hwrng: OMAP: remove SoC restrictions from driver registration

Remove the SoC restriction code from the OMAP RNG driver.  The
integration code in arch/arm/*omap* should handle this.  The device
shouldn't be created if it doesn't exist on the currently-booted SoC.

This allows us to remove some OMAP-specific cpu_is_omap*() calls from
the driver.  Also, if other OMAP chips have RNGs that can be used
by Linux, there will be no need to modify the driver.
Signed-off-by: NPaul Walmsley <paul@pwsan.com>
Cc: Matt Mackall <mpm@selenic.com>
Cc: Herbert Xu <herbert@gondor.apana.org.au>
Acked-by: NHerbert Xu <herbert@gondor.apana.org.au>

arch/arm/mach-omap1/devices.c

@@ -376,6 +376,9 @@ static struct platform_device omap1_rng_device = {
 
 static void omap1_init_rng(void)
 {
+	if (!cpu_is_omap16xx())
+		return;
+
 	(void) platform_device_register(&omap1_rng_device);
 }
 

drivers/char/hw_random/omap-rng.c

@@ -220,9 +220,6 @@ static struct platform_driver omap_rng_driver = {
 
 static int __init omap_rng_init(void)
 {
-	if (!cpu_is_omap16xx() && !cpu_is_omap24xx())
-		return -ENODEV;
-
 	return platform_driver_register(&omap_rng_driver);
 }