dt-bindings: clocks: atmel,at91rm9200-pmc: convert to yaml

Convert Atmel PMC documentation to yaml. Along with it clock names
were adapted according to the current available device trees as
different controller versions accept different clock (some of them
have 3 clocks as input, some has 2 clocks as inputs and some with 2
input clocks uses different clock names).

Signed-off-by: Claudiu Beznea <[e-mail]>
Reviewed-by: Conor Dooley <[e-mail]>
Reviewed-by: Krzysztof Kozlowski <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]

Documentation/devicetree/bindings/clock/at91-clock.txt

···
 		#clock-cells = <0>;
 	};
 
-Power Management Controller (PMC):
-
-Required properties:
-- compatible : shall be "atmel,<chip>-pmc", "syscon" or
-	"microchip,sam9x60-pmc"
-	<chip> can be: at91rm9200, at91sam9260, at91sam9261,
-	at91sam9263, at91sam9g45, at91sam9n12, at91sam9rl, at91sam9g15,
-	at91sam9g25, at91sam9g35, at91sam9x25, at91sam9x35, at91sam9x5,
-	sama5d2, sama5d3 or sama5d4.
-- #clock-cells : from common clock binding; shall be set to 2. The first entry
-  is the type of the clock (core, system, peripheral or generated) and the
-  second entry its index as provided by the datasheet
-- clocks : Must contain an entry for each entry in clock-names.
-- clock-names: Must include the following entries: "slow_clk", "main_xtal"
-
-Optional properties:
-- atmel,osc-bypass : boolean property. Set this when a clock signal is directly
-  provided on XIN.
-
-For example:
-	pmc: pmc@f0018000 {
-		compatible = "atmel,sama5d4-pmc", "syscon";
-		reg = <0xf0018000 0x120>;
-		interrupts = <1 IRQ_TYPE_LEVEL_HIGH 7>;
-		#clock-cells = <2>;
-		clocks = <&clk32k>, <&main_xtal>;
-		clock-names = "slow_clk", "main_xtal";
-	};

Documentation/devicetree/bindings/clock/atmel,at91rm9200-pmc.yaml

···
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/clock/atmel,at91rm9200-pmc.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Atmel Power Management Controller (PMC)
+
+maintainers:
+  - Claudiu Beznea <[e-mail]>
+
+description:
+  The power management controller optimizes power consumption by controlling all
+  system and user peripheral clocks. The PMC enables/disables the clock inputs
+  to many of the peripherals and to the processor.
+
+properties:
+  compatible:
+    oneOf:
+      - items:
+          - const: atmel,at91sam9g20-pmc
+          - const: atmel,at91sam9260-pmc
+          - const: syscon
+      - items:
+          - enum:
+              - atmel,at91sam9g15-pmc
+              - atmel,at91sam9g25-pmc
+              - atmel,at91sam9g35-pmc
+              - atmel,at91sam9x25-pmc
+              - atmel,at91sam9x35-pmc
+          - const: atmel,at91sam9x5-pmc
+          - const: syscon
+      - items:
+          - enum:
+              - atmel,at91rm9200-pmc
+              - atmel,at91sam9260-pmc
+              - atmel,at91sam9g45-pmc
+              - atmel,at91sam9n12-pmc
+              - atmel,at91sam9rl-pmc
+              - atmel,at91sam9x5-pmc
+              - atmel,sama5d2-pmc
+              - atmel,sama5d3-pmc
+              - atmel,sama5d4-pmc
+              - microchip,sam9x60-pmc
+              - microchip,sama7g5-pmc
+          - const: syscon
+
+  reg:
+    maxItems: 1
+
+  interrupts:
+    maxItems: 1
+
+  "#clock-cells":
+    description: |
+      - 1st cell is the clock type, one of PMC_TYPE_CORE, PMC_TYPE_SYSTEM,
+        PMC_TYPE_PERIPHERAL, PMC_TYPE_GCK, PMC_TYPE_PROGRAMMABLE (as defined
+        in <dt-bindings/clock/at91.h>)
+      - 2nd cell is the clock identifier as defined in <dt-bindings/clock/at91.h
+        (for core clocks) or as defined in datasheet (for system, peripheral,
+        gck and programmable clocks).
+    const: 2
+
+  clocks:
+    minItems: 2
+    maxItems: 3
+
+  clock-names:
+    minItems: 2
+    maxItems: 3
+
+  atmel,osc-bypass:
+    description: set when a clock signal is directly provided on XIN
+    type: boolean
+
+required:
+  - compatible
+  - reg
+  - interrupts
+  - "#clock-cells"
+  - clocks
+  - clock-names
+
+allOf:
+  - if:
+      properties:
+        compatible:
+          contains:
+            enum:
+              - microchip,sam9x60-pmc
+              - microchip,sama7g5-pmc
+    then:
+      properties:
+        clocks:
+          minItems: 3
+          maxItems: 3
+        clock-names:
+          items:
+            - const: td_slck
+            - const: md_slck
+            - const: main_xtal
+
+  - if:
+      properties:
+        compatible:
+          contains:
+            enum:
+              - atmel,at91rm9200-pmc
+              - atmel,at91sam9260-pmc
+              - atmel,at91sam9g20-pmc
+    then:
+      properties:
+        clocks:
+          minItems: 2
+          maxItems: 2
+        clock-names:
+          items:
+            - const: slow_xtal
+            - const: main_xtal
+
+  - if:
+      properties:
+        compatible:
+          contains:
+            enum:
+              - atmel,sama5d2-pmc
+              - atmel,sama5d3-pmc
+              - atmel,sama5d4-pmc
+    then:
+      properties:
+        clocks:
+          minItems: 2
+          maxItems: 2
+        clock-names:
+          items:
+            - const: slow_clk
+            - const: main_xtal
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/interrupt-controller/irq.h>
+
+    pmc: clock-controller@f0018000 {
+        compatible = "atmel,sama5d4-pmc", "syscon";
+        reg = <0xf0018000 0x120>;
+        interrupts = <1 IRQ_TYPE_LEVEL_HIGH 7>;
+        #clock-cells = <2>;
+        clocks = <&clk32k>, <&main_xtal>;
+        clock-names = "slow_clk", "main_xtal";
+    };
+
+...