linux-kernel - [PATCH v2 1/3] dt-bindings: display: ti,am65x-dss: Add am62p dss compatible

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Message-ID: <20251125165942.2586341-2-s-jain1@ti.com>
Date: Tue, 25 Nov 2025 22:29:40 +0530
From: Swamil Jain <s-jain1@...com>
To: <jyri.sarha@....fi>, <tomi.valkeinen@...asonboard.com>,
	<airlied@...il.com>, <simona@...ll.ch>, <maarten.lankhorst@...ux.intel.com>,
	<mripard@...nel.org>, <tzimmermann@...e.de>, <robh@...nel.org>,
	<krzk+dt@...nel.org>, <conor+dt@...nel.org>, <aradhya.bhatia@...ux.dev>
CC: <dri-devel@...ts.freedesktop.org>, <devicetree@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, <devarsht@...com>, <praneeth@...com>,
	<h-shenoy@...com>, <u-kumar1@...com>, <s-jain1@...com>
Subject: [PATCH v2 1/3] dt-bindings: display: ti,am65x-dss: Add am62p dss compatible

TI's AM62P SoC contains two instances of the TI Keystone Display
SubSystem (DSS), each with two video ports and two video planes. These
instances support up to three independent video streams through OLDI,
DPI, and DSI interfaces.

DSS0 (first instance) supports:
 - Two OLDI transmitters on video port 1, configurable in dual-link or
   single-link mode.
 - DPI output on video port 2.

DSS1 (second instance) supports:
 - One OLDI transmitter on video port 1 (single-link mode only).
 - DSI controller output on video port 2.

The two OLDI transmitters can be configured in clone mode to drive a
pair of identical OLDI single-link displays. DPI outputs from
DSS0 VP2, DSS1 VP1, and DSS1 VP2 are multiplexed, allowing only one
DPI output at a time.

Add the compatible string "ti,am62p-dss" and update related
description accordingly.

AM62P has different power domains for DSS and OLDI compared to other
Keystone SoCs. Therefore, add 'minItems' and set to 1 and 'maxItems'
field in the power-domains property to 3 for the "ti,am62p-dss"
compatible entry to reflect this hardware difference.

Signed-off-by: Swamil Jain <s-jain1@...com>
---
 .../bindings/display/ti/ti,am65x-dss.yaml     | 25 +++++++++++++++++++
 1 file changed, 25 insertions(+)

diff --git a/Documentation/devicetree/bindings/display/ti/ti,am65x-dss.yaml b/Documentation/devicetree/bindings/display/ti/ti,am65x-dss.yaml
index 361e9cae6896..3945ae048b8f 100644
--- a/Documentation/devicetree/bindings/display/ti/ti,am65x-dss.yaml
+++ b/Documentation/devicetree/bindings/display/ti/ti,am65x-dss.yaml
@@ -24,6 +24,19 @@ description: |
   DPI signals are also routed internally to DSI Tx controller present within the
   SoC. Due to clocking limitations only one of the interface i.e. either DSI or
   DPI can be used at once.
+  The AM62P has two instances of TI Keystone Display SubSystem, each with two
+  video ports and two video planes. These instances can support up to 3
+  independent video streams through OLDI, DPI, and DSI interfaces.
+  DSS0 (first instance) supports:
+    - Two OLDI TXes on video port 1, configurable in dual-link or
+      single link clone mode
+    - DPI output on video port 2
+  DSS1 (second instance) supports:
+    - One OLDI TX on video port 1 (single-link mode only)
+    - DSI controller output on video port 2
+  The two OLDI TXes can be configured in clone mode to drive a pair of
+  identical OLDI single-link displays. DPI outputs from DSS0 VP2, DSS1 VP1,
+  and DSS1 VP2 are muxed, allowing only one DPI output at a time.
 
 properties:
   compatible:
@@ -31,6 +44,7 @@ properties:
       - ti,am625-dss
       - ti,am62a7-dss
       - ti,am62l-dss
+      - ti,am62p-dss
       - ti,am65x-dss
 
   reg:
@@ -197,6 +211,17 @@ allOf:
               properties:
                 endpoint@1: false
 
+  - if:
+      properties:
+        compatible:
+          contains:
+            const: ti,am62p-dss
+    then:
+      properties:
+        power-domains:
+          minItems: 1
+          maxItems: 3
+
 required:
   - compatible
   - reg