dt-bindings: arm: convert vexpress-config to DT schema

The Arm Versatile Express system features a bridge device that provides
access to various smaller devices like clocks, reset gates and various
sensors.

Extract the second half of the informal vexpress-sysreg.txt binding and
make it proper DT schema compliant. This makes the old .txt binding
redundant, so remove it.

This describes both the actual parent configuration bridge, as well as
all the possible children devices.
Signed-off-by: Andre Przywara <andre.przywara@arm.com>
Signed-off-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20220506140533.3566431-8-andre.przywara@arm.com

Documentation/devicetree/bindings/arm/vexpress-config.yaml

+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/arm/vexpress-config.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: ARM Versatile Express configuration bus bindings
+
+maintainers:
+  - Andre Przywara <andre.przywara@arm.com>
+
+description:
+  This is a system control register block, acting as a bridge to the
+  platform's configuration bus via "system control" interface, addressing
+  devices with site number, position in the board stack, config controller,
+  function and device numbers - see motherboard's TRM for more details.
+
+properties:
+  compatible:
+    const: arm,vexpress,config-bus
+
+  arm,vexpress,config-bridge:
+    $ref: /schemas/types.yaml#/definitions/phandle
+    description:
+      Phandle to the sysreg node.
+
+  muxfpga:
+    type: object
+    properties:
+      compatible:
+        const: arm,vexpress-muxfpga
+
+      arm,vexpress-sysreg,func:
+        description: FPGA specifier
+        $ref: /schemas/types.yaml#/definitions/uint32-array
+        items:
+          - const: 7
+          - description: device number
+
+    additionalProperties: false
+    required:
+      - compatible
+      - arm,vexpress-sysreg,func
+
+  shutdown:
+    type: object
+    properties:
+      compatible:
+        const: arm,vexpress-shutdown
+
+      arm,vexpress-sysreg,func:
+        description: shutdown identifier
+        $ref: /schemas/types.yaml#/definitions/uint32-array
+        items:
+          - const: 8
+          - description: device number
+
+    additionalProperties: false
+    required:
+      - compatible
+      - arm,vexpress-sysreg,func
+
+  reboot:
+    type: object
+    properties:
+      compatible:
+        const: arm,vexpress-reboot
+
+      arm,vexpress-sysreg,func:
+        description: reboot identifier
+        $ref: /schemas/types.yaml#/definitions/uint32-array
+        items:
+          - const: 9
+          - description: device number
+
+    additionalProperties: false
+    required:
+      - compatible
+      - arm,vexpress-sysreg,func
+
+  dvimode:
+    type: object
+    properties:
+      compatible:
+        const: arm,vexpress-dvimode
+
+      arm,vexpress-sysreg,func:
+        description: DVI mode identifier
+        $ref: /schemas/types.yaml#/definitions/uint32-array
+        items:
+          - const: 11
+          - description: device number
+
+    additionalProperties: false
+    required:
+      - compatible
+      - arm,vexpress-sysreg,func
+
+additionalProperties: false
+
+required:
+  - compatible
+  - arm,vexpress,config-bridge
+
+patternProperties:
+  'clk[0-9]*$':
+    type: object
+    description:
+      clocks
+
+    properties:
+      compatible:
+        const: arm,vexpress-osc
+
+      arm,vexpress-sysreg,func:
+        description: clock specifier
+        $ref: /schemas/types.yaml#/definitions/uint32-array
+        items:
+          - const: 1
+          - description: clock number
+
+      freq-range:
+        $ref: /schemas/types.yaml#/definitions/uint32-array
+        items:
+          - description: minimal clock frequency
+          - description: maximum clock frequency
+
+      "#clock-cells":
+        const: 0
+
+      clock-output-names:
+        maxItems: 1
+
+    additionalProperties: false
+    required:
+      - compatible
+      - arm,vexpress-sysreg,func
+      - "#clock-cells"
+
+  "^volt-.+$":
+    $ref: /schemas/regulator/regulator.yaml#
+    properties:
+      compatible:
+        const: arm,vexpress-volt
+
+      arm,vexpress-sysreg,func:
+        description: regulator specifier
+        $ref: /schemas/types.yaml#/definitions/uint32-array
+        items:
+          - const: 2
+          - description: device number
+
+      label:
+        maxItems: 1
+
+    unevaluatedProperties: false
+    required:
+      - compatible
+      - arm,vexpress-sysreg,func
+
+  "^amp-.+$":
+    type: object
+    properties:
+      compatible:
+        const: arm,vexpress-amp
+
+      arm,vexpress-sysreg,func:
+        description: current sensor identifier
+        $ref: /schemas/types.yaml#/definitions/uint32-array
+        items:
+          - const: 3
+          - description: device number
+
+      label:
+        maxItems: 1
+
+    additionalProperties: false
+    required:
+      - compatible
+      - arm,vexpress-sysreg,func
+
+  "^temp-.+$":
+    type: object
+    properties:
+      compatible:
+        const: arm,vexpress-temp
+
+      arm,vexpress-sysreg,func:
+        description: temperature sensor identifier
+        $ref: /schemas/types.yaml#/definitions/uint32-array
+        items:
+          - const: 4
+          - description: device number
+
+      label:
+        maxItems: 1
+
+    additionalProperties: false
+    required:
+      - compatible
+      - arm,vexpress-sysreg,func
+
+  "^reset[0-9]*$":
+    type: object
+    properties:
+      compatible:
+        const: arm,vexpress-reset
+
+      arm,vexpress-sysreg,func:
+        description: reset specifier
+        $ref: /schemas/types.yaml#/definitions/uint32-array
+        items:
+          - const: 5
+          - description: reset device number
+
+    additionalProperties: false
+    required:
+      - compatible
+      - arm,vexpress-sysreg,func
+
+  "^power-.+$":
+    type: object
+    properties:
+      compatible:
+        const: arm,vexpress-power
+
+      arm,vexpress-sysreg,func:
+        description: power sensor identifier
+        $ref: /schemas/types.yaml#/definitions/uint32-array
+        items:
+          - const: 12
+          - description: device number
+
+      label:
+        maxItems: 1
+
+    additionalProperties: false
+    required:
+      - compatible
+      - arm,vexpress-sysreg,func
+
+  "^energy(-.+)?$":
+    type: object
+    properties:
+      compatible:
+        const: arm,vexpress-energy
+
+      arm,vexpress-sysreg,func:
+        description: energy sensor identifier
+        $ref: /schemas/types.yaml#/definitions/uint32-array
+        oneOf:
+          - items:
+              - const: 13
+              - description: device number
+          - items:
+              - const: 13
+              - description: device number
+              - const: 13
+              - description: second device number
+
+      label:
+        maxItems: 1
+
+    additionalProperties: false
+    required:
+      - compatible
+      - arm,vexpress-sysreg,func
+
+examples:
+  - |
+    mcc {
+        compatible = "arm,vexpress,config-bus";
+        arm,vexpress,config-bridge = <&v2m_sysreg>;
+
+        clk0 {
+            compatible = "arm,vexpress-osc";
+            arm,vexpress-sysreg,func = <1 0>;
+            #clock-cells = <0>;
+        };
+
+        energy {
+            compatible = "arm,vexpress-energy";
+            arm,vexpress-sysreg,func = <13 0>, <13 1>;
+        };
+    };

Documentation/devicetree/bindings/arm/vexpress-sysreg.txt

-ARM Versatile Express system registers
---------------------------------------
-
-This is a system control registers block, providing multiple low level
-platform functions like board detection and identification, software
-interrupt generation, MMC and NOR Flash control etc.
-
-Required node properties:
-- compatible value : = "arm,vexpress,sysreg";
-- reg : physical base address and the size of the registers window
-
-Deprecated properties, replaced by GPIO subnodes (see below):
-- gpio-controller : specifies that the node is a GPIO controller
-- #gpio-cells : size of the GPIO specifier, should be 2:
-  - first cell is the pseudo-GPIO line number:
-    0 - MMC CARDIN
-    1 - MMC WPROT
-    2 - NOR FLASH WPn
-  - second cell can take standard GPIO flags (currently ignored).
-
-Control registers providing pseudo-GPIO lines must be represented
-by subnodes, each of them requiring the following properties:
-- compatible value : one of
-			"arm,vexpress-sysreg,sys_led"
-			"arm,vexpress-sysreg,sys_mci"
-			"arm,vexpress-sysreg,sys_flash"
-- gpio-controller : makes the node a GPIO controller
-- #gpio-cells : size of the GPIO specifier, must be 2:
-  - first cell is the function number:
-    - for sys_led : 0..7 = LED 0..7
-    - for sys_mci : 0 = MMC CARDIN, 1 = MMC WPROT
-    - for sys_flash : 0 = NOR FLASH WPn
-  - second cell can take standard GPIO flags (currently ignored).
-
-Example:
-	v2m_sysreg: sysreg@10000000 {
- 		compatible = "arm,vexpress-sysreg";
- 		reg = <0x10000000 0x1000>;
-
-		v2m_led_gpios: sys_led@8 {
-			compatible = "arm,vexpress-sysreg,sys_led";
-			gpio-controller;
-			#gpio-cells = <2>;
-		};
-
-		v2m_mmc_gpios: sys_mci@48 {
-			compatible = "arm,vexpress-sysreg,sys_mci";
-			gpio-controller;
-			#gpio-cells = <2>;
-		};
-
-		v2m_flash_gpios: sys_flash@4c {
-			compatible = "arm,vexpress-sysreg,sys_flash";
-			gpio-controller;
-			#gpio-cells = <2>;
-		};
- 	};
-
-This block also can also act a bridge to the platform's configuration
-bus via "system control" interface, addressing devices with site number,
-position in the board stack, config controller, function and device
-numbers - see motherboard's TRM for more details. All configuration
-controller accessible via this interface must reference the sysreg
-node via "arm,vexpress,config-bridge" phandle and define appropriate
-topology properties - see main vexpress node documentation for more
-details. Each child of such node describes one function and must
-define the following properties:
-- compatible value : must be one of (corresponding to the TRM):
-	"arm,vexpress-amp"
-	"arm,vexpress-dvimode"
-	"arm,vexpress-energy"
-	"arm,vexpress-muxfpga"
-	"arm,vexpress-osc"
-	"arm,vexpress-power"
-	"arm,vexpress-reboot"
-	"arm,vexpress-reset"
-	"arm,vexpress-scc"
-	"arm,vexpress-shutdown"
-	"arm,vexpress-temp"
-	"arm,vexpress-volt"
-- arm,vexpress-sysreg,func : must contain a set of two cells long groups:
-  - first cell of each group defines the function number
-    (eg. 1 for clock generator, 2 for voltage regulators etc.)
-  - second cell of each group defines device number (eg. osc 0,
-    osc 1 etc.)
-  - some functions (eg. energy meter, with its 64 bit long counter)
-    are using more than one function/device number pair
-
-Example:
-	mcc {
-		compatible = "arm,vexpress,config-bus";
-		arm,vexpress,config-bridge = <&v2m_sysreg>;
-
-		osc@0 {
-			compatible = "arm,vexpress-osc";
-			arm,vexpress-sysreg,func = <1 0>;
-		};
-
-		energy@0 {
-			compatible = "arm,vexpress-energy";
-			arm,vexpress-sysreg,func = <13 0>, <13 1>;
-		};
-	};