linux-kernel - [PATCH 0/5] drm/bridge: simple-bridge: Add DPI color encoder support

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Message-Id: <20250304101530.969920-1-victor.liu@nxp.com>
Date: Tue,  4 Mar 2025 18:15:25 +0800
From: Liu Ying <victor.liu@....com>
To: dri-devel@...ts.freedesktop.org,
	devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org
Cc: 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,
	mripard@...nel.org,
	tzimmermann@...e.de,
	airlied@...il.com,
	simona@...ll.ch
Subject: [PATCH 0/5] drm/bridge: simple-bridge: Add DPI color encoder support

Hi,

This patch series aims to add DPI color encoder support as a simple DRM
bridge.  A DPI color encoder simply 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).  A real use case is that NXP i.MX93 11x11
EVK[2] and i.MX93 9x9 QSB[3] boards may connect a 24-bit DPI panel through
the Adafruit Kippah DPI hat.  The display pipeline is

i.MX93 LCDIF display controller(RGB888) ->
i.MX93 parallel display format configuration(RGB666) ->
on-board Raspiberry Pi compatible interface(RPi)(RGB666) ->
Adafruit Kippah DPI hat(RGB888 with 2 low padding bits in color components) ->
24-bit "ontat,kd50g21-40nt-a1" DPI panel

[1] https://learn.adafruit.com/adafruit-dpi-display-kippah-ttl-tft/downloads
[2] https://www.nxp.com/design/design-center/development-boards-and-designs/i.MX93EVK
[3] https://www.nxp.com/design/design-center/development-boards-and-designs/IMX93QSB

Liu Ying (5):
  dt-bindings: display: Document DPI color codings
  drm/of: Add drm_of_dpi_get_color_coding()
  dt-bindings: display: simple-bridge: Document DPI color encoder
  drm/bridge: simple-bridge: Add DPI color encoder support
  drm/bridge: simple-bridge: Add next panel support

 .../display/bridge/simple-bridge.yaml         |  89 +++++++++++-
 .../bindings/display/dpi-color-coding.yaml    |  90 ++++++++++++
 drivers/gpu/drm/bridge/Kconfig                |   1 +
 drivers/gpu/drm/bridge/simple-bridge.c        | 132 ++++++++++++++++--
 drivers/gpu/drm/drm_of.c                      |  43 ++++++
 include/drm/drm_of.h                          |   7 +
 6 files changed, 348 insertions(+), 14 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/display/dpi-color-coding.yaml

-- 
2.34.1