On Wed, Feb 12, 2014 at 4:49 AM, David Daney <ddaney.cavm@xxxxxxxxx> wrote: > From: David Daney <david.daney@xxxxxxxxxx> > > When we have a GPIO pin connected to an open-drain network, we want a > standard way of specifying this in the device tree. So we choose bit > 1 of the flag field to indicate open drain. > > A typical use case would be something like: > > enum of_gpio_flags f; > . > . > . > reset_gpio = of_get_named_gpio_flags(node, "reset", 0, &f); > . > . > . > ret = gpio_request_one(reset_gpio, > (f & OF_GPIO_OPEN_DRAIN) ? GPIOF_OPEN_DRAIN : 0, > "reset"); > . > . > . > gpio_direction_output(reset_gpio, 1); > gpio_set_value(reset_gpio, 0); > msleep(20); > gpio_set_value(reset_gpio, 1); > . > . > . > > Since the same arguments hold for open-source configurations, add a > definition for OF_GPIO_OPEN_SOURCE as well. > > Signed-off-by: David Daney <david.daney@xxxxxxxxxx> Reviewed-by: Alexandre Courbot <acourbot@xxxxxxxxxx> -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
