux-kernel - Re: [PATCH v4 2/6] dt-bindings: auxdisplay: add Titan Micro Electronics TM16xx

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Message-ID: <73A1F250-CBB4-4415-85F9-72599366E271@gmail.com>
Date: Mon, 25 Aug 2025 21:53:42 -0400
From: Jean-François Lessard <jefflessard3@...il.com>
To: Per Larsson <per@...vencia.se>
CC: Andy Shevchenko <andy@...nel.org>, Geert Uytterhoeven <geert@...ux-m68k.org>,
 Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>,
 Conor Dooley <conor+dt@...nel.org>, linux-kernel@...r.kernel.org,
 linux-leds@...r.kernel.org, devicetree@...r.kernel.org
Subject: Re: [PATCH v4 2/6] dt-bindings: auxdisplay: add Titan Micro Electronics TM16xx

Le 25 août 2025 15 h 08 min 36 s HAE, Per Larsson <per@...vencia.se> a écrit :
>On Sun, 24 Aug 2025 23:32:28 -0400
>Jean-François Lessard <jefflessard3@...il.com> wrote:
>
>> +  - Digits use 1-cell addressing with explicit segment mapping
>
>This new digits layout introduced in v3 implies that a
>different segment mapping can be used per digit by a
>single display/controller. Is that really a thing?
>

Board manufacturers typically use consistent patterns across digits, but some
use matrix-transposed layouts where grid/segment relationships are swapped
system-wide. The explicit coordinate mapping handles both standard and
transposed configurations.

Bottom line: I am not aware of different per digit 7-segment mappings on a
single display board.

Best Regards
Jean-François Lessard