[PATCH 9/9] tty_port: register tty ports with serdev bus

Rob Herring
2017-01-06T16:26:35Z

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-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
---
drivers/tty/tty_port.c | 14 +++++++++++++-
1 file changed, 13 insertions(+), 1 deletion(-)

diff --git a/drivers/tty/tty_port.c b/drivers/tty/tty_port.c
index 232a8cbf47bc..032786e5509e 100644
--- a/drivers/tty/tty_port.c
+++ b/drivers/tty/tty_port.c
@@ -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,
@@ -125,9 +126,17 @@ struct device *tty_port_register_device_attr(struct tty_port *port,
struct device *device, void *drvdata,
const struct attribute_group **attr_grp)
{
+ struct device *ttydev;
+
tty_port_link_device(port, driver, index);
- return tty_register_device_attr(driver, index, device, drvdata,
+ ttydev = tty_register_device_attr(driver, index, device, drvdata,
attr_grp);
+ if (!ttydev)
+ return NULL;
+
+ serdev_tty_port_register(port, device, driver, index);
+ return ttydev;
+
}
EXPORT_SYMBOL_GPL(tty_port_register_device_attr);

@@ -177,6 +186,9 @@ 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);
--
2.10.1