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| author | Axel Lin <axel.lin@ingics.com> | 2014-05-25 10:31:18 +0800 |
|---|---|---|
| committer | Albert ARIBAUD <albert.u.boot@aribaud.net> | 2014-07-04 21:37:29 +0200 |
| commit | c0c374024dbd38b1045784cb2880ba21db552c54 (patch) | |
| tree | 9eeec42e98b04eaa4c8b6d5620f5fcd46ab0eb1c /drivers/gpio/spear_gpio.c | |
| parent | fcfddfd50472d7ce84ef4e2853242bbeb7b37325 (diff) | |
| download | u-boot-imx-c0c374024dbd38b1045784cb2880ba21db552c54.zip u-boot-imx-c0c374024dbd38b1045784cb2880ba21db552c54.tar.gz u-boot-imx-c0c374024dbd38b1045784cb2880ba21db552c54.tar.bz2 | |
gpio: spear_gpio: Fix gpio_set_value() implementation
In current gpio_set_value() implementation, it always sets the gpio control bit
no matter the value argument is 0 or 1. Thus the GPIOs never set to low.
This patch fixes this bug.
The address bus is used as a mask on read/write operations, so that independent
software drivers can set their GPIO bits without affecting any other pins in a
single write operation. Thus we don't need a read-modify-write to update the
register.
Signed-off-by: Axel Lin <axel.lin@ingics.com>
Acked-by: Stefan Roese <sr@denx.de>
Reviewed-by: Vipin Kumar <vipin.kumar@st.com>
Reviewed-by: Michael Trimarchi <michael@amarulasolutions.com>
Diffstat (limited to 'drivers/gpio/spear_gpio.c')
| -rw-r--r-- | drivers/gpio/spear_gpio.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/drivers/gpio/spear_gpio.c b/drivers/gpio/spear_gpio.c index 367b670..6fb4117 100644 --- a/drivers/gpio/spear_gpio.c +++ b/drivers/gpio/spear_gpio.c @@ -36,7 +36,10 @@ int gpio_set_value(unsigned gpio, int value) { struct gpio_regs *regs = (struct gpio_regs *)CONFIG_GPIO_BASE; - writel(1 << gpio, ®s->gpiodata[DATA_REG_ADDR(gpio)]); + if (value) + writel(1 << gpio, ®s->gpiodata[DATA_REG_ADDR(gpio)]); + else + writel(0, ®s->gpiodata[DATA_REG_ADDR(gpio)]); return 0; } |