[PATCH 2/2] OMAP: omap_device: make all devices a child of a new omap_bus device

[Kevin Hilman <khilman@deeprootsystems.com>]

From: Kevin Hilman <khilman@ti.com>

In order to help differentiate omap_devices from normal
platform_devices, make them all a parent of a new omap_bus device.

Then, in order to determine if a platform_device is also an
omap_device, checking the parent is all that is needed.

Users of this feature are the runtime PM core for OMAP, where we need
to know if a device being passed in is an omap_device or not in order
to know whether to call the omap_device API with it.

In addition, all omap_devices will now show up under /sys/devices/omap
instead of /sys/devices/platform

Signed-off-by: Kevin Hilman <khilman@ti.com>
---
 arch/arm/plat-omap/include/plat/omap_device.h |    2 ++
 arch/arm/plat-omap/omap_device.c              |   18 ++++++++++++++++++
 2 files changed, 20 insertions(+), 0 deletions(-)

diff --git a/arch/arm/plat-omap/include/plat/omap_device.h b/arch/arm/plat-omap/include/plat/omap_device.h
index bad4c3d..26d0c10 100644
--- a/arch/arm/plat-omap/include/plat/omap_device.h
+++ b/arch/arm/plat-omap/include/plat/omap_device.h
@@ -36,6 +36,8 @@
 
 #include <plat/omap_hwmod.h>
 
+extern struct device omap_bus;
+
 /* omap_device._state values */
 #define OMAP_DEVICE_STATE_UNKNOWN	0
 #define OMAP_DEVICE_STATE_ENABLED	1
diff --git a/arch/arm/plat-omap/omap_device.c b/arch/arm/plat-omap/omap_device.c
index 7f05f49..3e215fa 100644
--- a/arch/arm/plat-omap/omap_device.c
+++ b/arch/arm/plat-omap/omap_device.c
@@ -463,8 +463,11 @@ int omap_early_device_register(struct omap_device *od)
  */
 int omap_device_register(struct omap_device *od)
 {
+	struct platform_device *pdev = &od->pdev;
+
 	pr_debug("omap_device: %s: registering\n", od->pdev.name);
 
+	pdev->dev.parent = &omap_bus;
 	return platform_device_register(&od->pdev);
 }
 
@@ -737,3 +740,18 @@ int omap_device_enable_clocks(struct omap_device *od)
 	/* XXX pass along return value here? */
 	return 0;
 }
+
+struct device omap_bus = {
+	.init_name	= "omap",
+};
+
+static int __init omap_device_init(void)
+{
+	int error = 0;
+
+	printk("%s:\n", __func__);
+	error = device_register(&omap_bus);
+
+	return error;
+}
+core_initcall(omap_device_init);
-- 
1.7.2.1