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+
+* Allwinner P2WI (Push/Pull 2 Wire Interface) controller
+
+Required properties :
+
+ - reg             : Offset and length of the register set for the device.
+ - compatible      : Should one of the following:
+                     - "allwinner,sun6i-a31-p2wi"
+ - interrupts      : The interrupt line connected to the P2WI peripheral.
+ - clocks          : The gate clk connected to the P2WI peripheral.
+ - resets          : The reset line connected to the P2WI peripheral.
+
+Optional properties :
+
+ - clock-frequency : Desired P2WI bus clock frequency in Hz. If not set the
+default frequency is 100kHz
+
+A P2WI may contain one child node encoding a P2WI slave device.
+
+Slave device properties:
+  Required properties:
+   - reg           : the I2C slave address used during the initialization
+                     process to switch from I2C to P2WI mode
+
+Example:
+
+        p2wi@01f03400 {
+                compatible = "allwinner,sun6i-a31-p2wi";
+                reg = <0x01f03400 0x400>;
+                interrupts = <0 39 4>;
+                clocks = <&apb0_gates 3>;
+                clock-frequency = <6000000>;
+                resets = <&apb0_rst 3>;
+
+                axp221: pmic@68 {
+                        compatible = "x-powers,axp221";
+                        reg = <0x68>;
+
+                        /* ... */
+                };
+        };