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authorDavid Brownell <dbrownell@users.sourceforge.net>2008-10-16 01:03:13 -0400
committerLinus Torvalds <torvalds@linux-foundation.org>2008-10-16 14:21:40 -0400
commit2f8d11971b9f54362437ce70f4d1911f0996d542 (patch)
tree48fb0df29994e976325761bd9e07ce107a96b6d5 /drivers/gpio/pca953x.c
parent3d599d1ca57f443e5c4ff5af1e69d90350082f77 (diff)
gpio: i2c expanders use subsys_init
Make the I2C external GPIO expander drivers register themselves at subsys_initcall() time when they're statically linked. SOC-integrated GPIOs are available starting very early -- early in arch_initcall() at latest, but often even before initcalls start to run -- so this improves consistency, so more subsystems can rely on GPIOs in their own subsys_initcall() code. (This isn't a theoretical problem. This is one of several patches needed to resolve oopsing observed when statically linking kernels on a DaVinci EVM. Its pcf857x GPIOs needed to be available well before some other drivers initialized.) Signed-off-by: David Brownell <dbrownell@users.sourceforge.net> Cc: Jean Delvare <khali@linux-fr.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/gpio/pca953x.c')
-rw-r--r--drivers/gpio/pca953x.c5
1 files changed, 4 insertions, 1 deletions
diff --git a/drivers/gpio/pca953x.c b/drivers/gpio/pca953x.c
index cc8468692ae0..9ceeb89f1325 100644
--- a/drivers/gpio/pca953x.c
+++ b/drivers/gpio/pca953x.c
@@ -289,7 +289,10 @@ static int __init pca953x_init(void)
289{ 289{
290 return i2c_add_driver(&pca953x_driver); 290 return i2c_add_driver(&pca953x_driver);
291} 291}
292module_init(pca953x_init); 292/* register after i2c postcore initcall and before
293 * subsys initcalls that may rely on these GPIOs
294 */
295subsys_initcall(pca953x_init);
293 296
294static void __exit pca953x_exit(void) 297static void __exit pca953x_exit(void)
295{ 298{