[PATCH v3 1/2] dt-bindings: perf: Support uncore NI-700 PMU

[JiaLong.Yang]

Add file corresponding to hx_arm_ni.c introducing ARM NI-700 PMU
driver for HX.

Signed-off-by: JiaLong.Yang <jialong.yang at shingroup.cn>
---
v1 --> v2:
1. Submit dt-bindings file Seperately.
2. Do some check:
   ~ #: make dt_binding_check DT_SCHEMA_FILES=perf
   LINT    Documentation/devicetree/bindings
   CHKDT   Documentation/devicetree/bindings/processed-schema.json
   SCHEMA  Documentation/devicetree/bindings/processed-schema.json
   DTEX    Documentation/devicetree/bindings/perf/hx,c2000-arm-ni.example.dts
   DTC_CHK Documentation/devicetree/bindings/perf/hx,c2000-arm-ni.example.dtb

v2 --> v3:
1. Change vendor from hx to hexin.
2. Submit driver and dt-bindings files together.
3. Delete pccs-id property. Use alias-id to do this.
4. There are at least one interrupt line for the hardware and driver
   for handling counter overflow.
5. Use 4 spaces for example indentation in yaml file.

 .../bindings/perf/hexin,c2000-arm-ni.yaml     | 51 +++++++++++++++++++
 MAINTAINERS                                   |  6 +++
 2 files changed, 57 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/perf/hexin,c2000-arm-ni.yaml

diff --git a/Documentation/devicetree/bindings/perf/hexin,c2000-arm-ni.yaml b/Documentation/devicetree/bindings/perf/hexin,c2000-arm-ni.yaml
new file mode 100644
index 000000000000..b2641ee84d60
--- /dev/null
+++ b/Documentation/devicetree/bindings/perf/hexin,c2000-arm-ni.yaml
@@ -0,0 +1,51 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/perf/hexin,c2000-arm-ni.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: HX-C2000 NI (Network-on-chip Interconnect) Performance Monitors
+
+maintainers:
+  - Jialong Yang <jialong.yang at shingroup.cn>
+
+properties:
+  compatible:
+    enum:
+      - hexin,c2000-arm-ni
+
+  reg:
+    items:
+      - description: Physical address of the base (PERIPHBASE) and
+          size of the whole NI configuration address space.
+
+  interrupts:
+    minItems: 1
+    items:
+      - description: Overflow interrupt for clock domain 0
+      - description: Overflow interrupt for clock domain 1
+      - description: Overflow interrupt for clock domain 2
+      - description: Generally, one interrupt line for one PMU. But this also
+          support one interrupt line for a NI if merged.
+
+required:
+  - compatible
+  - reg
+  - interrupts
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/interrupt-controller/arm-gic.h>
+    #include <dt-bindings/interrupt-controller/irq.h>
+
+    aliases {
+        ni-pmu0 = &nipmu0;
+    };
+
+    nipmu0: pmu at 23ff0000 {
+        compatible = "hexin,c2000-arm-ni";
+        reg = <0x2b420000 0x10000>;
+        interrupts = <GIC_SPI 80 IRQ_TYPE_LEVEL_HIGH>;
+    };
diff --git a/MAINTAINERS b/MAINTAINERS
index 4f298c4187fb..4b664cec98a7 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -18890,6 +18890,12 @@ L:	linux-riscv at lists.infradead.org
 S:	Maintained
 F:	arch/riscv/boot/dts/thead/
 
+HX ARM-NI-700 PMU DRIVERS
+M:	Jialong Yang <jialong.yang at shingroup.cn>
+S:	Supported
+F:	Documentation/devicetree/bindings/perf/hexin,c2000-arm-ni.yaml
+F:	drivers/perf/hx_arm_ni.c
+
 RNBD BLOCK DRIVERS
 M:	Md. Haris Iqbal <haris.iqbal at ionos.com>
 M:	Jack Wang <jinpu.wang at ionos.com>
-- 
2.25.1