linux-kernel - [PATCH 1/1] of: properties of reserved-memory nodes

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Date:   Thu, 10 Sep 2020 18:20:20 +0200
From:   Heinrich Schuchardt <xypron.glpk@....de>
To:     Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>
Cc:     devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        Ard Biesheuvel <ardb@...nel.org>,
        Grant Likely <grant.likely@....com>,
        Heinrich Schuchardt <xypron.glpk@....de>
Subject: [PATCH 1/1] of: properties of reserved-memory nodes

The reusable and the no-map property are mutually exclusive.
Clarify this in the documentation.

Signed-off-by: Heinrich Schuchardt <xypron.glpk@....de>
---
 .../devicetree/bindings/reserved-memory/reserved-memory.txt    | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/Documentation/devicetree/bindings/reserved-memory/reserved-memory.txt b/Documentation/devicetree/bindings/reserved-memory/reserved-memory.txt
index bac4afa3b197..eb987203548f 100644
--- a/Documentation/devicetree/bindings/reserved-memory/reserved-memory.txt
+++ b/Documentation/devicetree/bindings/reserved-memory/reserved-memory.txt
@@ -64,6 +64,9 @@ reusable (optional) - empty property
       system can use that region to store volatile or cached data that
       can be otherwise regenerated or migrated elsewhere.

+A node must not carry both the no-map and the reusable property as these are
+logically contradictory.
+
 Linux implementation note:
 - If a "linux,cma-default" property is present, then Linux will use the
   region for the default pool of the contiguous memory allocator.
--
2.28.0