linux-kernel - [PATCH 0/3] MTD physmap: Adding reserved RAM support and fixing reserved

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Message-Id: <20251117-mtd-memregion-v1-0-7b35611c79a6@bootlin.com>
Date: Mon, 17 Nov 2025 18:00:13 +0100
From: Gregory CLEMENT <gregory.clement@...tlin.com>
To: Rob Herring <robh@...nel.org>, Saravana Kannan <saravanak@...gle.com>, 
 Linus Walleij <linus.walleij@...aro.org>, 
 Miquel Raynal <miquel.raynal@...tlin.com>, 
 Richard Weinberger <richard@....at>, Vignesh Raghavendra <vigneshr@...com>, 
 Krzysztof Kozlowski <krzk+dt@...nel.org>, 
 Conor Dooley <conor+dt@...nel.org>
Cc: Thomas Petazzoni <thomas.petazzoni@...tlin.com>, 
 Vladimir Kondratiev <vladimir.kondratiev@...ileye.com>, 
 Benoît Monin <benoit.monin@...tlin.com>, 
 Théo Lebrun <theo.lebrun@...tlin.com>, 
 devicetree@...r.kernel.org, linux-kernel@...r.kernel.org, 
 linux-arm-kernel@...ts.infradead.org, linux-mtd@...ts.infradead.org, 
 Gregory CLEMENT <gregory.clement@...tlin.com>
Subject: [PATCH 0/3] MTD physmap: Adding reserved RAM support and fixing
 reserved_mem limitations

Hello,

While working on adding reserved RAM support to the MTD physmap
driver, I encountered a limitation in the kernel's reserved memory
support: although the Device Tree specification allows multiple reg
entries for a memory-region node, the kernel only processed the first
one. This limitation prevented proper support for reserved RAM regions
in MTD.

This series addresses both issues:

First, the reserved memory support is extended to fully support
multiple reg entries per memory-region node, ensuring compliance with
the Device Tree specification.

Then, with this foundation in place, the series updates the MTD
physmap driver to support reserved RAM regions. The DT bindings are
extended to allow memory-region phandles for RAM access, and the
physmap driver is modified to use these regions.

Gregory

Signed-off-by: Gregory CLEMENT <gregory.clement@...tlin.com>
---
Gregory CLEMENT (3):
      of: reserved_mem: Support multiple 'reg' entries for memory-region
      dt-bindings: mtd: physmap: Allow using memory-region to access memory resources
      mtd: physmap: Add support for RAM reserved memory regions

 .../devicetree/bindings/mtd/mtd-physmap.yaml       |  59 ++++++---
 drivers/mtd/maps/physmap-core.c                    |  56 ++++++--
 drivers/of/of_reserved_mem.c                       | 141 +++++++++++++++++++--
 include/linux/of_reserved_mem.h                    |   4 +
 4 files changed, 220 insertions(+), 40 deletions(-)
---
base-commit: b55d426c390f2a4762b2a88b113cc44c37e08e46
change-id: 20251117-mtd-memregion-8830c1dd70ce

Best regards,
-- 
Grégory CLEMENT, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com