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authorBenoît Thébaudeau <benoit.thebaudeau@advansee.com>2012-08-20 10:55:41 +0000
committerAlbert ARIBAUD <albert.u.boot@aribaud.net>2012-09-01 14:58:28 +0200
commit5dafa4543c399d329c7b01df1afa98437861cac0 (patch)
tree2c33860a28c4d7c492e1f15e0aa8dd9a13d3e482 /drivers
parent5c8d14dfd978eb787307298110a32329e989e6ab (diff)
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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>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/gpio/mxc_gpio.c2
1 files changed, 1 insertions, 1 deletions
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 @@ 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;
}