linux-kernel - [PATCH v3 1/3] dt-bindings: mtd: fixed-partitions: Add binman compatible

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Message-ID: <20231009201005.1964794-1-sjg@chromium.org>
Date:   Mon,  9 Oct 2023 14:09:59 -0600
From:   Simon Glass <sjg@...omium.org>
To:     devicetree@...r.kernel.org
Cc:     U-Boot Mailing List <u-boot@...ts.denx.de>,
        linux-mtd@...ts.infradead.org, Michael Walle <mwalle@...nel.org>,
        Tom Rini <trini@...sulko.com>, Rob Herring <robh@...nel.org>,
        Miquel Raynal <miquel.raynal@...tlin.com>,
        Simon Glass <sjg@...omium.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Dhruva Gole <d-gole@...com>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Rafał Miłecki <rafal@...ecki.pl>,
        Richard Weinberger <richard@....at>,
        Rob Herring <robh+dt@...nel.org>,
        Vignesh Raghavendra <vigneshr@...com>,
        linux-kernel@...r.kernel.org
Subject: [PATCH v3 1/3] dt-bindings: mtd: fixed-partitions: Add binman compatible

Add a compatible string for binman, so we can extend fixed-partitions
in various ways.

Signed-off-by: Simon Glass <sjg@...omium.org>
---

Changes in v3:
- Drop fixed-partition additional compatible string
- Drop fixed-partitions from the example
- Mention use of compatible instead of label

Changes in v2:
- Drop mention of 'enhanced features' in fixed-partitions.yaml
- Mention Binman input and output properties
- Use plain partition@xxx for the node name

 .../bindings/mtd/partitions/binman.yaml       | 63 +++++++++++++++++++
 .../bindings/mtd/partitions/partitions.yaml   |  1 +
 MAINTAINERS                                   |  5 ++
 3 files changed, 69 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/mtd/partitions/binman.yaml

diff --git a/Documentation/devicetree/bindings/mtd/partitions/binman.yaml b/Documentation/devicetree/bindings/mtd/partitions/binman.yaml
new file mode 100644
index 000000000000..7d6c8bd738f5
--- /dev/null
+++ b/Documentation/devicetree/bindings/mtd/partitions/binman.yaml
@@ -0,0 +1,63 @@
+# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
+# Copyright 2023 Google LLC
+
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/mtd/partitions/binman.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Binman firmware layout
+
+maintainers:
+  - Simon Glass <sjg@...omium.org>
+
+select: false
+
+description: |
+  The binman node provides a layout for firmware, used when packaging firmware
+  from multiple projects. It is based on fixed-partitions, with some
+  extensions, but uses 'compatible' to indicate the contents of the node, to
+  avoid perturbing or confusing existing installations which use 'label' for a
+  particular purpose.
+
+  Binman supports properties used as inputs to the firmware-packaging process,
+  such as those which control alignment of partitions. This binding addresses
+  these 'input' properties. For example, it is common for the 'reg' property
+  (an 'output' property) to be set by Binman, based on the alignment requested
+  in the input.
+
+  Once processing is complete, input properties have mostly served their
+  purpose, at least until the firmware is repacked later, e.g. due to a
+  firmware update. The 'fixed-partitions' binding should provide enough
+  information to read the firmware at runtime, including decompression if
+  needed.
+
+  Documentation for Binman is available at:
+
+  https://u-boot.readthedocs.io/en/latest/develop/package/binman.html
+
+  with the current image-description format at:
+
+  https://u-boot.readthedocs.io/en/latest/develop/package/binman.html#image-description-format
+
+allOf:
+  - $ref: /schemas/mtd/partitions/fixed-partitions.yaml#
+
+properties:
+  compatible:
+    const: binman
+
+additionalProperties: false
+
+examples:
+  - |
+    partitions {
+        compatible = "binman";
+        #address-cells = <1>;
+        #size-cells = <1>;
+
+        partition@...000 {
+            label = "u-boot";
+            reg = <0x100000 0xf00000>;
+        };
+    };
diff --git a/Documentation/devicetree/bindings/mtd/partitions/partitions.yaml b/Documentation/devicetree/bindings/mtd/partitions/partitions.yaml
index 1dda2c80747b..849fd15d085c 100644
--- a/Documentation/devicetree/bindings/mtd/partitions/partitions.yaml
+++ b/Documentation/devicetree/bindings/mtd/partitions/partitions.yaml
@@ -15,6 +15,7 @@ maintainers:
 
 oneOf:
   - $ref: arm,arm-firmware-suite.yaml
+  - $ref: binman.yaml
   - $ref: brcm,bcm4908-partitions.yaml
   - $ref: brcm,bcm947xx-cfe-partitions.yaml
   - $ref: fixed-partitions.yaml
diff --git a/MAINTAINERS b/MAINTAINERS
index c934244acc31..ebc8158fe67d 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -3536,6 +3536,11 @@ F:	Documentation/filesystems/bfs.rst
 F:	fs/bfs/
 F:	include/uapi/linux/bfs_fs.h
 
+BINMAN
+M:	Simon Glass <sjg@...omium.org>
+S:	Supported
+F:	Documentation/devicetree/bindings/mtd/partitions/binman*
+
 BITMAP API
 M:	Yury Norov <yury.norov@...il.com>
 R:	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
-- 
2.42.0.609.gbb76f46606-goog