linux-kernel - [PATCH v2 3/4] regulator: rt4831: Adds DT binding document for Richtek RT4831 DSV regulator

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Message-Id: <1607011595-13603-3-git-send-email-u0084500@gmail.com>
Date:   Fri,  4 Dec 2020 00:06:34 +0800
From:   cy_huang <u0084500@...il.com>
To:     lee.jones@...aro.org, robh+dt@...nel.org
Cc:     cy_huang@...htek.com, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org
Subject: [PATCH v2 3/4] regulator: rt4831: Adds DT binding document for Richtek RT4831 DSV regulator

From: ChiYuan Huang <cy_huang@...htek.com>

Adds DT binding document for Richtek RT4831 DSV regulator.

Signed-off-by: ChiYuan Huang <cy_huang@...htek.com>
---
 .../regulator/richtek,rt4831-regulator.yaml        | 67 ++++++++++++++++++++++
 1 file changed, 67 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..bc1e976
--- /dev/null
+++ b/Documentation/devicetree/bindings/regulator/richtek,rt4831-regulator.yaml
@@ -0,0 +1,67 @@
+# SPDX-License-Identifier: GPL-2.0
+%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@...htek.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:
+  - |
+    i2c {
+      #address-cells = <1>;
+      #size-cells = <0>;
+
+      rt4831@11 {
+        compatible = "richtek,rt4831";
+        reg = <0x11>;
+
+        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