[PATCH v8 1/2] dt-bindings: cpufreq: Introduce QCOM CPUFREQ Firmware bindings

[Taniya Das]

Add QCOM cpufreq firmware device bindings for Qualcomm Technology Inc's
SoCs. This is required for managing the cpu frequency transitions which are
controlled by the hardware engine.

Signed-off-by: Taniya Das <tdas@xxxxxxxxxxxxxx>
---
 .../bindings/cpufreq/cpufreq-qcom-hw.txt           | 169 +++++++++++++++++++++
 1 file changed, 169 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/cpufreq/cpufreq-qcom-hw.txt

diff --git a/Documentation/devicetree/bindings/cpufreq/cpufreq-qcom-hw.txt b/Documentation/devicetree/bindings/cpufreq/cpufreq-qcom-hw.txt
new file mode 100644
index 0000000..c06941c
--- /dev/null
+++ b/Documentation/devicetree/bindings/cpufreq/cpufreq-qcom-hw.txt
@@ -0,0 +1,169 @@
+Qualcomm Technologies, Inc. CPUFREQ Bindings
+
+CPUFREQ HW is a hardware engine used by some Qualcomm Technologies, Inc. (QTI)
+SoCs to manage frequency in hardware. It is capable of controlling frequency
+for multiple clusters.
+
+Properties:
+- compatible
+	Usage:		required
+	Value type:	<string>
+	Definition:	must be "qcom,cpufreq-hw".
+
+- clocks
+	Usage:		required
+	Value type:	<phandle> From common clock binding.
+	Definition:	clock handle for XO clock and GPLL0 clock.
+
+- clock-names
+	Usage:		required
+	Value type:	<string> From common clock binding.
+	Definition:	must be "xo", "cpu_clk".
+
+- reg
+	Usage:		required
+	Value type:	<prop-encoded-array>
+	Definition:	Addresses and sizes for the memory of the HW bases in
+			each frequency domain.
+- reg-names
+	Usage:		Optional
+	Value type:	<string>
+	Definition:	Frequency domain name i.e.
+			"freq-domain0", "freq-domain1".
+
+* Property qcom,freq-domain
+Devices supporting freq-domain must set their "qcom,freq-domain" property with
+phandle to a cpufreq_hw followed by the Domain ID(0/1) in the CPU DT node.
+
+
+Example:
+
+Example 1: Dual-cluster, Quad-core per cluster. CPUs within a cluster switch
+DCVS state together.
+
+/ {
+	cpus {
+		#address-cells = <2>;
+		#size-cells = <0>;
+
+		CPU0: cpu@0 {
+			device_type = "cpu";
+			compatible = "qcom,kryo385";
+			reg = <0x0 0x0>;
+			enable-method = "psci";
+			next-level-cache = <&L2_0>;
+			qcom,freq-domain = <&cpufreq_hw 0>;
+			L2_0: l2-cache {
+				compatible = "cache";
+				next-level-cache = <&L3_0>;
+				L3_0: l3-cache {
+				      compatible = "cache";
+				};
+			};
+		};
+
+		CPU1: cpu@100 {
+			device_type = "cpu";
+			compatible = "qcom,kryo385";
+			reg = <0x0 0x100>;
+			enable-method = "psci";
+			next-level-cache = <&L2_100>;
+			qcom,freq-domain = <&cpufreq_hw 0>;
+			L2_100: l2-cache {
+				compatible = "cache";
+				next-level-cache = <&L3_0>;
+			};
+		};
+
+		CPU2: cpu@200 {
+			device_type = "cpu";
+			compatible = "qcom,kryo385";
+			reg = <0x0 0x200>;
+			enable-method = "psci";
+			next-level-cache = <&L2_200>;
+			qcom,freq-domain = <&cpufreq_hw 0>;
+			L2_200: l2-cache {
+				compatible = "cache";
+				next-level-cache = <&L3_0>;
+			};
+		};
+
+		CPU3: cpu@300 {
+			device_type = "cpu";
+			compatible = "qcom,kryo385";
+			reg = <0x0 0x300>;
+			enable-method = "psci";
+			next-level-cache = <&L2_300>;
+			qcom,freq-domain = <&cpufreq_hw 0>;
+			L2_300: l2-cache {
+				compatible = "cache";
+				next-level-cache = <&L3_0>;
+			};
+		};
+
+		CPU4: cpu@400 {
+			device_type = "cpu";
+			compatible = "qcom,kryo385";
+			reg = <0x0 0x400>;
+			enable-method = "psci";
+			next-level-cache = <&L2_400>;
+			qcom,freq-domain = <&cpufreq_hw 1>;
+			L2_400: l2-cache {
+				compatible = "cache";
+				next-level-cache = <&L3_0>;
+			};
+		};
+
+		CPU5: cpu@500 {
+			device_type = "cpu";
+			compatible = "qcom,kryo385";
+			reg = <0x0 0x500>;
+			enable-method = "psci";
+			next-level-cache = <&L2_500>;
+			qcom,freq-domain = <&cpufreq_hw 1>;
+			L2_500: l2-cache {
+				compatible = "cache";
+				next-level-cache = <&L3_0>;
+			};
+		};
+
+		CPU6: cpu@600 {
+			device_type = "cpu";
+			compatible = "qcom,kryo385";
+			reg = <0x0 0x600>;
+			enable-method = "psci";
+			next-level-cache = <&L2_600>;
+			qcom,freq-domain = <&cpufreq_hw 1>;
+			L2_600: l2-cache {
+				compatible = "cache";
+				next-level-cache = <&L3_0>;
+			};
+		};
+
+		CPU7: cpu@700 {
+			device_type = "cpu";
+			compatible = "qcom,kryo385";
+			reg = <0x0 0x700>;
+			enable-method = "psci";
+			next-level-cache = <&L2_700>;
+			qcom,freq-domain = <&cpufreq_hw 1>;
+			L2_700: l2-cache {
+				compatible = "cache";
+				next-level-cache = <&L3_0>;
+			};
+		};
+	};
+
+ soc {
+	cpufreq_hw: qcom,cpufreq-hw {
+		compatible = "qcom,cpufreq-hw";
+		reg = <0x17d43000 0x1400>, <0x17d45800 0x1400>;
+		reg-names = "freq-domain0", "freq-domain1";
+
+		clocks = <&rpmhcc RPMH_CXO_CLK>, <&gcc GPLL0>;
+		clock-names = "xo", "cpu_clk";
+
+		#freq-domains-cells = <1>
+
+	};
+}
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