linux-kernel - [PATCH 3/6] dt-bindings: nvmem: convert U-Boot env vars to NVMEM layout

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Message-Id: <20230110105425.13188-3-zajec5@gmail.com>
Date:   Tue, 10 Jan 2023 11:54:22 +0100
From:   Rafał Miłecki <zajec5@...il.com>
To:     Srinivas Kandagatla <srinivas.kandagatla@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>
Cc:     Shawn Guo <shawnguo@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        Fabio Estevam <festevam@...il.com>,
        NXP Linux Team <linux-imx@....com>,
        Miquel Raynal <miquel.raynal@...tlin.com>,
        Michael Walle <michael@...le.cc>, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        u-boot@...ts.denx.de,
        Rafał Miłecki <rafal@...ecki.pl>
Subject: [PATCH 3/6] dt-bindings: nvmem: convert U-Boot env vars to NVMEM layout

From: Rafał Miłecki <rafal@...ecki.pl>

U-Boot environment variables can be found of various underlaying storage
entities. This binding should be defined as a layout on top on NVMEM
device not a NVMEM device itself.

Signed-off-by: Rafał Miłecki <rafal@...ecki.pl>
---
 .../bindings/nvmem/layouts/nvmem-layout.yaml  |  1 +
 .../nvmem/{ => layouts}/u-boot,env.yaml       | 29 ++++++++++---------
 MAINTAINERS                                   |  2 +-
 3 files changed, 17 insertions(+), 15 deletions(-)
 rename Documentation/devicetree/bindings/nvmem/{ => layouts}/u-boot,env.yaml (77%)

diff --git a/Documentation/devicetree/bindings/nvmem/layouts/nvmem-layout.yaml b/Documentation/devicetree/bindings/nvmem/layouts/nvmem-layout.yaml
index 8512ee538c4c..8835b1781a9f 100644
--- a/Documentation/devicetree/bindings/nvmem/layouts/nvmem-layout.yaml
+++ b/Documentation/devicetree/bindings/nvmem/layouts/nvmem-layout.yaml
@@ -20,6 +20,7 @@ description: |
 oneOf:
   - $ref: kontron,sl28-vpd.yaml
   - $ref: onie,tlv-layout.yaml
+  - $ref: u-boot,env.yaml
 
 properties:
   compatible: true
diff --git a/Documentation/devicetree/bindings/nvmem/u-boot,env.yaml b/Documentation/devicetree/bindings/nvmem/layouts/u-boot,env.yaml
similarity index 77%
rename from Documentation/devicetree/bindings/nvmem/u-boot,env.yaml
rename to Documentation/devicetree/bindings/nvmem/layouts/u-boot,env.yaml
index cbc5c69fd405..fb273b174fe7 100644
--- a/Documentation/devicetree/bindings/nvmem/u-boot,env.yaml
+++ b/Documentation/devicetree/bindings/nvmem/layouts/u-boot,env.yaml
@@ -1,10 +1,10 @@
 # SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
 %YAML 1.2
 ---
-$id: http://devicetree.org/schemas/nvmem/u-boot,env.yaml#
+$id: http://devicetree.org/schemas/nvmem/layouts/u-boot,env.yaml#
 $schema: http://devicetree.org/meta-schemas/core.yaml#
 
-title: U-Boot environment variables
+title: NVMEM layout of U-Boot environment variables
 
 description: |
   U-Boot uses environment variables to store device parameters and
@@ -14,16 +14,11 @@ description: |
   Data is stored using U-Boot specific formats (variant specific header and NUL
   separated key-value pairs).
 
-  Environment data can be stored on various storage entities, e.g.:
+  Environment data can be stored on NVMEM devices of various underlaying storage
+  entities, e.g.:
   1. Raw flash partition
   2. UBI volume
 
-  This binding allows marking storage device (as containing env data) and
-  specifying used format.
-
-  Right now only flash partition case is covered but it may be extended to e.g.
-  UBI volumes in the future.
-
   Variables can be defined as NVMEM device subnodes.
 
 maintainers:
@@ -67,11 +62,14 @@ examples:
             read-only;
         };
 
-        env: partition@...00 {
-            compatible = "u-boot,env";
+        partition@...00 {
             reg = <0x40000 0x10000>;
 
-            mac: ethaddr {
+            nvmem-layout {
+                compatible = "u-boot,env";
+
+                mac: ethaddr {
+                };
             };
         };
     };
@@ -87,9 +85,12 @@ examples:
             label = "u-boot";
 
             partition-u-boot-env {
-                compatible = "brcm,env";
 
-                ethaddr {
+                nvmem-layout {
+                    compatible = "brcm,env";
+
+                    ethaddr {
+                    };
                 };
             };
         };
diff --git a/MAINTAINERS b/MAINTAINERS
index 2a1368722c45..2e13ee875c77 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -21136,7 +21136,7 @@ F:	drivers/media/pci/tw686x/
 U-BOOT ENVIRONMENT VARIABLES
 M:	Rafał Miłecki <rafal@...ecki.pl>
 S:	Maintained
-F:	Documentation/devicetree/bindings/nvmem/u-boot,env.yaml
+F:	Documentation/devicetree/bindings/nvmem/layouts/u-boot,env.yaml
 F:	drivers/nvmem/u-boot-env.c
 
 UACCE ACCELERATOR FRAMEWORK
-- 
2.34.1