UIO: allow binding uio_pdrv_genirq.c to devices using command line option

This adds ability to bind uio driver to given open firmware device
using command line option. Thus, userspace driver can be developed and
used without modifying the kernel.
Signed-off-by: Pavel Machek <pavel@denx.de>
Tested-by: Detlev Zundel <dzu@denx.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/uio/uio_pdrv_genirq.c

@@ -263,10 +263,14 @@ static const struct dev_pm_ops uio_pdrv_genirq_dev_pm_ops = {
 };
 
 #ifdef CONFIG_OF
-static const struct of_device_id uio_of_genirq_match[] = {
-	{ /* empty for now */ },
+static struct of_device_id uio_of_genirq_match[] = {
+	{ /* This is filled with module_parm */ },
+	{ /* Sentinel */ },
 };
 MODULE_DEVICE_TABLE(of, uio_of_genirq_match);
+
+module_param_string(of_id, uio_of_genirq_match[0].compatible, 128, 0);
+MODULE_PARM_DESC(of_id, "Openfirmware id of the device to be handled by uio");
 #else
 # define uio_of_genirq_match NULL
 #endif