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usb: roles: get usb-role-switch from parent 

when the USB host controller is the parent of the connector,
usually type-B, sometimes don't need the graph, so we should
check whether it's parent registers usb-role-switch or not
firstly, and get it if exists.

Suggested-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Signed-off-by: Chunfeng Yun <chunfeng.yun@mediatek.com>
Link: https://lore.kernel.org/r/1567070558-29417-9-git-send-email-chunfeng.yun@mediatek.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Chunfeng Yun 2019-08-29 17:22:35 +08:00 committed by Greg Kroah-Hartman
parent c5c0283a9d
commit 6fadd72943
1 changed files with 21 additions and 4 deletions
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25
drivers/usb/roles/class.c
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@ -102,6 +102,19 @@ static void *usb_role_switch_match(struct device_connection *con, int ep,
return dev ? to_role_switch(dev) : ERR_PTR(-EPROBE_DEFER);
}
static struct usb_role_switch *
usb_role_switch_is_parent(struct fwnode_handle *fwnode)
{
struct fwnode_handle *parent = fwnode_get_parent(fwnode);
struct device *dev;
if (!parent || !fwnode_property_present(parent, "usb-role-switch"))
return NULL;
dev = class_find_device_by_fwnode(role_class, parent);
return dev ? to_role_switch(dev) : ERR_PTR(-EPROBE_DEFER);
}
/**
* usb_role_switch_get - Find USB role switch linked with the caller
* @dev: The caller device
@ -113,8 +126,10 @@ struct usb_role_switch *usb_role_switch_get(struct device *dev)
{
struct usb_role_switch *sw;
sw = device_connection_find_match(dev, "usb-role-switch", NULL,
usb_role_switch_match);
sw = usb_role_switch_is_parent(dev_fwnode(dev));
if (!sw)
sw = device_connection_find_match(dev, "usb-role-switch", NULL,
usb_role_switch_match);
if (!IS_ERR_OR_NULL(sw))
WARN_ON(!try_module_get(sw->dev.parent->driver->owner));
@ -134,8 +149,10 @@ struct usb_role_switch *fwnode_usb_role_switch_get(struct fwnode_handle *fwnode)
{
struct usb_role_switch *sw;
sw = fwnode_connection_find_match(fwnode, "usb-role-switch", NULL,
usb_role_switch_match);
sw = usb_role_switch_is_parent(fwnode);
if (!sw)
sw = fwnode_connection_find_match(fwnode, "usb-role-switch",
NULL, usb_role_switch_match);
if (!IS_ERR_OR_NULL(sw))
WARN_ON(!try_module_get(sw->dev.parent->driver->owner));