regulator: dt-bindings: qcom,wcn3990-pmu: describe PMUs on WCN39xx

WCN3990 and other similar WiFi/BT chips incorporate a simple on-chip PMU
(clearly described as such in the documentation). Provide DT schema
covering other Qualcomm WiFi/BT chips to cover these devices too.

Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
Acked-by: Mark Brown <broonie@kernel.org>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@oss.qualcomm.com>
Link: https://lore.kernel.org/r/20260106-wcn3990-pwrctl-v2-1-0386204328be@oss.qualcomm.com
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@oss.qualcomm.com>

Documentation/devicetree/bindings/regulator/qcom,wcn3990-pmu.yaml

@@ -0,0 +1,100 @@
+# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/regulator/qcom,wcn3990-pmu.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Qualcomm Technologies, Inc. WCN3990 PMU Regulators
+
+maintainers:
+  - Bartosz Golaszewski <bartosz.golaszewski@oss.qualcomm.com>
+
+description:
+  The WCN3990 package contains discrete modules for WLAN and Bluetooth. They
+  are powered by the Power Management Unit (PMU) that takes inputs from the
+  host and provides LDO outputs. This document describes this module.
+
+properties:
+  compatible:
+    enum:
+      - qcom,wcn3950-pmu
+      - qcom,wcn3988-pmu
+      - qcom,wcn3990-pmu
+      - qcom,wcn3991-pmu
+      - qcom,wcn3998-pmu
+
+  vddio-supply:
+    description: VDD_IO supply regulator handle
+
+  vddxo-supply:
+    description: VDD_XTAL supply regulator handle
+
+  vddrf-supply:
+    description: VDD_RF supply regulator handle
+
+  vddch0-supply:
+    description: chain 0 supply regulator handle
+
+  vddch1-supply:
+    description: chain 1 supply regulator handle
+
+  swctrl-gpios:
+    maxItems: 1
+    description: GPIO line indicating the state of the clock supply to the BT module
+
+  clocks:
+    maxItems: 1
+    description: Reference clock handle
+
+  regulators:
+    type: object
+    description:
+      LDO outputs of the PMU
+
+    patternProperties:
+      "^ldo[0-9]$":
+        $ref: regulator.yaml#
+        type: object
+        unevaluatedProperties: false
+
+    additionalProperties: false
+
+required:
+  - compatible
+  - regulators
+  - vddio-supply
+  - vddxo-supply
+  - vddrf-supply
+  - vddch0-supply
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/gpio/gpio.h>
+    pmu {
+        compatible = "qcom,wcn3990-pmu";
+
+        vddio-supply = <&vreg_io>;
+        vddxo-supply = <&vreg_xo>;
+        vddrf-supply = <&vreg_rf>;
+        vddch0-supply = <&vreg_ch0>;
+
+        regulators {
+            vreg_pmu_io: ldo0 {
+                regulator-name = "vreg_pmu_io";
+            };
+
+            vreg_pmu_xo: ldo1 {
+                regulator-name = "vreg_pmu_xo";
+            };
+
+            vreg_pmu_rf: ldo2 {
+                regulator-name = "vreg_pmu_rf";
+            };
+
+            vreg_pmu_ch0: ldo3 {
+                regulator-name = "vreg_pmu_ch0";
+            };
+        };
+    };