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 7title: Renesas R-Car USB 2.0 clock selector 8 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 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 34properties: 35 compatible: 36 items: 37 - enum: 38 - renesas,r8a7795-rcar-usb2-clock-sel # R-Car H3 39 - renesas,r8a7796-rcar-usb2-clock-sel # R-Car M3-W 40 - renesas,r8a77961-rcar-usb2-clock-sel # R-Car M3-W+ 41 - const: renesas,rcar-gen3-usb2-clock-sel 42 43 reg: 44 maxItems: 1 45 46 clocks: 47 minItems: 4 48 maxItems: 4 49 50 clock-names: 51 items: 52 - const: ehci_ohci 53 - const: hs-usb-if 54 - const: usb_extal 55 - const: usb_xtal 56 57 '#clock-cells': 58 const: 0 59 60 power-domains: 61 maxItems: 1 62 63 resets: 64 minItems: 2 65 maxItems: 2 66 67 reset-names: 68 items: 69 - const: ehci_ohci 70 - const: hs-usb-if 71 72required: 73 - compatible 74 - reg 75 - clocks 76 - clock-names 77 - '#clock-cells' 78 - power-domains 79 - resets 80 - reset-names 81 82additionalProperties: false 83 84examples: 85 - | 86 #include <dt-bindings/clock/r8a7795-cpg-mssr.h> 87 #include <dt-bindings/power/r8a7795-sysc.h> 88 89 usb2_clksel: clock-controller@e6590630 { 90 compatible = "renesas,r8a7795-rcar-usb2-clock-sel", 91 "renesas,rcar-gen3-usb2-clock-sel"; 92 reg = <0xe6590630 0x02>; 93 clocks = <&cpg CPG_MOD 703>, <&cpg CPG_MOD 704>, 94 <&usb_extal>, <&usb_xtal>; 95 clock-names = "ehci_ohci", "hs-usb-if", "usb_extal", "usb_xtal"; 96 #clock-cells = <0>; 97 power-domains = <&sysc R8A7795_PD_ALWAYS_ON>; 98 resets = <&cpg 703>, <&cpg 704>; 99 reset-names = "ehci_ohci", "hs-usb-if"; 100 }; 101