xref: /linux/Documentation/devicetree/bindings/clock/rockchip,rk3308-cru.yaml (revision c532de5a67a70f8533d495f8f2aaa9a0491c3ad0) 
1# SPDX-License-Identifier: (GPL-2.0+ OR MIT)
2%YAML 1.2
3---
4$id: http://devicetree.org/schemas/clock/rockchip,rk3308-cru.yaml#
5$schema: http://devicetree.org/meta-schemas/core.yaml#
6
7title: Rockchip RK3308 Clock and Reset Unit (CRU)
8
9maintainers:
10  - Elaine Zhang <zhangqing@rock-chips.com>
11  - Heiko Stuebner <heiko@sntech.de>
12
13description: |
14  The RK3308 clock controller generates and supplies clocks to various
15  controllers within the SoC and also implements a reset controller for SoC
16  peripherals.
17  Each clock is assigned an identifier and client nodes can use this identifier
18  to specify the clock which they consume. All available clocks are defined as
19  preprocessor macros in the dt-bindings/clock/rk3308-cru.h headers and can be
20  used in device tree sources. Similar macros exist for the reset sources in
21  these files.
22  There are several clocks that are generated outside the SoC. It is expected
23  that they are defined using standard clock bindings with following
24  clock-output-names:
25    - "xin24m"                               - crystal input      - required
26    - "xin32k"                               - rtc clock          - optional
27    - "mclk_i2s0_8ch_in", "mclk_i2s1_8ch_in",
28      "mclk_i2s2_8ch_in", "mclk_i2s3_8ch_in",
29      "mclk_i2s0_2ch_in", "mclk_i2s1_2ch_in" - external I2S or
30                                               SPDIF clock        - optional
31    - "mac_clkin"                            - external MAC clock - optional
32
33properties:
34  compatible:
35    enum:
36      - rockchip,rk3308-cru
37
38  reg:
39    maxItems: 1
40
41  "#clock-cells":
42    const: 1
43
44  "#reset-cells":
45    const: 1
46
47  clocks:
48    maxItems: 1
49
50  clock-names:
51    const: xin24m
52
53  rockchip,grf:
54    $ref: /schemas/types.yaml#/definitions/phandle
55    description:
56      Phandle to the syscon managing the "general register files" (GRF),
57      if missing pll rates are not changeable, due to the missing pll
58      lock status.
59
60required:
61  - compatible
62  - reg
63  - "#clock-cells"
64  - "#reset-cells"
65
66additionalProperties: false
67
68examples:
69  - |
70    cru: clock-controller@ff500000 {
71      compatible = "rockchip,rk3308-cru";
72      reg = <0xff500000 0x1000>;
73      rockchip,grf = <&grf>;
74      #clock-cells = <1>;
75      #reset-cells = <1>;
76    };
77