GitHub-Mirror/u-boot
2
0
Fork 0
mirror of https://github.com/Fishwaldo/u-boot.git synced 2025-03-22 07:01:39 +00:00
Code Issues Projects Releases Packages Wiki Activity Actions

mxc: Make gpio_get_value() use PSR

Browse source 
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>
This commit is contained in:
Benoît Thébaudeau 2012-08-20 10:55:41 +00:00 • committed by Albert ARIBAUD
parent 5c8d14dfd9
commit 5dafa4543c
1 changed files with 1 additions and 1 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

2
drivers/gpio/mxc_gpio.c
View file

@ -116,7 +116,7 @@ int gpio_get_value(unsigned gpio)
regs = (struct gpio_regs *)gpio_ports[port]; regs = (struct gpio_regs *)gpio_ports[port];
val = (readl(&regs->gpio_dr) >> gpio) & 0x01; val = (readl(&regs->gpio_psr) >> gpio) & 0x01;
return val; return val;
} }