dt-bindings: power: supply: qcom,pmi8998-charger: add bindings for smb2 driver

Add devicetree bindings for the Qualcomm PMI8998/PM660 SMB2 charger
driver.
Signed-off-by: Caleb Connolly <caleb.connolly@linaro.org>
Reviewed-by: Conor Dooley <conor.dooley@microchip.com>
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>

Documentation/devicetree/bindings/mfd/qcom,spmi-pmic.yaml

@@ -133,6 +133,7 @@ patternProperties:
     oneOf:
       - $ref: /schemas/power/supply/qcom,pm8941-charger.yaml#
       - $ref: /schemas/power/supply/qcom,pm8941-coincell.yaml#
+      - $ref: /schemas/power/supply/qcom,pmi8998-charger.yaml#
 
   "gpio@[0-9a-f]+$":
     type: object

Documentation/devicetree/bindings/power/supply/qcom,pmi8998-charger.yaml

+# SPDX-License-Identifier: GPL-2.0 OR BSD-2-Clause
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/power/supply/qcom,pmi8998-charger.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Qualcomm PMI8998/PM660 Switch-Mode Battery Charger "2"
+
+maintainers:
+  - Caleb Connolly <caleb.connolly@linaro.org>
+
+properties:
+  compatible:
+    enum:
+      - qcom,pmi8998-charger
+      - qcom,pm660-charger
+
+  reg:
+    maxItems: 1
+
+  interrupts:
+    maxItems: 4
+
+  interrupt-names:
+    items:
+      - const: usb-plugin
+      - const: bat-ov
+      - const: wdog-bark
+      - const: usbin-icl-change
+
+  io-channels:
+    items:
+      - description: USB in current in uA
+      - description: USB in voltage in uV
+
+  io-channel-names:
+    items:
+      - const: usbin_i
+      - const: usbin_v
+
+  monitored-battery:
+    description: phandle to the simple-battery node
+    $ref: /schemas/types.yaml#/definitions/phandle
+
+required:
+  - compatible
+  - reg
+  - interrupts
+  - interrupt-names
+  - io-channels
+  - io-channel-names
+  - monitored-battery
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/interrupt-controller/irq.h>
+
+    pmic {
+      #address-cells = <1>;
+      #size-cells = <0>;
+      #interrupt-cells = <4>;
+
+      charger@1000 {
+        compatible = "qcom,pmi8998-charger";
+        reg = <0x1000>;
+
+        interrupts = <0x2 0x12 0x2 IRQ_TYPE_EDGE_BOTH>,
+                     <0x2 0x13 0x4 IRQ_TYPE_EDGE_BOTH>,
+                     <0x2 0x13 0x6 IRQ_TYPE_EDGE_RISING>,
+                     <0x2 0x16 0x1 IRQ_TYPE_EDGE_RISING>;
+        interrupt-names = "usb-plugin", "bat-ov", "wdog-bark", "usbin-icl-change";
+
+        io-channels = <&pmi8998_rradc 3>,
+                      <&pmi8998_rradc 4>;
+        io-channel-names = "usbin_i",
+                           "usbin_v";
+
+        monitored-battery = <&battery>;
+      };
+    };