[PATCH v3 3/4] regulator: rt4831: Adds DT binding document for Richtek RT4831 DSV regulator

[cy_huang <u0084500@gmail.com>]

From: ChiYuan Huang <cy_huang@richtek.com>

Adds DT binding document for Richtek RT4831 DSV regulator.

Signed-off-by: ChiYuan Huang <cy_huang@richtek.com>
---
since v3
- Add dual license tag in regulator binding document.
- Left regulator dt-binding example only.
---
 .../regulator/richtek,rt4831-regulator.yaml        | 57 ++++++++++++++++++++++
 1 file changed, 57 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/regulator/richtek,rt4831-regulator.yaml

diff --git a/Documentation/devicetree/bindings/regulator/richtek,rt4831-regulator.yaml b/Documentation/devicetree/bindings/regulator/richtek,rt4831-regulator.yaml
new file mode 100644
index 00000000..c6741f2
--- /dev/null
+++ b/Documentation/devicetree/bindings/regulator/richtek,rt4831-regulator.yaml
@@ -0,0 +1,57 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/regulator/richtek,rt4831-regulator.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Richtek RT4831 Display Bias Voltage Regulator
+
+maintainers:
+  - ChiYuan Huang <cy_huang@richtek.com>
+
+description: |
+  RT4831 is a multifunctional device that can provide power to the LCD display
+  and LCD backlight.
+
+  For Display Bias Voltage DSVP and DSVN, the output range is about 4V to 6.5V.
+  It is sufficient to meet the current LCD power requirement.
+
+  DSVLCM is a boost regulator in IC internal as DSVP and DSVN input power.
+  Its voltage should be configured above 0.15V to 0.2V gap larger than the
+  voltage needed for DSVP and DSVN. Too much voltage gap could improve the
+  voltage drop from the heavy loading scenario. But it also make the power
+  efficiency worse. It's a trade-off.
+
+  Datasheet is available at
+  https://www.richtek.com/assets/product_file/RT4831A/DS4831A-05.pdf
+
+patternProperties:
+  "^DSV(LCM|P|N)$":
+    type: object
+    $ref: regulator.yaml#
+    description:
+      Properties for single Display Bias Voltage regulator.
+
+additionalProperties: false
+
+examples:
+  - |
+    regulators {
+      DSVLCM {
+        regulator-min-microvolt = <4000000>;
+        regulator-max-microvolt = <7150000>;
+        regulator-allow-bypass;
+      };
+      DSVP {
+        regulator-name = "rt4831-dsvp";
+        regulator-min-microvolt = <4000000>;
+        regulator-max-microvolt = <6500000>;
+        regulator-boot-on;
+      };
+      DSVN {
+        regulator-name = "rt4831-dsvn";
+        regulator-min-microvolt = <4000000>;
+        regulator-max-microvolt = <6500000>;
+        regulator-boot-on;
+      };
+    };
-- 
2.7.4