On Fri, Jun 29, 2018 at 10:15:33AM +0200, Ludovic Desroches wrote: > Add support for the drive strength configuration. Usually, this value is > expressed in mA. Since the numeric value depends on VDDIOP voltage, a > value we can't retrieve at runtime, the controller uses low, medium and > high to define the drive strength. > > The PIO controller accepts two values for the low drive configuration: 0 > and 1. Most of the time, we don't care about the drive strength. So we > keep the default value which is 0. The drive strength is advertised > through the sysfs only when it has been explicitly set in the device > tree i.e. if its value is different from 0. > > Signed-off-by: Ludovic Desroches <ludovic.desroc...@microchip.com> > --- > > Changes: > - v2: use atmel,drive-strength property instead of drive-strengh one > since it is not expressend in mA and there is no way to retrieve this > value at runtime. > - v1: https://www.spinics.net/lists/linux-gpio/msg27789.html > > .../bindings/pinctrl/atmel,at91-pio4-pinctrl.txt | 3 ++ > drivers/pinctrl/pinctrl-at91-pio4.c | 42 > ++++++++++++++++++++++ > include/dt-bindings/pinctrl/at91.h | 4 +++ > 3 files changed, 49 insertions(+)
For the DT parts, Acked-by: Rob Herring <r...@kernel.org>
