1 # SPDX-License-Identifier: (GPL-2.0+ OR MIT)
2 %YAML 1.2
3 ---
4 $id: http://devicetree.org/schemas/clock/rockchip,rk3228-cru.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
6
7 title: Rockchip RK3228 Clock and Reset Unit (CRU)
8
9 maintainers:
10 - Elaine Zhang <zhangqing@rock-chips.com>
11 - Heiko Stuebner <heiko@sntech.de>
12
13 description: |
14 The RK3228 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/rk3228-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 - "ext_i2s" - external I2S clock - optional
27 - "ext_gmac" - external GMAC clock - optional
28 - "ext_hsadc" - external HSADC clock - optional
29 - "phy_50m_out" - output clock of the pll in the mac phy
30
31 properties:
32 compatible:
33 enum:
34 - rockchip,rk3228-cru
35
36 reg:
37 maxItems: 1
38
39 "#clock-cells":
40 const: 1
41
42 "#reset-cells":
43 const: 1
44
45 clocks:
46 maxItems: 1
47
48 clock-names:
49 const: xin24m
50
51 rockchip,grf:
52 $ref: /schemas/types.yaml#/definitions/phandle
53 description:
54 Phandle to the syscon managing the "general register files" (GRF),
55 if missing pll rates are not changeable, due to the missing pll
56 lock status.
57
58 required:
59 - compatible
60 - reg
61 - "#clock-cells"
62 - "#reset-cells"
63
64 additionalProperties: false
65
66 examples:
67 - |
68 cru: clock-controller@20000000 {
69 compatible = "rockchip,rk3228-cru";
70 reg = <0x20000000 0x1000>;
71 rockchip,grf = <&grf>;
72 #clock-cells = <1>;
73 #reset-cells = <1>;
74 };
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