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SubjectRe: [PATCH v2] pinctrl: at91-pio4: add support for drive strength
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.desroches@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 <robh@kernel.org>

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