linux-kernel - [PATCH 1/4] dt-bindings: display: ti,am65x-dss: Add clk property for data edge synchronization

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Message-Id: <20250730-fix-edge-handling-v1-1-1bdfb3fe7922@bootlin.com>
Date: Wed, 30 Jul 2025 19:02:44 +0200
From: Louis Chauvet <louis.chauvet@...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>, Sam Ravnborg <sam@...nborg.org>, 
 Benoit Parrot <bparrot@...com>, Lee Jones <lee@...nel.org>, 
 Nishanth Menon <nm@...com>, Vignesh Raghavendra <vigneshr@...com>, 
 Tero Kristo <kristo@...nel.org>
Cc: thomas.petazzoni@...tlin.com, Jyri Sarha <jsarha@...com>, 
 Tomi Valkeinen <tomi.valkeinen@...com>, dri-devel@...ts.freedesktop.org, 
 devicetree@...r.kernel.org, linux-kernel@...r.kernel.org, 
 linux-arm-kernel@...ts.infradead.org, stable@...r.kernel.org, 
 Louis Chauvet <louis.chauvet@...tlin.com>
Subject: [PATCH 1/4] dt-bindings: display: ti,am65x-dss: Add clk property
 for data edge synchronization

The dt-bindings for the display, specifically ti,am65x-dss, need to
include a clock property for data edge synchronization. The current
implementation does not correctly apply the data edge sampling property.

To address this, synchronization of writes to two different registers is
required: one in the TIDSS IP (which is already described in the tidss
node) and one is in the Memory Mapped Control Register Modules (added by
the previous commit).

As the Memory Mapped Control Register Modules is located in a different
IP, we need to use a phandle to write values in its registers.

Fixes: 32a1795f57ee ("drm/tidss: New driver for TI Keystone platform Display SubSystem")
Signed-off-by: Louis Chauvet <louis.chauvet@...tlin.com>

---

Cc: stable@...r.kernel.org
---
 Documentation/devicetree/bindings/display/ti/ti,am65x-dss.yaml | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/Documentation/devicetree/bindings/display/ti/ti,am65x-dss.yaml b/Documentation/devicetree/bindings/display/ti/ti,am65x-dss.yaml
index 361e9cae6896c1f4d7fa1ec47a6e3a73bca2b102..b9a373b569170332f671416eb7bbc0c83f7b5ea6 100644
--- a/Documentation/devicetree/bindings/display/ti/ti,am65x-dss.yaml
+++ b/Documentation/devicetree/bindings/display/ti/ti,am65x-dss.yaml
@@ -133,6 +133,12 @@ properties:
       and OLDI_CLK_IO_CTRL registers. This property is needed for OLDI
       interface to work.
 
+  ti,clk-ctrl:
+    $ref: /schemas/types.yaml#/definitions/phandle
+    description:
+      phandle to syscon device node mapping CFG0_CLK_CTRL registers.
+      This property is needed for proper data sampling edge.
+
   max-memory-bandwidth:
     $ref: /schemas/types.yaml#/definitions/uint32
     description:

-- 
2.50.1