dt-bindings: timer: Convert ti,keystone-timer to DT schema

Convert the TI Keystone Timer binding to DT schema format. It's a
straight-forward conversion.

Signed-off-by: Rob Herring (Arm) <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Daniel Lezcano <[e-mail]>

Documentation/devicetree/bindings/timer/ti,keystone-timer.txt

···
-* Device tree bindings for Texas instruments Keystone timer
-
-This document provides bindings for the 64-bit timer in the KeyStone
-architecture devices. The timer can be configured as a general-purpose 64-bit
-timer, dual general-purpose 32-bit timers. When configured as dual 32-bit
-timers, each half can operate in conjunction (chain mode) or independently
-(unchained mode) of each other.
-
-It is global timer is a free running up-counter and can generate interrupt
-when the counter reaches preset counter values.
-
-Documentation:
-https://www.ti.com/lit/ug/sprugv5a/sprugv5a.pdf
-
-Required properties:
-
-- compatible : should be "ti,keystone-timer".
-- reg : specifies base physical address and count of the registers.
-- interrupts : interrupt generated by the timer.
-- clocks : the clock feeding the timer clock.
-
-Example:
-
-timer@22f0000 {
-	compatible = "ti,keystone-timer";
-	reg = <0x022f0000 0x80>;
-	interrupts = <GIC_SPI 110 IRQ_TYPE_EDGE_RISING>;
-	clocks = <&clktimer15>;
-};

Documentation/devicetree/bindings/timer/ti,keystone-timer.yaml

···
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/ti,keystone-timer.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: TI Keystone timer
+
+maintainers:
+  - Alexander A. Klimov <[e-mail]>
+  - Ivan Khoronzhuk <[e-mail]>
+
+description: >
+  A 64-bit timer in the KeyStone architecture devices. The timer can be
+  configured as a general-purpose 64-bit timer, dual general-purpose 32-bit
+  timers. When configured as dual 32-bit timers, each half can operate in
+  conjunction (chain mode) or independently (unchained mode) of each other.
+
+  It is global timer is a free running up-counter and can generate interrupt
+  when the counter reaches preset counter values.
+
+  Documentation:
+  https://www.ti.com/lit/ug/sprugv5a/sprugv5a.pdf
+
+properties:
+  compatible:
+    const: ti,keystone-timer
+
+  reg:
+    maxItems: 1
+
+  interrupts:
+    maxItems: 1
+
+  interrupt-names:
+    items:
+      - const: irq
+
+  clocks:
+    maxItems: 1
+
+  clock-names:
+    items:
+      - const: timer
+
+required:
+  - compatible
+  - reg
+  - interrupts
+  - clocks
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/interrupt-controller/irq.h>
+
+    timer@22f0000 {
+        compatible = "ti,keystone-timer";
+        reg = <0x022f0000 0x80>;
+        interrupts = <110 IRQ_TYPE_EDGE_RISING>;
+        clocks = <&clktimer15>;
+    };