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https://github.com/torvalds/linux
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484468fb0f
The DT of_device.h and of_platform.h date back to the separate of_platform_bus_type before it as merged into the regular platform bus. As part of that merge prepping Arm DT support 13 years ago, they "temporarily" include each other. They also include platform_device.h and of.h. As a result, there's a pretty much random mix of those include files used throughout the tree. In order to detangle these headers and replace the implicit includes with struct declarations, users need to explicitly include the correct includes. Acked-by: Herve Codina <herve.codina@bootlin.com> Signed-off-by: Rob Herring <robh@kernel.org> Link: https://lore.kernel.org/r/20230718143027.1064731-1-robh@kernel.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
107 lines
2.6 KiB
C
107 lines
2.6 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* of.c The helpers for hcd device tree support
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*
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* Copyright (C) 2016 Freescale Semiconductor, Inc.
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* Author: Peter Chen <peter.chen@freescale.com>
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* Copyright (C) 2017 Johan Hovold <johan@kernel.org>
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*/
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#include <linux/of.h>
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#include <linux/usb/of.h>
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/**
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* usb_of_get_device_node() - get a USB device node
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* @hub: hub to which device is connected
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* @port1: one-based index of port
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*
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* Look up the node of a USB device given its parent hub device and one-based
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* port number.
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*
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* Return: A pointer to the node with incremented refcount if found, or
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* %NULL otherwise.
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*/
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struct device_node *usb_of_get_device_node(struct usb_device *hub, int port1)
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{
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struct device_node *node;
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u32 reg;
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for_each_child_of_node(hub->dev.of_node, node) {
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if (of_property_read_u32(node, "reg", ®))
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continue;
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if (reg == port1)
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return node;
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}
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return NULL;
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}
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EXPORT_SYMBOL_GPL(usb_of_get_device_node);
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/**
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* usb_of_has_combined_node() - determine whether a device has a combined node
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* @udev: USB device
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*
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* Determine whether a USB device has a so called combined node which is
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* shared with its sole interface. This is the case if and only if the device
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* has a node and its descriptors report the following:
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*
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* 1) bDeviceClass is 0 or 9, and
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* 2) bNumConfigurations is 1, and
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* 3) bNumInterfaces is 1.
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*
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* Return: True iff the device has a device node and its descriptors match the
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* criteria for a combined node.
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*/
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bool usb_of_has_combined_node(struct usb_device *udev)
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{
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struct usb_device_descriptor *ddesc = &udev->descriptor;
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struct usb_config_descriptor *cdesc;
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if (!udev->dev.of_node)
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return false;
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switch (ddesc->bDeviceClass) {
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case USB_CLASS_PER_INTERFACE:
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case USB_CLASS_HUB:
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if (ddesc->bNumConfigurations == 1) {
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cdesc = &udev->config->desc;
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if (cdesc->bNumInterfaces == 1)
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return true;
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}
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}
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return false;
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}
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EXPORT_SYMBOL_GPL(usb_of_has_combined_node);
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/**
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* usb_of_get_interface_node() - get a USB interface node
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* @udev: USB device of interface
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* @config: configuration value
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* @ifnum: interface number
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*
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* Look up the node of a USB interface given its USB device, configuration
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* value and interface number.
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*
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* Return: A pointer to the node with incremented refcount if found, or
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* %NULL otherwise.
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*/
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struct device_node *
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usb_of_get_interface_node(struct usb_device *udev, u8 config, u8 ifnum)
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{
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struct device_node *node;
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u32 reg[2];
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for_each_child_of_node(udev->dev.of_node, node) {
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if (of_property_read_u32_array(node, "reg", reg, 2))
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continue;
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if (reg[0] == ifnum && reg[1] == config)
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return node;
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}
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return NULL;
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}
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EXPORT_SYMBOL_GPL(usb_of_get_interface_node);
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