dt-bindings: devfreq: Add DT bindings for devfreq_icc device

This patch adds the DT bindings for devfreq icc device driver.

Change-Id: Ic9473072204271d2fb8e642f149fdf02d874384f

bindings/devfreq/devfreq_icc.txt

@@ -0,0 +1,40 @@
+MSM devfreq icc device
+
+devfreq icc is a device that represents a MSM device's BW requirements from its
+master port(s) to a different device's slave port(s) in a MSM SoC. This
+device is typically used to vote for BW requirements from a device's (Eg:
+CPU, GPU) master port(s) to the slave (Eg: DDR) port(s).
+
+Required properties:
+- compatible:		Must be "qcom,devfreq-icc"
+- interconnects:	Pairs of phandles and interconnect provider specificers
+			to denote the edge source and destination ports of the
+			desired interconnect path.
+- qcom,bw-tbl:		A list of meaningful instantaneous bandwidth values
+			(in MB/s) that can be requested from the device
+			master port to the slave port. The list of values
+			depend on the supported bus/slave frequencies and the
+			bus width.
+
+Optional properties:
+- qcom,active-only:	Indicates that the bandwidth votes need to be
+			enforced only when the CPU subsystem is active.
+- governor:		Initial governor to use for the device.
+			Default: "performance"
+
+Example:
+
+	qcom,cpubw {
+		compatible = "qcom,devfreq-icc";
+		interconnects = <&mc_virt MASTER_LLCC &mc_virt SLAVE_EBI1>;
+		qcom,active-only;
+		qcom,bw-tbl =
+			<  572 /*  75 MHz */ >,
+			< 1144 /* 150 MHz */ >,
+			< 1525 /* 200 MHz */ >,
+			< 2342 /* 307 MHz */ >,
+			< 3509 /* 460 MHz */ >,
+			< 4684 /* 614 MHz */ >,
+			< 6103 /* 800 MHz */ >,
+			< 7102 /* 931 MHz */ >;
+	};