dt-bindings: arm: Convert PMU binding to json-schema

Convert ARM PMU binding to DT schema format using json-schema.

Cc: Will Deacon <will.deacon@arm.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: linux-arm-kernel@lists.infradead.org
Cc: devicetree@vger.kernel.org
Signed-off-by: Rob Herring <robh@kernel.org>
Signed-off-by: Will Deacon <will.deacon@arm.com>

Documentation/devicetree/bindings/arm/pmu.txt

-* ARM Performance Monitor Units
-
-ARM cores often have a PMU for counting cpu and cache events like cache misses
-and hits. The interface to the PMU is part of the ARM ARM. The ARM PMU
-representation in the device tree should be done as under:-
-
-Required properties:
-
-- compatible : should be one of
-	"apm,potenza-pmu"
-	"arm,armv8-pmuv3"
-	"arm,cortex-a73-pmu"
-	"arm,cortex-a72-pmu"
-	"arm,cortex-a57-pmu"
-	"arm,cortex-a53-pmu"
-	"arm,cortex-a35-pmu"
-	"arm,cortex-a17-pmu"
-	"arm,cortex-a15-pmu"
-	"arm,cortex-a12-pmu"
-	"arm,cortex-a9-pmu"
-	"arm,cortex-a8-pmu"
-	"arm,cortex-a7-pmu"
-	"arm,cortex-a5-pmu"
-	"arm,arm11mpcore-pmu"
-	"arm,arm1176-pmu"
-	"arm,arm1136-pmu"
-	"brcm,vulcan-pmu"
-	"cavium,thunder-pmu"
-	"qcom,scorpion-pmu"
-	"qcom,scorpion-mp-pmu"
-	"qcom,krait-pmu"
-- interrupts : 1 combined interrupt or 1 per core. If the interrupt is a per-cpu
-               interrupt (PPI) then 1 interrupt should be specified.
-
-Optional properties:
-
-- interrupt-affinity : When using SPIs, specifies a list of phandles to CPU
-                       nodes corresponding directly to the affinity of
-		       the SPIs listed in the interrupts property.
-
-                       When using a PPI, specifies a list of phandles to CPU
-		       nodes corresponding to the set of CPUs which have
-		       a PMU of this type signalling the PPI listed in the
-		       interrupts property, unless this is already specified
-		       by the PPI interrupt specifier itself (in which case
-		       the interrupt-affinity property shouldn't be present).
-
-                       This property should be present when there is more than
-		       a single SPI.
-
-
-- qcom,no-pc-write : Indicates that this PMU doesn't support the 0xc and 0xd
-                     events.
-
-- secure-reg-access : Indicates that the ARMv7 Secure Debug Enable Register
-		      (SDER) is accessible. This will cause the driver to do
-		      any setup required that is only possible in ARMv7 secure
-		      state. If not present the ARMv7 SDER will not be touched,
-		      which means the PMU may fail to operate unless external
-		      code (bootloader or security monitor) has performed the
-		      appropriate initialisation. Note that this property is
-		      not valid for non-ARMv7 CPUs or ARMv7 CPUs booting Linux
-		      in Non-secure state.
-
-Example:
-
-pmu {
-        compatible = "arm,cortex-a9-pmu";
-        interrupts = <100 101>;
-};

Documentation/devicetree/bindings/arm/pmu.yaml

+# SPDX-License-Identifier: GPL-2.0
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/arm/pmu.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: ARM Performance Monitor Units
+
+maintainers:
+  - Mark Rutland <mark.rutland@arm.com>
+  - Will Deacon <will.deacon@arm.com>
+
+description: |+
+  ARM cores often have a PMU for counting cpu and cache events like cache misses
+  and hits. The interface to the PMU is part of the ARM ARM. The ARM PMU
+  representation in the device tree should be done as under:-
+
+properties:
+  compatible:
+    items:
+      - enum:
+          - apm,potenza-pmu
+          - arm,armv8-pmuv3
+          - arm,cortex-a73-pmu
+          - arm,cortex-a72-pmu
+          - arm,cortex-a57-pmu
+          - arm,cortex-a53-pmu
+          - arm,cortex-a35-pmu
+          - arm,cortex-a17-pmu
+          - arm,cortex-a15-pmu
+          - arm,cortex-a12-pmu
+          - arm,cortex-a9-pmu
+          - arm,cortex-a8-pmu
+          - arm,cortex-a7-pmu
+          - arm,cortex-a5-pmu
+          - arm,arm11mpcore-pmu
+          - arm,arm1176-pmu
+          - arm,arm1136-pmu
+          - brcm,vulcan-pmu
+          - cavium,thunder-pmu
+          - qcom,scorpion-pmu
+          - qcom,scorpion-mp-pmu
+          - qcom,krait-pmu
+
+  interrupts:
+    # Don't know how many CPUs, so no constraints to specify
+    description: 1 per-cpu interrupt (PPI) or 1 interrupt per core.
+
+  interrupt-affinity:
+    $ref: /schemas/types.yaml#/definitions/phandle-array
+    description:
+      When using SPIs, specifies a list of phandles to CPU
+      nodes corresponding directly to the affinity of
+      the SPIs listed in the interrupts property.
+
+      When using a PPI, specifies a list of phandles to CPU
+      nodes corresponding to the set of CPUs which have
+      a PMU of this type signalling the PPI listed in the
+      interrupts property, unless this is already specified
+      by the PPI interrupt specifier itself (in which case
+      the interrupt-affinity property shouldn't be present).
+
+      This property should be present when there is more than
+      a single SPI.
+
+  qcom,no-pc-write:
+    type: boolean
+    description:
+      Indicates that this PMU doesn't support the 0xc and 0xd events.
+
+  secure-reg-access:
+    type: boolean
+    description:
+      Indicates that the ARMv7 Secure Debug Enable Register
+      (SDER) is accessible. This will cause the driver to do
+      any setup required that is only possible in ARMv7 secure
+      state. If not present the ARMv7 SDER will not be touched,
+      which means the PMU may fail to operate unless external
+      code (bootloader or security monitor) has performed the
+      appropriate initialisation. Note that this property is
+      not valid for non-ARMv7 CPUs or ARMv7 CPUs booting Linux
+      in Non-secure state.
+
+required:
+  - compatible
+
+...

MAINTAINERS

@@ -1159,7 +1159,7 @@ F:	arch/arm*/include/asm/hw_breakpoint.h
 F:	arch/arm*/include/asm/perf_event.h
 F:	drivers/perf/*
 F:	include/linux/perf/arm_pmu.h
-F:	Documentation/devicetree/bindings/arm/pmu.txt
+F:	Documentation/devicetree/bindings/arm/pmu.yaml
 F:	Documentation/devicetree/bindings/perf/
 
 ARM PORT