Blackfin arch: Add workaround to read edge triggered GPIOs

Signed-off-by: Michael Hennerich <michael.hennerich@analog.com>
Signed-off-by: Bryan Wu <cooloney@kernel.org>

1 files changed, 19 insertions, 0 deletions

diff --git a/arch/blackfin/kernel/bfin_gpio.c b/arch/blackfin/kernel/bfin_gpio.c
index 7e8eaf4a31bb..b6d89d1644cc 100644
--- a/arch/blackfin/kernel/bfin_gpio.c
+++ b/arch/blackfin/kernel/bfin_gpio.c
@@ -1130,6 +1130,25 @@ void bfin_gpio_irq_prepare(unsigned gpio)
 
 #else
 
+int gpio_get_value(unsigned gpio)
+{
+        unsigned long flags;
+        int ret;
+
+        if (unlikely(get_gpio_edge(gpio))) {
+                local_irq_save(flags);
+                set_gpio_edge(gpio, 0);
+                ret = get_gpio_data(gpio);
+                set_gpio_edge(gpio, 1);
+                local_irq_restore(flags);
+
+                return ret;
+        } else
+                return get_gpio_data(gpio);
+}
+EXPORT_SYMBOL(gpio_get_value);
+
+
 int gpio_direction_input(unsigned gpio)
 {
         unsigned long flags;