dt-bindings: input: add qpnp-power-on bindings

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>;

		};

	};