linux-kernel - [PATCH v2 1/4] dt-bindings: nvmem: Add bootcount-nvmem

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Date:   Wed, 28 Apr 2021 16:50:38 +0300
From:   Nandor Han <nandor.han@...sala.com>
To:     srinivas.kandagatla@...aro.org, robh+dt@...nel.org,
        linux-kernel@...r.kernel.org, devicetree@...r.kernel.org
Cc:     Nandor Han <nandor.han@...sala.com>
Subject: [PATCH v2 1/4] dt-bindings: nvmem: Add bootcount-nvmem

Documents the device tree bindings for `bootcount-nvmem` driver.

Signed-off-by: Nandor Han <nandor.han@...sala.com>
---
 .../bindings/nvmem/bootcount-nvmem.yaml       | 66 +++++++++++++++++++
 1 file changed, 66 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/nvmem/bootcount-nvmem.yaml

diff --git a/Documentation/devicetree/bindings/nvmem/bootcount-nvmem.yaml b/Documentation/devicetree/bindings/nvmem/bootcount-nvmem.yaml
new file mode 100644
index 000000000000..cc673452fe0f
--- /dev/null
+++ b/Documentation/devicetree/bindings/nvmem/bootcount-nvmem.yaml
@@ -0,0 +1,66 @@
+# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
+# Copyright (c) Vaisala Oyj. All rights reserved.
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/nvmem/bootcount-nvmem.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Bootcount NVMEM bindings
+
+maintainers:
+  - Nandor Han <nandor.han@...sala.com>
+
+description: |
+  This binding is intendent to describe the hardware location for
+  storing the bootcount value and magic combo.
+
+  The NVMEM cell size should be 2 or 4 bytes.
+
+allOf:
+  - $ref: "nvmem-consumer.yaml#"
+
+properties:
+  compatible:
+    enum:
+      - linux,bootcount-nvmem
+
+  nvmem-cells:
+    description: Phandle to reboot mode nvmem data cell.
+    $ref: /schemas/types.yaml#/definitions/phandle-array
+
+  nvmem-cell-names:
+    description: Name of the NVMEM cell.
+    $ref: /schemas/types.yaml#/definitions/string-array
+    enum:
+      - bootcount-regs
+
+  linux,bootcount-magic:
+    description: Override default mask value.
+    $ref: /schemas/types.yaml#/definitions/uint32
+
+dependencies:
+  nvmem-cell-names: [ nvmem-cells ]
+
+required:
+  - compatible
+  - nvmem-cells
+  - nvmem-cell-names
+
+additionalProperties: false
+
+examples:
+  # example with 16 bit nvram cell:
+  - |
+    bootcount {
+        compatible = "linux,bootcount-nvmem";
+        nvmem-cells = <&bootcount_regs>;
+        nvmem-cell-names = "bootcount-regs";
+    };
+
+    rtc: rtc@68 {
+        bootcount_regs: bootcount_nvmem_regs@e {
+            reg = <0x0e 0x2>;
+        };
+    };
+
+...
-- 
2.26.3