dt-bindings: mfd: ti,bq25703a: Add TI BQ25703A Charger

Document the Texas instruments BQ25703A series of charger managers/
buck/boost regulators.

Signed-off-by: Chris Morgan <macromorgan@hotmail.com>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20250904160530.66178-2-macroalpha82@gmail.com
Signed-off-by: Lee Jones <lee@kernel.org>

Documentation/devicetree/bindings/mfd/ti,bq25703a.yaml

@@ -0,0 +1,117 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/mfd/ti,bq25703a.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: BQ25703A Charger Manager/Buck/Boost Converter
+
+maintainers:
+  - Chris Morgan <macromorgan@hotmail.com>
+
+allOf:
+  - $ref: /schemas/power/supply/power-supply.yaml#
+
+properties:
+  compatible:
+    const: ti,bq25703a
+
+  reg:
+    const: 0x6b
+
+  input-current-limit-microamp:
+    description:
+      Maximum total input current allowed used for both charging and
+      powering the device.
+    minimum: 50000
+    maximum: 6400000
+    default: 3250000
+
+  interrupts:
+    maxItems: 1
+
+  monitored-battery:
+    description:
+      A minimum of constant-charge-current-max-microamp,
+      constant-charge-voltage-max-microvolt, and
+      voltage-min-design-microvolt are required.
+
+  regulators:
+    type: object
+    additionalProperties: false
+    description:
+      Boost converter regulator output of bq257xx.
+
+    properties:
+      vbus:
+        type: object
+        $ref: /schemas/regulator/regulator.yaml
+        additionalProperties: false
+
+        properties:
+          regulator-name: true
+          regulator-min-microamp:
+            minimum: 0
+            maximum: 6350000
+          regulator-max-microamp:
+            minimum: 0
+            maximum: 6350000
+          regulator-min-microvolt:
+            minimum: 4480000
+            maximum: 20800000
+          regulator-max-microvolt:
+            minimum: 4480000
+            maximum: 20800000
+          enable-gpios:
+            description:
+              The BQ25703 may require both a register write and a GPIO
+              toggle to enable the boost regulator.
+
+        required:
+          - regulator-name
+          - regulator-min-microamp
+          - regulator-max-microamp
+          - regulator-min-microvolt
+          - regulator-max-microvolt
+
+unevaluatedProperties: false
+
+required:
+  - compatible
+  - reg
+  - input-current-limit-microamp
+  - monitored-battery
+  - power-supplies
+
+examples:
+  - |
+    #include <dt-bindings/gpio/gpio.h>
+    #include <dt-bindings/interrupt-controller/irq.h>
+    #include <dt-bindings/pinctrl/rockchip.h>
+    i2c {
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        bq25703: charger@6b {
+            compatible = "ti,bq25703a";
+            reg = <0x6b>;
+            input-current-limit-microamp = <5000000>;
+            interrupt-parent = <&gpio0>;
+            interrupts = <RK_PD5 IRQ_TYPE_LEVEL_LOW>;
+            monitored-battery = <&battery>;
+            power-supplies = <&fusb302>;
+
+            regulators {
+                usb_otg_vbus: vbus {
+                    enable-gpios = <&gpio4 RK_PA6 GPIO_ACTIVE_HIGH>;
+                    regulator-max-microamp = <960000>;
+                    regulator-max-microvolt = <5088000>;
+                    regulator-min-microamp = <512000>;
+                    regulator-min-microvolt = <4992000>;
+                    regulator-name = "usb_otg_vbus";
+                };
+            };
+        };
+    };
+
+...