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approved; emergency; loop; banned-address; member-moderation; header-match-alsa-devel.alsa-project.org-0; header-match-alsa-devel.alsa-project.org-1 Message-ID-Hash: RDPIB57RA6BPBSL7H5536CT3QTS3JWTY X-Message-ID-Hash: RDPIB57RA6BPBSL7H5536CT3QTS3JWTY X-Mailman-Approved-At: Mon, 28 Oct 2024 16:42:31 +0000 X-Mailman-Version: 3.3.9 Precedence: list List-Id: "Alsa-devel mailing list for ALSA developers - http://www.alsa-project.org" Archived-At: List-Archive: List-Help: List-Owner: List-Post: List-Subscribe: List-Unsubscribe: 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 = "jedec,spi-nor" ... partitions { compatible = "fixed-partitions"; concat-partition = <&flash0_partition &flash1_partition>; flash0_partition: partition@0 { label = "part0_0"; reg = <0x0 0x800000>; } } } flash@1 { compatible = "jedec,spi-nor" ... partitions { compatible = "fixed-partitions"; concat-partition = <&flash0_partition &flash1_partition>; flash1_partition: partition@0 { label = "part0_1"; reg = <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@bootlin.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-partitions.yaml b/Documentation/devicetree/bindings/mtd/partitions/fixed-partitions.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 = "fixed-partitions"; + #address-cells = <1>; + #size-cells = <1>; + concat-parts = <&part0 &part1>; + + part0: partition@0 { + label = "flash0-part0"; + reg = <0x0000000 0x100000>; + }; + + part1: partition@100000 { + label = "flash1-part0"; + reg = <0x0100000 0x200000>; + }; + }; diff --git a/Documentation/devicetree/bindings/mtd/partitions/partitions.yaml 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] + concat-parts: + description: List of MTD partitions phandles that should be concatenated. + $ref: /schemas/types.yaml#/definitions/phandle-array + minItems: 2 + maxItems: 4 + patternProperties: "^partition(-.+|@[0-9a-f]+)$": $ref: partition.yaml