linux-kernel - [PATCH 1/2] dt-bindings: pinctrl: convert controller description to the json-schema

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Date:   Wed, 10 Nov 2021 17:57:19 +0100
From:   Rafał Miłecki <zajec5@...il.com>
To:     Linus Walleij <linus.walleij@...aro.org>,
        Rob Herring <robh+dt@...nel.org>
Cc:     linux-gpio@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Rafał Miłecki <rafal@...ecki.pl>
Subject: [PATCH 1/2] dt-bindings: pinctrl: convert controller description to the json-schema

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

This helps validating DTS and writing YAML files.

Signed-off-by: Rafał Miłecki <rafal@...ecki.pl>
---
 .../bindings/pinctrl/pinctrl-bindings.txt     | 41 +----------------
 .../devicetree/bindings/pinctrl/pinctrl.yaml  | 45 +++++++++++++++++++
 2 files changed, 46 insertions(+), 40 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/pinctrl/pinctrl.yaml

diff --git a/Documentation/devicetree/bindings/pinctrl/pinctrl-bindings.txt b/Documentation/devicetree/bindings/pinctrl/pinctrl-bindings.txt
index 9dae60acf950..6904072d3944 100644
--- a/Documentation/devicetree/bindings/pinctrl/pinctrl-bindings.txt
+++ b/Documentation/devicetree/bindings/pinctrl/pinctrl-bindings.txt
@@ -97,47 +97,8 @@ For example:
 	};
 
 == Pin controller devices ==
-Required properties: See the pin controller driver specific documentation
 
-Optional properties:
-#pinctrl-cells:	Number of pin control cells in addition to the index within the
-		pin controller device instance
-
-pinctrl-use-default: Boolean. Indicates that the OS can use the boot default
-		pin configuration. This allows using an OS that does not have a
-		driver for the pin controller. This property can be set either
-		globally for the pin controller or in child nodes for individual
-		pin group control.
-
-Pin controller devices should contain the pin configuration nodes that client
-devices reference.
-
-For example:
-
-	pincontroller {
-		... /* Standard DT properties for the device itself elided */
-
-		state_0_node_a {
-			...
-		};
-		state_1_node_a {
-			...
-		};
-		state_1_node_b {
-			...
-		};
-	}
-
-The contents of each of those pin configuration child nodes is defined
-entirely by the binding for the individual pin controller device. There
-exists no common standard for this content. The pinctrl framework only
-provides generic helper bindings that the pin controller driver can use.
-
-The pin configuration nodes need not be direct children of the pin controller
-device; they may be grandchildren, for example. Whether this is legal, and
-whether there is any interaction between the child and intermediate parent
-nodes, is again defined entirely by the binding for the individual pin
-controller device.
+See pinctrl.yaml
 
 == Generic pin multiplexing node content ==
 
diff --git a/Documentation/devicetree/bindings/pinctrl/pinctrl.yaml b/Documentation/devicetree/bindings/pinctrl/pinctrl.yaml
new file mode 100644
index 000000000000..d471563119a9
--- /dev/null
+++ b/Documentation/devicetree/bindings/pinctrl/pinctrl.yaml
@@ -0,0 +1,45 @@
+# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/pinctrl/pinctrl.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Pin controller device
+
+maintainers:
+  - Linus Walleij <linus.walleij@...aro.org>
+  - Rafał Miłecki <rafal@...ecki.pl>
+
+description: |
+  Pin controller devices should contain the pin configuration nodes that client
+  devices reference.
+
+  The contents of each of those pin configuration child nodes is defined
+  entirely by the binding for the individual pin controller device. There
+  exists no common standard for this content. The pinctrl framework only
+  provides generic helper bindings that the pin controller driver can use.
+
+  The pin configuration nodes need not be direct children of the pin controller
+  device; they may be grandchildren, for example. Whether this is legal, and
+  whether there is any interaction between the child and intermediate parent
+  nodes, is again defined entirely by the binding for the individual pin
+  controller device.
+
+properties:
+  $nodename:
+    pattern: "^(pinctrl|pinmux)(@[0-9a-f]+)?$"
+
+  "#pinctrl-cells":
+    description: >
+      Number of pin control cells in addition to the index within the pin
+      controller device instance.
+
+  pinctrl-use-default:
+    type: boolean
+    description: >
+      Indicates that the OS can use the boot default pin configuration. This
+      allows using an OS that does not have a driver for the pin controller.
+      This property can be set either globally for the pin controller or in
+      child nodes for individual pin group control.
+
+additionalProperties: true
-- 
2.31.1