Am Montag, 15. August 2022, 06:34:32 CEST schrieb Samuel Holland: > The Allwinner D1 SoC contains two pairs of in-package LDOs. One pair is > for general purpose use. LDOA generally powers the board's 1.8 V rail. > LDOB generally powers the in-package DRAM, where applicable. > > The other pair of LDOs powers the analog power domains inside the SoC, > including the audio codec, thermal sensor, and ADCs. These LDOs require > a 0.9 V bandgap voltage reference. The calibration value for the voltage > reference is stored in an eFuse, accessed via an NVMEM cell. > > Neither LDO control register is in its own MMIO range; instead, each > regulator device relies on a regmap/syscon exported by its parent. > > Signed-off-by: Samuel Holland <samuel@xxxxxxxxxxxx> > --- > > Changes in v3: > - Add "reg" property to bindings > - Add "unevaluatedProperties: true" to regulator nodes > - Minor changes to regulator node name patterns > - Remove system-ldos example (now added in patch 3) > > Changes in v2: > - Remove syscon property from bindings > - Update binding examples to fix warnings and provide context > > .../allwinner,sun20i-d1-analog-ldos.yaml | 74 +++++++++++++++++++ > .../allwinner,sun20i-d1-system-ldos.yaml | 37 ++++++++++ > 2 files changed, 111 insertions(+) > create mode 100644 Documentation/devicetree/bindings/regulator/allwinner,sun20i-d1-analog-ldos.yaml > create mode 100644 Documentation/devicetree/bindings/regulator/allwinner,sun20i-d1-system-ldos.yaml > > diff --git a/Documentation/devicetree/bindings/regulator/allwinner,sun20i-d1-analog-ldos.yaml b/Documentation/devicetree/bindings/regulator/allwinner,sun20i-d1-analog-ldos.yaml > new file mode 100644 > index 000000000000..d6964b44ef21 > --- /dev/null > +++ b/Documentation/devicetree/bindings/regulator/allwinner,sun20i-d1-analog-ldos.yaml > @@ -0,0 +1,74 @@ > +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) > +%YAML 1.2 > +--- > +$id: http://devicetree.org/schemas/regulator/allwinner,sun20i-d1-analog-ldos.yaml# > +$schema: http://devicetree.org/meta-schemas/core.yaml# > + > +title: Allwinner D1 Analog LDOs > + > +description: > + Allwinner D1 contains a set of LDOs which are designed to supply analog power > + inside and outside the SoC. They are controlled by a register within the audio > + codec MMIO space, but which is not part of the audio codec clock/reset domain. > + > +maintainers: > + - Samuel Holland <samuel@xxxxxxxxxxxx> > + > +properties: > + compatible: > + enum: > + - allwinner,sun20i-d1-analog-ldos > + > + reg: > + maxItems: 1 > + > + nvmem-cells: > + items: > + - description: NVMEM cell for the calibrated bandgap reference trim value > + > + nvmem-cell-names: > + items: > + - const: bg_trim aren't dashes "-" preferred over underscores "_" in string names? Maybe even make this "bandgap-trim" for a bit more explanatory naming? Heiko
