пн, 16 сент. 2024 г. в 12:14, Krzysztof Kozlowski <krzk@xxxxxxxxxx>: > > On Fri, Sep 13, 2024 at 06:07:49PM +0300, Dzmitry Sankouski wrote: > > Add samsung,s2dos05 MFD module binding. > > > > Signed-off-by: Dzmitry Sankouski <dsankouski@xxxxxxxxx> > > > > --- > > Changes in v4: > > - split long(>80) lines > > - fix indentation > > - merge with regulators binding > > - drop pmic suffix > > - drop unused labels in example > > - correct description > > --- > > .../devicetree/bindings/mfd/samsung,s2dos05.yaml | 99 ++++++++++++++++++++++ > > MAINTAINERS | 1 + > > 2 files changed, 100 insertions(+) > > > > diff --git a/Documentation/devicetree/bindings/mfd/samsung,s2dos05.yaml b/Documentation/devicetree/bindings/mfd/samsung,s2dos05.yaml > > new file mode 100644 > > index 000000000000..534434002045 > > --- /dev/null > > +++ b/Documentation/devicetree/bindings/mfd/samsung,s2dos05.yaml > > @@ -0,0 +1,99 @@ > > +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause) > > +%YAML 1.2 > > +--- > > +$id: http://devicetree.org/schemas/mfd/samsung,s2dos05.yaml# > > +$schema: http://devicetree.org/meta-schemas/core.yaml# > > + > > +title: Samsung S2DOS05 Power Management IC > > + > > +maintainers: > > + - Dzmitry Sankouski <dsankouski@xxxxxxxxx> > > + > > +description: > > + This is a device tree bindings for S2DOS family of Power Management IC (PMIC). > > Drop this sentence, not really useful. I know that I put it into other > Samsung PMIC bindings, but let's don't grow this pattern. > > > + > > + The S2DOS05 is a companion power management IC for the panel and touchscreen > > + in smart phones. Provides voltage regulators and > > + ADC for power/current measurements. > > + > > + Regulator section has 4 LDO and 1 BUCK regulators and also > > + provides ELVDD, ELVSS, AVDD lines. > > What are these? Input supplies? > ELVSS and ELVDD are common abbreviations for AMOLED panel backlight supplies, AVDD for panel electronics. I conclude that s2dos05 ic provides ELVSS, ELVDD, AVDD from the facts, it can measure its current and power. Those power lines are controlled by display hardware [1], i.e. vendor kernel driver has no clue how to control those regulators. I guess they just combined regular regulator ic with ELVSS, ELVDD, AVDD ic like [2]. [1]: https://github.com/klabit87/twrp_android_samsung_kernel_sdm845/blob/android-8.0/drivers/gpu/drm/msm/samsung/S6E3HA8_AMB577PX01/dsi_panel_S6E3HA8_AMB577PX01_wqhd_octa_cmd.dtsi#L3508 [2]: https://www.st.com/resource/en/data_brief/stmp30.pdf
