msm: pp2s: FSM9900 PP2S driver

QTI Femtocell Pulse Per 2 Second (PP2S)

PP2S is a hardware generated pulse that occurs every two seconds and

is used for synchronizing certain system behaviors as they relate to

time.

The PP2S notification driver will be used by applications for two

reasons:

  1) So that they can be informed when PP2S interrupts occur, and

  2) So that the wall clock time registers can be accessed/manipulated

     from within the driver and from user space.

Two device tree nodes have been added.

The first is for the PP2S interrupt. It is made up of the following

required properties:

- compatible: "qcom,pp2s"

- interrupts: The interrupt number

- interrupt-names: the interrupt name

Example:

    qcom,pp2s {

        compatible = "qcom,pp2s";

        interrupts = <0 219 0>;

        interrupt-names = "pp2s_irq";

    };

The second is for mapping the wall clock regisers into usable

memory. It is made up of the required following:

- compatible: "qcom,wallclock"

- reg-names: The names given to the two memory bank locations

- reg: The base address and length for each bank

Example:

    qcom,wallclock@fd4aa000 {

        compatible = "qcom,wallclock";

        reg-names = "wallclock_time_bank", "wallclock_cntrl_bank";

        reg = <0xfd4aa000 0x20>, <0xfd4a9000 0x40>;

    };

	 line from the PMIC. This supply line is powered by multiple

	 regulators running in ganged mode inside the PMIC. Enable

	 this option to support such configurations.

config MSM_PP2S_FEMTO

	bool "FSM99XX PP2S Interrupt Notification"

	depends on ARCH_FSM9900

	help

	  Support for being notified relative to a PP2S pulse

	  Select Y if you want this notification to manifest.

	  If unsure, select N.

endif

obj-$(CONFIG_ARCH_MSM8974) += clock-rpm-8974.o clock-gcc-8974.o clock-mmss-8974.o clock-lpass-8974.o clock-mdss-8974.o

obj-$(CONFIG_KRAIT_REGULATOR) += krait-regulator.o  krait-regulator-pmic.o

obj-$(CONFIG_ARCH_MDM9630) += board-9630.o board-9630-gpiomux.o

obj-$(CONFIG_MSM_PP2S_FEMTO) += pp2s.o

obj-$(CONFIG_ARCH_MSMSAMARIUM) += board-samarium.o board-samarium-gpiomux.o

obj-$(CONFIG_ARCH_MSMSAMARIUM) += clock-samarium.o clock-mdss-8974.o

obj-$(CONFIG_ARCH_MPQ8092) += board-8092.o board-8092-gpiomux.o