On Tue, May 7, 2019 at 1:57 PM Guillaume La Roque <glaroque@xxxxxxxxxxxx> wrote: > > The purpose of this patchset is to add drive-strength support in meson pinconf > driver. This is a new feature that was added on the g12a. It is critical for us > to support this since many functions are failing with default pad drive-strength. > > The value achievable by the SoC are 0.5mA, 2.5mA, 3mA and 4mA and the DT property > 'drive-strength' is expressed in mA. > So this patch add another generic property "drive-strength-uA". The change to do so > would be minimal and could be benefit to other platforms later on. > > Cheers > Guillaume > > Changes since v2: > - update driver-strength-uA property to be compliant with DT documentation > - rework patch series for better understanding > - rework set_bias function > > Changes since v1: > - fix missing break > - implement new pinctrl generic property "drive-strength-uA" > > [1] https://lkml.kernel.org/r/20190314163725.7918-1-jbrunet@xxxxxxxxxxxx > > > Guillaume La Roque (6): > dt-bindings: pinctrl: add a 'drive-strength-microamp' property > pinctrl: generic: add new 'drive-strength-microamp' property support > dt-bindings: pinctrl: meson: Add drive-strength-microamp property > pinctrl: meson: Rework enable/disable bias part > pinctrl: meson: add support of drive-strength-microamp > pinctrl: meson: g12a: add DS bank value > > .../bindings/pinctrl/meson,pinctrl.txt | 4 + > .../bindings/pinctrl/pinctrl-bindings.txt | 3 + > drivers/pinctrl/meson/pinctrl-meson-g12a.c | 36 ++-- > drivers/pinctrl/meson/pinctrl-meson.c | 177 +++++++++++++++--- > drivers/pinctrl/meson/pinctrl-meson.h | 18 +- > drivers/pinctrl/pinconf-generic.c | 2 + > include/linux/pinctrl/pinconf-generic.h | 3 + > 7 files changed, 195 insertions(+), 48 deletions(-) I gave this a go on one of my Meson8m2 boards: [Meson8m2 doesn't support drive strength and still boots without any crashes or obvious regressions] Tested-by: Martin Blumenstingl <martin.blumenstingl@xxxxxxxxxxxxxx>
