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 syscon exported by some "host" device node. Getting the register via a syscon avoids a dependency on the subsystem/ driver for that host device (e.g. a functioning thermal sensor should not depend on having the audio codec driver loaded). Signed-off-by: Samuel Holland <samuel@xxxxxxxxxxxx> --- .../allwinner,sun20i-d1-analog-ldos.yaml | 77 +++++++++++++++++++ .../allwinner,sun20i-d1-system-ldos.yaml | 55 +++++++++++++ 2 files changed, 132 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..df648c56123d --- /dev/null +++ b/Documentation/devicetree/bindings/regulator/allwinner,sun20i-d1-analog-ldos.yaml @@ -0,0 +1,77 @@ +# 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, + and so is exposed as a syscon. + +maintainers: + - Samuel Holland <samuel@xxxxxxxxxxxx> + +properties: + compatible: + enum: + - allwinner,sun20i-d1-analog-ldos + + nvmem-cells: + items: + - description: NVMEM cell for the calibrated bandgap reference trim value + + nvmem-cell-names: + items: + - const: bg_trim + + syscon: + $ref: /schemas/types.yaml#/definitions/phandle + description: phandle of the device containing the power register + +patternProperties: + "^(aldo|hpldo)$": + type: object + $ref: regulator.yaml# + +required: + - compatible + - nvmem-cells + - nvmem-cell-names + - syscon + +unevaluatedProperties: false + +examples: + - | + sid: efuse { + #address-cells = <1>; + #size-cells = <1>; + + bg_trim: bg-trim@28 { + reg = <0x28 0x4>; + bits = <16, 8>; + }; + }; + + ldos-analog { + compatible = "allwinner,sun20i-d1-analog-ldos"; + nvmem-cells = <&bg_trim>; + nvmem-cell-names = "bg_trim"; + syscon = <&codec>; + + reg_aldo: aldo { + regulator-min-microvolt = <1800000>; + regulator-max-microvolt = <1800000>; + }; + + reg_hpldo: hpldo { + regulator-min-microvolt = <1800000>; + regulator-max-microvolt = <1800000>; + }; + }; + +... diff --git a/Documentation/devicetree/bindings/regulator/allwinner,sun20i-d1-system-ldos.yaml b/Documentation/devicetree/bindings/regulator/allwinner,sun20i-d1-system-ldos.yaml new file mode 100644 index 000000000000..13b2e8c84f1d --- /dev/null +++ b/Documentation/devicetree/bindings/regulator/allwinner,sun20i-d1-system-ldos.yaml @@ -0,0 +1,55 @@ +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) +%YAML 1.2 +--- +$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 controller MMIO space. + +maintainers: + - Samuel Holland <samuel@xxxxxxxxxxxx> + +properties: + compatible: + enum: + - allwinner,sun20i-d1-system-ldos + + syscon: + $ref: /schemas/types.yaml#/definitions/phandle + description: phandle of the device containing the LDO control register + +patternProperties: + "^(ldoa|ldob)$": + type: object + $ref: regulator.yaml# + +required: + - compatible + - syscon + +unevaluatedProperties: false + +examples: + - | + ldos-system { + compatible = "allwinner,sun20i-d1-system-ldos"; + syscon = <&syscon>; + + reg_ldoa: ldoa { + regulator-min-microvolt = <1800000>; + regulator-max-microvolt = <1800000>; + }; + + reg_ldob: ldob { + regulator-name = "vcc-dram"; + regulator-min-microvolt = <1500000>; + regulator-max-microvolt = <1500000>; + }; + }; + +... -- 2.35.1
