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gpio: i2c expanders use subsys_init

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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>
This commit is contained in:
David Brownell 2008-10-15 22:03:13 -07:00 committed by Linus Torvalds
parent 3d599d1ca5
commit 2f8d11971b
3 changed files with 12 additions and 3 deletions
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5
drivers/gpio/max732x.c
View File

@ -372,7 +372,10 @@ static int __init max732x_init(void)
{
return i2c_add_driver(&max732x_driver);
}
module_init(max732x_init);
/* register after i2c postcore initcall and before
* subsys initcalls that may rely on these GPIOs
*/
subsys_initcall(max732x_init);
static void __exit max732x_exit(void)
{

5
drivers/gpio/pca953x.c
View File

@ -289,7 +289,10 @@ static int __init pca953x_init(void)
{
return i2c_add_driver(&pca953x_driver);
}
module_init(pca953x_init);
/* register after i2c postcore initcall and before
* subsys initcalls that may rely on these GPIOs
*/
subsys_initcall(pca953x_init);
static void __exit pca953x_exit(void)
{

5
drivers/gpio/pcf857x.c
View File

@ -351,7 +351,10 @@ static int __init pcf857x_init(void)
{
return i2c_add_driver(&pcf857x_driver);
}
module_init(pcf857x_init);
/* register after i2c postcore initcall and before
* subsys initcalls that may rely on these GPIOs
*/
subsys_initcall(pcf857x_init);
static void __exit pcf857x_exit(void)
{