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[194.187.74.233]) by smtp.gmail.com with ESMTPSA id p6-20020ac246c6000000b0049e9122bd0esm3021950lfo.114.2022.10.20.23.00.54 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 20 Oct 2022 23:00:55 -0700 (PDT) From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= To: Miquel Raynal , Richard Weinberger , Vignesh Raghavendra , Rob Herring , Krzysztof Kozlowski Cc: Mikhail Zhilkin , Christian Marangi , Wolfram Sang , Chaitanya Kulkarni , "Martin K . Petersen" , Jens Axboe , Andrew Morton , linux-mtd@lists.infradead.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= Subject: [PATCH V2 1/2] dt-bindings: mtd: partitions: support marking rootfs partition Date: Fri, 21 Oct 2022 08:00:50 +0200 Message-Id: <20221021060051.2508-1-zajec5@gmail.com> X-Mailer: git-send-email 2.34.1 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Rafał Miłecki Linux needs to know what to use as root device. On embedded devices with flash the only common way to specify that is cmdline & root= parameter. That solution works with U-Boot which is Linux & cmdline aware but isn't available with all market bootloaders. Also that method is fragile: 1. Requires specific probing order on multi-flash devices 2. Uses hardcoded partitions indexes A lot of devices use different partitioning methods. It may be "fixed-partitions" or some dynamic partitioning (e.g. based on parts table). For such cases allow "linux,rootfs" property to mark correct flash partition. Signed-off-by: Rafał Miłecki --- V2: Use "linux,rootfs" as more accurate. Thanks Rob. --- .../devicetree/bindings/mtd/partitions/fixed-partitions.yaml | 1 + .../devicetree/bindings/mtd/partitions/partition.yaml | 4 ++++ 2 files changed, 5 insertions(+) diff --git a/Documentation/devicetree/bindings/mtd/partitions/fixed-partitions.yaml b/Documentation/devicetree/bindings/mtd/partitions/fixed-partitions.yaml index ad3ccd250802..d66a6e3bcb56 100644 --- a/Documentation/devicetree/bindings/mtd/partitions/fixed-partitions.yaml +++ b/Documentation/devicetree/bindings/mtd/partitions/fixed-partitions.yaml @@ -84,6 +84,7 @@ examples: partition@0 { label = "filesystem"; reg = <0x00000000 0x1 0x00000000>; + linux,rootfs; }; }; diff --git a/Documentation/devicetree/bindings/mtd/partitions/partition.yaml b/Documentation/devicetree/bindings/mtd/partitions/partition.yaml index f1a02d840b12..a25cd23a34c0 100644 --- a/Documentation/devicetree/bindings/mtd/partitions/partition.yaml +++ b/Documentation/devicetree/bindings/mtd/partitions/partition.yaml @@ -52,6 +52,10 @@ properties: immune to paired-pages corruptions type: boolean + linux,rootfs: + description: Marks partition that contains root filesystem to mount and boot + user space from + if: not: required: [ reg ] -- 2.34.1 From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id B191EC4332F for ; Fri, 21 Oct 2022 06:01:13 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:Message-Id:Date:Subject:Cc :To:From:Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:In-Reply-To:References: List-Owner; bh=374hRwSmZkevQ4AI0K6sO5+2PGRce7OZqN6zJqlIYPU=; b=0/o9FzIaCKzahV nr7s+3IFA2mBHG0m3Kiw9LQ5FDM7x82emgOG3sIpyp2Ze4jILaJybmzIbYU8+UO2R0szwloujCzQu nzrNl4CuXocIpI2LkiBNQhD02924jyZG3qyy2cJtMYt59oZDKYDoJbLi9H9SsVzM+Di9ghYGTSpKC OuamH5sElcIg7LbjMnN3vMYeB7rTDmmTnSYNhRh+kqCheSLsVVBT5T8DrCLnJTIY+Cb+ZtJBgTZ6z sIEWf/MrW90lRtfKDgIrrQJVt5ETuUNsJtMUXGBLr76jwwRl+7LarJ+SqGLsEbSb24bZF4s/up07K qIMux9mFNdvKe6SSRcZg==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1oll5d-005YdL-Nd; Fri, 21 Oct 2022 06:01:05 +0000 Received: from mail-lf1-x130.google.com ([2a00:1450:4864:20::130]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1oll5Y-005YaZ-Ro for linux-mtd@lists.infradead.org; Fri, 21 Oct 2022 06:01:02 +0000 Received: by mail-lf1-x130.google.com with SMTP id a29so3386534lfo.1 for ; Thu, 20 Oct 2022 23:00:57 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:from:to:cc:subject:date:message-id:reply-to; bh=C5hHs2S/RQl/JXIwHudGm/5mav5RsuOJ5skKbHJaT7M=; b=OYP1l1n6nvRFKN66YMNkW/ZD0biklmoqW7/GKmlBQ/5ENQhPpcHwgnW/rNIUjRoyeq mUi4KXWRSDufdZ1cvTW+/XnGUEaYLFilpxFrjNlzxEDxCFeoa4hoLVhGgnokrL4GUPet uKYNILHU9QWMrCKkaYtUezb0B7qpROKi1T0G3/hNigGE37igbdbYuW2uvo4prBisHInc RUEzuiYlVyFbUVo4KlAGbb6R/AWWoEOYu7HdZU0ekJPUOU2oH4HXT/NQl7KkNx7KZB/t L3IccSVZ1ulaB+TjsnFK+9dkyAMqV/YBwlFRErIyCwwNXGnUijQlIUCwJg60u7yjz9E8 xS7Q== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to; bh=C5hHs2S/RQl/JXIwHudGm/5mav5RsuOJ5skKbHJaT7M=; b=JS8XY8EzCxTZTKZcZQyiGzFf5LZ25Bl4ZarcoXIjvKcGeY6XIWtUB6VUj8wnox6ivo vTVyxPMjtYrPLteEiwpxSrK+jPNjsvmdI/JgzBpNqxiWcHV/od1EMicd6B8q1iq7HyHW MnDs6lVTuLwqs+C7FlNJ9akbR+VCphv+il5yYA2y01buWrQX5iOCUl/o7JMWEjnDbCqq mI5I4uuC5Ry97hz/JZCrmiKNdF5HOmfmPcbKziByF9cvOC02MKW03GW17ZOTLlJGCvyP eOMz/Jxe943DYRx43ASi0KQtATOSz/BaAF4vve4YBKvCoy6oQdC5/evXF2oMenMlqi5M nxMA== X-Gm-Message-State: ACrzQf23ZLzMu5T5R/qzm2lXLCIVohqbyEN19RWqph0EX1Up1BdD8s3w DPt8KY1SNeBViRr4nldmU/c= X-Google-Smtp-Source: AMsMyM6WDH7wq1u5kd3U+odFfEpgQ30j9+6ajofiuy78KRWiVD1E3qXL80lU1+kvXFHzYz3QOVAQIg== X-Received: by 2002:ac2:5321:0:b0:4a4:3c25:dbd with SMTP id f1-20020ac25321000000b004a43c250dbdmr5837748lfh.406.1666332056154; Thu, 20 Oct 2022 23:00:56 -0700 (PDT) Received: from localhost.lan (ip-194-187-74-233.konfederacka.maverick.com.pl. 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