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Message-Id: <20251126-feature_tilcdc-v1-1-49b9ef2e3aa0@bootlin.com>
Date: Wed, 26 Nov 2025 18:35:43 +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 01/21] dt-bindings: display: tilcdc: Convert to DT schema
Convert the device tree binding documentation for tilcdc
from plain text to DT binding schema.
Signed-off-by: Kory Maincent (TI.com) <kory.maincent@...tlin.com>
---
.../devicetree/bindings/display/tilcdc/tilcdc.txt | 82 ------------------
.../devicetree/bindings/display/tilcdc/tilcdc.yaml | 96 ++++++++++++++++++++++
2 files changed, 96 insertions(+), 82 deletions(-)
diff --git a/Documentation/devicetree/bindings/display/tilcdc/tilcdc.txt b/Documentation/devicetree/bindings/display/tilcdc/tilcdc.txt
deleted file mode 100644
index 3b3d0bbfcfff4..0000000000000
--- a/Documentation/devicetree/bindings/display/tilcdc/tilcdc.txt
+++ /dev/null
@@ -1,82 +0,0 @@
-Device-Tree bindings for tilcdc DRM driver
-
-Required properties:
- - compatible: value should be one of the following:
- - "ti,am33xx-tilcdc" for AM335x based boards
- - "ti,da850-tilcdc" for DA850/AM18x/OMAP-L138 based boards
- - interrupts: the interrupt number
- - reg: base address and size of the LCDC device
-
-Recommended properties:
- - ti,hwmods: Name of the hwmod associated to the LCDC
-
-Optional properties:
- - max-bandwidth: The maximum pixels per second that the memory
- interface / lcd controller combination can sustain
- - max-width: The maximum horizontal pixel width supported by
- the lcd controller.
- - max-pixelclock: The maximum pixel clock that can be supported
- by the lcd controller in KHz.
- - blue-and-red-wiring: Recognized values "straight" or "crossed".
- This property deals with the LCDC revision 2 (found on AM335x)
- color errata [1].
- - "straight" indicates normal wiring that supports RGB565,
- BGR888, and XBGR8888 color formats.
- - "crossed" indicates wiring that has blue and red wires
- crossed. This setup supports BGR565, RGB888 and XRGB8888
- formats.
- - If the property is not present or its value is not recognized
- the legacy mode is assumed. This configuration supports RGB565,
- RGB888 and XRGB8888 formats. However, depending on wiring, the red
- and blue colors are swapped in either 16 or 24-bit color modes.
-
-Optional nodes:
-
- - port/ports: to describe a connection to an external encoder. The
- binding follows Documentation/devicetree/bindings/graph.txt and
- supports a single port with a single endpoint.
-
- - See also Documentation/devicetree/bindings/display/tilcdc/panel.txt and
- Documentation/devicetree/bindings/display/bridge/ti,tfp410.yaml for connecting
- tfp410 DVI encoder or lcd panel to lcdc
-
-[1] There is an errata about AM335x color wiring. For 16-bit color mode
- the wires work as they should (LCD_DATA[0:4] is for Blue[3:7]),
- but for 24 bit color modes the wiring of blue and red components is
- crossed and LCD_DATA[0:4] is for Red[3:7] and LCD_DATA[11:15] is
- for Blue[3-7]. For more details see section 3.1.1 in AM335x
- Silicon Errata:
- https://www.ti.com/general/docs/lit/getliterature.tsp?baseLiteratureNumber=sprz360
-
-Example:
-
- fb: fb@...0e000 {
- compatible = "ti,am33xx-tilcdc", "ti,da850-tilcdc";
- reg = <0x4830e000 0x1000>;
- interrupt-parent = <&intc>;
- interrupts = <36>;
- ti,hwmods = "lcdc";
-
- blue-and-red-wiring = "crossed";
-
- port {
- lcdc_0: endpoint {
- remote-endpoint = <&hdmi_0>;
- };
- };
- };
-
- tda19988: tda19988 {
- compatible = "nxp,tda998x";
- reg = <0x70>;
-
- pinctrl-names = "default", "off";
- pinctrl-0 = <&nxp_hdmi_bonelt_pins>;
- pinctrl-1 = <&nxp_hdmi_bonelt_off_pins>;
-
- port {
- hdmi_0: endpoint {
- remote-endpoint = <&lcdc_0>;
- };
- };
- };
diff --git a/Documentation/devicetree/bindings/display/tilcdc/tilcdc.yaml b/Documentation/devicetree/bindings/display/tilcdc/tilcdc.yaml
new file mode 100644
index 0000000000000..34ac1fd04d5c6
--- /dev/null
+++ b/Documentation/devicetree/bindings/display/tilcdc/tilcdc.yaml
@@ -0,0 +1,96 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/display/tilcdc/tilcdc.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: TI LCD Controller, found on AM335x, DA850, AM18x and OMAP-L138
+
+maintainers:
+ - Kory Maincent <kory.maincent@...tlin.com>
+
+properties:
+ compatible:
+ enum:
+ - ti,am33xx-tilcdc
+ - ti,da850-tilcdc
+
+ reg:
+ maxItems: 1
+
+ interrupts:
+ maxItems: 1
+
+ port:
+ $ref: /schemas/graph.yaml#/properties/port
+
+ ti,hwmods:
+ $ref: /schemas/types.yaml#/definitions/string
+ description:
+ Name of the hwmod associated to the LCDC
+
+ max-bandwidth:
+ $ref: /schemas/types.yaml#/definitions/uint32
+ description:
+ The maximum pixels per second that the memory interface / lcd
+ controller combination can sustain
+
+ max-width:
+ $ref: /schemas/types.yaml#/definitions/uint32
+ description:
+ The maximum horizontal pixel width supported by the lcd controller.
+
+ max-pixelclock:
+ $ref: /schemas/types.yaml#/definitions/uint32
+ description:
+ The maximum pixel clock that can be supported by the lcd controller
+ in KHz.
+
+ blue-and-red-wiring:
+ enum: [straight, crossed]
+ description:
+ This property deals with the LCDC revision 2 (found on AM335x)
+ color errata [1].
+ - "straight" indicates normal wiring that supports RGB565,
+ BGR888, and XBGR8888 color formats.
+ - "crossed" indicates wiring that has blue and red wires
+ crossed. This setup supports BGR565, RGB888 and XRGB8888
+ formats.
+ - If the property is not present or its value is not recognized
+ the legacy mode is assumed. This configuration supports RGB565,
+ RGB888 and XRGB8888 formats. However, depending on wiring, the red
+ and blue colors are swapped in either 16 or 24-bit color modes.
+
+ [1] There is an errata about AM335x color wiring. For 16-bit color
+ mode the wires work as they should (LCD_DATA[0:4] is for Blue[3:7]),
+ but for 24 bit color modes the wiring of blue and red components is
+ crossed and LCD_DATA[0:4] is for Red[3:7] and LCD_DATA[11:15] is
+ for Blue[3-7]. For more details see section 3.1.1 in AM335x
+ Silicon Errata
+ https://www.ti.com/general/docs/lit/getliterature.tsp?baseLiteratureNumber=sprz360
+
+required:
+ - compatible
+ - interrupts
+ - reg
+ - port
+
+additionalProperties: false
+
+examples:
+ - |
+ tilcdc: tilcdc@...0e000 {
+ compatible = "ti,am33xx-tilcdc";
+ reg = <0x4830e000 0x1000>;
+ interrupt-parent = <&intc>;
+ interrupts = <36>;
+ ti,hwmods = "lcdc";
+
+ blue-and-red-wiring = "crossed";
+
+ port {
+ lcdc_0: endpoint {
+ remote-endpoint = <&hdmi_0>;
+ };
+ };
+ };
--
2.43.0
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