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+QPNP LCDB (LCD Bias) Regulator
+
+QPNP LCDB module provides voltage bias to the LCD display panel. The biases
+are positive (VDISP - supported by LDO) and negative (VDISN - supported by
+NCP) voltage signals. The module also supports TTW (touch-to-wake) capability.
+
+This document describes the bindings for QPNP LCDB module.
+
+=======================
+Required Node Structure
+=======================
+
+LCDB module must be described in two level of device nodes.
+
+==============================
+First Level Node - LCDB module
+==============================
+
+- compatible
+	Usage:      required
+	Value type: <string>
+	Definition: must be one of:
+			"qcom,qpnp-lcdb-regulator"
+			"qcom,lcdb-pm660"
+			"qcom,lcdb-pmi632"
+			"qcom,lcdb-pm6150l"
+
+- reg
+	Usage:      required
+	Value type: <prop-encoded-array>
+	Definition:  Base address of the LCDB SPMI peripheral.
+
+- qcom,pmic-revid
+	Usage:      required
+	Value type: <phandle>
+	Definition:  Phandle to the PMIC's revid node
+
+- qcom,voltage-step-ramp
+	Usage:      optional
+	Value type: <bool>
+	Definition:  Required only if the voltage needs to be set in the
+		     steps of 500 mV starting from the 4500 mV. This needs
+		     to be enabled only on platforms where voltage needs to
+		     be ramped up with multiple steps.
+
+- qcom,pwrdn-delay-ms
+	Usage:      optional
+	Value type: <u32>
+	Definition:  Required to control the LDO power down delay.
+		     Possible values are 0, 1, 4, 8.
+
+Touch-to-wake (TTW) properties:
+
+TTW supports 2 modes of operation - HW and SW. In the HW mode the enable/disable
+logic is controlled by an external signal (pin) where as in the SW mode it is
+is controlled by a pre-configured timer (ton/toff) programmed in the TTW
+register.
+
+Properties below are specific to TTW mode only. They are sepecified in the
+main node.
+
+- qcom,ttw-enable
+	Usage:      optional
+	Value type:  <bool>
+	Definition: Touch to wake-up support enabled.
+
+- qcom,ttw-mode-sw
+	Usage:      optional
+	Value type:  <bool>
+	Definition: Touch to wake supported in SW mode.
+		    If not defined, ttw is enabled by HW pin.
+
+- qcom,attw-toff-ms
+	Usage:      required if 'qcom,ttw-mode-sw' is true.
+	Value type:  <bool>
+	Definition: Off time (in mS) for the VDISP/VDISN signals.
+		    Possible values are 4, 8, 16, 32.
+
+- qcom,attw-ton-ms
+	Usage:      required if 'qcom,ttw-mode-sw' is true.
+	Value type:  <bool>
+	Definition: ON time (in mS) for the VDISP/VDISN signals.
+		    Possible values are 4, 8, 16, 32.
+
+========================================
+Second Level Nodes - LDO/NCP/BOOST block
+========================================
+
+LDO / NCP subnode common properties:
+
+Properties below are common to the LDO and NCP bias.
+
+- label
+	Usage:      required
+	Value type: <string>
+	Definition: A string used to describe the bias type.
+		    Possible values are ldo, ncp, bst.
+
+- regulator-name
+	Usage:      required
+	Value type: <string>
+	Definition: A string used to describe the regulator.
+
+- regulator-min-microvolt
+	Usage:      required
+	Value type: <u32>
+	Definition: Minimum voltage (in uV) supported by the bias.
+
+- regulator-max-microvolt
+	Usage:      required
+	Value type: <u32>
+	Definition: Maximum voltage (in uV) supported by the bias.
+
+
+LDO subnode properties:
+
+Properties below are specific to LDO bias only.
+
+- qcom,ldo-voltage-mv
+	Usage:      optional
+	Value type:  <u32>
+	Definition: Voltage (in mV) progammed for the LDO (VDISP).
+		    Possile values are 4000mV to 6000mV. The range
+		    4000mV to 4900mV is in 100mV steps and 4900mV to
+		    6000mV is in 50mV steps.
+
+- qcom,ldo-pd
+	Usage:      optional
+	Value type:  <u32>
+	Definition: Pull-down configuration of LDO. Possible values are:
+		    1 - Enable pull-down
+		    0 - Disable pull-down
+
+- qcom,ldo-pd-strength
+	Usage:      optional
+	Value type:  <u32>
+	Definition: Pull-down strength. Possible values are:
+		    0 - Weak pull-down
+		    1 - Strong pull-down
+
+- qcom,ldo-ilim-ma
+	Usage:      optional
+	Value type:  <u32>
+	Definition:  Current limit (in mA) of the LDO bias.
+		     Possible values are 110, 160, 210, 260, 310, 360, 410, 460.
+
+- qcom,ldo-soft-start-us
+	Usage:      optional
+	Value type:  <u32>
+	Definition:  Soft-start time (in uS) of the LDO bias.
+		     Possible values are 0, 500, 1000, 2000.
+
+
+NCP subnode properties:
+
+Properties below are specific to NCP bias only.
+
+- qcom,ncp-voltage-mv
+	Usage:      optional
+	Value type:  <u32>
+	Definition: Voltage (in mV) progammed for the NCP (VDISN).
+		    Possile values are 4000mV to 6000mV. The range
+		    4000mV to 4900mV is in 100mV steps and 4900mV to
+		    6000mV is in 50mV steps.
+
+- qcom,ncp-pd
+	Usage:      optional
+	Value type:  <u32>
+	Definition: Pull-down configuration of NCP. Possible values are:
+		    1 - Enable pull-down
+		    0 - Disable pull-down
+
+- qcom,ncp-pd-strength
+	Usage:      optional
+	Value type:  <u32>
+	Definition: Pull-down strength. Possible values are:
+		    0 - Weak pull-down
+		    1 - Strong pull-down
+
+- qcom,ncp-ilim-ma
+	Usage:      optional
+	Value type:  <u32>
+	Definition:  Current limit (in mA) of the NCP bias.
+		     Possible values are 260, 460, 640, 810.
+
+- qcom,ncp-soft-start-us
+	Usage:      optional
+	Value type:  <u32>
+	Definition:  Soft-start time (in uS) of the NCP bias.
+		     Possible values are 0, 500, 1000, 2000.
+
+
+BOOST subnode properties:
+
+Properties below are specific to BOOST subnode only.
+
+- qcom,bst-pd
+	Usage:      optional
+	Value type:  <bool>
+	Definition: Pull-down configuration of BOOST. Possible values are:
+		    1 - Enable pull-down
+		    0 - Disable pull-down
+
+- qcom,bst-pd-strength
+	Usage:      optional
+	Value type:  <u32>
+	Definition: Pull-down strength. Possible values are:
+		    0 - Weak pull-down
+		    1 - Strong pull-down
+
+- qcom,bst-ps
+	Usage:      optional
+	Value type:  <u32>
+	Definition: Pulse-skip configuration for boost. Possible values are:
+		    1 - Enable Pulse-skip
+		    0 - Disable Pulse-skip
+
+- qcom,bst-ps-threshold-ma
+	Usage:      optional
+	Value type:  <u32>
+	Definition: Current threshold (in mA) at which pulse-skip is entered.
+		    Possible values are 50, 60, 70, 80.
+
+- qcom,bst-ilim-ma
+	Usage:      optional
+	Value type:  <u32>
+	Definition:  Current limit (in mA) of the BOOST rail.
+		     Possible values are 200 to 1600mA in 200mA steps.
+
+- qcom,bst-headroom-mv
+	Usage:      optional
+	Value type:  <u16>
+	Definition:  Headroom of the boost (in mV). If not specified, then the
+		     default value is 200 mV (PM660L) or 150 mV (for PM8150L or
+		     PMI632).
+
+=======
+Example
+=======
+
+pm660l_lcdb: qpnp-lcdb@ec00 {
+	compatible = "qcom,qpnp-lcdb-regulator";
+	#address-cells = <1>;
+	#size-cells = <1>;
+	reg = <0xec00 0x100>;
+
+	qcom,ttw-enable;
+
+	lcdb_ldo_vreg: ldo {
+		label = "ldo";
+		regulator-name = "lcdb_ldo";
+		regulator-min-microvolt = <4000000>;
+		regulator-max-microvolt = <6000000>;
+
+		qcom,ldo-voltage-mv = <5400>;
+		qcom,ldo-pd = <1>;
+		qcom,ldo-pd-strength = <1>;
+	};
+
+	lcdb_ncp_vreg: ncp {
+		label = "ncp";
+		regulator-name = "lcdb_ncp";
+		regulator-min-microvolt = <4000000>;
+		regulator-max-microvolt = <6000000>;
+
+		qcom,ncp-voltage-mv = <5400>;
+		qcom,ncp-pd = <1>;
+		qcom,ncp-pd-strength = <1>;
+	};
+
+	lcdb_bst: bst {
+		label = "bst";
+
+		qcom,bst-pd = <1>;
+		qcom,bst-pd-strength = <1>;
+		qcom,bst-ps = <1>;
+		qcom,bst-ps-threshold-ma = <50>;
+		qcom,bst-headroom-mv = <200>;
+	};
+};