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diff --git a/doc/device-tree-bindings/pmic/sandbox.txt b/doc/device-tree-bindings/pmic/sandbox.txt
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+Sandbox pmic
+
+This device uses two drivers:
+- drivers/power/pmic/sandbox.c (for parent device)
+- drivers/power/regulator/sandbox.c (for child regulators)
+
+This file describes the binding info for the PMIC driver.
+
+To bind the regulators, please read the regulator binding info:
+- doc/device-tree-bindings/regulator/sandbox.txt
+
+Required PMIC node properties:
+- compatible: "sandbox,pmic"
+- reg = 0x40
+
+Required PMIC's "emul" subnode,  with property:
+- compatible: "sandbox,i2c-pmic"
+
+With the above properties, the pmic device can be used for read/write only.
+To bind each regulator, the optional regulator subnodes should exists.
+
+Optional subnodes:
+- ldo/buck subnodes of each device's regulator (see regulator binding info)
+
+Example:
+
+sandbox_pmic {
+	compatible = "sandbox,pmic";
+	reg = <0x40>;
+
+	/* Mandatory for I/O */
+	emul {
+		compatible = "sandbox,i2c-pmic";
+	};
+};
diff --git a/doc/device-tree-bindings/regulator/sandbox.txt b/doc/device-tree-bindings/regulator/sandbox.txt
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+Sandbox, PMIC regulators
+
+This device uses two drivers:
+- drivers/power/pmic/sandbox.c (as parent I/O device)
+- drivers/power/regulator/sandbox.c (for child regulators)
+
+This file describes the binding info for the REGULATOR driver.
+
+First, please read the binding info for the PMIC:
+- doc/device-tree-bindings/pmic/sandbox.txt
+
+Required subnodes:
+- ldoN { };
+- buckN { };
+
+The sandbox PMIC can support: ldo1, ldo2, buck1, buck2.
+
+For each PMIC's regulator subnode, there is one required property:
+- regulator-name: used for regulator uclass platform data '.name'
+
+Optional:
+- regulator-min-microvolt: minimum allowed Voltage to set
+- regulator-max-microvolt: minimum allowed Voltage to set
+- regulator-min-microamps: minimum allowed Current limit to set (LDO1/BUCK1)
+- regulator-max-microamps: minimum allowed Current limit to set (LDO1/BUCK1)
+- regulator-always-on: regulator should be never disabled
+- regulator-boot-on: regulator should be enabled by the bootloader
+
+Example PMIC's regulator subnodes:
+
+ldo1 {
+	regulator-name = "VDD_1.0V";
+	regulator-min-microvolt = <1000000>;
+	regulator-max-microvolt = <1200000>;
+	regulator-min-microamps = <100000>;
+	regulator-max-microamps = <400000>;
+	regulator-always-on;
+};
+
+buck2 {
+	regulator-name = "VDD_1.8V";
+	regulator-min-microvolt = <1800000>;
+	regulator-max-microvolt = <1800000>;
+	regulator-boot-on;
+};