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Subject[PATCH V2 2/3] dt-bindings: nvmem: add U-Boot environment variables binding
Date
From: Rafał Miłecki <rafal@milecki.pl>

This binding allows describing a (part of) MTD device (partition) that
contains a block with environment variables. Operating system usually
needs to parse that block to read variables values that may affect
booting process & device configuration.

Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
---
V2: s/u,boot/u-boot/
---
.../devicetree/bindings/nvmem/u-boot,env.yaml | 56 +++++++++++++++++++
MAINTAINERS | 5 ++
2 files changed, 61 insertions(+)
create mode 100644 Documentation/devicetree/bindings/nvmem/u-boot,env.yaml

diff --git a/Documentation/devicetree/bindings/nvmem/u-boot,env.yaml b/Documentation/devicetree/bindings/nvmem/u-boot,env.yaml
new file mode 100644
index 000000000000..e3296e005ffd
--- /dev/null
+++ b/Documentation/devicetree/bindings/nvmem/u-boot,env.yaml
@@ -0,0 +1,56 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/nvmem/u-boot,env.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: U-Boot environment variables
+
+description: |
+ U-Boot uses environment variables to store device parameters and
+ configuration. They may be used for booting process, setup or keeping end user
+ interesting info.
+
+ Data is stored on flash partition in a U-Boot specific format (CRC32 and NUL
+ separated key-value pairs).
+
+ This binding allows specifying data location and format (default one or vendor
+ specific).
+
+maintainers:
+ - Rafał Miłecki <rafal@milecki.pl>
+
+allOf:
+ - $ref: nvmem.yaml#
+
+properties:
+ compatible:
+ enum:
+ - u-boot,env
+ - brcm,env
+
+ reg:
+ maxItems: 1
+
+unevaluatedProperties: false
+
+examples:
+ - |
+ partitions {
+ compatible = "fixed-partitions";
+ #address-cells = <1>;
+ #size-cells = <1>;
+
+ partition@0 {
+ label = "uboot";
+ reg = <0x0 0x100000>;
+
+ #address-cells = <1>;
+ #size-cells = <1>;
+
+ nvmem@10000 {
+ compatible = "u-boot,env";
+ reg = <0x10000 0x10000>;
+ };
+ };
+ };
diff --git a/MAINTAINERS b/MAINTAINERS
index 67558097bb66..271c29c84c7d 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -19624,6 +19624,11 @@ W: http://linuxtv.org
T: git git://linuxtv.org/media_tree.git
F: drivers/media/pci/tw686x/

+U-BOOT ENVIRONMENT VARIABLES
+M: Rafał Miłecki <rafal@milecki.pl>
+S: Maintained
+F: Documentation/devicetree/bindings/nvmem/u-boot,env.yaml
+
UACCE ACCELERATOR FRAMEWORK
M: Zhangfei Gao <zhangfei.gao@linaro.org>
M: Zhou Wang <wangzhou1@hisilicon.com>
--
2.31.1
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