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

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Date:   Fri,  6 Jan 2017 10:26:35 -0600
From:   Rob Herring <robh@...nel.org>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Marcel Holtmann <marcel@...tmann.org>,
        Jiri Slaby <jslaby@...e.com>,
        Sebastian Reichel <sre@...nel.org>,
        Arnd Bergmann <arnd@...db.de>,
        "Dr . H . Nikolaus Schaller" <hns@...delico.com>,
        Peter Hurley <peter@...leysoftware.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Alan Cox <gnomes@...rguk.ukuu.org.uk>
Cc:     Loic Poulain <loic.poulain@...el.com>, Pavel Machek <pavel@....cz>,
        NeilBrown <neil@...wn.name>,
        Linus Walleij <linus.walleij@...aro.org>,
        linux-bluetooth@...r.kernel.org, linux-serial@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH 9/9] 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@...nel.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