linux-kernel - [RFC RFT PATCH v2 1/2] dt-bindings: mtd: partitions: Document new partition-dynamic nodes

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Message-Id: <20220220173905.14165-2-ansuelsmth@gmail.com>
Date:   Sun, 20 Feb 2022 18:39:04 +0100
From:   Ansuel Smith <ansuelsmth@...il.com>
To:     Miquel Raynal <miquel.raynal@...tlin.com>,
        Richard Weinberger <richard@....at>,
        Vignesh Raghavendra <vigneshr@...com>,
        Rob Herring <robh+dt@...nel.org>,
        Ansuel Smith <ansuelsmth@...il.com>,
        linux-mtd@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [RFC RFT PATCH v2 1/2] dt-bindings: mtd: partitions: Document new partition-dynamic nodes

Document new partition-dynamic nodes used to provide an OF node for
partition registred at runtime by parsers. This is required for nvmem
system to declare and detect nvmem-cells.

With these special partitions, only the label is required as the parser
will provide reg and offset of the mtd. NVMEM will use the data from the
parser and provide the NVMEM cells declared in the DTS, "connecting" the
dynamic partition with a static declaration of cells in them.

Signed-off-by: Ansuel Smith <ansuelsmth@...il.com>
---
 .../mtd/partitions/partition-dynamic.yaml     | 54 +++++++++++++++++++
 1 file changed, 54 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/mtd/partitions/partition-dynamic.yaml

diff --git a/Documentation/devicetree/bindings/mtd/partitions/partition-dynamic.yaml b/Documentation/devicetree/bindings/mtd/partitions/partition-dynamic.yaml
new file mode 100644
index 000000000000..945128e754ac
--- /dev/null
+++ b/Documentation/devicetree/bindings/mtd/partitions/partition-dynamic.yaml
@@ -0,0 +1,54 @@
+# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/mtd/partitions/partition-dynamic.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Dynamic Partition
+
+description: |
+  This binding describes a single flash partition that is dynamically allocated
+  by a dedicated parser that is not a fixed-partition parser. To declare a
+  partition the label is required. This can be used to give a dynamic partition
+  an OF node so that subsystems like NVMEM can work and provide NVMEM Cells to
+  the system. An example is declaring the partition label and all the NVMEM
+  cells in it. The parser will detect the correct reg and offset and the NVMEM
+  will register the cells in it based on the data extracted by the parser.
+
+maintainers:
+  - Ansuel Smith <ansuelsmth@...il.com>
+
+properties:
+  label:
+    description: The label / name for the partition assigned by the parser at
+      runtime. This is needed for sybsystem like NVMEM to define cells and
+      register with this OF node.
+
+required:
+  - label
+
+additionalProperties: true
+
+examples:
+  - |
+    partitions {
+      compatible = "qcom,smem-part";
+      #address-cells = <1>;
+      #size-cells = <1>;
+
+      art {
+        compatible = "nvmem-cells";
+        #address-cells = <1>;
+        #size-cells = <1>;
+
+        label = "0:art";
+
+        macaddr_art_0: macaddr@0 {
+          reg = <0x0 0x6>;
+        };
+
+        macaddr_art_6: macaddr@6 {
+          reg = <0x6 0x6>;
+        };
+      };
+    };
-- 
2.34.1