dt-bindings: Add devicetree bindings

Add snapshot of device tree bindings from keystone common kernel, branch
"android-mainline-keystone-qcom-release" at c4c12103f9c0 ("Snap for 9228065
from e32903b9a63bb558df8b803b076619c53c16baad to
android-mainline-keystone-qcom-release").

Change-Id: I7682079615cbd9f29340a5c1f2a1d84ec441a1f1
Signed-off-by: Melody Olvera <quic_molvera@quicinc.com>

bindings/w1/fsl-imx-owire.yaml

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+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/w1/fsl-imx-owire.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Freescale i.MX One wire bus master controller
+
+maintainers:
+  - Martin Fuzzey <mfuzzey@parkeon.com>
+
+properties:
+  compatible:
+    oneOf:
+      - const: fsl,imx21-owire
+      - items:
+          - enum:
+              - fsl,imx27-owire
+              - fsl,imx50-owire
+              - fsl,imx51-owire
+              - fsl,imx53-owire
+          - const: fsl,imx21-owire
+
+  reg:
+    maxItems: 1
+
+  clocks:
+    maxItems: 1
+
+required:
+  - compatible
+  - reg
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/clock/imx5-clock.h>
+
+    owire@63fa4000 {
+        compatible = "fsl,imx53-owire", "fsl,imx21-owire";
+        reg = <0x63fa4000 0x4000>;
+        clocks = <&clks IMX5_CLK_OWIRE_GATE>;
+    };

bindings/w1/omap-hdq.txt

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+* OMAP HDQ One wire bus master controller
+
+Required properties:
+- compatible : should be "ti,omap3-1w" or "ti,am4372-hdq"
+- reg : Address and length of the register set for the device
+- interrupts : interrupt line.
+- ti,hwmods : "hdq1w"
+
+Optional properties:
+- ti,mode: should be "hdq": HDQ mode  "1w": one-wire mode.
+	   If not specified HDQ mode is implied.
+
+Example:
+
+- From omap3.dtsi
+  hdqw1w: 1w@480b2000 {
+	compatible = "ti,omap3-1w";
+	reg = <0x480b2000 0x1000>;
+	interrupts = <58>;
+	ti,hwmods = "hdq1w";
+	ti,mode = "hdq";
+  };

bindings/w1/w1-gpio.yaml

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+# SPDX-License-Identifier: GPL-2.0
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/w1/w1-gpio.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Bitbanged GPIO 1-Wire Bus
+
+maintainers:
+  - Daniel Mack <zonque@gmail.com>
+
+properties:
+  compatible:
+    const: w1-gpio
+
+  gpios:
+    minItems: 1
+    items:
+      - description: Data I/O pin
+      - description: Enable pin for an external pull-up resistor
+
+  linux,open-drain:
+    type: boolean
+    description: >
+      If specified, the data pin is considered in open-drain mode.
+
+required:
+  - compatible
+  - gpios
+
+additionalProperties:
+  type: object
+
+examples:
+  - |
+    #include <dt-bindings/gpio/gpio.h>
+
+    onewire {
+        compatible = "w1-gpio";
+        gpios = <&gpio 0 GPIO_ACTIVE_HIGH>;
+    };
+
+...

bindings/w1/w1.txt

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+Generic devicetree bindings for onewire (w1) busses
+===================================================
+
+Onewire busses are described through nodes of their master bus controller.
+Slave devices are listed as sub-nodes of such master devices. For now, only
+one slave is allowed per bus master.
+
+
+Example:
+
+	charger: charger {
+		compatible = "gpio-charger";
+		charger-type = "mains";
+		gpios = <&gpio 1 GPIO_ACTIVE_LOW>;
+	};
+
+	onewire {
+		compatible = "w1-gpio";
+		gpios = <&gpio 100 0>, <&gpio 101 0>;
+
+		battery {
+			compatible = "maxim,ds2760";
+			power-supplies = <&charger>;
+		};
+	};