tty_port: register tty ports with serdev bus

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>

diff --git a/drivers/tty/tty_port.c b/drivers/tty/tty_port.c
index 8d9886b..5cd3cd9 100644 (file)
--- 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,
@@ -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);