1 # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
2 %YAML 1.2
3 ---
4 $id: http://devicetree.org/schemas/clock/renesas,rcar-usb2-clock-sel.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
6
7 title: Renesas R-Car USB 2.0 clock selector
8
9 maintainers:
10 - Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
11
12 description: |
13 If you connect an external clock to the USB_EXTAL pin only, you should set
14 the clock rate to "usb_extal" node only.
15 If you connect an oscillator to both the USB_XTAL and USB_EXTAL, this module
16 is not needed because this is default setting. (Of course, you can set the
17 clock rates to both "usb_extal" and "usb_xtal" nodes.
18
19 Case 1: An external clock connects to R-Car SoC
20 +----------+ +--- R-Car ---------------------+
21 |External |---|USB_EXTAL ---> all usb channels|
22 |clock | |USB_XTAL |
23 +----------+ +-------------------------------+
24
25 In this case, we need this driver with "usb_extal" clock.
26
27 Case 2: An oscillator connects to R-Car SoC
28 +----------+ +--- R-Car ---------------------+
29 |Oscillator|---|USB_EXTAL -+-> all usb channels|
30 | |---|USB_XTAL --+ |
31 +----------+ +-------------------------------+
32 In this case, we don't need this selector.
33
34 properties:
35 compatible:
36 items:
37 - enum:
38 - renesas,r8a774a1-rcar-usb2-clock-sel # RZ/G2M
39 - renesas,r8a774b1-rcar-usb2-clock-sel # RZ/G2N
40 - renesas,r8a774e1-rcar-usb2-clock-sel # RZ/G2H
41 - renesas,r8a7795-rcar-usb2-clock-sel # R-Car H3
42 - renesas,r8a7796-rcar-usb2-clock-sel # R-Car M3-W
43 - renesas,r8a77961-rcar-usb2-clock-sel # R-Car M3-W+
44 - const: renesas,rcar-gen3-usb2-clock-sel
45
46 reg:
47 maxItems: 1
48
49 clocks:
50 maxItems: 4
51
52 clock-names:
53 items:
54 - const: ehci_ohci
55 - const: hs-usb-if
56 - const: usb_extal
57 - const: usb_xtal
58
59 '#clock-cells':
60 const: 0
61
62 power-domains:
63 maxItems: 1
64
65 resets:
66 maxItems: 2
67
68 reset-names:
69 items:
70 - const: ehci_ohci
71 - const: hs-usb-if
72
73 required:
74 - compatible
75 - reg
76 - clocks
77 - clock-names
78 - '#clock-cells'
79 - power-domains
80 - resets
81 - reset-names
82
83 additionalProperties: false
84
85 examples:
86 - |
87 #include <dt-bindings/clock/r8a7795-cpg-mssr.h>
88 #include <dt-bindings/power/r8a7795-sysc.h>
89
90 usb2_clksel: clock-controller@e6590630 {
91 compatible = "renesas,r8a7795-rcar-usb2-clock-sel",
92 "renesas,rcar-gen3-usb2-clock-sel";
93 reg = <0xe6590630 0x02>;
94 clocks = <&cpg CPG_MOD 703>, <&cpg CPG_MOD 704>,
95 <&usb_extal>, <&usb_xtal>;
96 clock-names = "ehci_ohci", "hs-usb-if", "usb_extal", "usb_xtal";
97 #clock-cells = <0>;
98 power-domains = <&sysc R8A7795_PD_ALWAYS_ON>;
99 resets = <&cpg 703>, <&cpg 704>;
100 reset-names = "ehci_ohci", "hs-usb-if";
101 };
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