target/linux/bcm53xx/patches-5.4/181-0001-dt-bindings-firmware-add-Broadcom-s-NVRAM-memory-map.patch

   1 From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= <rafal@milecki.pl>
   2 Date: Tue, 2 Mar 2021 08:23:35 +0100
   3 Subject: [PATCH] dt-bindings: firmware: add Broadcom's NVRAM memory mapping
   4
   5 NVRAM structure contains device data and can be accessed using MMIO.
   6
   7 Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
   8 ---
   9  .../bindings/firmware/brcm,nvram.yaml         | 41 +++++++++++++++++++
  10  1 file changed, 41 insertions(+)
  11  create mode 100644 Documentation/devicetree/bindings/firmware/brcm,nvram.yaml
  12
  13 --- /dev/null
  14 +++ b/Documentation/devicetree/bindings/firmware/brcm,nvram.yaml
  15 @@ -0,0 +1,41 @@
  16 +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
  17 +%YAML 1.2
  18 +---
  19 +$id: "http://devicetree.org/schemas/firmware/brcm,nvram.yaml#"
  20 +$schema: "http://devicetree.org/meta-schemas/core.yaml#"
  21 +
  22 +title: Broadcom's NVRAM
  23 +
  24 +maintainers:
  25 +  - Rafał Miłecki <rafal@milecki.pl>
  26 +
  27 +description: |
  28 +  NVRAM is a structure containing device specific environment variables.
  29 +  It is used for storing device configuration, booting parameters and
  30 +  calibration data.
  31 +
  32 +  It's required very early in booting process and so is made available
  33 +  using memory mapping.
  34 +
  35 +  NVRAM can be found on Broadcom BCM47xx MIPS, Northstar ARM Cortex-A9
  36 +  and some more devices.
  37 +
  38 +properties:
  39 +  compatible:
  40 +    const: brcm,nvram
  41 +
  42 +  reg:
  43 +    description: memory region with NVRAM data
  44 +    maxItems: 1
  45 +
  46 +required:
  47 +  - reg
  48 +
  49 +additionalProperties: false
  50 +
  51 +examples:
  52 +  - |
  53 +    nvram@1e000000 {
  54 +         compatible = "brcm,nvram";
  55 +         reg = <0x1e000000 0x10000>;
  56 +    };