* Qualcomm Technologies, Inc. MSM Camera CRE

The cre device node has properties defined to hint the driver
about the number of CRE nodes available during the
probe sequence. Each node has multiple properties defined
for interrupts, clocks and regulators.

=======================
Required Node Structure
=======================
CRE root interface node takes care of the handling account for number
of CRE devices present on the hardware.

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

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

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

Example:
	qcom,cam-cre {
		compatible = "qcom,cam-cre";
		compat-hw-name = "qcom,cre";
		num-cre = <2>;
		status = "ok";
	};

=======================
Required Node Structure
=======================
CRE Node provides interface for Image Control Processor driver
about the CRE 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,cre".

- 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: Register values.

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

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

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

- camss-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 CDM HW.

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

- clock-control-debugfs
  Usage: optional
  Value type: <string>
  Definition: Enable/Disable clk rate control.

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

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

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

Examples:
qcom,cam-cre {
	compatible = "qcom,cam-cre";
	compat-hw-name = "qcom,cre";
	num-cre = <1>;
	status = "ok";
};

cre: qcom,cre@ac00000 {
	cell-index = <0>;
	compatible = "qcom,cre";
	reg =
		<0xFA000 0x400>,
		<0xFA400 0xB0>,
		<0xFAB00 0x300>;
	reg-names =
		"cre_top",
		"cre_bus_rd",
		"cre_bus_wr";
	reg-cam-base = <0xFA000 0xFA400 0xFAB00>;
	interrupts = <GIC_SPI 463 IRQ_TYPE_EDGE_RISING>;
	interrupt-names = "cre";
	regulator-names = "camss-vdd";
	camss-vdd-supply = <&gcc_camss_top_gdsc>;
	clock-names =
		"cre_ahb_clk",
		"cre_clk_src",
		"cre_clk";
	clocks =
		<&gcc GCC_CAMSS_CRE_AHB_CLK>,
		<&gcc GCC_CAMSS_CRE_CLK_SRC>,
		<&gcc GCC_CAMSS_CRE_CLK>;

	clock-rates =
		<80000000 30000000 30000000>,
		<80000000 41000000 41000000>,
		<80000000 46000000 46000000>,
		<80000000 60000000 60000000>,
		<80000000 70000000 70000000>;

	clock-cntl-level = "lowsvs", "maxsvs", "svs", "nom", "turbo";
	src-clock-name = "cre_clk_src";
	status = "ok";
};