commit 5dafa4543c399d329c7b01df1afa98437861cac0
author Benoît Thébaudeau <benoit.thebaudeau@advansee.com> Mon Aug 20 10:55:41 2012 +0000
committer Albert ARIBAUD <albert.u.boot@aribaud.net> Sat Sep 01 14:58:28 2012 +0200
tree 2c33860a28c4d7c492e1f15e0aa8dd9a13d3e482
parent 5c8d14dfd978eb787307298110a32329e989e6ab

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>

drivers/gpio/mxc_gpio.c

diff --git a/drivers/gpio/mxc_gpio.c b/drivers/gpio/mxc_gpio.c
index 6615535..e9bf278 100644
--- a/drivers/gpio/mxc_gpio.c
+++ b/drivers/gpio/mxc_gpio.c
@@ -116,7 +116,7 @@
 
 	regs = (struct gpio_regs *)gpio_ports[port];
 
-	val = (readl(&regs->gpio_dr) >> gpio) & 0x01;
+	val = (readl(&regs->gpio_psr) >> gpio) & 0x01;
 
 	return val;
 }