Peter De Schrijver | 76da314 | 2013-09-09 13:23:56 +0300 | [diff] [blame] | 1 | NVIDIA Tegra124 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,tegra124-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/tegra124-car.h>. |
Stephen Warren | 0799958 | 2013-11-07 10:11:27 -0700 | [diff] [blame] | 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. |
Peter De Schrijver | 76da314 | 2013-09-09 13:23:56 +0300 | [diff] [blame] | 21 | |
| 22 | Example SoC include file: |
| 23 | |
| 24 | / { |
| 25 | tegra_car: clock { |
| 26 | compatible = "nvidia,tegra124-car"; |
| 27 | reg = <0x60006000 0x1000>; |
| 28 | #clock-cells = <1>; |
Stephen Warren | 0799958 | 2013-11-07 10:11:27 -0700 | [diff] [blame] | 29 | #reset-cells = <1>; |
Peter De Schrijver | 76da314 | 2013-09-09 13:23:56 +0300 | [diff] [blame] | 30 | }; |
| 31 | |
| 32 | usb@c5004000 { |
| 33 | clocks = <&tegra_car TEGRA124_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 = <112400000>; |
| 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 | }; |