mxc: Make gpio_get_value() use PSR

gpio_get_value() should use PSR like Linux, not DR, because DR does not always
reflect the pin state, while PSR does. This is especially useful to detect a
short circuit on a GPIO pin configured as output, or to read the level of a pin
controlled by a non-GPIO IOMUX function.

Signed-off-by: Benoît Thébaudeau <benoit.thebaudeau@advansee.com>
Cc: Stefano Babic <sbabic@denx.de>
Acked-by: Stefano Babic <sbabic@denx.de>

diff --git a/drivers/gpio/mxc_gpio.c b/drivers/gpio/mxc_gpio.c
index 661553552e6875d40cad956a82bcef9ac7057b57..e9bf27841cdbabdf7719050b5929bf7f35e027f2 100644 (file)
--- a/drivers/gpio/mxc_gpio.c
+++ b/drivers/gpio/mxc_gpio.c
@@ -116,7 +116,7 @@ int gpio_get_value(unsigned gpio)
 
        regs = (struct gpio_regs *)gpio_ports[port];
 
-       val = (readl(&regs->gpio_dr) >> gpio) & 0x01;
+       val = (readl(&regs->gpio_psr) >> gpio) & 0x01;
 
        return val;
 }