diff options
Diffstat (limited to 'drivers/usb/core')
| -rw-r--r-- | drivers/usb/core/of.c | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/drivers/usb/core/of.c b/drivers/usb/core/of.c index 3de4f8873984..d787f195a9a6 100644 --- a/drivers/usb/core/of.c +++ b/drivers/usb/core/of.c @@ -18,6 +18,7 @@ */ #include <linux/of.h> +#include <linux/of_platform.h> #include <linux/usb/of.h> /** @@ -46,3 +47,25 @@ struct device_node *usb_of_get_child_node(struct device_node *parent, } EXPORT_SYMBOL_GPL(usb_of_get_child_node); +/** + * usb_of_get_companion_dev - Find the companion device + * @dev: the device pointer to find a companion + * + * Find the companion device from platform bus. + * + * Return: On success, a pointer to the companion device, %NULL on failure. + */ +struct device *usb_of_get_companion_dev(struct device *dev) +{ + struct device_node *node; + struct platform_device *pdev = NULL; + + node = of_parse_phandle(dev->of_node, "companion", 0); + if (node) + pdev = of_find_device_by_node(node); + + of_node_put(node); + + return pdev ? &pdev->dev : NULL; +} +EXPORT_SYMBOL_GPL(usb_of_get_companion_dev); |