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Received-SPF: Pass (protection.outlook.com: domain of amd.com designates 165.204.84.17 as permitted sender) receiver=protection.outlook.com; client-ip=165.204.84.17; helo=SATLEXMB04.amd.com; pr=C Received: from SATLEXMB04.amd.com (165.204.84.17) by BL02EPF0001A0FC.mail.protection.outlook.com (10.167.242.103) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.20.8093.14 via Frontend Transport; Sat, 26 Oct 2024 07:54:08 +0000 Received: from SATLEXMB03.amd.com (10.181.40.144) by SATLEXMB04.amd.com (10.181.40.145) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2507.39; Sat, 26 Oct 2024 02:54:06 -0500 Received: from xhdakumarma40.xilinx.com (10.180.168.240) by SATLEXMB03.amd.com (10.181.40.144) with Microsoft SMTP Server id 15.1.2507.39 via Frontend Transport; Sat, 26 Oct 2024 02:54:01 -0500 From: Amit Kumar Mahapatra To: , , , , , , , , , CC: , , , , , , , , , , , , , , Amit Kumar Mahapatra Subject: [RFC PATCH 1/2] dt-bindings: mtd: Add bindings for describing concatinated MTD devices Date: Sat, 26 Oct 2024 13:23:46 +0530 Message-ID: <20241026075347.580858-2-amit.kumar-mahapatra@amd.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20241026075347.580858-1-amit.kumar-mahapatra@amd.com> References: <20241026075347.580858-1-amit.kumar-mahapatra@amd.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Received-SPF: None (SATLEXMB04.amd.com: amit.kumar-mahapatra@amd.com does not designate permitted sender hosts) X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: BL02EPF0001A0FC:EE_|SN7PR12MB6716:EE_ X-MS-Office365-Filtering-Correlation-Id: 0e10ef17-2616-4e47-c041-08dcf5935eec X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|376014|36860700013|7416014|1800799024|82310400026|921020; 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X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 26 Oct 2024 07:54:08.0714 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 0e10ef17-2616-4e47-c041-08dcf5935eec X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=3dd8961f-e488-4e60-8e11-a82d994e183d;Ip=[165.204.84.17];Helo=[SATLEXMB04.amd.com] X-MS-Exchange-CrossTenant-AuthSource: BL02EPF0001A0FC.namprd03.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: SN7PR12MB6716 Content-Type: text/plain; charset="utf-8" This approach was suggested by Rob [1] during a discussion on Miquel's initial approach [2] to extend the MTD-CONCAT driver to support stacked memories. Define each flash node separately with its respective partitions, and add a 'concat-parts' binding to link the partitions of the two flash nodes that need to be concatenated. flash@0 { compatible =3D "jedec,spi-nor" ... partitions { compatible =3D "fixed-partitions"; concat-partition =3D <&flash0_partition &flash1_par= tition>; flash0_partition: partition@0 { label =3D "part0_0"; reg =3D <0x0 0x800000>; } } } flash@1 { compatible =3D "jedec,spi-nor" ... partitions { compatible =3D "fixed-partitions"; concat-partition =3D <&flash0_partition &flash1_par= tition>; flash1_partition: partition@0 { label =3D "part0_1"; reg =3D <0x0 0x800000>; } } } Based on the bindings the MTD-CONCAT driver need to be updated to create virtual mtd-concat devices. [1] https://lore.kernel.org/all/20191118221341.GA30937@bogus/ [2] https://lore.kernel.org/all/20191113171505.26128-4-miquel.raynal@bootli= n.com/ Signed-off-by: Amit Kumar Mahapatra --- .../mtd/partitions/fixed-partitions.yaml | 18 ++++++++++++++++++ .../bindings/mtd/partitions/partitions.yaml | 6 ++++++ 2 files changed, 24 insertions(+) diff --git a/Documentation/devicetree/bindings/mtd/partitions/fixed-partiti= ons.yaml b/Documentation/devicetree/bindings/mtd/partitions/fixed-partition= s.yaml index 058253d6d889..df4ccb3dfeba 100644 --- a/Documentation/devicetree/bindings/mtd/partitions/fixed-partitions.yaml +++ b/Documentation/devicetree/bindings/mtd/partitions/fixed-partitions.yaml @@ -183,3 +183,21 @@ examples: read-only; }; }; + + - | + partitions { + compatible =3D "fixed-partitions"; + #address-cells =3D <1>; + #size-cells =3D <1>; + concat-parts =3D <&part0 &part1>; + + part0: partition@0 { + label =3D "flash0-part0"; + reg =3D <0x0000000 0x100000>; + }; + + part1: partition@100000 { + label =3D "flash1-part0"; + reg =3D <0x0100000 0x200000>; + }; + }; diff --git a/Documentation/devicetree/bindings/mtd/partitions/partitions.ya= ml b/Documentation/devicetree/bindings/mtd/partitions/partitions.yaml index 1dda2c80747b..86bbd83c3f6d 100644 --- a/Documentation/devicetree/bindings/mtd/partitions/partitions.yaml +++ b/Documentation/devicetree/bindings/mtd/partitions/partitions.yaml @@ -32,6 +32,12 @@ properties: '#size-cells': enum: [1, 2] =20 + concat-parts: + description: List of MTD partitions phandles that should be concatenat= ed. + $ref: /schemas/types.yaml#/definitions/phandle-array + minItems: 2 + maxItems: 4 + patternProperties: "^partition(-.+|@[0-9a-f]+)$": $ref: partition.yaml --=20 2.34.1