drivers: net: ppp: configurable autostart

New Kconfig CONFIG_PPP_NET_IF_NO_AUTO_START
to have an option to disable of starting of the PPP networking interface
right after the init.

Signed-off-by: Jani Hirsimäki <[email protected]>

Author: jhirsi

drivers/net/Kconfig

@@ -83,6 +83,12 @@ config PPP_CLIENT_CLIENTSERVER
 	  This is only necessary if a ppp connection should be
 	  established with a Microsoft Windows PC.
 
+config PPP_NET_IF_NO_AUTO_START
+	bool "Disable PPP interface auto-start"
+	help
+	  This option allows user to disable autostarting of the PPP interface
+	  immediately after initialization.
+
 module = NET_PPP
 module-dep = LOG
 module-str = Log level for ppp driver

drivers/net/ppp.c

@@ -781,10 +781,12 @@ static void ppp_iface_init(struct net_if *iface)
 
 	memset(ppp->buf, 0, sizeof(ppp->buf));
 
-	/* If we have a GSM modem with PPP support, then do not start the
-	 * interface automatically but only after the modem is ready.
+	/* If we have a GSM modem with PPP support or interface autostart is disabled
+	 * from Kconfig, then do not start the interface automatically but only
+	 * after the modem is ready or when manually started.
 	 */
-	if (IS_ENABLED(CONFIG_MODEM_GSM_PPP)) {
+	if (IS_ENABLED(CONFIG_MODEM_GSM_PPP) ||
+	    IS_ENABLED(CONFIG_PPP_NET_IF_NO_AUTO_START)) {
 		net_if_flag_set(iface, NET_IF_NO_AUTO_START);
 	}
 }