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....@ingics.com> Acked-by: Stefan Roese <s...@denx.de> Reviewed-by: Vipin Kumar <vipin.ku...@st.com> Reviewed-by: Michael Trimarchi <mich...@amarulasolutions.com> --- Hi, This patch was sent a couple months ago. http://patchwork.ozlabs.org/patch/273076/ Here is a resend with updating commit log. Regards, Axel drivers/gpio/spear_gpio.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) 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; } -- 1.8.1.2 _______________________________________________ U-Boot mailing list U-Boot@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot
