Allow parsing GPT layouts on MTD devices.

Signed-off-by: Romain Gantois <romain.gantois@bootlin.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@bootlin.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

On Mon, 11 Dec 2023 16:12:42 +0100, Romain Gantois wrote:
> Allow parsing GPT layouts on MTD devices.
> 
> Signed-off-by: Romain Gantois <romain.gantois@bootlin.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
> 

My bot found errors running 'make DT_CHECKER_FLAGS=-m dt_binding_check'
on your patch (DT_CHECKER_FLAGS is new in v5.13):

yamllint warnings/errors:
./Documentation/devicetree/bindings/mtd/partitions/gpt.yaml:11:1: [error] syntax error: could not find expected ':' (syntax)

dtschema/dtc warnings/errors:
make[2]: *** Deleting file 'Documentation/devicetree/bindings/mtd/partitions/gpt.example.dts'
Documentation/devicetree/bindings/mtd/partitions/gpt.yaml:11:1: could not find expected ':'
make[2]: *** [Documentation/devicetree/bindings/Makefile:26: Documentation/devicetree/bindings/mtd/partitions/gpt.example.dts] Error 1
make[2]: *** Waiting for unfinished jobs....
/builds/robherring/dt-review-ci/linux/Documentation/devicetree/bindings/mtd/partitions/partitions.yaml:
while scanning a simple key
  in "<unicode string>", line 10, column 1
could not find expected ':'
  in "<unicode string>", line 11, column 1
./Documentation/devicetree/bindings/mtd/partitions/gpt.yaml:11:1: could not find expected ':'
/builds/robherring/dt-review-ci/linux/Documentation/devicetree/bindings/mtd/partitions/gpt.yaml: ignoring, error parsing file
make[1]: *** [/builds/robherring/dt-review-ci/linux/Makefile:1424: dt_binding_check] Error 2
make: *** [Makefile:234: __sub-make] Error 2

doc reference errors (make refcheckdocs):

See https://patchwork.ozlabs.org/project/devicetree-bindings/patch/20231211151244.289349-7-romain.gantois@bootlin.com

The base for the series is generally the latest rc1. A different dependency
should be noted in *this* patch.

If you already ran 'make dt_binding_check' and didn't see the above
error(s), then make sure 'yamllint' is installed and dt-schema is up to
date:

pip3 install dtschema --upgrade

Please check and re-submit after running the above command yourself. Note
that DT_SCHEMA_FILES can be set to your schema file to speed up checking
your schema. However, it must be unset to test all examples with your schema.