soc: qcom: dcc: DCC driver for v2 hardware

* Data Capture and Compare (DCC)

DCC (Data Capture and Compare) is a DMA engine, which is used to save

configuration data or system memory contents during catastrophic failure or

SW trigger.

It can also perform CRC over the same configuration or memory space.

Required properties:

- compatible : name of the component used for driver matching, should be

	       "qcom,dcc" or "qcom,dcc_v2"

- reg : physical base address and length of the register set(s), SRAM and XPU

	of the component.

- reg-names : names corresponding to each reg property value.

Optional properties:

- clocks: phandle reference to the parent clock.

- clock-names: Name of the clock that needs to be enabled for the HW to run.

	       Turned off when the subsystem is disabled.

- qcom,save-reg: boolean, To save dcc registers state in memory after dcc

		 enable and disable

- qcom,data-sink: string, To specify default data sink for dcc, should be one

		  of the following:

		  "atb"	  : To send captured data over ATB to a trace sink

		  "sram"  : To save captured data in dcc internal SRAM.

Example:

	dcc: dcc@4b3000 {

		compatible = "qcom,dcc";

		reg = <0x4b3000 0x1000>,

		      <0x4b4000 0x2000>,

		      <0x4b0000 0x1>;

		reg-names = "dcc-base", "dcc-ram-base", "dcc-xpu-base";

		clocks = <&clock_gcc clk_gcc_dcc_ahb_clk>;

		clock-names = "dcc_clk";

		qcom,save-reg;

	};

endif # MSM_IDLE_STATS

endif # MSM_PM

config QCOM_DCC_V2

	bool "Qualcomm Technologies Data Capture and Compare enigne support for V2"

	help

	  This option enables driver for Data Capture and Compare engine. DCC

	  driver provides interface to configure DCC block and read back

	  captured data from DCC's internal SRAM.

obj-$(CONFIG_MSM_EVENT_TIMER) += event_timer.o

obj-$(CONFIG_MSM_IDLE_STATS)	+= lpm-stats.o

obj-$(CONFIG_APSS_CORE_EA)	+= msm-core.o debug_core.o

obj-$(CONFIG_QCOM_DCC_V2) += dcc_v2.o