[PATCH 1/2] dt-bindings: regulator: Add bindings for Richtek RT5739

[cy_huang]

From: ChiYuan Huang <cy_huang@xxxxxxxxxxx>

Add the binding document for Richtek RT5739.

Signed-off-by: ChiYuan Huang <cy_huang@xxxxxxxxxxx>
---
 .../bindings/regulator/richtek,rt5739.yaml         | 80 ++++++++++++++++++++++
 1 file changed, 80 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/regulator/richtek,rt5739.yaml

diff --git a/Documentation/devicetree/bindings/regulator/richtek,rt5739.yaml b/Documentation/devicetree/bindings/regulator/richtek,rt5739.yaml
new file mode 100644
index 00000000..7dc4f78
--- /dev/null
+++ b/Documentation/devicetree/bindings/regulator/richtek,rt5739.yaml
@@ -0,0 +1,80 @@
+# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/regulator/richtek,rt5739.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Richtek RT5739 2.4MHz 3.5A Step-Down Converter
+
+maintainers:
+  - ChiYuan Huang <cy_huang@xxxxxxxxxxx>
+
+description: |
+  The RT5739 is a step-down switching voltage regulator that delivers a
+  digitally programmable output from an input voltage supply of 2.5V to 5.5V.
+  The output voltage is programmed through an I2C interface capable of
+  operating up to 3.4MHz.
+
+  Using a proprietary architecture with synchronous rectification, the RT5739
+  is capable of delivering 3.5A continuously at over 80% efficiency,
+  maintaining that efficiency at load current as low as 10mA. The regulator
+  operates at a normal fixed frequency of 2.4MHz, which reduces the value of
+  the external components. Additional output capacitance can be added to
+  improve regulation during load transients without affecting stability.
+
+allOf:
+  - $ref: regulator.yaml#
+
+properties:
+  compatible:
+    enum:
+      - richtek,rt5739
+
+  reg:
+    maxItems: 1
+
+  enable-gpios:
+    maxItems: 1
+
+  richtek,vsel-active-high:
+    description: |
+      If property is present, use the 'VSEL1' register group for buck control.
+      Else, use the 'VSEL0' register group. This depends on external hardware
+      'VSEL' pin connecton.
+    type: boolean
+
+  regulator-allowed-modes:
+    description: |
+      buck allowed operating mode
+        0: Auto PFM/PWM mode
+        1: Forced PWM mode
+    maxItems: 2
+    items:
+      enum: [0, 1]
+
+required:
+  - compatible
+  - reg
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/gpio/gpio.h>
+
+    i2c {
+      #address-cells = <1>;
+      #size-cells = <0>;
+
+      regulator@50 {
+        compatible = "richtek,rt5739";
+        reg = <0x50>;
+        enable-gpios = <&gpio26 1 GPIO_ACTIVE_HIGH>;
+        richtek,vsel-active-high;
+        regulator-name = "richtek,rt5739-buck";
+        regulator-min-microvolt = <3000000>;
+        regulator-max-microvolt = <13000000>;
+        regulator-allowed-modes = <0 1>;
+        regulator-boot-on;
+      };
+    };
-- 
2.7.4