target/linux/bcm27xx/patches-5.10/950-0445-dt-bindings-nvmem-Add-bindings-for-rmem-driver.patch

   1 From 15cfca011ac1e08e073628b36f40d64f03fcf2b2 Mon Sep 17 00:00:00 2001
   2 From: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
   3 Date: Thu, 10 Dec 2020 19:22:45 +0100
   4 Subject: [PATCH] dt-bindings: nvmem: Add bindings for rmem driver
   5
   6 Firmware/co-processors might use reserved memory areas in order to pass
   7 data stemming from an nvmem device otherwise non accessible to Linux.
   8 For example an EEPROM memory only physically accessible to firmware, or
   9 data only accessible early at boot time.
  10
  11 Introduce the dt-bindings to nvmem's rmem.
  12
  13 Signed-off-by: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
  14
  15 ---
  16
  17 Changes since v1:
  18  - Update schema to new driver design
  19 ---
  20  .../devicetree/bindings/nvmem/rmem.yaml       | 49 +++++++++++++++++++
  21  1 file changed, 49 insertions(+)
  22  create mode 100644 Documentation/devicetree/bindings/nvmem/rmem.yaml
  23
  24 --- /dev/null
  25 +++ b/Documentation/devicetree/bindings/nvmem/rmem.yaml
  26 @@ -0,0 +1,49 @@
  27 +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
  28 +%YAML 1.2
  29 +---
  30 +$id: http://devicetree.org/schemas/nvmem/rmem.yaml#
  31 +$schema: http://devicetree.org/meta-schemas/core.yaml#
  32 +
  33 +title: Reserved Memory Based nvmem Device
  34 +
  35 +maintainers:
  36 +  - Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
  37 +
  38 +allOf:
  39 +  - $ref: "nvmem.yaml#"
  40 +
  41 +properties:
  42 +  compatible:
  43 +    items:
  44 +      - enum:
  45 +        - raspberrypi,bootloader-config
  46 +      - const: nvmem-rmem
  47 +
  48 +  no-map:
  49 +    $ref: /schemas/types.yaml#/definitions/flag
  50 +    description:
  51 +      Avoid creating a virtual mapping of the region as part of the OS'
  52 +      standard mapping of system memory.
  53 +
  54 +required:
  55 +  - compatible
  56 +  - no-map
  57 +
  58 +unevaluatedProperties: false
  59 +
  60 +examples:
  61 +  - |
  62 +        reserved-memory {
  63 +                #address-cells = <1>;
  64 +                #size-cells = <1>;
  65 +
  66 +                blconfig: nvram@10000000 {
  67 +                        compatible = "raspberrypi,bootloader-config", "nvmem-rmem";
  68 +                        #address-cells = <1>;
  69 +                        #size-cells = <1>;
  70 +                        reg = <0x10000000 0x1000>;
  71 +                        no-map;
  72 +                };
  73 +        };
  74 +
  75 +...