dt-bindings: convert spmi.txt to spmi.yaml

Convert the SPMI bus documentation to JSON/yaml.
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Link: https://lore.kernel.org/r/ee4c4ca9f29a39f6af772b3a526a996176499da3.1598415179.git.mchehab+huawei@kernel.org
[robh: Correct maintainer, unit-address should be hex]
Signed-off-by: Rob Herring <robh@kernel.org>

Documentation/devicetree/bindings/mfd/qcom,spmi-pmic.txt

@@ -37,7 +37,7 @@ Required properties:
                    or generalized "qcom,spmi-pmic".
 - reg:             Specifies the SPMI USID slave address for this device.
                    For more information see:
-                   Documentation/devicetree/bindings/spmi/spmi.txt
+                   Documentation/devicetree/bindings/spmi/spmi.yaml
 
 Required properties for peripheral child nodes:
 - compatible:      Should contain "qcom,xxx", where "xxx" is a peripheral name.

Documentation/devicetree/bindings/spmi/qcom,spmi-pmic-arb.txt

@@ -7,8 +7,8 @@ devices to control a single SPMI master.
 The PMIC Arbiter can also act as an interrupt controller, providing interrupts
 to slave devices.
 
-See spmi.txt for the generic SPMI controller binding requirements for child
-nodes.
+See Documentation/devicetree/bindings/spmi/spmi.yaml for the generic SPMI
+controller binding requirements for child nodes.
 
 See Documentation/devicetree/bindings/interrupt-controller/interrupts.txt for
 generic interrupt controller binding documentation.

Documentation/devicetree/bindings/spmi/spmi.txt

-System Power Management Interface (SPMI) Controller
-
-This document defines a generic set of bindings for use by SPMI controllers.  A
-controller is modelled in device tree as a node with zero or more child nodes,
-each representing a unique slave on the bus.
-
-Required properties:
-- #address-cells : must be set to 2
-- #size-cells : must be set to 0
-
-Child nodes:
-
-An SPMI controller node can contain zero or more child nodes representing slave
-devices on the bus.  Child 'reg' properties are specified as an address, type
-pair.  The address must be in the range 0-15 (4 bits).  The type must be one of
-SPMI_USID (0) or SPMI_GSID (1) for Unique Slave ID or Group Slave ID respectively.
-These are the identifiers "statically assigned by the system integrator", as
-per the SPMI spec.
-
-Each child node must have one and only one 'reg' entry of type SPMI_USID.
-
-#include <dt-bindings/spmi/spmi.h>
-
-	spmi@.. {
-		compatible = "...";
-		reg = <...>;
-
-		#address-cells = <2>;
-		#size-cells = <0>;
-
-		child@0 {
-			compatible = "...";
-			reg = <0 SPMI_USID>;
-		};
-
-		child@7 {
-			compatible = "...";
-			reg = <7 SPMI_USID
-			       3 SPMI_GSID>;
-		};
-	};

Documentation/devicetree/bindings/spmi/spmi.yaml

+# SPDX-License-Identifier: GPL-2.0
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/spmi/spmi.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: System Power Management Interface (SPMI) Controller
+
+maintainers:
+  - Stephen Boyd <sboyd@kernel.org>
+
+description: |
+  The System Power Management (SPMI) controller is a 2-wire bus defined
+  by the MIPI Alliance for power management control to be used on SoC designs.
+
+  SPMI controllers are modelled in device tree using a generic set of
+  bindings defined here, plus any bus controller specific properties, if
+  needed.
+
+  Each SPMI controller has zero or more child nodes (up to 16 ones), each
+  one representing an unique slave at the bus.
+
+properties:
+  $nodename:
+    pattern: "^spmi@.*"
+
+  reg:
+    maxItems: 1
+
+  "#address-cells":
+    const: 2
+
+  "#size-cells":
+    const: 0
+
+patternProperties:
+  "@[0-9a-f]$":
+    description: up to 16 child PMIC nodes
+    type: object
+
+    properties:
+      reg:
+        minItems: 1
+        maxItems: 2
+        items:
+          - minimum: 0
+            maximum: 0xf
+          - enum: [ 0 ]
+            description: |
+              0 means user ID address. 1 is reserved for group ID address.
+
+    required:
+      - reg
+
+required:
+  - reg
+
+examples:
+  - |
+    #include <dt-bindings/spmi/spmi.h>
+
+    spmi@0 {
+      reg = <0 0>;
+
+      #address-cells = <2>;
+      #size-cells = <0>;
+
+      child@0 {
+        reg = <0 SPMI_USID>;
+      };
+
+      child@7 {
+        reg = <7 SPMI_USID>;
+      };
+    };