Hi Heikki,
Heikki Krogerus <heikki.krogerus@xxxxxxxxxxxxxxx> 于2018年10月24日周三 下午11:06写道：
>
> When the connections are defined in firmware, struct
> device_connection will have the fwnode member pointing to
> the device node (struct fwnode_handle) of the requested
> device, and the endpoint will not be used at all in that
> case.
>
> Signed-off-by: Heikki Krogerus <heikki.krogerus@xxxxxxxxxxxxxxx>
> ---
> drivers/usb/common/roles.c | 16 +++++++++++++---
> 1 file changed, 13 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/usb/common/roles.c b/drivers/usb/common/roles.c
> index 99116af07f1d..bb52e006d203 100644
> --- a/drivers/usb/common/roles.c
> +++ b/drivers/usb/common/roles.c
> @@ -8,6 +8,7 @@
> */
>
> #include <linux/usb/role.h>
> +#include <linux/property.h>
> #include <linux/device.h>
> #include <linux/module.h>
> #include <linux/mutex.h>
> @@ -84,7 +85,12 @@ enum usb_role usb_role_switch_get_role(struct usb_role_switch *sw)
> }
> EXPORT_SYMBOL_GPL(usb_role_switch_get_role);
>
> -static int __switch_match(struct device *dev, const void *name)
> +static int switch_fwnode_match(struct device *dev, const void *fwnode)
> +{
> + return dev_fwnode(dev) == fwnode;
Seems this should be dev_fwnode(dev->parent) == fwnode;
The role switch is the child dev of the caller of usb_role_switch_register().
Li Jun
> +}
> +
> +static int switch_name_match(struct device *dev, const void *name)
> {
> return !strcmp((const char *)name, dev_name(dev));
> }
> @@ -94,8 +100,12 @@ static void *usb_role_switch_match(struct device_connection *con, int ep,
> {
> struct device *dev;
>
> - dev = class_find_device(role_class, NULL, con->endpoint[ep],
> - __switch_match);
> + if (con->fwnode)
> + dev = class_find_device(role_class, NULL, con->fwnode,
> + switch_fwnode_match);
> + else
> + dev = class_find_device(role_class, NULL, con->endpoint[ep],
> + switch_name_match);
>
> return dev ? to_role_switch(dev) : ERR_PTR(-EPROBE_DEFER);
> }
> --
> 2.19.1
>
