diff options
| author | Yoshihiro Shimoda | 2017-02-21 11:59:47 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman | 2017-03-17 05:24:48 +0100 |
| commit | 5095cb89c62acc78b4cfaeb9a4072979d010510a (patch) | |
| tree | 1ce6f59d08f8cd1e4fff9f67f93e6f931aff4233 /drivers/usb/core | |
| parent | usbip: Fix implicit fallthrough warning (diff) | |
| download | kernel-qcow2-linux-5095cb89c62acc78b4cfaeb9a4072979d010510a.tar.gz kernel-qcow2-linux-5095cb89c62acc78b4cfaeb9a4072979d010510a.tar.xz kernel-qcow2-linux-5095cb89c62acc78b4cfaeb9a4072979d010510a.zip | |
usb: of: add functions to bind a companion controller
EHCI controllers will have a companion controller. However, on platform
bus, there was difficult to bind them in previous code. So, this
patch adds helper functions to bind them using a "companion" property.
Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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); |