dt-bindings: pinctrl: convert controller description to the json-schema

This helps validating DTS and writing YAML files.

Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
Reviewed-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20211110165720.30242-1-zajec5@gmail.com
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

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 ==
 

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@linaro.org>
+  - Rafał Miłecki <rafal@milecki.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