linux-kernel - [PATCH RFC *RFC*] dt-bindings: add U-Boot chosen for environment data phandle

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Message-Id: <20220217120856.2910-1-zajec5@gmail.com>
Date:   Thu, 17 Feb 2022 13:08:56 +0100
From:   Rafał Miłecki <zajec5@...il.com>
To:     Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>
Cc:     devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        Tom Rini <trini@...sulko.com>,
        Ricardo Salveti <ricardo@...ndries.io>,
        Michal Simek <michal.simek@...inx.com>,
        Jorge Ramirez-Ortiz <jorge@...ndries.io>, u-boot@...ts.denx.de,
        Rafał Miłecki <rafal@...ecki.pl>
Subject: [PATCH RFC *RFC*] dt-bindings: add U-Boot chosen for environment data phandle

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

This is RFC and request for a help & discussion.

While reviewing patch for U-Boot env binding it has been mentioned that:

1. /Processing/ whole DT in U-Boot may be too much work
   Handling flash devices, partitions, their formats & NVMEM may require
   too many U-Boot drivers involved.

2. It'd be nice to have env data storage devices pointed in chosen

I wrote this hacky PATCH to give a rough idea how it could look like.

Please review this and let me know:
1. If solution with chosen + phandles is acceptable
2. How to properly name .yaml file
3. Where it put it

Signed-off-by: Rafał Miłecki <rafal@...ecki.pl>
---
 .../devicetree/bindings/u-boot,chosen.yaml    | 39 +++++++++++++++++++
 1 file changed, 39 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/u-boot,chosen.yaml

diff --git a/Documentation/devicetree/bindings/u-boot,chosen.yaml b/Documentation/devicetree/bindings/u-boot,chosen.yaml
new file mode 100644
index 000000000000..8369da91193d
--- /dev/null
+++ b/Documentation/devicetree/bindings/u-boot,chosen.yaml
@@ -0,0 +1,39 @@
+# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/u-boot,chosen.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: U-Boot setup
+
+maintainers:
+  - Rafał Miłecki <rafal@...ecki.pl>
+
+properties:
+  u-boot,env:
+    $ref: /schemas/types.yaml#/definitions/phandle-array
+    description: |
+      A list of storage volumes containing U-Boot environment data.
+
+      Env data can be stored on various kinds of storage devices, e.g.:
+      1. Raw flash partition
+      2. UBI volume
+
+additionalProperties: true
+
+examples:
+  - |
+    chosen {
+        u-boot,env = <&env>;
+    };
+
+    partitions {
+        compatible = "fixed-partitions";
+        #address-cells = <1>;
+        #size-cells = <1>;
+
+        env: partition@0 {
+            reg = <0x0000000 0x1000>;
+            label = "u-boot-env";
+        };
+    };
-- 
2.34.1