dt-bindings: power: supply: Add pm8916 VM-BMS

Qualcomm Voltage Mode BMS is a battery monitoring block in PM8916 PMIC.
Document it's DT binding.
Signed-off-by: Nikita Travkin <nikita@trvn.ru>
Reviewed-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20230915-pm8916-bms-lbc-v3-1-f30881e951a0@trvn.ruSigned-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>

Documentation/devicetree/bindings/power/supply/qcom,pm8916-bms-vm.yaml

+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/power/supply/qcom,pm8916-bms-vm.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Qualcomm Voltage Mode BMS
+
+maintainers:
+  - Nikita Travkin <nikita@trvn.ru>
+
+description:
+  Voltage Mode BMS is a hardware block found in some Qualcomm PMICs
+  such as pm8916. This block performs battery voltage monitoring.
+
+allOf:
+  - $ref: power-supply.yaml#
+
+properties:
+  compatible:
+    const: qcom,pm8916-bms-vm
+
+  reg:
+    maxItems: 1
+
+  interrupts:
+    items:
+      - description: BMS FSM left S3 mode
+      - description: BMS FSM entered S2 mode
+      - description: OCV measured in S3 mode
+      - description: OCV below threshold
+      - description: FIFO update done
+      - description: BMS FSM switched state
+
+  interrupt-names:
+    items:
+      - const: cv_leave
+      - const: cv_enter
+      - const: ocv_good
+      - const: ocv_thr
+      - const: fifo
+      - const: state_chg
+
+  monitored-battery: true
+
+  power-supplies: true
+
+required:
+  - compatible
+  - reg
+  - interrupts
+  - interrupt-names
+  - monitored-battery
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/interrupt-controller/irq.h>
+    pmic {
+      #address-cells = <1>;
+      #size-cells = <0>;
+
+      battery@4000 {
+        compatible = "qcom,pm8916-bms-vm";
+        reg = <0x4000>;
+        interrupts = <0x0 0x40 0 IRQ_TYPE_EDGE_RISING>,
+                     <0x0 0x40 1 IRQ_TYPE_EDGE_RISING>,
+                     <0x0 0x40 2 IRQ_TYPE_EDGE_RISING>,
+                     <0x0 0x40 3 IRQ_TYPE_EDGE_RISING>,
+                     <0x0 0x40 4 IRQ_TYPE_EDGE_RISING>,
+                     <0x0 0x40 5 IRQ_TYPE_EDGE_RISING>;
+        interrupt-names = "cv_leave",
+                          "cv_enter",
+                          "ocv_good",
+                          "ocv_thr",
+                          "fifo",
+                          "state_chg";
+
+        monitored-battery = <&battery>;
+        power-supplies = <&pm8916_charger>;
+      };
+    };