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tty/serdev: add serdev registration interface

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Add a new interface for registering a serdev controller and clients, and
a helper function to deregister serdev devices (or a tty device) that
were previously registered using the new interface.

Once every driver currently using the tty_port_register_device() helpers
have been vetted and converted to use the new serdev registration
interface (at least for deregistration), we can move serdev registration
to the current helpers and get rid of the serdev-specific functions.

Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Johan Hovold <johan@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Johan Hovold 2017-05-18 17:33:00 +02:00 • committed by Greg Kroah-Hartman
parent 6bdc00d01e
commit 8cde11b2ba
4 changed files with 93 additions and 4 deletions
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7
include/linux/serdev.h
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@ -308,7 +308,7 @@ struct tty_driver;
struct device *serdev_tty_port_register(struct tty_port *port,
struct device *parent,
struct tty_driver *drv, int idx);
void serdev_tty_port_unregister(struct tty_port *port);
int serdev_tty_port_unregister(struct tty_port *port);
#else
static inline struct device *serdev_tty_port_register(struct tty_port *port,
struct device *parent,
@ -316,7 +316,10 @@ static inline struct device *serdev_tty_port_register(struct tty_port *port,
{
return ERR_PTR(-ENODEV);
}
static inline void serdev_tty_port_unregister(struct tty_port *port) {}
static inline int serdev_tty_port_unregister(struct tty_port *port)
{
return -ENODEV;
}
#endif /* CONFIG_SERIAL_DEV_CTRL_TTYPORT */
#endif /*_LINUX_SERDEV_H */