linux-kernel - [RFC RFT PATCH v3 1/2] dt-bindings: mtd: partitions: Document new partition-dynamic nodes

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Date:   Thu, 24 Feb 2022 16:20:42 +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>,
        Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>,
        linux-mtd@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [RFC RFT PATCH v3 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, the reg / offset is not required.
The node name must be in the form of "partition name"-dynamic.
If the partition can't be displayed using the node name, it's possible
to use the label binding that will be used instead of the node name.
The node name or the label binding is used to match the partition
allocated by the parser at runtime and 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     | 56 +++++++++++++++++++
 .../mtd/partitions/qcom,smem-part.yaml        |  4 ++
 2 files changed, 60 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..e0efa58e4fac
--- /dev/null
+++ b/Documentation/devicetree/bindings/mtd/partitions/partition-dynamic.yaml
@@ -0,0 +1,56 @@
+# 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.
+
+  A dynamic partition require the node ending with the "-dynamic" tag and if the
+  dynamic partition name can't be displayed using the node name, the label
+  properties can be used. The node name or the label have to match the dynamic
+  partition allocated by the parser.
+
+  These special partition definition can be used to give a dynamic partition
+  an OF node to declare NVMEM cells. 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.
+
+additionalProperties: true
+
+examples:
+  - |
+    flash {
+      partitions {
+        compatible = "qcom,smem-part";
+
+        art-dynamic {
+          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>;
+          };
+        };
+      };
+    };
diff --git a/Documentation/devicetree/bindings/mtd/partitions/qcom,smem-part.yaml b/Documentation/devicetree/bindings/mtd/partitions/qcom,smem-part.yaml
index cf3f8c1e035d..1d7d9b3378c3 100644
--- a/Documentation/devicetree/bindings/mtd/partitions/qcom,smem-part.yaml
+++ b/Documentation/devicetree/bindings/mtd/partitions/qcom,smem-part.yaml
@@ -19,6 +19,10 @@ properties:
   compatible:
     const: qcom,smem-part
 
+patternProperties:
+  "-dynamic$":
+    $ref: "partition-dynamic.yaml#"
+
 required:
   - compatible
 
-- 
2.34.1