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-rw-r--r--arch/arm/mach-at91rm9200/devices.c4
-rw-r--r--arch/arm/mach-at91rm9200/gpio.c17
-rw-r--r--include/asm-arm/arch-at91rm9200/gpio.h1
3 files changed, 21 insertions, 1 deletions
diff --git a/arch/arm/mach-at91rm9200/devices.c b/arch/arm/mach-at91rm9200/devices.c
index 8df3e524565..57eedd5beaf 100644
--- a/arch/arm/mach-at91rm9200/devices.c
+++ b/arch/arm/mach-at91rm9200/devices.c
@@ -100,8 +100,10 @@ void __init at91_add_device_udc(struct at91_udc_data *data)
at91_set_gpio_input(data->vbus_pin, 0);
at91_set_deglitch(data->vbus_pin, 1);
}
- if (data->pullup_pin)
+ if (data->pullup_pin) {
at91_set_gpio_output(data->pullup_pin, 0);
+ at91_set_multi_drive(data->pullup_pin, 1);
+ }
udc_data = *data;
platform_device_register(&at91rm9200_udc_device);
diff --git a/arch/arm/mach-at91rm9200/gpio.c b/arch/arm/mach-at91rm9200/gpio.c
index 2fd2ef583e4..a9f718bf8ba 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);
+
/*--------------------------------------------------------------------------*/
diff --git a/include/asm-arm/arch-at91rm9200/gpio.h b/include/asm-arm/arch-at91rm9200/gpio.h
index 0f0a61e2f12..6176ab2dc41 100644
--- a/include/asm-arm/arch-at91rm9200/gpio.h
+++ b/include/asm-arm/arch-at91rm9200/gpio.h
@@ -183,6 +183,7 @@ extern int at91_set_B_periph(unsigned pin, int use_pullup);
extern int at91_set_gpio_input(unsigned pin, int use_pullup);
extern int at91_set_gpio_output(unsigned pin, int value);
extern int at91_set_deglitch(unsigned pin, int is_on);
+extern int at91_set_multi_drive(unsigned pin, int is_on);
/* callable at any time */
extern int at91_set_gpio_value(unsigned pin, int value);