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Date: Fri, 17 Mar 2023 14:26:17 +0100
From: Rafał Miłecki <zajec5@...il.com>
To: Rob Herring <robh+dt@...nel.org>,
Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Miquel Raynal <miquel.raynal@...tlin.com>,
Michael Walle <michael@...le.cc>, devicetree@...r.kernel.org,
linux-kernel@...r.kernel.org,
Rafał Miłecki <rafal@...ecki.pl>
Subject: [PATCH V4 1/4] dt-bindings: nvmem: layouts: add fixed-layout
From: Rafał Miłecki <rafal@...ecki.pl>
With the introduction of NVMEM layouts, new NVMEM content structures
should be defined as such. We should also try to convert / migrate
existing NVMEM content bindings to layouts.
This commit handles fixed NVMEM cells. So far they had to be defined
directly - as device subnodes. With this change it's allowed to put them
in the DT node named "nvmem-layout".
Having NVMEM cells in separated node is prefered as it draws a nice line
between NVMEM device and its content. It results in cleaner bindings.
FWIW a very similiar situation has happened to MTD devices and their
partitions: see commit 5d96ea42eb63 ("dt-bindings: mtd: Clarify all
partition subnodes").
Signed-off-by: Rafał Miłecki <rafal@...ecki.pl>
---
.../bindings/nvmem/layouts/fixed-cell.yaml | 31 ++++++++++++
.../bindings/nvmem/layouts/fixed-layout.yaml | 49 +++++++++++++++++++
.../bindings/nvmem/layouts/nvmem-layout.yaml | 5 +-
.../devicetree/bindings/nvmem/nvmem.yaml | 19 +------
4 files changed, 83 insertions(+), 21 deletions(-)
create mode 100644 Documentation/devicetree/bindings/nvmem/layouts/fixed-cell.yaml
create mode 100644 Documentation/devicetree/bindings/nvmem/layouts/fixed-layout.yaml
diff --git a/Documentation/devicetree/bindings/nvmem/layouts/fixed-cell.yaml b/Documentation/devicetree/bindings/nvmem/layouts/fixed-cell.yaml
new file mode 100644
index 000000000000..e698098450e1
--- /dev/null
+++ b/Documentation/devicetree/bindings/nvmem/layouts/fixed-cell.yaml
@@ -0,0 +1,31 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/nvmem/layouts/fixed-cell.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Fixed offset & size NVMEM cell
+
+maintainers:
+ - Rafał Miłecki <rafal@...ecki.pl>
+ - Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
+
+properties:
+ reg:
+ maxItems: 1
+
+ bits:
+ $ref: /schemas/types.yaml#/definitions/uint32-array
+ items:
+ - minimum: 0
+ maximum: 7
+ description:
+ Offset in bit within the address range specified by reg.
+ - minimum: 1
+ description:
+ Size in bit within the address range specified by reg.
+
+required:
+ - reg
+
+additionalProperties: true
diff --git a/Documentation/devicetree/bindings/nvmem/layouts/fixed-layout.yaml b/Documentation/devicetree/bindings/nvmem/layouts/fixed-layout.yaml
new file mode 100644
index 000000000000..f7496ba28f33
--- /dev/null
+++ b/Documentation/devicetree/bindings/nvmem/layouts/fixed-layout.yaml
@@ -0,0 +1,49 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/nvmem/layouts/fixed-layout.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: NVMEM layout for fixed NVMEM cells
+
+description:
+ Many NVMEM devices have hardcoded cells layout (offset and size of defined
+ NVMEM content doesn't change).
+
+ This binding allows defining such NVMEM layout with its cells. It can be used
+ on top of any NVMEM device.
+
+maintainers:
+ - Rafał Miłecki <rafal@...ecki.pl>
+
+properties:
+ compatible:
+ const: fixed-layout
+
+ "#address-cells":
+ const: 1
+
+ "#size-cells":
+ const: 1
+
+patternProperties:
+ "@[a-f0-9]+$":
+ type: object
+ $ref: fixed-cell.yaml
+
+required:
+ - compatible
+
+additionalProperties: false
+
+examples:
+ - |
+ nvmem-layout {
+ compatible = "fixed-layout";
+ #address-cells = <1>;
+ #size-cells = <1>;
+
+ calibration@...0 {
+ reg = <0x4000 0x100>;
+ };
+ };
diff --git a/Documentation/devicetree/bindings/nvmem/layouts/nvmem-layout.yaml b/Documentation/devicetree/bindings/nvmem/layouts/nvmem-layout.yaml
index 8512ee538c4c..3b40f7880774 100644
--- a/Documentation/devicetree/bindings/nvmem/layouts/nvmem-layout.yaml
+++ b/Documentation/devicetree/bindings/nvmem/layouts/nvmem-layout.yaml
@@ -18,16 +18,13 @@ description: |
perform their parsing. The nvmem-layout container is here to describe these.
oneOf:
+ - $ref: fixed-layout.yaml
- $ref: kontron,sl28-vpd.yaml
- $ref: onie,tlv-layout.yaml
properties:
compatible: true
- '#address-cells': false
-
- '#size-cells': false
-
required:
- compatible
diff --git a/Documentation/devicetree/bindings/nvmem/nvmem.yaml b/Documentation/devicetree/bindings/nvmem/nvmem.yaml
index 75bb93dda9df..b79f1bb795fb 100644
--- a/Documentation/devicetree/bindings/nvmem/nvmem.yaml
+++ b/Documentation/devicetree/bindings/nvmem/nvmem.yaml
@@ -49,23 +49,8 @@ properties:
patternProperties:
"@[0-9a-f]+(,[0-7])?$":
type: object
-
- properties:
- reg:
- maxItems: 1
- description:
- Offset and size in bytes within the storage device.
-
- bits:
- $ref: /schemas/types.yaml#/definitions/uint32-array
- items:
- - minimum: 0
- maximum: 7
- description:
- Offset in bit within the address range specified by reg.
- - minimum: 1
- description:
- Size in bit within the address range specified by reg.
+ $ref: layouts/fixed-cell.yaml
+ deprecated: true
additionalProperties: true
--
2.34.1
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