regulator: Add bindings for TPS62864x

Add bindings for the TPS62864/TPS6286/TPS62868/TPS62869 voltage
regulators.
Signed-off-by: NVincent Whitchurch <vincent.whitchurch@axis.com>
Link: https://lore.kernel.org/r/20220204155241.576342-2-vincent.whitchurch@axis.comSigned-off-by: NMark Brown <broonie@kernel.org>

Documentation/devicetree/bindings/regulator/ti,tps62864.yaml

+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/regulator/ti,tps62864.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: TI TPS62864/TPS6286/TPS62868/TPS62869 voltage regulator
+
+maintainers:
+  - Vincent Whitchurch <vincent.whitchurch@axis.com>
+
+properties:
+  compatible:
+    enum:
+      - ti,tps62864
+      - ti,tps62866
+      - ti,tps62868
+      - ti,tps62869
+
+  reg:
+    maxItems: 1
+
+  regulators:
+    type: object
+
+    patternProperties:
+      "SW":
+        type: object
+        $ref: regulator.yaml#
+
+    additionalProperties: false
+
+required:
+  - compatible
+  - reg
+  - regulators
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/regulator/ti,tps62864.h>
+    i2c {
+      #address-cells = <1>;
+      #size-cells = <0>;
+
+      regulator@48 {
+        compatible = "ti,tps62864";
+        reg = <0x48>;
+
+        regulators {
+          SW {
+            regulator-name = "+0.85V";
+            regulator-min-microvolt = <800000>;
+            regulator-max-microvolt = <890000>;
+            regulator-initial-mode = <TPS62864_MODE_FPWM>;
+          };
+        };
+      };
+    };
+
+...

include/dt-bindings/regulator/ti,tps62864.h

+/* SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) */
+
+#ifndef _DT_BINDINGS_REGULATOR_TI_TPS62864_H
+#define _DT_BINDINGS_REGULATOR_TI_TPS62864_H
+
+#define TPS62864_MODE_NORMAL			0
+#define TPS62864_MODE_FPWM			1
+
+#endif