linux-kernel - Re: [PATCH 4/5] drm/bridge: simple-bridge: Add DPI color encoder support

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Message-ID: <c3b64134-a095-4d51-afe5-cef576a98d67@nxp.com>
Date: Thu, 6 Mar 2025 13:57:45 +0800
From: Liu Ying <victor.liu@....com>
To: Maxime Ripard <mripard@...nel.org>
Cc: dri-devel@...ts.freedesktop.org, devicetree@...r.kernel.org,
 linux-kernel@...r.kernel.org, robh@...nel.org, krzk+dt@...nel.org,
 conor+dt@...nel.org, andrzej.hajda@...el.com, neil.armstrong@...aro.org,
 rfoss@...nel.org, Laurent.pinchart@...asonboard.com, jonas@...boo.se,
 jernej.skrabec@...il.com, maarten.lankhorst@...ux.intel.com,
 tzimmermann@...e.de, airlied@...il.com, simona@...ll.ch
Subject: Re: [PATCH 4/5] drm/bridge: simple-bridge: Add DPI color encoder
 support

On 03/04/2025, Maxime Ripard wrote:
> On Tue, Mar 04, 2025 at 06:15:29PM +0800, Liu Ying wrote:
>> A DPI color encoder, as a simple display bridge, converts input DPI color
>> coding to output DPI color coding, like Adafruit Kippah DPI hat[1] which
>> converts input 18-bit pixel data to 24-bit pixel data(with 2 low padding
>> bits in every color component though). Add the DPI color encoder support
>> in the simple bridge driver.
>>
>> [1] https://learn.adafruit.com/adafruit-dpi-display-kippah-ttl-tft/downloads
>>
>> Signed-off-by: Liu Ying <victor.liu@....com>
>> ---
>>  drivers/gpu/drm/bridge/simple-bridge.c | 104 ++++++++++++++++++++++++-
>>  1 file changed, 102 insertions(+), 2 deletions(-)
> 
> Same thing, I think it's easy enough to write a transparent bridge to
> just put it into another driver.

I chose to touch this driver just because it seems that this DPI color
encoder fits the description of simple-bridge.yaml:

-8<-
description: |
  This binding supports transparent non-programmable bridges that don't
  require any configuration, with a single input and a single output.
-8<-

Anyway, if you think another driver is really needed and DT maintainers
accept to document this DPI color encoder, I may try to write one.

> 
> Maxime

-- 
Regards,
Liu Ying