linux-kernel - [RFC PATCH 6/6] dt-bindings: mtd: add GPT partition bindings

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Message-ID: <20231211151244.289349-7-romain.gantois@bootlin.com>
Date:   Mon, 11 Dec 2023 16:12:42 +0100
From:   Romain Gantois <romain.gantois@...tlin.com>
To:     Miquel Raynal <miquel.raynal@...tlin.com>,
        Richard Weinberger <richard@....at>,
        Vignesh Raghavendra <vigneshr@...com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Jens Axboe <axboe@...nel.dk>,
        Davidlohr Bueso <dave@...olabs.net>,
        Ard Biesheuvel <ardb@...nel.org>
Cc:     Romain Gantois <romain.gantois@...tlin.com>,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
        Herve Codina <herve.codina@...tlin.com>,
        linux-mtd@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-block@...r.kernel.org,
        linux-efi@...r.kernel.org
Subject: [RFC PATCH 6/6] dt-bindings: mtd: add GPT partition bindings

Allow parsing GPT layouts on MTD devices.

Signed-off-by: Romain Gantois <romain.gantois@...tlin.com>
---
 .../bindings/mtd/partitions/gpt.yaml          | 41 +++++++++++++++++++
 .../bindings/mtd/partitions/partitions.yaml   |  1 +
 2 files changed, 42 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/mtd/partitions/gpt.yaml

diff --git a/Documentation/devicetree/bindings/mtd/partitions/gpt.yaml b/Documentation/devicetree/bindings/mtd/partitions/gpt.yaml
new file mode 100644
index 000000000000..3c538562e3e5
--- /dev/null
+++ b/Documentation/devicetree/bindings/mtd/partitions/gpt.yaml
@@ -0,0 +1,41 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/mtd/partitions/gpt.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: GUID Partition Table (GPT)
+
+description: The GPT format is commonly used on block devices to describe a
+partitioning scheme. It mainly consists of a Legacy or Protective MBR for
+backwards compatibility, a primary GPT header with an array of Partition Table
+Entries, and a backup header with a backup array of PTEs. This partition table
+format can be used on MTD devices, specifically NOR flash devices, since NAND
+flashes are susceptible to bad blocks which could easily corrupt the GPT layout.
+Logical Block Addresses (LBAs) are defined to target 512-byte blocks.
+
+maintainers:
+  - Romain Gantois <romain.gantois@...tlin.com>
+
+select: false
+
+properties:
+  compatible:
+    const: gpt
+
+  '#address-cells': false
+
+  '#size-cells': false
+
+required:
+  - compatible
+
+additionalProperties: false
+
+examples:
+  - |
+    flash@0 {
+      partitions {
+        compatible = "gpt";
+      };
+    };
diff --git a/Documentation/devicetree/bindings/mtd/partitions/partitions.yaml b/Documentation/devicetree/bindings/mtd/partitions/partitions.yaml
index 1dda2c80747b..f2b1565d5d0a 100644
--- a/Documentation/devicetree/bindings/mtd/partitions/partitions.yaml
+++ b/Documentation/devicetree/bindings/mtd/partitions/partitions.yaml
@@ -18,6 +18,7 @@ oneOf:
   - $ref: brcm,bcm4908-partitions.yaml
   - $ref: brcm,bcm947xx-cfe-partitions.yaml
   - $ref: fixed-partitions.yaml
+  - $ref: gpt.yaml
   - $ref: linksys,ns-partitions.yaml
   - $ref: qcom,smem-part.yaml
   - $ref: redboot-fis.yaml
-- 
2.43.0