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The USB 3.0 PHY modules of R-Car Gen3 SoCs have: - Spread spectrum clock (ssc). - Using USB 2.0 EXTAL clock instead of USB 3.0 clock. - Enabling VBUS detection for usb3.0 peripheral. So, this driver supports these features. Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com> Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
47 lines
1.7 KiB
Plaintext
47 lines
1.7 KiB
Plaintext
* Renesas R-Car generation 3 USB 3.0 PHY
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This file provides information on what the device node for the R-Car generation
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3 USB 3.0 PHY contains.
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If you want to enable spread spectrum clock (ssc), you should use USB_EXTAL
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instead of USB3_CLK. However, if you don't want to these features, you don't
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need this driver.
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Required properties:
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- compatible: "renesas,r8a7795-usb3-phy" if the device is a part of an R8A7795
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SoC.
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"renesas,r8a7796-usb3-phy" if the device is a part of an R8A7796
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SoC.
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"renesas,rcar-gen3-usb3-phy" for a generic R-Car Gen3 compatible
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device.
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When compatible with the generic version, nodes must list the
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SoC-specific version corresponding to the platform first
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followed by the generic version.
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- reg: offset and length of the USB 3.0 PHY register block.
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- clocks: A list of phandles and clock-specifier pairs.
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- clock-names: Name of the clocks.
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- The funcional clock must be "usb3-if".
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- The usb3's external clock must be "usb3s_clk".
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- The usb2's external clock must be "usb_extal". If you want to use the ssc,
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the clock-frequency must not be 0.
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- #phy-cells: see phy-bindings.txt in the same directory, must be <0>.
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Optional properties:
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- renesas,ssc-range: Enable/disable spread spectrum clock (ssc) by using
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the following values as u32:
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- 0 (or the property doesn't exist): disable the ssc
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- 4980: enable the ssc as -4980 ppm
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- 4492: enable the ssc as -4492 ppm
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- 4003: enable the ssc as -4003 ppm
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Example (R-Car H3):
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usb-phy@e65ee000 {
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compatible = "renesas,r8a7795-usb3-phy",
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"renesas,rcar-gen3-usb3-phy";
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reg = <0 0xe65ee000 0 0x90>;
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clocks = <&cpg CPG_MOD 328>, <&usb3s0_clk>, <&usb_extal>;
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clock-names = "usb3-if", "usb3s_clk", "usb_extal";
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};
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