From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 3862A355F27; Thu, 26 Feb 2026 18:13:23 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1772129603; cv=none; b=liCrp8f9YLYRoGtixkbut+Ui9c6VwJtLRuxZeXq3Ze6EYrYmCdsP8tkgWUwvmnlIgZjVyBct/7oyE9ay/RUmjFIVt7vpfi/uRAZ/AO/noGDGY9AklF1YR5laSy8nEYo7IbSJzXXSfGkgcEbdE24j61jsJtutxudjqYmT+IxbuQE= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1772129603; c=relaxed/simple; bh=z7QUpP5BoSrkNlPXr+OPzldtcWq+DmCCG0w7S6dfZyE=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=KjmYGC9doBQnYRcDIPIaN6M4z0phjB71vrLv5WqijN28lZ2JKZuKTchLwbF6FTvjJ30eLW1qLe7VgtSNwfIwCg1oATr0Cb4AJ+29yLSCRW+xz0hzM6ZTSvk22IGzKWR6nv75p8apcEzbsPH8NRc87jEoowhehotvRrrAMeVjLBo= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=FyIUZ6Ok; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="FyIUZ6Ok" Received: by smtp.kernel.org (Postfix) with ESMTPSA id D8B62C116C6; Thu, 26 Feb 2026 18:13:20 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1772129603; bh=z7QUpP5BoSrkNlPXr+OPzldtcWq+DmCCG0w7S6dfZyE=; h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=FyIUZ6OkCp9e8qstFoPNzCzaYhptRwB07NsYZ6KjWuCXwZkPGqpY+2mDcqxd9CAg9 YN0DiJ1c4hJPpy1hU2a/YWSynvF79SfcKWaTTcCpWGyl6YZZAH+zZS5FLYwvInQQ1O aqFLYUf6O1iopuxxz1Ob+IvpnX2kL23I9H/GyZa5T/YKvVZyPULgpLk+8FPy47EpUx as2n/B8AZ2QHrHtW40CuqryB4b/i0C1xJSQecxmRTv40gPYP14tIpK7Hd3y+P71XtW 6cFNn1znK73lc/6klr67LAf8EIkWQnEv7KZMuLDg/wcVgRRDi9XBMiB3kcQckt+/Kn 09gLJpctjvhJQ== Message-ID: Date: Thu, 26 Feb 2026 19:13:19 +0100 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 1/7] dt-bindings: soc: st: document the RISAB firewall peripheral To: Gatien CHEVALLIER , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Maxime Coquelin , Alexandre Torgue Cc: devicetree@vger.kernel.org, linux-stm32@st-md-mailman.stormreply.com, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org References: <20260209-stm32_risab-v1-0-ef0b2b6a7e0a@foss.st.com> <20260209-stm32_risab-v1-1-ef0b2b6a7e0a@foss.st.com> <516036b6-b825-4a29-a48a-5d3af3234968@foss.st.com> <66ecf6a5-cc1f-4872-971d-6bc32894dbac@foss.st.com> From: Krzysztof Kozlowski Content-Language: en-US Autocrypt: addr=krzk@kernel.org; keydata= xsFNBFVDQq4BEAC6KeLOfFsAvFMBsrCrJ2bCalhPv5+KQF2PS2+iwZI8BpRZoV+Bd5kWvN79 cFgcqTTuNHjAvxtUG8pQgGTHAObYs6xeYJtjUH0ZX6ndJ33FJYf5V3yXqqjcZ30FgHzJCFUu JMp7PSyMPzpUXfU12yfcRYVEMQrmplNZssmYhiTeVicuOOypWugZKVLGNm0IweVCaZ/DJDIH gNbpvVwjcKYrx85m9cBVEBUGaQP6AT7qlVCkrf50v8bofSIyVa2xmubbAwwFA1oxoOusjPIE J3iadrwpFvsZjF5uHAKS+7wHLoW9hVzOnLbX6ajk5Hf8Pb1m+VH/E8bPBNNYKkfTtypTDUCj NYcd27tjnXfG+SDs/EXNUAIRefCyvaRG7oRYF3Ec+2RgQDRnmmjCjoQNbFrJvJkFHlPeHaeS BosGY+XWKydnmsfY7SSnjAzLUGAFhLd/XDVpb1Een2XucPpKvt9ORF+48gy12FA5GduRLhQU vK4tU7ojoem/G23PcowM1CwPurC8sAVsQb9KmwTGh7rVz3ks3w/zfGBy3+WmLg++C2Wct6nM Pd8/6CBVjEWqD06/RjI2AnjIq5fSEH/BIfXXfC68nMp9BZoy3So4ZsbOlBmtAPvMYX6U8VwD TNeBxJu5Ex0Izf1NV9CzC3nNaFUYOY8KfN01X5SExAoVTr09ewARAQABzSVLcnp5c3p0b2Yg S296bG93c2tpIDxrcnprQGtlcm5lbC5vcmc+wsGVBBMBCgA/AhsDBgsJCAcDAgYVCAIJCgsE FgIDAQIeAQIXgBYhBJvQfg4MUfjVlne3VBuTQ307QWKbBQJoF1BKBQkWlnSaAAoJEBuTQ307 QWKbHukP/3t4tRp/bvDnxJfmNdNVn0gv9ep3L39IntPalBFwRKytqeQkzAju0whYWg+R/rwp +r2I1Fzwt7+PTjsnMFlh1AZxGDmP5MFkzVsMnfX1lGiXhYSOMP97XL6R1QSXxaWOpGNCDaUl ajorB0lJDcC0q3xAdwzRConxYVhlgmTrRiD8oLlSCD5baEAt5Zw17UTNDnDGmZQKR0fqLpWy 786Lm5OScb7DjEgcA2PRm17st4UQ1kF0rQHokVaotxRM74PPDB8bCsunlghJl1DRK9s1aSuN hL1Pv9VD8b4dFNvCo7b4hfAANPU67W40AaaGZ3UAfmw+1MYyo4QuAZGKzaP2ukbdCD/DYnqi tJy88XqWtyb4UQWKNoQqGKzlYXdKsldYqrLHGoMvj1UN9XcRtXHST/IaLn72o7j7/h/Ac5EL 8lSUVIG4TYn59NyxxAXa07Wi6zjVL1U11fTnFmE29ALYQEXKBI3KUO1A3p4sQWzU7uRmbuxn naUmm8RbpMcOfa9JjlXCLmQ5IP7Rr5tYZUCkZz08LIfF8UMXwH7OOEX87Y++EkAB+pzKZNNd hwoXulTAgjSy+OiaLtuCys9VdXLZ3Zy314azaCU3BoWgaMV0eAW/+gprWMXQM1lrlzvwlD/k whyy9wGf0AEPpLssLVt9VVxNjo6BIkt6d1pMg6mHsUEVzsFNBFVDXDQBEADNkrQYSREUL4D3 Gws46JEoZ9HEQOKtkrwjrzlw/tCmqVzERRPvz2Xg8n7+HRCrgqnodIYoUh5WsU84N03KlLue MNsWLJBvBaubYN4JuJIdRr4dS4oyF1/fQAQPHh8Thpiz0SAZFx6iWKB7Qrz3OrGCjTPcW6ei OMheesVS5hxietSmlin+SilmIAPZHx7n242u6kdHOh+/SyLImKn/dh9RzatVpUKbv34eP1wA GldWsRxbf3WP9pFNObSzI/Bo3kA89Xx2rO2roC+Gq4LeHvo7ptzcLcrqaHUAcZ3CgFG88CnA 6z6lBZn0WyewEcPOPdcUB2Q7D/NiUY+HDiV99rAYPJztjeTrBSTnHeSBPb+qn5ZZGQwIdUW9 YegxWKvXXHTwB5eMzo/RB6vffwqcnHDoe0q7VgzRRZJwpi6aMIXLfeWZ5Wrwaw2zldFuO4Dt 91pFzBSOIpeMtfgb/Pfe/a1WJ/GgaIRIBE+NUqckM+3zJHGmVPqJP/h2Iwv6nw8U+7Yyl6gU BLHFTg2hYnLFJI4Xjg+AX1hHFVKmvl3VBHIsBv0oDcsQWXqY+NaFahT0lRPjYtrTa1v3tem/ JoFzZ4B0p27K+qQCF2R96hVvuEyjzBmdq2esyE6zIqftdo4MOJho8uctOiWbwNNq2U9pPWmu 4vXVFBYIGmpyNPYzRm0QPwARAQABwsF8BBgBCgAmAhsMFiEEm9B+DgxR+NWWd7dUG5NDfTtB YpsFAmgXUF8FCRaWWyoACgkQG5NDfTtBYptO0w//dlXJs5/42hAXKsk+PDg3wyEFb4NpyA1v qmx7SfAzk9Hf6lWwU1O6AbqNMbh6PjEwadKUk1m04S7EjdQLsj/MBSgoQtCT3MDmWUUtHZd5 RYIPnPq3WVB47GtuO6/u375tsxhtf7vt95QSYJwCB+ZUgo4T+FV4hquZ4AsRkbgavtIzQisg Dgv76tnEv3YHV8Jn9mi/Bu0FURF+5kpdMfgo1sq6RXNQ//TVf8yFgRtTUdXxW/qHjlYURrm2 H4kutobVEIxiyu6m05q3e9eZB/TaMMNVORx+1kM3j7f0rwtEYUFzY1ygQfpcMDPl7pRYoJjB dSsm0ZuzDaCwaxg2t8hqQJBzJCezTOIkjHUsWAK+tEbU4Z4SnNpCyM3fBqsgYdJxjyC/tWVT AQ18NRLtPw7tK1rdcwCl0GFQHwSwk5pDpz1NH40e6lU+NcXSeiqkDDRkHlftKPV/dV+lQXiu jWt87ecuHlpL3uuQ0ZZNWqHgZoQLXoqC2ZV5KrtKWb/jyiFX/sxSrodALf0zf+tfHv0FZWT2 zHjUqd0t4njD/UOsuIMOQn4Ig0SdivYPfZukb5cdasKJukG1NOpbW7yRNivaCnfZz6dTawXw XRIV/KDsHQiyVxKvN73bThKhONkcX2LWuD928tAR6XMM2G5ovxLe09vuOzzfTWQDsm++9UKF a/A= In-Reply-To: Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit On 19/02/2026 15:02, Gatien CHEVALLIER wrote: > Just a small reintroduction of the issue: > We need to provide three sets of information to the drivers of RISAx: > - The registers of the RISAx device, handled through property "reg" > - The global range of memory addresses protected by the RISAx devices > (currently through the custom property "st,mem-map") > - Each individual memory range protected, handled through property > "memory-region" that points to children of "/reserved-memory". Memory > regions may not cover the whole range covered by the RISAx. > > To replace the custom property, I have explored a few ways: > > 1) Describe the memory range covered by the memory firewall as a > reserved memory: Cannot be done because, for the memory firewall > covering the DDR, the reserved memory would overlap with the memory > node used to describe the memory available for regular kernel use. > The memory node represents part of the DDR in that case. But isn't this the entire point of RISAB on main system memory? You want to mark part of system memory one way or another. And now you say that overlapping would be a problem. You do understand you do not have to reserve the memory, right? You are doing only your specific mapping for that region. > > memory@80000000 { > device_type = "memory"; > reg = <0x0 0x80000000 0x1 0x0>; > }; > > reserved-memory { > #address-cells = <2>; > #size-cells = <2>; > ranges; > > risaf_range: risaf-range@80000000 { There is no compatible here... > reg = <0x0 0x80000000 0x0 0x80000000>; > no-map; And why no-mapping? Isn't the point of the block is to have it as main system memory? > }; > } > Best regards, Krzysztof