linux-kernel - Re: [PATCH v3 2/4] of: reserved_mem: Support multiple 'reg' entries for memory-region

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Message-ID: <20260114223140.GA3306270-robh@kernel.org>
Date: Wed, 14 Jan 2026 16:31:40 -0600
From: Rob Herring <robh@...nel.org>
To: Gregory CLEMENT <gregory.clement@...tlin.com>
Cc: 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>,
	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
Subject: Re: [PATCH v3 2/4] of: reserved_mem: Support multiple 'reg' entries
 for memory-region

On Wed, Jan 07, 2026 at 02:04:53PM +0100, Gregory CLEMENT wrote:
> The Device Tree specification allows a "memory-region" node to have
> multiple 'reg' entries, but the current kernel implementation only
> processes the first entry. This can lead to drivers not being able to
> access all the reserved memory regions specified in the Device Tree.

This may be a case of we change the spec. Or at least say, nodes 
referenced by memory-region can only have 1 region. Are there some 
existing users needing this functionality?

Rob