Add dt-binding for mtk-cpufreq driver so that the driver could get SoC specific
information (intermediate_clk for now) from device tree.

Signed-off-by: pi-cheng.chen <redacted>
---
 .../devicetree/bindings/cpufreq/cpufreq-mtk.txt         | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/cpufreq/cpufreq-mtk.txt

diff --git a/Documentation/devicetree/bindings/cpufreq/cpufreq-mtk.txt b/Documentation/devicetree/bindings/cpufreq/cpufreq-mtk.txt
new file mode 100644
index 0000000..53bf108
--- /dev/null
+++ b/Documentation/devicetree/bindings/cpufreq/cpufreq-mtk.txt

@@ -0,0 +1,17 @@
+
+Mediatek cpufreq driver
+-------------------
+
+Mediatek SoC cpufreq driver for CPU frequency scaling.
+
+Required properties:
+- compatible: "mediatek,mtk-cpufreq"
+- intermediate_clk: The intermediate clock source which CPUs will switch to
+during CPU frequency transition.
+
+Examples:
+--------
+       mtk-cpufreq {
+               compatible = "mediatek,mtk-cpufreq";
+               intermediate_clk = <&apmixedsys APMIXED_MAINPLL>;
+       };