device: make singular devices possible

Currently all devices have an id meaning that all devicenames
end with a number. This patch adds a DEVICE_ID_SINGLE to make
it ppossible to register a device without an id assigned to
it.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

1 files changed, 5 insertions, 0 deletions

diff --git a/include/driver.h b/include/driver.h
index 37620273af..4efa9642b8 100644
--- a/include/driver.h
+++ b/include/driver.h
@@ -126,6 +126,11 @@ struct driver_d {
 #define RW_SIZE(x)      (x)
 #define RW_SIZE_MASK    0x7
 
+/* dynamically assign the next free id */
+#define DEVICE_ID_DYNAMIC	-1
+/* do not use an id (only one device available */
+#define DEVICE_ID_SINGLE	-2
+
 /* Register devices and drivers.
  */
 int register_driver(struct driver_d *);