The patch titled
gpio: i2c expanders use subsys_init
has been added to the -mm tree. Its filename is
gpio-i2c-expanders-use-subsys_init.patch
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------------------------------------------------------
Subject: gpio: i2c expanders use subsys_init
From: David Brownell <dbrownell@xxxxxxxxxxxxxxxxxxxxx>
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@xxxxxxxxxxxxxxxxxxxxx>
Cc: Jean Delvare <khali@xxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
drivers/gpio/max732x.c | 5 ++++-
drivers/gpio/pca953x.c | 5 ++++-
drivers/gpio/pcf857x.c | 5 ++++-
3 files changed, 12 insertions(+), 3 deletions(-)
diff -puN drivers/gpio/max732x.c~gpio-i2c-expanders-use-subsys_init drivers/gpio/max732x.c
--- a/drivers/gpio/max732x.c~gpio-i2c-expanders-use-subsys_init
+++ a/drivers/gpio/max732x.c
@@ -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)
{
diff -puN drivers/gpio/pca953x.c~gpio-i2c-expanders-use-subsys_init drivers/gpio/pca953x.c
--- a/drivers/gpio/pca953x.c~gpio-i2c-expanders-use-subsys_init
+++ a/drivers/gpio/pca953x.c
@@ -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)
{
diff -puN drivers/gpio/pcf857x.c~gpio-i2c-expanders-use-subsys_init drivers/gpio/pcf857x.c
--- a/drivers/gpio/pcf857x.c~gpio-i2c-expanders-use-subsys_init
+++ a/drivers/gpio/pcf857x.c
@@ -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)
{
_
Patches currently in -mm which might be from dbrownell@xxxxxxxxxxxxxxxxxxxxx are
rtc-fix-kernel-panic-on-second-use-of-sigio-nofitication.patch
orion_spi-fix-handling-of-default-transfer-speed.patch
git-arm.patch
git-avr32.patch
git-x86.patch
git-mtd.patch
acpi-cope-with-pnpacpi-tables-missing-an-rtc-entry.patch
spi-simplify-spi_write_then_read.patch
spi_s3c24xx-pin-configuration-updates.patch
pxa2xx_spi-minor-cleanup.patch
pxa2xx_spi-fix-chip_info-defaults-and-documentation.patch
orion_spi-handle-88f6183-erratum.patch
rtc-ds1307-alarm-support-for-ds1337-ds1339.patch
rtc-remove-some-nop-open-release-methods.patch
legacy-rtc-remove-needless-confusing-hpet_rtc_irq-option.patch
rtc-file-close-consistently-disables-repeating-irqs.patch
rtc-cmos-strongly-avoid-hpet-emulation.patch
rtc-cmos-export-second-nvram-bank.patch
make-gpiochip-label-const.patch
gpio-i2c-expanders-use-subsys_init.patch
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