Hi Dirk, Am Montag, 3. August 2015, 08:34:06 schrieb Dirk Behme: > Add support for hardware which uses an I2C Serializer / Deserializer > (SerDes) to communicate with the zFroce touch driver. In this case the > SerDes will be configured as an interrupt controller and the zForce driver > will have no access to poll the GPIO line. > > To support this, we add two dedicated new GPIOs in the device tree: > reset-gpio and irq-gpio. With the irq-gpio being optional, then. > > To not break the existing device trees, the index based 'gpios' entries > are still supported, but marked as deprecated. > > With this, if the interrupt GPIO is available, either via the old or new > device tree style, the while loop will read and handle the packets as long > as the GPIO indicates that the interrupt is asserted (existing, unchanged > driver behavior). > > If the interrupt GPIO isn't available, i.e. not configured via the new > device tree style, we are falling back to one read per ISR invocation > (new behavior to support the SerDes). > > Note that the gpiod functions help to handle the optional GPIO: > devm_gpiod_get_index_optional() will return NULL in case the interrupt > GPIO isn't available. And gpiod_get_value_cansleep() does cover this, too, > by returning 0 in this case. > > Signed-off-by: Dirk Behme <dirk.behme@xxxxxxxxxxxx> looks nice now in v2, thanks :-) Reviewed-by: Heiko Stuebner <heiko.stuebner@xxxxxx> -- To unsubscribe from this list: send the line "unsubscribe linux-input" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
