usb/core/of.c

1 // SPDX-License-Identifier: GPL-2.0
14  * usb_of_get_device_node() - get a USB device node
16  * @port1: one-based index of port
18  * Look up the node of a USB device given its parent hub device and one-based
21  * Return: A pointer to the node with incremented refcount if found, or
26 	struct device_node *node;  in usb_of_get_device_node()  local
29 	for_each_child_of_node(hub->dev.of_node, node) {  in usb_of_get_device_node()
30 		if (of_property_read_u32(node, "reg", &reg))  in usb_of_get_device_node()
34 			return node;  in usb_of_get_device_node()
42  * usb_of_has_combined_node() - determine whether a device has a combined node
45  * Determine whether a USB device has a so called combined node which is
46  * shared with its sole interface. This is the case if and only if the device
47  * has a node and its descriptors report the following:
53  * Return: True iff the device has a device node and its descriptors match the
54  * criteria for a combined node.
58 	struct usb_device_descriptor *ddesc = &udev->descriptor;  in usb_of_has_combined_node()
61 	if (!udev->dev.of_node)  in usb_of_has_combined_node()
64 	switch (ddesc->bDeviceClass) {  in usb_of_has_combined_node()
67 		if (ddesc->bNumConfigurations == 1) {  in usb_of_has_combined_node()
68 			cdesc = &udev->config->desc;  in usb_of_has_combined_node()
69 			if (cdesc->bNumInterfaces == 1)  in usb_of_has_combined_node()
79  * usb_of_get_interface_node() - get a USB interface node
80  * @udev: USB device of interface
82  * @ifnum: interface number
84  * Look up the node of a USB interface given its USB device, configuration
85  * value and interface number.
87  * Return: A pointer to the node with incremented refcount if found, or
93 	struct device_node *node;  in usb_of_get_interface_node()  local
96 	for_each_child_of_node(udev->dev.of_node, node) {  in usb_of_get_interface_node()
97 		if (of_property_read_u32_array(node, "reg", reg, 2))  in usb_of_get_interface_node()
101 			return node;  in usb_of_get_interface_node()