0001 # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
0002 %YAML 1.2
0003 ---
0004 $id: "http://devicetree.org/schemas/clock/renesas,rcar-usb2-clock-sel.yaml#"
0005 $schema: "http://devicetree.org/meta-schemas/core.yaml#"
0006
0007 title: Renesas R-Car USB 2.0 clock selector
0008
0009 maintainers:
0010 - Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
0011
0012 description: |
0013 If you connect an external clock to the USB_EXTAL pin only, you should set
0014 the clock rate to "usb_extal" node only.
0015 If you connect an oscillator to both the USB_XTAL and USB_EXTAL, this module
0016 is not needed because this is default setting. (Of course, you can set the
0017 clock rates to both "usb_extal" and "usb_xtal" nodes.
0018
0019 Case 1: An external clock connects to R-Car SoC
0020 +----------+ +--- R-Car ---------------------+
0021 |External |---|USB_EXTAL ---> all usb channels|
0022 |clock | |USB_XTAL |
0023 +----------+ +-------------------------------+
0024
0025 In this case, we need this driver with "usb_extal" clock.
0026
0027 Case 2: An oscillator connects to R-Car SoC
0028 +----------+ +--- R-Car ---------------------+
0029 |Oscillator|---|USB_EXTAL -+-> all usb channels|
0030 | |---|USB_XTAL --+ |
0031 +----------+ +-------------------------------+
0032 In this case, we don't need this selector.
0033
0034 properties:
0035 compatible:
0036 items:
0037 - enum:
0038 - renesas,r8a774a1-rcar-usb2-clock-sel # RZ/G2M
0039 - renesas,r8a774b1-rcar-usb2-clock-sel # RZ/G2N
0040 - renesas,r8a774e1-rcar-usb2-clock-sel # RZ/G2H
0041 - renesas,r8a7795-rcar-usb2-clock-sel # R-Car H3
0042 - renesas,r8a7796-rcar-usb2-clock-sel # R-Car M3-W
0043 - renesas,r8a77961-rcar-usb2-clock-sel # R-Car M3-W+
0044 - const: renesas,rcar-gen3-usb2-clock-sel
0045
0046 reg:
0047 maxItems: 1
0048
0049 clocks:
0050 minItems: 4
0051 maxItems: 4
0052
0053 clock-names:
0054 items:
0055 - const: ehci_ohci
0056 - const: hs-usb-if
0057 - const: usb_extal
0058 - const: usb_xtal
0059
0060 '#clock-cells':
0061 const: 0
0062
0063 power-domains:
0064 maxItems: 1
0065
0066 resets:
0067 minItems: 2
0068 maxItems: 2
0069
0070 reset-names:
0071 items:
0072 - const: ehci_ohci
0073 - const: hs-usb-if
0074
0075 required:
0076 - compatible
0077 - reg
0078 - clocks
0079 - clock-names
0080 - '#clock-cells'
0081 - power-domains
0082 - resets
0083 - reset-names
0084
0085 additionalProperties: false
0086
0087 examples:
0088 - |
0089 #include <dt-bindings/clock/r8a7795-cpg-mssr.h>
0090 #include <dt-bindings/power/r8a7795-sysc.h>
0091
0092 usb2_clksel: clock-controller@e6590630 {
0093 compatible = "renesas,r8a7795-rcar-usb2-clock-sel",
0094 "renesas,rcar-gen3-usb2-clock-sel";
0095 reg = <0xe6590630 0x02>;
0096 clocks = <&cpg CPG_MOD 703>, <&cpg CPG_MOD 704>,
0097 <&usb_extal>, <&usb_xtal>;
0098 clock-names = "ehci_ohci", "hs-usb-if", "usb_extal", "usb_xtal";
0099 #clock-cells = <0>;
0100 power-domains = <&sysc R8A7795_PD_ALWAYS_ON>;
0101 resets = <&cpg 703>, <&cpg 704>;
0102 reset-names = "ehci_ohci", "hs-usb-if";
0103 };
