linux-kernel - [PATCH v5 1/2] dt-bindings: reserved-memory: Introduce carved-out memory region binding

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Message-Id: <20250617-dma-buf-ecc-heap-v5-1-0abdc5863a4f@kernel.org>
Date: Tue, 17 Jun 2025 14:25:40 +0200
From: Maxime Ripard <mripard@...nel.org>
To: Rob Herring <robh@...nel.org>, Saravana Kannan <saravanak@...gle.com>, 
 Sumit Semwal <sumit.semwal@...aro.org>, 
 Benjamin Gaignard <benjamin.gaignard@...labora.com>, 
 Brian Starkey <Brian.Starkey@....com>, John Stultz <jstultz@...gle.com>, 
 "T.J. Mercier" <tjmercier@...gle.com>, 
 Christian König <christian.koenig@....com>, 
 Krzysztof Kozlowski <krzk+dt@...nel.org>, 
 Conor Dooley <conor+dt@...nel.org>
Cc: Andrew Davis <afd@...com>, Jared Kangas <jkangas@...hat.com>, 
 Mattijs Korpershoek <mkorpershoek@...nel.org>, devicetree@...r.kernel.org, 
 linux-kernel@...r.kernel.org, linux-media@...r.kernel.org, 
 dri-devel@...ts.freedesktop.org, linaro-mm-sig@...ts.linaro.org, 
 Maxime Ripard <mripard@...nel.org>
Subject: [PATCH v5 1/2] dt-bindings: reserved-memory: Introduce carved-out
 memory region binding

Some parts of the memory can be dedicated to specific purposes and
exposed as a dedicated memory allocator.

This is especially useful if that particular region has a particular
properties the rest of the memory doesn't have. For example, some
platforms have their entire RAM covered by ECC but for a small area
meant to be used by applications that don't need ECC, and its associated
overhead.

Let's introduce a binding to describe such a region and allow the OS to
create a dedicated memory allocator for it.

Signed-off-by: Maxime Ripard <mripard@...nel.org>
---
 .../bindings/reserved-memory/carved-out.yaml       | 49 ++++++++++++++++++++++
 1 file changed, 49 insertions(+)

diff --git a/Documentation/devicetree/bindings/reserved-memory/carved-out.yaml b/Documentation/devicetree/bindings/reserved-memory/carved-out.yaml
new file mode 100644
index 0000000000000000000000000000000000000000..9ab5d1ebd9ebd9111b7c064fabe1c45e752da83b
--- /dev/null
+++ b/Documentation/devicetree/bindings/reserved-memory/carved-out.yaml
@@ -0,0 +1,49 @@
+# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/reserved-memory/carved-out.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Carved-out Memory Region
+
+description: |
+  Specifies that the reserved memory region has been carved out of the
+  main memory allocator, and is intended to be used by the OS as a
+  dedicated memory allocator.
+
+maintainers:
+  - Maxime Ripard <mripard@...nel.org>
+
+properties:
+  compatible:
+    const: carved-out
+
+  reg:
+    description: region of memory that is carved out.
+
+allOf:
+  - $ref: reserved-memory.yaml
+  - not:
+      required:
+        - reusable
+  - not:
+      required:
+        - no-map
+
+required:
+  - compatible
+  - reg
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    reserved-memory {
+        #address-cells = <1>;
+        #size-cells = <1>;
+
+        memory@...40000 {
+            compatible = "carved-out";
+            reg = <0x12340000 0x00800000>;
+        };
+    };

-- 
2.49.0