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tty_port: register tty ports with serdev bus

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Register a serdev controller with the serdev bus when a tty_port is
registered. This creates the serdev controller and create's serdev
devices for any DT child nodes of the tty_port's parent (i.e. the UART
device).

Signed-off-by: Rob Herring <robh@kernel.org>
Reviewed-By: Sebastian Reichel <sre@kernel.org>
Tested-By: Sebastian Reichel <sre@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Rob Herring 2017-02-02 13:48:09 -06:00 committed by Greg Kroah-Hartman
parent bed35c6dfa
commit 8ee3fde047
1 changed files with 12 additions and 0 deletions
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12
drivers/tty/tty_port.c
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@ -16,6 +16,7 @@
#include <linux/bitops.h>
#include <linux/delay.h>
#include <linux/module.h>
#include <linux/serdev.h>
static int tty_port_default_receive_buf(struct tty_port *port,
const unsigned char *p,
@ -128,7 +129,15 @@ struct device *tty_port_register_device_attr(struct tty_port *port,
struct device *device, void *drvdata,
const struct attribute_group **attr_grp)
{
struct device *dev;
tty_port_link_device(port, driver, index);
dev = serdev_tty_port_register(port, device, driver, index);
if (PTR_ERR(dev) != -ENODEV)
/* Skip creating cdev if we registered a serdev device */
return dev;
return tty_register_device_attr(driver, index, device, drvdata,
attr_grp);
}
@ -180,6 +189,9 @@ static void tty_port_destructor(struct kref *kref)
/* check if last port ref was dropped before tty release */
if (WARN_ON(port->itty))
return;
serdev_tty_port_unregister(port);
if (port->xmit_buf)
free_page((unsigned long)port->xmit_buf);
tty_port_destroy(port);