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* ehci_hcd_xilinx_of_probe - Probe method for the USB host controller
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* @op: pointer to the platform_device bound to the host controller
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* This function requests resources and sets up appropriate properties for the
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* host controller. Because the Xilinx USB host controller can be configured
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* as HS only or HS/FS only, it checks the configuration in the device tree
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* entry, and sets an appropriate value for hcd->has_tt.
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struct device_node *dn = op->dev.of_node;