On 03/14/2013 04:02 AM, Hector Palacios wrote: > Hello, > > Maybe I'm missing something but the MXS processors (at least i.MX23 and > i.MX28) cannot set the polarity of the GPIOs, so shouldn't the > #gpio-cells be 1? > > (From Documentation/devicetree/bindings/gpio/fsl-imx-gpio.txt): > > - #gpio-cells : Should be two. The first cell is the pin number and > the second cell is used to specify the gpio polarity: > 0 = active high > 1 = active low
This field describes how software should interpret the GPIO values. So, if the GPIO is specified as active-high, then software will gpio_set_value(the_value_it_wants), whereas if the GPIO is specified as active-low, then software will gpio_set_value(!the_value_it_wants). Note that "software" here refers to the driver that requests/uses the GPIO, and the flags can be retrieve using of_get_gpio_flags(). _______________________________________________ devicetree-discuss mailing list [email protected] https://lists.ozlabs.org/listinfo/devicetree-discuss
