linux-kernel - [PATCH 2/3] dt-bindings: mtd: Add Documentation for Airoha fixed-partitions

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Message-ID: <20240925101422.8373-3-ansuelsmth@gmail.com>
Date: Wed, 25 Sep 2024 12:13:58 +0200
From: Christian Marangi <ansuelsmth@...il.com>
To: Miquel Raynal <miquel.raynal@...tlin.com>,
	Richard Weinberger <richard@....at>,
	Vignesh Raghavendra <vigneshr@...com>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Saravana Kannan <saravanak@...gle.com>,
	Christian Marangi <ansuelsmth@...il.com>,
	Florian Fainelli <f.fainelli@...il.com>,
	Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
	Wolfram Sang <wsa+renesas@...g-engineering.com>,
	linux-mtd@...ts.infradead.org,
	devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Lorenzo Bianconi <lorenzo@...nel.org>,
	upstream@...oha.com
Subject: [PATCH 2/3] dt-bindings: mtd: Add Documentation for Airoha fixed-partitions

Add Documentation for Airoha fixed-partitions compatibles.

Airoha based SoC declare a dedicated partition at the end of the flash to
store calibration and device specific data, in addition to fixed
partitions.

The offset of this special partition is not well defined as a custom bad
block management driver is used that reserve space at the end of the flash.

This binding allows defining all fixed partitions and marking the last one
to detect the correct offset.

Signed-off-by: Christian Marangi <ansuelsmth@...il.com>
---
 .../partitions/airoha,fixed-partitions.yaml   | 80 +++++++++++++++++++
 .../bindings/mtd/partitions/partitions.yaml   |  1 +
 2 files changed, 81 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/mtd/partitions/airoha,fixed-partitions.yaml

diff --git a/Documentation/devicetree/bindings/mtd/partitions/airoha,fixed-partitions.yaml b/Documentation/devicetree/bindings/mtd/partitions/airoha,fixed-partitions.yaml
new file mode 100644
index 000000000000..a45df51065af
--- /dev/null
+++ b/Documentation/devicetree/bindings/mtd/partitions/airoha,fixed-partitions.yaml
@@ -0,0 +1,80 @@
+# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/mtd/partitions/airoha,fixed-partitions.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Airoha SoC partitioning
+
+description: |
+  Airoha based SoC declare a dedicated partition at the end of the flash to
+  store calibration and device specific data, in addition to fixed partitions.
+
+  The offset of this special partition is not well defined as a custom bad block
+  management driver is used that reserve space at the end of the flash.
+
+  This binding allows defining all fixed partitions and marking the last one to
+  detect the correct offset from the new end of the flash.
+
+maintainers:
+  - Christian Marangi <ansuelsmth@...il.com>
+
+select: false
+
+properties:
+  compatible:
+    const: airoha,fixed-partitions
+
+  "#address-cells":
+    enum: [ 1, 2 ]
+
+  "#size-cells":
+    enum: [ 1, 2 ]
+
+patternProperties:
+  "^partition@[0-9a-f]+$":
+    $ref: partition.yaml#
+    properties:
+      compatible:
+        const: airoha,dynamic-art
+    unevaluatedProperties: false
+
+required:
+  - "#address-cells"
+  - "#size-cells"
+
+additionalProperties: false
+
+examples:
+  - |
+    partitions {
+        compatible = "airoha,fixed-partitions";
+        #address-cells = <1>;
+        #size-cells = <1>;
+
+        partition@0 {
+          label = "bootloader";
+          reg = <0x00000000 0x00080000>;
+        };
+
+        partition@...00 {
+          label = "tclinux";
+          reg = <0x00080000 0x02800000>;
+        };
+
+        partition@...0000 {
+          label = "tclinux_slave";
+          reg = <0x02880000 0x02800000>;
+        };
+
+        partition@...0000 {
+          label = "rootfs_data";
+          reg = <0x5080000 0x00800000>;
+        };
+
+        partition@...fffff {
+          compatible = "airoha,dynamic-art";
+          label = "art";
+          reg = <0xffffffff 0x00300000>;
+        };
+    };
diff --git a/Documentation/devicetree/bindings/mtd/partitions/partitions.yaml b/Documentation/devicetree/bindings/mtd/partitions/partitions.yaml
index 1dda2c80747b..ec254e03adf0 100644
--- a/Documentation/devicetree/bindings/mtd/partitions/partitions.yaml
+++ b/Documentation/devicetree/bindings/mtd/partitions/partitions.yaml
@@ -14,6 +14,7 @@ maintainers:
   - Miquel Raynal <miquel.raynal@...tlin.com>
 
 oneOf:
+  - $ref: airoha,fixed-partitions.yaml
   - $ref: arm,arm-firmware-suite.yaml
   - $ref: brcm,bcm4908-partitions.yaml
   - $ref: brcm,bcm947xx-cfe-partitions.yaml
-- 
2.45.2