diff options
Diffstat (limited to 'arch/arm/mach-at91rm9200/gpio.c')
| -rw-r--r-- | arch/arm/mach-at91rm9200/gpio.c | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/arch/arm/mach-at91rm9200/gpio.c b/arch/arm/mach-at91rm9200/gpio.c index 2fd2ef583e4d4f..a9f718bf8ba873 100644 --- a/arch/arm/mach-at91rm9200/gpio.c +++ b/arch/arm/mach-at91rm9200/gpio.c @@ -159,6 +159,23 @@ int __init_or_module at91_set_deglitch(unsigned pin, int is_on) } EXPORT_SYMBOL(at91_set_deglitch); +/* + * enable/disable the multi-driver; This is only valid for output and + * allows the output pin to run as an open collector output. + */ +int __init_or_module at91_set_multi_drive(unsigned pin, int is_on) +{ + void __iomem *pio = pin_to_controller(pin); + unsigned mask = pin_to_mask(pin); + + if (!pio) + return -EINVAL; + + __raw_writel(mask, pio + (is_on ? PIO_MDER : PIO_MDDR)); + return 0; +} +EXPORT_SYMBOL(at91_set_multi_drive); + /*--------------------------------------------------------------------------*/ |