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From: Luiz Otavio O Souza <loos@FreeBSD.org>
Date: Sat, 31 Jan 2015 15:50:19 +0000 (UTC)
To: src-committers@freebsd.org, svn-src-all@freebsd.org,
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Subject: svn commit: r277980 - head/sys/dev/gpio
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Author: loos
Date: Sat Jan 31 15:50:19 2015
New Revision: 277980
URL: https://svnweb.freebsd.org/changeset/base/277980

Log:
  Implement a new method to retrieve the gpiobus reference from a GPIO
  controller.
  
  The gpiobus is responsible to keep track of the used pins and serialize
  the access to pins.
  
  Some of these features are important to devices that do not descend
  directly from gpiobus and as such cannot make use of its features (one
  classic example is gpioc that is attached to the GPIO controller and could
  not, until now, make use of the gpiobus locking).

Modified:
  head/sys/dev/gpio/gpio_if.m

Modified: head/sys/dev/gpio/gpio_if.m
==============================================================================
--- head/sys/dev/gpio/gpio_if.m	Sat Jan 31 15:41:01 2015	(r277979)
+++ head/sys/dev/gpio/gpio_if.m	Sat Jan 31 15:50:19 2015	(r277980)
@@ -32,6 +32,13 @@
 INTERFACE gpio;
 
 CODE {
+	static device_t
+	gpio_default_get_bus(void)
+	{
+
+		return (NULL);
+	}
+
 	static int
 	gpio_default_map_gpios(device_t bus, phandle_t dev,
 	    phandle_t gparent, int gcells, pcell_t *gpios, uint32_t *pin,
@@ -56,6 +63,13 @@ HEADER {
 };
 
 #
+# Return the gpiobus device reference
+#
+METHOD device_t get_bus {
+	device_t dev;
+} DEFAULT gpio_default_get_bus;
+
+#
 # Get maximum pin number
 #
 METHOD int pin_max {