linux-kernel - [PATCH 02/21] dt-bindings: display: tilcdc: Add fifo-threshold property

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Message-Id: <20251126-feature_tilcdc-v1-2-49b9ef2e3aa0@bootlin.com>
Date: Wed, 26 Nov 2025 18:35:44 +0100
From: "Kory Maincent (TI.com)" <kory.maincent@...tlin.com>
To: Jyri Sarha <jyri.sarha@....fi>, 
 Tomi Valkeinen <tomi.valkeinen@...asonboard.com>, 
 Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>, 
 Maxime Ripard <mripard@...nel.org>, Thomas Zimmermann <tzimmermann@...e.de>, 
 David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>, 
 Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>, 
 Conor Dooley <conor+dt@...nel.org>, Russell King <linux@...linux.org.uk>, 
 Bartosz Golaszewski <brgl@...ev.pl>, Tony Lindgren <tony@...mide.com>, 
 Andrzej Hajda <andrzej.hajda@...el.com>, 
 Neil Armstrong <neil.armstrong@...aro.org>, Robert Foss <rfoss@...nel.org>, 
 Laurent Pinchart <Laurent.pinchart@...asonboard.com>, 
 Jonas Karlman <jonas@...boo.se>, Jernej Skrabec <jernej.skrabec@...il.com>
Cc: Markus Schneider-Pargmann <msp@...libre.com>, 
 Luca Ceresoli <luca.ceresoli@...tlin.com>, 
 Louis Chauvet <louis.chauvet@...tlin.com>, 
 Thomas Petazzoni <thomas.petazzoni@...tlin.com>, 
 Miguel Gazquez <miguel.gazquez@...tlin.com>, 
 dri-devel@...ts.freedesktop.org, devicetree@...r.kernel.org, 
 linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org, 
 linux-omap@...r.kernel.org, 
 "Kory Maincent (TI.com)" <kory.maincent@...tlin.com>
Subject: [PATCH 02/21] dt-bindings: display: tilcdc: Add fifo-threshold
 property

Add the fifo-threshold property to control the DMA FIFO threshold level,
which specifies the number of words that must be loaded before the DMA
FIFO becomes ready.

This property is needed to support the da850-evm board configuration
which requires a non-default FIFO threshold value. Currently, this value
is specified through the deprecated ti,tilcdc,panel binding. Adding this
property to the tilcdc binding allows for proper configuration while
migrating away from the non-standard panel binding.

The default value is 8 words, with valid values being powers of 2 from
8 to 512.

Related commit: 55da73fa7a68c ("ARM: dts: davinci: da850-evm: Increase
fifo threshold")

Signed-off-by: Kory Maincent (TI.com) <kory.maincent@...tlin.com>
---
 Documentation/devicetree/bindings/display/tilcdc/tilcdc.yaml | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/Documentation/devicetree/bindings/display/tilcdc/tilcdc.yaml b/Documentation/devicetree/bindings/display/tilcdc/tilcdc.yaml
index 34ac1fd04d5c6..bf6d506e25e17 100644
--- a/Documentation/devicetree/bindings/display/tilcdc/tilcdc.yaml
+++ b/Documentation/devicetree/bindings/display/tilcdc/tilcdc.yaml
@@ -46,6 +46,13 @@ properties:
       The maximum pixel clock that can be supported by the lcd controller
       in KHz.
 
+  fifo-threshold:
+    $ref: /schemas/types.yaml#/definitions/uint32
+    enum: [8, 16, 32, 64, 128, 256, 512]
+    description:
+      Number of words loaded before the DMA fifo becomes ready. The default
+      value is 8.
+
   blue-and-red-wiring:
     enum: [straight, crossed]
     description:

-- 
2.43.0