| Tom Rini | 53633a8 | 2024-02-29 12:33:36 -0500 | [diff] [blame^] | 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 | }; |