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103 lines
2.9 KiB
103 lines
2.9 KiB
# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) |
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%YAML 1.2 |
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--- |
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$id: "http://devicetree.org/schemas/clock/renesas,rcar-usb2-clock-sel.yaml#" |
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$schema: "http://devicetree.org/meta-schemas/core.yaml#" |
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title: Renesas R-Car USB 2.0 clock selector |
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maintainers: |
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- Yoshihiro Shimoda <[email protected]> |
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description: | |
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If you connect an external clock to the USB_EXTAL pin only, you should set |
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the clock rate to "usb_extal" node only. |
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If you connect an oscillator to both the USB_XTAL and USB_EXTAL, this module |
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is not needed because this is default setting. (Of course, you can set the |
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clock rates to both "usb_extal" and "usb_xtal" nodes. |
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Case 1: An external clock connects to R-Car SoC |
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+----------+ +--- R-Car ---------------------+ |
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|External |---|USB_EXTAL ---> all usb channels| |
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|clock | |USB_XTAL | |
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+----------+ +-------------------------------+ |
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In this case, we need this driver with "usb_extal" clock. |
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Case 2: An oscillator connects to R-Car SoC |
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+----------+ +--- R-Car ---------------------+ |
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|Oscillator|---|USB_EXTAL -+-> all usb channels| |
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| |---|USB_XTAL --+ | |
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+----------+ +-------------------------------+ |
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In this case, we don't need this selector. |
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properties: |
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compatible: |
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items: |
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- enum: |
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- renesas,r8a774a1-rcar-usb2-clock-sel # RZ/G2M |
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- renesas,r8a774b1-rcar-usb2-clock-sel # RZ/G2N |
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- renesas,r8a774e1-rcar-usb2-clock-sel # RZ/G2H |
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- renesas,r8a7795-rcar-usb2-clock-sel # R-Car H3 |
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- renesas,r8a7796-rcar-usb2-clock-sel # R-Car M3-W |
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- renesas,r8a77961-rcar-usb2-clock-sel # R-Car M3-W+ |
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- const: renesas,rcar-gen3-usb2-clock-sel |
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reg: |
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maxItems: 1 |
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clocks: |
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minItems: 4 |
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maxItems: 4 |
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clock-names: |
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items: |
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- const: ehci_ohci |
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- const: hs-usb-if |
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- const: usb_extal |
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- const: usb_xtal |
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'#clock-cells': |
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const: 0 |
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power-domains: |
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maxItems: 1 |
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resets: |
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minItems: 2 |
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maxItems: 2 |
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reset-names: |
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items: |
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- const: ehci_ohci |
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- const: hs-usb-if |
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required: |
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- compatible |
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- reg |
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- clocks |
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- clock-names |
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- '#clock-cells' |
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- power-domains |
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- resets |
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- reset-names |
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additionalProperties: false |
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examples: |
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- | |
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#include <dt-bindings/clock/r8a7795-cpg-mssr.h> |
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#include <dt-bindings/power/r8a7795-sysc.h> |
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usb2_clksel: clock-controller@e6590630 { |
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compatible = "renesas,r8a7795-rcar-usb2-clock-sel", |
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"renesas,rcar-gen3-usb2-clock-sel"; |
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reg = <0xe6590630 0x02>; |
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clocks = <&cpg CPG_MOD 703>, <&cpg CPG_MOD 704>, |
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<&usb_extal>, <&usb_xtal>; |
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clock-names = "ehci_ohci", "hs-usb-if", "usb_extal", "usb_xtal"; |
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#clock-cells = <0>; |
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power-domains = <&sysc R8A7795_PD_ALWAYS_ON>; |
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resets = <&cpg 703>, <&cpg 704>; |
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reset-names = "ehci_ohci", "hs-usb-if"; |
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};
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