Qualcomm Technologies, Inc. QPNP Power-on PMIC Peripheral Device Tree Bindings

qpnp-power-on devices support the power-on (PON) peripheral found on
Qualcomm Technologies, Inc. PMICs. The supported functionality includes power
on/off reason, key press/release detection, PMIC reset configurations and other
PON specific features. The PON module supports multiple physical power-on
(KPDPWR_N, CBLPWR) and reset (KPDPWR_N, RESIN, KPDPWR+RESIN) sources. This
peripheral is connected to the host processor via the SPMI interface.

Required properties:
- compatible:			Must be "qcom,qpnp-power-on"
- reg:				Specifies the SPMI base address for this PON
				(power-on) peripheral.

Optional properties:
- interrupts:			Specifies the interrupts associated with PON.
- interrupt-names:		Specifies the interrupt names associated with
				the interrupts property. Must be a subset of
				"kpdpwr", "kpdpwr-bark", "resin", "resin-bark",
				"cblpwr", "kpdpwr-resin-bark", and
				"pmic-wd-bark". Bark interrupts are associated
				with system reset configuration to allow default
				reset configuration to be activated. If system
				reset configuration is not supported then bark
				interrupts are nops. Additionally, the
				"pmic-wd-bark" interrupt can be added if the
				system needs to handle PMIC watchdog barks.
- qcom,pon-dbc-delay:		The debounce delay for the power-key interrupt
				specified in us.
				Possible values for GEN1 PON are:
				15625, 31250, 62500, 125000, 250000, 500000,
				1000000 and 2000000.
				Possible values for GEN2 PON are:
				62, 123, 245, 489, 977, 1954, 3907, 7813,
				15625, 31250, 62500, 125000 and 250000.
				Intermediate value is rounded down to the
				nearest valid value.
- qcom,system-reset:		Boolean which specifies that this PON peripheral
				can be used to reset the system. This property
				can only be used by one device on the system. It
				is an error to include it more than once.
- qcom,modem-reset:		Boolean which specifies that this PON peripheral
				can be used to reset the attached modem chip.
				This property can only be used by one PON device
				on the system. qcom,modem-reset and
				qcom,system-reset cannot be specified for the
				same PON device.
- qcom,s3-debounce:		The debounce delay for stage 3 reset trigger in
				secs. The values range from 0 to 128.
- qcom,s3-src:			The source for stage 3 reset. It can be one of
				"kpdpwr", "resin", "kpdpwr-or-resin" or
				"kpdpwr-and-resin".
- qcom,uvlo-panic:		Boolean indicating that the device should
				trigger a controlled panic shutdown if a restart
				was caused by under voltage lock-out (UVLO).
- qcom,clear-warm-reset:	Boolean which specifies that the WARM_RESET
				reason registers need to be cleared for this
				target. The property is used for the targets
				which have a hardware feature to catch resets
				which aren't triggered by the application
				processor. In such cases clearing WARM_REASON
				registers across processor resets keeps the
				registers in a useful state.
- qcom,secondary-pon-reset:	Boolean property which indicates that the PON
				peripheral is a secondary PON device which
				needs to be configured during reset in addition
				to the primary PON device that is configured
				for system reset through qcom,system-reset
				property.
				This should not be defined along with the
				qcom,system-reset or qcom,modem-reset property.
- qcom,store-hard-reset-reason:	Boolean property which if set will store the
				hardware reset reason to SOFT_RB_SPARE register
				of the core PMIC PON peripheral.
- qcom,warm-reset-poweroff-type:	Poweroff type required to be configured
				on PS_HOLD reset control register when the
				system goes for warm reset. If this property is
				not specified, then the default type, warm reset
				will be configured to PS_HOLD reset control
				register.
				Supported values: PON_POWER_OFF_TYPE_* found in
				include/dt-bindings/input/qcom,qpnp-power-on.h
- qcom,hard-reset-poweroff-type:	Same description as
				qcom,warm-reset-poweroff-type but this applies
				for the system hard reset case.
- qcom,shutdown-poweroff-type:	Same description as qcom,warm-reset-poweroff-
				type but this applies for the system shutdown
				case.
- qcom,kpdpwr-sw-debounce:	Boolean property to enable the debounce logic
				on the KPDPWR_N rising edge.
- qcom,resin-pon-reset:		Boolean property which indicates that resin
				needs to be configured during reset in addition
				to the primary PON device that is configured
				for system reset through qcom,system-reset
				property.
- qcom,resin-warm-reset-type: 	Poweroff type required to be configured on
				RESIN reset control register when the system
				initiates warm reset. If this property is not
				specified, then the default type, warm reset
				will be configured to RESIN reset control
				register. This property is effective only if
				qcom,resin-pon-reset is defined.
				Supported values: PON_POWER_OFF_TYPE_* found in
				include/dt-bindings/input/qcom,qpnp-power-on.h
- qcom,resin-hard-reset-type: 	Same description as qcom,resin-warm-reset-type
				but this applies for the system hard reset case.
- qcom,resin-shutdown-type:   	Same description as qcom,resin-warm-reset-type
				but this applies for the system shutdown case.
- qcom,resin-shutdown-disable:	Boolean property to disable RESIN power off
				trigger during system shutdown case.
				This property is effective only if
				qcom,resin-pon-reset is defined.
- qcom,resin-hard-reset-disable:	Boolean property to disable RESIN power
	                        off trigger during system hard reset case.
				This property is effective only if
				qcom,resin-pon-reset is defined.
- qcom,ps-hold-shutdown-disable:	Boolean property to disable PS_HOLD
				power off trigger during system shutdown case.
- qcom,ps-hold-hard-reset-disable:	Boolean property to disable PS_HOLD
				power off trigger during system hard reset case.

Optional Sub-nodes:
- qcom,pon_1 ... qcom,pon_n:	These PON child nodes correspond to features
				supported by the PON peripheral including reset
				configurations, pushbutton keys, and regulators.

Sub-node properties:

Sub-nodes (if defined) should belong to either a PON configuration or a
regulator configuration.

Regulator sub-node required properties:
- regulator-name:		Regulator name for the PON regulator that is
				being configured.
- qcom,pon-spare-reg-addr:	Register offset from the base address of the
				PON peripheral that needs to be configured for
				the regulator being controlled.
- qcom,pon-spare-reg-bit:	Bit position in the specified register that
				needs to be configured for the regulator being
				controlled.

PON sub-node required properties:
- qcom,pon-type:		The type of PON/RESET source. Supported values:
				0 = KPDPWR
				1 = RESIN
				2 = CBLPWR
				3 = KPDPWR_RESIN
				These values are PON_POWER_ON_TYPE_* found in
				include/dt-bindings/input/qcom,qpnp-power-on.h

PON sub-node optional properties:
- qcom,pull-up:			Boolean flag indicating if a pull-up resistor
				should be enabled for the input.
- qcom,support-reset:		Indicates if this PON source supports
				reset functionality.
				0 = Not supported
				1 = Supported
				If this property is not defined, then default S2
				reset configurations should not be modified.
- qcom,use-bark:		Specify if this PON type needs to handle a bark
				interrupt.
- linux,code:			The input key-code associated with the reset
				source. The reset source in its default
				configuration can be used to support standard
				keys.

The below mentioned properties are required only when qcom,support-reset DT
property is defined and is set to 1.

- qcom,s1-timer:		The debounce timer for the BARK interrupt for
				the reset source. Value is specified in ms.
				Supported values are:
				0, 32, 56, 80, 128, 184, 272, 408, 608, 904,
				1352, 2048, 3072, 4480, 6720, 10256
- qcom,s2-timer:		The debounce timer for the S2 reset specified
				in ms. On the expiry of this timer, the PMIC
				executes the reset sequence.
				Supported values are:
				0, 10, 50, 100, 250, 500, 1000, 2000
- qcom,s2-type:			The type of reset associated with this source.
				Supported values:
				0 = SOFT_RESET (legacy)
				1 = WARM_RESET
				4 = SHUTDOWN
				5 = DVDD_SHUTDOWN
				7 = HARD_RESET
				8 = DVDD_HARD_RESET
				These values are PON_POWER_OFF_TYPE_* found in
				include/dt-bindings/input/qcom,qpnp-power-on.h

Examples:
	qcom,power-on@800 {
		compatible = "qcom,qpnp-power-on";
		reg = <0x800>;
		interrupts = <0x0 0x8 0x0 IRQ_TYPE_EDGE_BOTH>,
			     <0x0 0x8 0x1 IRQ_TYPE_EDGE_BOTH>,
			     <0x0 0x8 0x4 IRQ_TYPE_EDGE_RISING>,
			     <0x0 0x8 0x5 IRQ_TYPE_EDGE_RISING>;
		interrupt-names = "kpdpwr", "resin", "resin-bark",
				  "kpdpwr-resin-bark";
		qcom,pon-dbc-delay = <15625>;
		qcom,system-reset;
		qcom,s3-debounce = <32>;
		qcom,s3-src = "resin";
		qcom,clear-warm-reset;
		qcom,store-hard-reset-reason;

		qcom,pon_1 {
			qcom,pon-type = <PON_POWER_ON_TYPE_KPDPWR>;
			qcom,pull-up;
			linux,code = <KEY_POWER>;
		};

		qcom,pon_2 {
			qcom,pon-type = <PON_POWER_ON_TYPE_RESIN>;
			qcom,support-reset = <1>;
			qcom,pull-up;
			qcom,s1-timer = <0>;
			qcom,s2-timer = <2000>;
			qcom,s2-type = <PON_POWER_OFF_TYPE_WARM_RESET>;
			linux,code = <KEY_VOLUMEDOWN>;
			qcom,use-bark;
		};

		qcom,pon_3 {
			qcom,pon-type = <PON_POWER_ON_TYPE_KPDPWR_RESIN>;
			qcom,support-reset = <1>;
			qcom,s1-timer = <6720>;
			qcom,s2-timer = <2000>;
			qcom,s2-type = <PON_POWER_OFF_TYPE_HARD_RESET>;
			qcom,pull-up;
			qcom,use-bark;
		};
	};

	qcom,power-on@800 {
		compatible = "qcom,qpnp-power-on";
		reg = <0x800>;
		qcom,secondary-pon-reset;
		qcom,hard-reset-poweroff-type = <PON_POWER_OFF_TYPE_SHUTDOWN>;

		pon_perph_reg: qcom,pon_perph_reg {
			regulator-name = "pon_spare_reg";
			qcom,pon-spare-reg-addr = <0x8c>;
			qcom,pon-spare-reg-bit = <1>;
		};
	};
