[PATCH 2/6] dt-bindings: ptp: Document TSCSS hardware on Qualcomm QDU1000 SoC

[Imran Shaik <imran.shaik@oss.qualcomm.com>]

Add Devicetree bindings for the Timestamp Counter Subsystem (TSCSS) found
on Qualcomm QDU1000 SoC.

TSCSS is a time synchronization subsystem composed of two main blocks:
Timestamp Counter (TSC) and Event Timestamp Unit (ETU). The TSC block
provides a continuously running counter used for timekeeping, while the
ETU captures timestamps for external hardware event triggers.

Co-developed-by: Taniya Das <taniya.das@oss.qualcomm.com>
Signed-off-by: Taniya Das <taniya.das@oss.qualcomm.com>
Signed-off-by: Imran Shaik <imran.shaik@oss.qualcomm.com>
---
 .../bindings/ptp/qcom,qdu1000-tscss.yaml           | 187 +++++++++++++++++++++
 1 file changed, 187 insertions(+)

diff --git a/Documentation/devicetree/bindings/ptp/qcom,qdu1000-tscss.yaml b/Documentation/devicetree/bindings/ptp/qcom,qdu1000-tscss.yaml
new file mode 100644
index 0000000000000000000000000000000000000000..39387614ef8939b7840df2f0d5640b9e142fb4e5
--- /dev/null
+++ b/Documentation/devicetree/bindings/ptp/qcom,qdu1000-tscss.yaml
@@ -0,0 +1,187 @@
+# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/ptp/qcom,qdu1000-tscss.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Timestamp Counter Subsystem (TSCSS) on Qualcomm QDU1000 SoC
+
+maintainers:
+  - Imran Shaik <imran.shaik@oss.qualcomm.com>
+  - Taniya Das <taniya.das@oss.qualcomm.com>
+
+description: |
+  Qualcomm TSCSS is a time synchronization subsystem composed of two main
+  blocks - the Time Stamp Counter (TSC) and the Event Timestamp Unit (ETU).
+
+  The TSC block is a timestamp generator that maintains a running counter used
+  for system timekeeping, and is functional with just the AHB and counter
+  clocks.
+  The ETU block is optional and captures TSC timestamps for external
+  hardware events, each ETU slice binding a slice identifier to an external
+  event selector. Support for the ETU block requires the additional ETU
+  clock along with the per slice interrupt and slice subnodes.
+
+properties:
+  compatible:
+    const: qcom,qdu1000-tscss
+
+  reg:
+    maxItems: 1
+
+  reg-names:
+    items:
+      - const: tsc
+
+  clocks:
+    minItems: 2
+    items:
+      - description: TSC AHB configuration clock.
+      - description: TSC global counter clock.
+      - description: TSC ETU clock.
+
+  clock-names:
+    minItems: 2
+    items:
+      - const: ahb
+      - const: cntr
+      - const: etu
+
+  assigned-clocks: true
+  assigned-clock-rates: true
+
+  "#address-cells":
+    const: 2
+
+  "#size-cells":
+    const: 2
+
+  ranges: true
+
+patternProperties:
+  "^etu-slice@[0-9a-f]+$":
+    type: object
+    description: ETU slice configuration
+    properties:
+      reg:
+        maxItems: 1
+
+      pinctrl-0: true
+
+      pinctrl-names:
+        items:
+          - const: default
+
+      interrupts:
+        description: Per slice interrupt generated by ETU based on external event trigger.
+        maxItems: 1
+
+      qcom,etu-event-sel:
+        description: Event selection value for this slice.
+        $ref: /schemas/types.yaml#/definitions/uint32
+
+      qcom,etu-slice:
+        description: ETU slice identifier.
+        $ref: /schemas/types.yaml#/definitions/uint32
+
+    required:
+      - reg
+      - interrupts
+      - qcom,etu-event-sel
+      - qcom,etu-slice
+      - pinctrl-0
+      - pinctrl-names
+    unevaluatedProperties: false
+
+required:
+  - compatible
+  - reg
+  - reg-names
+  - clocks
+  - clock-names
+
+allOf:
+  - if:
+      properties:
+        clock-names:
+          contains:
+            const: etu
+    then:
+      properties:
+        clocks:
+          minItems: 3
+        clock-names:
+          minItems: 3
+      required:
+        - "#address-cells"
+        - "#size-cells"
+        - ranges
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/clock/qcom,qdu1000-gcc.h>
+
+    soc {
+      #address-cells = <2>;
+      #size-cells = <2>;
+
+      tscss@1da0000 {
+        compatible = "qcom,qdu1000-tscss";
+        reg = <0x0 0x01da0000 0x0 0x2000>;
+        reg-names = "tsc";
+
+        clocks = <&gcc GCC_TSC_CFG_AHB_CLK>,
+                 <&gcc GCC_TSC_CNTR_CLK>;
+        clock-names = "ahb", "cntr";
+        assigned-clocks = <&gcc GCC_TSC_CNTR_CLK>;
+        assigned-clock-rates = <500000000>;
+      };
+    };
+
+  - |
+    #include <dt-bindings/clock/qcom,qdu1000-gcc.h>
+    #include <dt-bindings/interrupt-controller/arm-gic.h>
+
+    soc {
+      #address-cells = <2>;
+      #size-cells = <2>;
+
+      tscss@1da0000 {
+        compatible = "qcom,qdu1000-tscss";
+        reg = <0x0 0x01da0000 0x0 0x2000>;
+        reg-names = "tsc";
+        #address-cells = <2>;
+        #size-cells = <2>;
+        ranges;
+
+        clocks = <&gcc GCC_TSC_CFG_AHB_CLK>,
+                 <&gcc GCC_TSC_CNTR_CLK>,
+                 <&gcc GCC_TSC_ETU_CLK>;
+        clock-names = "ahb", "cntr", "etu";
+
+        assigned-clocks = <&gcc GCC_TSC_CNTR_CLK>,
+                          <&gcc GCC_TSC_ETU_CLK>;
+        assigned-clock-rates = <500000000>, <500000000>;
+
+        etu-slice@1db1000 {
+          reg = <0x0 0x01db1000 0x0 0x1000>;
+          interrupts = <GIC_SPI 329 IRQ_TYPE_EDGE_RISING>;
+          pinctrl-0 = <&cci_timer0>;
+          pinctrl-names = "default";
+          qcom,etu-event-sel = <1>;
+          qcom,etu-slice = <1>;
+        };
+
+        etu-slice@1db2000 {
+          reg = <0x0 0x01db2000 0x0 0x1000>;
+          interrupts = <GIC_SPI 330 IRQ_TYPE_EDGE_RISING>;
+          pinctrl-0 = <&cci_timer1>;
+          pinctrl-names = "default";
+          qcom,etu-event-sel = <2>;
+          qcom,etu-slice = <2>;
+        };
+      };
+    };
+...

-- 
2.34.1