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1# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)2%YAML 1.23---4$id: http://devicetree.org/schemas/clock/renesas,rcar-usb2-clock-sel.yaml#5$schema: http://devicetree.org/meta-schemas/core.yaml#6 7title: Renesas R-Car USB 2.0 clock selector8 9maintainers:10 - Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>11 12description: |13 If you connect an external clock to the USB_EXTAL pin only, you should set14 the clock rate to "usb_extal" node only.15 If you connect an oscillator to both the USB_XTAL and USB_EXTAL, this module16 is not needed because this is default setting. (Of course, you can set the17 clock rates to both "usb_extal" and "usb_xtal" nodes.18 19 Case 1: An external clock connects to R-Car SoC20 +----------+ +--- 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 SoC28 +----------+ +--- R-Car ---------------------+29 |Oscillator|---|USB_EXTAL -+-> all usb channels|30 | |---|USB_XTAL --+ |31 +----------+ +-------------------------------+32 In this case, we don't need this selector.33 34properties:35 compatible:36 items:37 - enum:38 - renesas,r8a774a1-rcar-usb2-clock-sel # RZ/G2M39 - renesas,r8a774b1-rcar-usb2-clock-sel # RZ/G2N40 - renesas,r8a774e1-rcar-usb2-clock-sel # RZ/G2H41 - renesas,r8a7795-rcar-usb2-clock-sel # R-Car H342 - renesas,r8a7796-rcar-usb2-clock-sel # R-Car M3-W43 - renesas,r8a77961-rcar-usb2-clock-sel # R-Car M3-W+44 - const: renesas,rcar-gen3-usb2-clock-sel45 46 reg:47 maxItems: 148 49 clocks:50 maxItems: 451 52 clock-names:53 items:54 - const: ehci_ohci55 - const: hs-usb-if56 - const: usb_extal57 - const: usb_xtal58 59 '#clock-cells':60 const: 061 62 power-domains:63 maxItems: 164 65 resets:66 maxItems: 267 68 reset-names:69 items:70 - const: ehci_ohci71 - const: hs-usb-if72 73required:74 - compatible75 - reg76 - clocks77 - clock-names78 - '#clock-cells'79 - power-domains80 - resets81 - reset-names82 83additionalProperties: false84 85examples: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 };102