linux-kernel - [RESEND PATCH v2 1/5] dt-bindings: display: ti,am65x-dss: Add clk property for data edge synchronization

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Message-ID: <20251106141227.899054-2-s-jain1@ti.com>
Date: Thu, 6 Nov 2025 19:42:23 +0530
From: Swamil Jain <s-jain1@...com>
To: <jyri.sarha@....fi>, <tomi.valkeinen@...asonboard.com>,
	<maarten.lankhorst@...ux.intel.com>, <mripard@...nel.org>,
	<tzimmermann@...e.de>, <airlied@...il.com>, <simona@...ll.ch>, <nm@...com>,
	<vigneshr@...com>, <kristo@...nel.org>, <robh@...nel.org>,
	<krzk+dt@...nel.org>, <conor+dt@...nel.org>, <lee@...nel.org>,
	<louis.chauvet@...tlin.com>, <aradhya.bhatia@...ux.dev>
CC: <devarsht@...com>, <praneeth@...com>, <h-shenoy@...com>,
	<dri-devel@...ts.freedesktop.org>, <linux-arm-kernel@...ts.infradead.org>,
	<devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: [RESEND PATCH v2 1/5] dt-bindings: display: ti,am65x-dss: Add clk property for data edge synchronization

From: Louis Chauvet <louis.chauvet@...tlin.com>

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.

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: ad2ac9dc9426 ("drm/tidss: Add support for AM625 DSS")
Fixes: 5cc5ea7b6d7b ("drm/tidss: Add support for AM62A7 DSS")
Cc: stable@...r.kernel.org
Signed-off-by: Louis Chauvet <louis.chauvet@...tlin.com>
Signed-off-by: Swamil Jain <s-jain1@...com>
---
 .../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 361e9cae6896..b9a373b56917 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: