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 + +patternProperties: + "^(a|hp)ldo$": + type: object + $ref: regulator.yaml# + unevaluatedProperties: false + +required: + - compatible + - reg + - nvmem-cells + - nvmem-cell-names + +unevaluatedProperties: false + +examples: + - | + audio-codec@2030000 { + compatible = "simple-mfd", "syscon"; + reg = <0x2030000 0x1000>; + ranges; + #address-cells = <1>; + #size-cells = <1>; + + regulators@2030348 { + compatible = "allwinner,sun20i-d1-analog-ldos"; + reg = <0x2030348 0x4>; + nvmem-cells = <&bg_trim>; + nvmem-cell-names = "bg_trim"; + + reg_aldo: aldo { + regulator-min-microvolt = <1800000>; + regulator-max-microvolt = <1800000>; + }; + + reg_hpldo: hpldo { + regulator-min-microvolt = <1800000>; + regulator-max-microvolt = <1800000>; + }; + }; + }; + +... diff --git a/Documentation/devicetree/bindings/regulator/allwinner,sun20i-d1-system-ldos.yaml b/Documentation/devicetree/bindings/regulator/allwinner,sun20i-d1-system-ldos.yaml new file mode 100644 index 000000000000..e3e2810fb3d7 --- /dev/null +++ b/Documentation/devicetree/bindings/regulator/allwinner,sun20i-d1-system-ldos.yaml @@ -0,0 +1,37 @@ +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/regulator/allwinner,sun20i-d1-system-ldos.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: Allwinner D1 System LDOs + +description: + Allwinner D1 contains a pair of general-purpose LDOs which are designed to + supply power inside and outside the SoC. They are controlled by a register + within the system control MMIO space. + +maintainers: + - Samuel Holland <samuel@xxxxxxxxxxxx> + +properties: + compatible: + enum: + - allwinner,sun20i-d1-system-ldos + + reg: + maxItems: 1 + +patternProperties: + "^ldo[ab]$": + type: object + $ref: regulator.yaml# + unevaluatedProperties: false + +required: + - compatible + - reg + +unevaluatedProperties: false + +... -- 2.35.1
