Merge branch 'devicetree/dtc' into devicetree/next
[linux-2.6-microblaze.git] / Documentation / devicetree / bindings / clock / nvidia,tegra114-car.txt
1 NVIDIA Tegra114 Clock And Reset Controller
2
3 This binding uses the common clock binding:
4 Documentation/devicetree/bindings/clock/clock-bindings.txt
5
6 The CAR (Clock And Reset) Controller on Tegra is the HW module responsible
7 for muxing and gating Tegra's clocks, and setting their rates.
8
9 Required properties :
10 - compatible : Should be "nvidia,tegra114-car"
11 - reg : Should contain CAR registers location and length
12 - clocks : Should contain phandle and clock specifiers for two clocks:
13   the 32 KHz "32k_in", and the board-specific oscillator "osc".
14 - #clock-cells : Should be 1.
15   In clock consumers, this cell represents the clock ID exposed by the
16   CAR. The assignments may be found in header file
17   <dt-bindings/clock/tegra114-car.h>.
18 - #reset-cells : Should be 1.
19   In clock consumers, this cell represents the bit number in the CAR's
20   array of CLK_RST_CONTROLLER_RST_DEVICES_* registers.
21
22 Example SoC include file:
23
24 / {
25         tegra_car: clock {
26                 compatible = "nvidia,tegra114-car";
27                 reg = <0x60006000 0x1000>;
28                 #clock-cells = <1>;
29                 #reset-cells = <1>;
30         };
31
32         usb@c5004000 {
33                 clocks = <&tegra_car TEGRA114_CLK_USB2>;
34         };
35 };
36
37 Example board file:
38
39 / {
40         clocks {
41                 compatible = "simple-bus";
42                 #address-cells = <1>;
43                 #size-cells = <0>;
44
45                 osc: clock@0 {
46                         compatible = "fixed-clock";
47                         reg = <0>;
48                         #clock-cells = <0>;
49                         clock-frequency = <12000000>;
50                 };
51
52                 clk_32k: clock@1 {
53                         compatible = "fixed-clock";
54                         reg = <1>;
55                         #clock-cells = <0>;
56                         clock-frequency = <32768>;
57                 };
58         };
59
60         &tegra_car {
61                 clocks = <&clk_32k> <&osc>;
62         };
63 };