path: root/drivers/gpu/host1x/bus.h
diff options
authorThierry Reding <>2014-12-18 15:29:14 +0100
committerThierry Reding <>2015-01-27 10:09:14 +0100
commitf4c5cf88fbd50e4779042268947b2e2f90c20484 (patch)
tree79a50b0a3ed21314f1893a7c9bea685df976b6d2 /drivers/gpu/host1x/bus.h
parent99d2cd81d7261e6ddd325189134faf752206bfe7 (diff)
gpu: host1x: Provide a proper struct bus_type
Previously the struct bus_type exported by the host1x infrastructure was only a very basic skeleton. Turn that implementation into a more full- fledged bus to support proper probe ordering and power management. Note that the bus infrastructure needs to be available before any of the drivers can be registered. This is automatically ensured if all drivers are built as loadable modules (via symbol dependencies). If all drivers are built-in there are no such guarantees and the link order determines the initcall ordering. Adjust drivers/gpu/Makefile to make sure that the host1x bus infrastructure is initialized prior to any of its users (only drm/tegra currently). v2: Fix building host1x and tegra-drm as modules Reported-by: Dave Airlie <> Reviewed-by: Sean Paul <> Reviewed-by: Mark Zhang <> Signed-off-by: Thierry Reding <>
Diffstat (limited to 'drivers/gpu/host1x/bus.h')
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/gpu/host1x/bus.h b/drivers/gpu/host1x/bus.h
index 4099e99212c8..88fb1c4aac68 100644
--- a/drivers/gpu/host1x/bus.h
+++ b/drivers/gpu/host1x/bus.h
@@ -18,10 +18,10 @@
#ifndef HOST1X_BUS_H
#define HOST1X_BUS_H
+struct bus_type;
struct host1x;
-int host1x_bus_init(void);
-void host1x_bus_exit(void);
+extern struct bus_type host1x_bus_type;
int host1x_register(struct host1x *host1x);
int host1x_unregister(struct host1x *host1x);