dt-bindings: add binding document for Rockchip pvtm

This patch documents the Rockchip pvtm device tree binding.

Change-Id: I7edcd1d57ff2852eb6e6897680566abb7f9e76a9
Signed-off-by: Finley Xiao <finley.xiao@rock-chips.com>

diff --git a/Documentation/devicetree/bindings/soc/rockchip/rockchip-pvtm.txt b/Documentation/devicetree/bindings/soc/rockchip/rockchip-pvtm.txt
new file mode 100644 (file)
index 0000000..fa6fdd5
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+++ b/Documentation/devicetree/bindings/soc/rockchip/rockchip-pvtm.txt
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+Rockchip pvtm device tree bindings
+----------------------------------
+
+The Process-Voltage-Temperature Monitor (PVTM) is used to monitor the chip
+performance variance caused by chip process, voltage and temperature.
+
+
+Required properties:
+- compatible: Should be one of the following.
+ - "rockchip,rk3366-pvtm" - for RK3366 SoCs.
+ - "rockchip,rk3366-pmu-pvtm" - for RK3366 SoCs.
+ - "rockchip,rk3399-pvtm" - for RK3399 SoCs.
+ - "rockchip,rk3399-pmu-pvtm" - for RK3399 SoCs.
+- clocks: list of the clock controller input clock identifiers.
+- clock-names: list of the clock controller input clock names.
+
+Example:
+
+grf: syscon@ff770000 {
+       compatible = "rockchip,rk3399-grf", "syscon", "simple-mfd";
+       reg = <0x0 0xff770000 0x0 0x10000>;
+       #address-cells = <1>;
+       #size-cells = <1>;
+
+...
+
+       pvtm: pvtm {
+               compatible = "rockchip,rk3399-pvtm";
+               clocks = <&cru SCLK_PVTM_CORE_L>, <&cru SCLK_PVTM_CORE_B>,
+                       <&cru SCLK_PVTM_GPU>, <&cru SCLK_PVTM_DDR>;
+               clock-names = "core_l", "core_b", "gpu", "ddr";
+       };
+}