[PATCH v3] dt-bindings: nvmem: add binding for QTI SPMI SDAM

[Shyam Kumar Thella]

QTI SDAM allows PMIC peripherals to access the shared memory that is
available on QTI PMICs. Add documentation for it.

Signed-off-by: Shyam Kumar Thella <sthella@xxxxxxxxxxxxxx>
---
 .../devicetree/bindings/nvmem/qcom,spmi-sdam.yaml  | 83 ++++++++++++++++++++++
 1 file changed, 83 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/nvmem/qcom,spmi-sdam.yaml

diff --git a/Documentation/devicetree/bindings/nvmem/qcom,spmi-sdam.yaml b/Documentation/devicetree/bindings/nvmem/qcom,spmi-sdam.yaml
new file mode 100644
index 0000000..f2e640f
--- /dev/null
+++ b/Documentation/devicetree/bindings/nvmem/qcom,spmi-sdam.yaml
@@ -0,0 +1,83 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/nvmem/qcom,spmi-sdam.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Qualcomm Technologies, Inc. SPMI SDAM DT bindings
+
+maintainers:
+  - Shyam Kumar Thella <sthella@xxxxxxxxxxxxxx>
+
+description: |
+  The SDAM provides scratch register space for the PMIC clients. This
+  memory can be used by software to store information or communicate
+  to/from the PBUS.
+
+allOf:
+  - $ref: "nvmem.yaml#"
+
+properties:
+  compatible:
+    enum:
+      - qcom,spmi-sdam
+
+  reg:
+    maxItems: 1
+
+  "#address-cells":
+    const: 1
+
+  "#size-cells":
+    const: 1
+
+  ranges: true
+
+required:
+  - compatible
+  - reg
+
+patternProperties:
+  "^.*@[0-9a-f]+$":
+    type: object
+
+    properties:
+      reg:
+        maxItems: 1
+        description:
+          Offset and size in bytes within the storage device.
+
+      bits:
+        $ref: /schemas/types.yaml#/definitions/uint32-array
+        maxItems: 1
+        items:
+          items:
+            - minimum: 0
+              description:
+                Offset in bit within the address range specified by reg.
+            - minimum: 1
+              description:
+                Size in bit within the address range specified by reg.
+
+    required:
+      - reg
+      - ranges
+
+    additionalProperties: false
+
+examples:
+  - |
+      sdam_1: nvram@b000 {
+         #address-cells = <1>;
+         #size-cells = <1>;
+         compatible = "qcom,spmi-sdam";
+          reg = <0xb000 0x100>;
+          ranges = <0 0xb000 0x100>;
+
+          /* Data cells */
+          restart_reason: restart@50 {
+              reg = <0x50 0x1>;
+              bits = <6 2>;
+          };
+      };
+...
-- 
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