xref: /linux/Documentation/devicetree/bindings/clock/nvidia,tegra20-car.yaml (revision 4f2c0a4acffbec01079c28f839422e64ddeff004) 
1# SPDX-License-Identifier: (GPL-2.0+ OR BSD-2-Clause)
2%YAML 1.2
3---
4$id: http://devicetree.org/schemas/clock/nvidia,tegra20-car.yaml#
5$schema: http://devicetree.org/meta-schemas/core.yaml#
6
7title: NVIDIA Tegra Clock and Reset Controller
8
9maintainers:
10  - Jon Hunter <jonathanh@nvidia.com>
11  - Thierry Reding <thierry.reding@gmail.com>
12
13description: |
14  The Clock and Reset (CAR) is the HW module responsible for muxing and gating
15  Tegra's clocks, and setting their rates. It comprises CLKGEN and RSTGEN units.
16
17  CLKGEN provides the registers to program the PLLs. It controls most of
18  the clock source programming and most of the clock dividers.
19
20  CLKGEN input signals include the external clock for the reference frequency
21  (12 MHz, 26 MHz) and the external clock for the Real Time Clock (32.768 KHz).
22
23  Outputs from CLKGEN are inputs clock of the h/w blocks in the Tegra system.
24
25  RSTGEN provides the registers needed to control resetting of each block in
26  the Tegra system.
27
28properties:
29  compatible:
30    enum:
31      - nvidia,tegra20-car
32      - nvidia,tegra30-car
33      - nvidia,tegra114-car
34      - nvidia,tegra210-car
35
36  reg:
37    maxItems: 1
38
39  '#clock-cells':
40    const: 1
41
42  "#reset-cells":
43    const: 1
44
45patternProperties:
46  "^(sclk)|(pll-[cem])$":
47    type: object
48    properties:
49      compatible:
50        enum:
51          - nvidia,tegra20-sclk
52          - nvidia,tegra30-sclk
53          - nvidia,tegra30-pllc
54          - nvidia,tegra30-plle
55          - nvidia,tegra30-pllm
56
57      operating-points-v2: true
58
59      clocks:
60        items:
61          - description: node's clock
62
63      power-domains:
64        maxItems: 1
65        description: phandle to the core SoC power domain
66
67    required:
68      - compatible
69      - operating-points-v2
70      - clocks
71      - power-domains
72
73    additionalProperties: false
74
75required:
76  - compatible
77  - reg
78  - '#clock-cells'
79  - "#reset-cells"
80
81additionalProperties: false
82
83examples:
84  - |
85    #include <dt-bindings/clock/tegra20-car.h>
86
87    car: clock-controller@60006000 {
88        compatible = "nvidia,tegra20-car";
89        reg = <0x60006000 0x1000>;
90        #clock-cells = <1>;
91        #reset-cells = <1>;
92
93        sclk {
94            compatible = "nvidia,tegra20-sclk";
95            operating-points-v2 = <&opp_table>;
96            clocks = <&tegra_car TEGRA20_CLK_SCLK>;
97            power-domains = <&domain>;
98        };
99    };
100