linux-kernel - [PATCH 1/4] dt-bindings: nvmem: mmio: new binding for MMIO accessible NVMEM devices

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Message-Id: <20230201064717.18410-2-zajec5@gmail.com>
Date:   Wed,  1 Feb 2023 07:47:14 +0100
From:   Rafał Miłecki <zajec5@...il.com>
To:     Srinivas Kandagatla <srinivas.kandagatla@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>
Cc:     Matthias Brugger <matthias.bgg@...il.com>,
        Kunihiko Hayashi <hayashi.kunihiko@...ionext.com>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        linux-mediatek@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Rafał Miłecki <rafal@...ecki.pl>
Subject: [PATCH 1/4] dt-bindings: nvmem: mmio: new binding for MMIO accessible NVMEM devices

From: Rafał Miłecki <rafal@...ecki.pl>

With the NVMEM layouts binding in place we should now use:
1. NVMEM device access bindings
2. NVMEM content description bindings

This binding allows describing NVMEM devices that can be MMIO accessed.

Signed-off-by: Rafał Miłecki <rafal@...ecki.pl>
---
 .../devicetree/bindings/nvmem/mmio.yaml       | 46 +++++++++++++++++++
 1 file changed, 46 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/nvmem/mmio.yaml

diff --git a/Documentation/devicetree/bindings/nvmem/mmio.yaml b/Documentation/devicetree/bindings/nvmem/mmio.yaml
new file mode 100644
index 000000000000..27e3f6142769
--- /dev/null
+++ b/Documentation/devicetree/bindings/nvmem/mmio.yaml
@@ -0,0 +1,46 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/nvmem/mmio.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: MMIO access based NVMEM
+
+description: |
+  This binding describes simple NVMEM devices that can be accessed by using MMIO
+  (memory-mapped I/O access).
+
+  It's a generic solution for providing NVMEM content access. The way of
+  handling actual content may be device specific and can be described using a
+  proper layout.
+
+maintainers:
+  - Rafał Miłecki <rafal@...ecki.pl>
+
+allOf:
+  - $ref: nvmem.yaml#
+
+properties:
+  compatible:
+    const: mmio-nvmem
+
+  reg:
+    maxItems: 1
+
+  reg-io-width:
+    description: |
+      The size (in bytes) of the IO accesses that should be performed
+      on the device.
+    enum: [1, 2, 4, 8]
+
+required:
+  - reg
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    nvmem@...00 {
+        compatible = "mmio-nvmem";
+        reg = <0x10000000 0x10000>;
+    };
-- 
2.34.1