* Qualcomm Technologies, Inc. MSM Camera FD

The MSM camera Face Detection device provides dependency definitions
for enabling Camera FD HW. MSM camera FD is implemented in multiple
device nodes. The root FD device node has properties defined to hint
the driver about the FD HW nodes available during the probe sequence.
Each node has multiple properties defined for interrupts, clocks and
regulators.

=======================
Required Node Structure
=======================
FD root interface node takes care of the handling Face Detection high level
driver handling and controls underlying FD hardware present.

- compatible
  Usage: required
  Value type: <string>
  Definition: Should be "qcom,cam-fd".

- compat-hw-name
  Usage: required
  Value type: <string>
  Definition: Should be "qcom,fd".

- num-fd
  Usage: required
  Value type: <u32>
  Definition: Number of supported FD HW blocks.

Example:
	qcom,cam-fd {
		compatible = "qcom,cam-fd";
		compat-hw-name = "qcom,fd";
		num-fd = <1>;
	};

=======================
Required Node Structure
=======================
FD Node provides interface for Face Detection hardware driver
about the device register map, interrupt map, clocks, regulators.

- cell-index
  Usage: required
  Value type: <u32>
  Definition: Node instance number.

- compatible
  Usage: required
  Value type: <string>
  Definition: Should be "qcom,fd41".

- reg-names
  Usage: optional
  Value type: <string>
  Definition: Name of the register resources.

- reg
  Usage: optional
  Value type: <u32>
  Definition: Register values.

- reg-cam-base
  Usage: optional
  Value type: <u32>
  Definition: Offset of the register space compared to
              to Camera base register space.

- interrupt-names
  Usage: optional
  Value type: <string>
  Definition: Name of the interrupt.

- interrupts
  Usage: optional
  Value type: <u32>
  Definition: Interrupt line associated with FD HW.

- regulator-names
  Usage: required
  Value type: <string>
  Definition: Name of the regulator resources for FD HW.

- camss-vdd-supply
  Usage: required
  Value type: <phandle>
  Definition: Regulator reference corresponding to the names listed
              in "regulator-names".

- clock-names
  Usage: required
  Value type: <string>
  Definition: List of clock names required for FD HW.

- clocks
  Usage: required
  Value type: <phandle>
  Definition: List of clocks required for FD HW.

- clock-rates
  Usage: required
  Value type: <u32>
  Definition: List of clocks rates.

- src-clock-name
  Usage: required
  Value type: <string>
  Definition: Source clock name.

- clock-cntl-level
  Usage: required
  Value type: <string>
  Definition: List of strings corresponds clock-rates levels.
  Supported strings: minsvs, lowsvs, svs, svs_l1, nominal, turbo.

Examples:
	cam_fd: qcom,fd@ac5a000 {
		cell-index = <0>;
		compatible = "qcom,fd41";
		reg-names = "fd_core", "fd_wrapper";
		reg = <0xac5a000 0x1000>,
			<0xac5b000 0x400>;
		reg-cam-base = <0x5a000 0x5b000>;
		interrupt-names = "fd";
		interrupts = <0 462 0>;
		regulator-names = "camss-vdd";
		camss-vdd-supply = <&titan_top_gdsc>;
		clock-names = "gcc_ahb_clk",
			"gcc_axi_clk",
			"soc_ahb_clk",
			"cpas_ahb_clk",
			"camnoc_axi_clk",
			"fd_core_clk_src",
			"fd_core_clk",
			"fd_core_uar_clk";
		clocks = <&clock_gcc GCC_CAMERA_AHB_CLK>,
			<&clock_gcc GCC_CAMERA_AXI_CLK>,
			<&clock_camcc CAM_CC_SOC_AHB_CLK>,
			<&clock_camcc CAM_CC_CPAS_AHB_CLK>,
			<&clock_camcc CAM_CC_CAMNOC_AXI_CLK>,
			<&clock_camcc CAM_CC_FD_CORE_CLK_SRC>,
			<&clock_camcc CAM_CC_FD_CORE_CLK>,
			<&clock_camcc CAM_CC_FD_CORE_UAR_CLK>;
		src-clock-name = "fd_core_clk_src";
		clock-cntl-level = "svs";
		clock-rates = <0 0 0 0 0 400000000 0 0>;
	};