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76 lines
2.1 KiB
Diff
76 lines
2.1 KiB
Diff
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From 15cfca011ac1e08e073628b36f40d64f03fcf2b2 Mon Sep 17 00:00:00 2001
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From: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
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Date: Thu, 10 Dec 2020 19:22:45 +0100
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Subject: [PATCH] dt-bindings: nvmem: Add bindings for rmem driver
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Firmware/co-processors might use reserved memory areas in order to pass
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data stemming from an nvmem device otherwise non accessible to Linux.
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For example an EEPROM memory only physically accessible to firmware, or
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data only accessible early at boot time.
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Introduce the dt-bindings to nvmem's rmem.
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Signed-off-by: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
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---
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Changes since v1:
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- Update schema to new driver design
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---
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.../devicetree/bindings/nvmem/rmem.yaml | 49 +++++++++++++++++++
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1 file changed, 49 insertions(+)
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create mode 100644 Documentation/devicetree/bindings/nvmem/rmem.yaml
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--- /dev/null
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+++ b/Documentation/devicetree/bindings/nvmem/rmem.yaml
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@@ -0,0 +1,49 @@
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+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
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+%YAML 1.2
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+---
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+$id: http://devicetree.org/schemas/nvmem/rmem.yaml#
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+$schema: http://devicetree.org/meta-schemas/core.yaml#
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+
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+title: Reserved Memory Based nvmem Device
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+
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+maintainers:
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+ - Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
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+
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+allOf:
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+ - $ref: "nvmem.yaml#"
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+
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+properties:
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+ compatible:
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+ items:
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+ - enum:
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+ - raspberrypi,bootloader-config
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+ - const: nvmem-rmem
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+
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+ no-map:
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+ $ref: /schemas/types.yaml#/definitions/flag
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+ description:
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+ Avoid creating a virtual mapping of the region as part of the OS'
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+ standard mapping of system memory.
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+
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+required:
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+ - compatible
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+ - no-map
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+
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+unevaluatedProperties: false
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+
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+examples:
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+ - |
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+ reserved-memory {
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+ #address-cells = <1>;
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+ #size-cells = <1>;
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+
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+ blconfig: nvram@10000000 {
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+ compatible = "raspberrypi,bootloader-config", "nvmem-rmem";
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+ #address-cells = <1>;
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+ #size-cells = <1>;
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+ reg = <0x10000000 0x1000>;
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+ no-map;
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+ };
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+ };
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+
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+...
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