linux-kernel - [PATCH v4 1/2] dt-bindings: display: samsung,exynos7-decon: document iommus, memory-region, and ports

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20250706-exynosdrm-decon-v4-1-735fd215f4b3@disroot.org>
Date: Sun, 06 Jul 2025 22:59:45 +0530
From: Kaustabh Chakraborty <kauschluss@...root.org>
To: Inki Dae <inki.dae@...sung.com>, Seung-Woo Kim <sw0312.kim@...sung.com>, 
 Kyungmin Park <kyungmin.park@...sung.com>, David Airlie <airlied@...il.com>, 
 Simona Vetter <simona@...ll.ch>, Krzysztof Kozlowski <krzk@...nel.org>, 
 Alim Akhtar <alim.akhtar@...sung.com>, 
 Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>, 
 Maxime Ripard <mripard@...nel.org>, Thomas Zimmermann <tzimmermann@...e.de>, 
 Rob Herring <robh@...nel.org>, Conor Dooley <conor@...nel.org>, 
 Ajay Kumar <ajaykumar.rs@...sung.com>, Akshu Agrawal <akshua@...il.com>, 
 Krzysztof Kozlowski <krzk+dt@...nel.org>, 
 Conor Dooley <conor+dt@...nel.org>
Cc: dri-devel@...ts.freedesktop.org, linux-arm-kernel@...ts.infradead.org, 
 linux-samsung-soc@...r.kernel.org, linux-kernel@...r.kernel.org, 
 devicetree@...r.kernel.org, Kaustabh Chakraborty <kauschluss@...root.org>
Subject: [PATCH v4 1/2] dt-bindings: display: samsung,exynos7-decon:
 document iommus, memory-region, and ports

Similar to FIMD and Exynos5433's DECON, the Exynos7 DECON hardware:
- May optionally require an IOMMU to initialize a display region.
- Outputs image data to another block, say an MIC or a DSI master.

If an IOMMU is present, it may also require to access the reserved
framebuffer region.

Document these bindings in the devicetree schema.

Signed-off-by: Kaustabh Chakraborty <kauschluss@...root.org>
---
 .../display/samsung/samsung,exynos7-decon.yaml      | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

diff --git a/Documentation/devicetree/bindings/display/samsung/samsung,exynos7-decon.yaml b/Documentation/devicetree/bindings/display/samsung/samsung,exynos7-decon.yaml
index 53916e4c95d8c0369138941a556c23f5d42fbd39..14b954718008e06aa1627fcd116a61927ce29e99 100644
--- a/Documentation/devicetree/bindings/display/samsung/samsung,exynos7-decon.yaml
+++ b/Documentation/devicetree/bindings/display/samsung/samsung,exynos7-decon.yaml
@@ -80,6 +80,21 @@ properties:
       - const: vsync
       - const: lcd_sys
 
+  iommus:
+    maxItems: 1
+
+  memory-region:
+    maxItems: 1
+    description:
+      A phandle to a node describing a reserved framebuffer memory region.
+      For example, the splash memory region set up by the bootloader.
+
+  port:
+    $ref: /schemas/graph.yaml#/properties/port
+    description:
+      Output port which is connected to either a Mobile Image Compressor
+      (MIC) or a DSI Master device.
+
   power-domains:
     maxItems: 1
 
@@ -92,6 +107,7 @@ required:
   - clock-names
   - interrupts
   - interrupt-names
+  - port
   - reg
 
 additionalProperties: false
@@ -118,4 +134,9 @@ examples:
                       "decon0_vclk";
         pinctrl-0 = <&lcd_clk &pwm1_out>;
         pinctrl-names = "default";
+        port {
+            decon_to_dsi: endpoint {
+                remote-endpoint = <&dsi_to_decon>;
+            };
+        };
     };

-- 
2.49.0