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Message-ID: <20250820144128.17603-2-mike.looijmans@topic.nl>
Date: Wed, 20 Aug 2025 16:40:34 +0200
From: Mike Looijmans <mike.looijmans@...ic.nl>
To: dri-devel@...ts.freedesktop.org
CC: Mike Looijmans <mike.looijmans@...ic.nl>,
Andrzej Hajda <andrzej.hajda@...el.com>,
Conor Dooley <conor+dt@...nel.org>,
David Airlie <airlied@...il.com>,
Jernej Skrabec <jernej.skrabec@...il.com>,
Jonas Karlman <jonas@...boo.se>,
Krzysztof Kozlowski <krzk+dt@...nel.org>,
Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
Maxime Ripard <mripard@...nel.org>,
Neil Armstrong <neil.armstrong@...aro.org>,
Rob Herring <robh@...nel.org>,
Robert Foss <rfoss@...nel.org>,
Simona Vetter <simona@...ll.ch>,
Thomas Zimmermann <tzimmermann@...e.de>,
devicetree@...r.kernel.org,
linux-kernel@...r.kernel.org
Subject: [PATCH v3 1/2] dt-bindings: drm/bridge: ti-tmds181: Add TI TMDS181 and SN65DP159 bindings
Add DT binding document for TI TMDS181 and SN65DP159 HDMI retimers.
The two chips have similar register maps, but different applications
(source vs. sink).
Signed-off-by: Mike Looijmans <mike.looijmans@...ic.nl>
---
Changes in v3:
Fix duplicate links
Add vcc-supply and vdd-supply
Fix missing type for ti,slew-rate
Changes in v2:
Document driver specific bindings like slew-rate and threshold
.../bindings/display/bridge/ti,tmds181.yaml | 150 ++++++++++++++++++
1 file changed, 150 insertions(+)
create mode 100644 Documentation/devicetree/bindings/display/bridge/ti,tmds181.yaml
diff --git a/Documentation/devicetree/bindings/display/bridge/ti,tmds181.yaml b/Documentation/devicetree/bindings/display/bridge/ti,tmds181.yaml
new file mode 100644
index 000000000000..7433e694fae0
--- /dev/null
+++ b/Documentation/devicetree/bindings/display/bridge/ti,tmds181.yaml
@@ -0,0 +1,150 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/display/bridge/ti,tmds181.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: TMDS181 and SN65DP159 HDMI retimer/redriver chips
+
+maintainers:
+ - Mike Looijmans <mike.looijmans@...ic.nl>
+
+description: |
+ Texas Instruments TMDS181 and SN65DP159 retimer and redriver chips.
+ https://www.ti.com/product/TMDS181
+ https://www.ti.com/product/SN65DP159
+
+properties:
+ compatible:
+ enum:
+ - ti,tmds181
+ - ti,sn65dp159
+
+ reg:
+ enum:
+ - 0x5b
+ - 0x5c
+ - 0x5d
+ - 0x5e
+
+ oe-gpios:
+ maxItems: 1
+ description: GPIO specifier for OE pin (active high).
+
+ vdd-supply:
+ description: Core power supply, 1.1V
+
+ vcc-supply:
+ description: IO power supply, 3.3V
+
+ ports:
+ $ref: /schemas/graph.yaml#/properties/ports
+
+ properties:
+ port@0:
+ $ref: /schemas/graph.yaml#/$defs/port-base
+ unevaluatedProperties: false
+ description: Video port for HDMI (ish) input
+
+ properties:
+ endpoint:
+ $ref: /schemas/media/video-interfaces.yaml#
+ unevaluatedProperties: false
+
+ port@1:
+ $ref: /schemas/graph.yaml#/$defs/port-base
+ unevaluatedProperties: false
+ description: Video port for HDMI output (panel or bridge)
+
+ properties:
+ endpoint:
+ $ref: /schemas/media/video-interfaces.yaml#
+ unevaluatedProperties: false
+
+ required:
+ - port@0
+ - port@1
+
+ ti,source-mode:
+ type: boolean
+ description:
+ Force chip to operate in "source" mode. Allows to use
+ a TMDS181 chip (which defaults to sink) as cable driver.
+
+ ti,sink-mode:
+ type: boolean
+ description:
+ Force chip to operate in "sink" mode. Allows to use
+ a DP159 chip (defaults to source) for incoming signals.
+
+ ti,retimer-threshold-hz:
+ minimum: 25000000
+ maximum: 600000000
+ default: 200000000
+ description:
+ Cross-over point. Up until this pixel clock frequency
+ the chip remains in the low-power redriver mode. Above
+ the threshold the chip should operate in retimer mode.
+
+ ti,dvi-mode:
+ type: boolean
+ description: Makes the DP159 chip operate in DVI mode.
+
+ ti,slew-rate:
+ $ref: /schemas/types.yaml#/definitions/uint32
+ minimum: 0
+ maximum: 3
+ default: 3
+ description: Set slew rate, 0 is slowest, 3 is fastest.
+
+ ti,disable-equalizer:
+ type: boolean
+ description: Disable the equalizer (to save power).
+
+ ti,adaptive-equalizer:
+ type: boolean
+ description: Set the equalizer to adaptive mode.
+
+required:
+ - compatible
+ - reg
+ - ports
+
+additionalProperties: false
+
+examples:
+ - |
+ #include <dt-bindings/gpio/gpio.h>
+
+ i2c {
+ #address-cells = <1>;
+ #size-cells = <0>;
+
+ bridge@5b {
+ compatible = "ti,sn65dp159";
+ reg = <0x5b>;
+
+ oe-gpios = <&gpio2 1 GPIO_ACTIVE_HIGH>;
+
+ ports {
+ #address-cells = <1>;
+ #size-cells = <0>;
+
+ port@0 {
+ reg = <0>;
+
+ endpoint {
+ remote-endpoint = <&encoder_out>;
+ };
+ };
+
+ port@1 {
+ reg = <1>;
+
+ endpoint {
+ remote-endpoint = <&hdmi_connector_in>;
+ };
+ };
+ };
+ };
+ };
--
2.43.0
Met vriendelijke groet / kind regards,
Mike Looijmans
System Expert
TOPIC Embedded Products B.V.
Materiaalweg 4, 5681 RJ Best
The Netherlands
T: +31 (0) 499 33 69 69
E: mike.looijmans@...ic.nl
W: www.topic.nl
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