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Subject: Re: [PATCH v6 1/3] dt-bindings: mtd: partitions: Add binman compatible Message-ID: <20240205131755.3462084f@xps-13> In-Reply-To: References: <20231116172859.393744-1-sjg@chromium.org> <20231208150042.GA1278773-robh@kernel.org> <20231214172702.GA617226-robh@kernel.org> <20240205085056.44278f2c@xps-13> Organization: Bootlin X-Mailer: Claws Mail 4.0.0 (GTK+ 3.24.33; x86_64-pc-linux-gnu) MIME-Version: 1.0 X-GND-Sasl: miquel.raynal@bootlin.com X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20240205_041800_434182_65DF9D69 X-CRM114-Status: GOOD ( 40.34 ) X-BeenThere: linux-mtd@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: Linux MTD discussion mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Sender: "linux-mtd" Errors-To: linux-mtd-bounces+linux-mtd=archiver.kernel.org@lists.infradead.org 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(CET) Authentication-Results: phobos.denx.de; dmarc=pass (p=reject dis=none) header.from=bootlin.com Authentication-Results: phobos.denx.de; spf=pass smtp.mailfrom=miquel.raynal@bootlin.com Received: by mail.gandi.net (Postfix) with ESMTPSA id 52612240002; Mon, 5 Feb 2024 12:17:56 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bootlin.com; s=gm1; t=1707135477; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=y+evZiLiKD7b5CexFbHLoJ/nJKE/+uE1gXiR+q3+Wjw=; b=BnEbuHmrgDWYV4Zwx4pHhHb3Ef7KcMKvOrrZ3+iq0AlT6UzxQe6TSa5R+imYuJy+U2bXIU a+QR5CQQc6wC3mNcshL90wOLjj9XtlN/9ES/waKZElJwZmkMK3wbSyFpi0iF3RFaYeI0c7 3qHtNNtiOVMvIfRHQFVm8m+A378FLmy2D7C/hVAIujzXfWkJaojaMCzCMATuwLF4bGvxHF 3tcSOVVUN47ZwjomCKVhHj4/GtFvlbgMzOh7AT+jic5X2ZO7o52QWvFjOlSmH5PXhhjp/Q Urp2dzCUeAdb4lpNuvf5W6ncJCEARN691Mmkn8ydX0tWH4RVvG1sQ4szSJBLtQ== Date: Mon, 5 Feb 2024 13:17:55 +0100 From: Miquel Raynal To: Simon Glass Cc: Rob Herring , devicetree@vger.kernel.org, linux-mtd@lists.infradead.org, Tom Rini , Michael Walle , U-Boot Mailing List , Conor Dooley , Krzysztof Kozlowski , Pratyush Yadav , =?UTF-8?B?UmFmYcWCIE1pxYJlY2tp?= , Richard Weinberger , Vignesh Raghavendra , linux-kernel@vger.kernel.org Subject: Re: [PATCH v6 1/3] dt-bindings: mtd: partitions: Add binman compatible Message-ID: <20240205131755.3462084f@xps-13> In-Reply-To: References: <20231116172859.393744-1-sjg@chromium.org> <20231208150042.GA1278773-robh@kernel.org> <20231214172702.GA617226-robh@kernel.org> <20240205085056.44278f2c@xps-13> Organization: Bootlin X-Mailer: Claws Mail 4.0.0 (GTK+ 3.24.33; x86_64-pc-linux-gnu) MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable X-GND-Sasl: miquel.raynal@bootlin.com X-BeenThere: u-boot@lists.denx.de X-Mailman-Version: 2.1.39 Precedence: list List-Id: U-Boot discussion List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: u-boot-bounces@lists.denx.de Sender: "U-Boot" X-Virus-Scanned: clamav-milter 0.103.8 at phobos.denx.de X-Virus-Status: Clean Hi Simon, > > > > > > > > > > > > +description: | > > > > > > > > > > > > + The binman node provides a layout for firmware, = used when packaging firmware > > > > > > > > > > > > + from multiple projects. It is based on fixed-par= titions, with some > > > > > > > > > > > > + extensions, but uses 'compatible' to indicate th= e contents of the node, to > > > > > > > > > > > > + avoid perturbing or confusing existing installat= ions which use 'label' for a > > > > > > > > > > > > + particular purpose. > > > > > > > > > > > > + > > > > > > > > > > > > + Binman supports properties used as inputs to the= firmware-packaging process, > > > > > > > > > > > > + such as those which control alignment of partiti= ons. This binding addresses > > > > > > > > > > > > + these 'input' properties. For example, it is com= mon for the 'reg' property > > > > > > > > > > > > + (an 'output' property) to be set by Binman, base= d on the alignment requested > > > > > > > > > > > > + in the input. > > > > > > > > > > > > + > > > > > > > > > > > > + Once processing is complete, input properties ha= ve mostly served their > > > > > > > > > > > > + purpose, at least until the firmware is repacked= later, e.g. due to a > > > > > > > > > > > > + firmware update. The 'fixed-partitions' binding = should provide enough > > > > > > > > > > > > + information to read the firmware at runtime, inc= luding decompression if > > > > > > > > > > > > + needed. =20 > > > > > > > > > > > > > > > > > > > > > > How is this going to work exactly? binman reads these= nodes and then > > > > > > > > > > > writes out 'fixed-partitions' nodes. But then you've = lost the binman > > > > > > > > > > > specifc parts needed for repacking. =20 > > > > > > > > > > > > > > > > > > > > No, they are the same node. I do want the extra informa= tion to stick > > > > > > > > > > around. So long as it is compatible with fixed-partitio= n as well, this > > > > > > > > > > should work OK. =20 > > > > > > > > > > > > > > > > > > How can it be both? The partitions node compatible can be= either > > > > > > > > > 'fixed-partitions' or 'binman'. =20 > > > > > > > > > > > > > > > > Can we not allow it to be both? I have tried to adjust thin= gs in > > > > > > > > response to feedback but perhaps the feedback was leading m= e down the > > > > > > > > wrong path? =20 > > > > > > > > > > > > > > Sure, but then the schema has to and that means extending > > > > > > > fixed-partitions. =20 > > > > > > > > > > > > Can we cross that bridge later? There might be resistance to it= . I'm > > > > > > not sure. For now, perhaps just a binman compatible works well = enough > > > > > > to make progress. =20 > > > > > > > > > > Is there any way to make progress on this? I would like to have > > > > > software which doesn't understand the binman compatible to at lea= st be > > > > > able to understand the fixed-partition compatible. Is that accept= able? =20 > > > > > > > > There's only 2 ways that it can work. Either binman writes out > > > > fixed-partition nodes dropping/replacing anything only defined for > > > > binman or fixed-partition is extended to include what binman needs.= =20 > > > > > > OK, then I suppose the best way is to add a new binman compatible, as > > > is done with this v6 series. People then need to choose it instead of > > > fixed-partition. =20 > > > > I'm sorry this is not at all what Rob suggested, or did I totally > > misunderstand his answer? > > > > In both cases the solution is to generate a "fixed-partition" node. Now > > up to you to decide whether binman should adapt the output to the > > current schema, or if the current schema should be extended to > > understand all binman's output. > > > > At least that is my understanding and also what I kind of agree with. = =20 >=20 > I do want to binman schema to include all the features of Binman. >=20 > So are you saying that there should not be a 'binman' schema, but I > should just add all the binman properties to the fixed-partition > schema? This is my current understanding, yes. But acknowledgment from Rob is also welcome. Thanks, Miqu=C3=A8l