linux-kernel - [PATCH v2 1/5] dt-bindings: nvmem: Add bindings for rmem driver

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Date:   Fri, 18 Dec 2020 16:43:16 +0100
From:   Nicolas Saenz Julienne <nsaenzjulienne@...e.de>
To:     srinivas.kandagatla@...aro.org, linux-kernel@...r.kernel.org,
        Saenz Julienne <nsaenzjulienne@...e.de>
Cc:     linux-arm-kernel@...ts.infradead.org, linux@...linux.org.uk,
        catalin.marinas@....com, will@...nel.org,
        devicetree@...r.kernel.org, linux-rpi-kernel@...ts.infradead.org,
        robh+dt@...nel.org, bcm-kernel-feedback-list@...adcom.com,
        tim.gover@...pberrypi.com, phil@...pberrypi.com
Subject: [PATCH v2 1/5] dt-bindings: nvmem: Add bindings for rmem driver

Firmware/co-processors might use reserved memory areas in order to pass
data stemming from an nvmem device otherwise non accessible to Linux.
For example an EEPROM memory only physically accessible to firmware, or
data only accessible early at boot time.

Introduce the dt-bindings to nvmem's rmem.

Signed-off-by: Nicolas Saenz Julienne <nsaenzjulienne@...e.de>

---

Changes since v1:
 - Update schema to new driver design

 .../devicetree/bindings/nvmem/rmem.yaml       | 49 +++++++++++++++++++
 1 file changed, 49 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/nvmem/rmem.yaml

diff --git a/Documentation/devicetree/bindings/nvmem/rmem.yaml b/Documentation/devicetree/bindings/nvmem/rmem.yaml
new file mode 100644
index 000000000000..29b53871aa02
--- /dev/null
+++ b/Documentation/devicetree/bindings/nvmem/rmem.yaml
@@ -0,0 +1,49 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/nvmem/rmem.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Reserved Memory Based nvmem Device
+
+maintainers:
+  - Nicolas Saenz Julienne <nsaenzjulienne@...e.de>
+
+allOf:
+  - $ref: "nvmem.yaml#"
+
+properties:
+  compatible:
+    items:
+      - enum:
+        - raspberrypi,bootloader-config
+      - const: nvmem-rmem
+
+  no-map:
+    $ref: /schemas/types.yaml#/definitions/flag
+    description:
+      Avoid creating a virtual mapping of the region as part of the OS'
+      standard mapping of system memory.
+
+required:
+  - compatible
+  - no-map
+
+unevaluatedProperties: false
+
+examples:
+  - |
+        reserved-memory {
+                #address-cells = <1>;
+                #size-cells = <1>;
+
+                blconfig: nvram@...00000 {
+                        compatible = "raspberrypi,bootloader-config", "nvmem-rmem";
+                        #address-cells = <1>;
+                        #size-cells = <1>;
+                        reg = <0x10000000 0x1000>;
+                        no-map;
+                };
+        };
+
+...
-- 
2.29.2