On 1/12/2015 11:57 PM, Linus Walleij wrote: > On Sat, Dec 6, 2014 at 1:40 AM, Ray Jui <rjui@xxxxxxxxxxxx> wrote: > >> Document the GPIO device tree binding for Broadcom Cygnus SoC >> >> Signed-off-by: Ray Jui <rjui@xxxxxxxxxxxx> >> Reviewed-by: Scott Branden <sbranden@xxxxxxxxxxxx> > (...) >> +- #gpio-cells: >> + Must be two. The first cell is the GPIO pin number (within the >> +controller's domain) and the second cell is used for the following: >> + bit[0]: polarity (0 for normal and 1 for inverted) >> + bit[18:16]: internal pull up/down: 0 - pull up/down disabled >> + 1 - pull up enabled >> + 2 - pull down enabled >> + bit[22:20]: drive strength: 0 - 2 mA >> + 1 - 4 mA >> + 2 - 6 mA >> + 3 - 8 mA >> + 4 - 10 mA >> + 5 - 12 mA >> + 6 - 14 mA >> + 7 - 16 mA > > No. This pull up/down and drive strength is pin controller > business, use a pin control backend behind the GPIO driver > see Documentation/pinctrl.txt. > > Initial states for these configurations can be set up using > pin control hogs since pin control and GPIO is orthogonal. > Yes, I got it! See my reply in the GPIO driver review. Thanks. > Yours, > Linus Walleij > -- 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
