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Add DT nodes for Tegra USB PHY along with related documentation. Also added a phandle property to controller DT node, for referring to connected PHY instance. Signed-off-by: Venu Byravarasu <vbyravarasu@nvidia.com> Signed-off-by: Stephen Warren <swarren@nvidia.com>
33 lines
1.5 KiB
Plaintext
33 lines
1.5 KiB
Plaintext
Tegra SOC USB controllers
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The device node for a USB controller that is part of a Tegra
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SOC is as described in the document "Open Firmware Recommended
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Practice : Universal Serial Bus" with the following modifications
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and additions :
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Required properties :
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- compatible : Should be "nvidia,tegra20-ehci" for USB controllers
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used in host mode.
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- phy_type : Should be one of "ulpi" or "utmi".
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- nvidia,vbus-gpio : If present, specifies a gpio that needs to be
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activated for the bus to be powered.
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- nvidia,phy : phandle of the PHY instance, the controller is connected to.
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Required properties for phy_type == ulpi:
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- nvidia,phy-reset-gpio : The GPIO used to reset the PHY.
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Optional properties:
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- dr_mode : dual role mode. Indicates the working mode for
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nvidia,tegra20-ehci compatible controllers. Can be "host", "peripheral",
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or "otg". Default to "host" if not defined for backward compatibility.
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host means this is a host controller
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peripheral means it is device controller
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otg means it can operate as either ("on the go")
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- nvidia,has-legacy-mode : boolean indicates whether this controller can
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operate in legacy mode (as APX 2500 / 2600). In legacy mode some
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registers are accessed through the APB_MISC base address instead of
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the USB controller. Since this is a legacy issue it probably does not
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warrant a compatible string of its own.
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- nvidia,needs-double-reset : boolean is to be set for some of the Tegra2
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USB ports, which need reset twice due to hardware issues.
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