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Message-ID: <20220801172750.GA1198151-robh@kernel.org>
Date: Mon, 1 Aug 2022 11:27:50 -0600
From: Rob Herring <robh@...nel.org>
To: Samuel Holland <samuel@...lland.org>
Cc: Liam Girdwood <lgirdwood@...il.com>,
Mark Brown <broonie@...nel.org>, Chen-Yu Tsai <wens@...e.org>,
Jernej Skrabec <jernej.skrabec@...il.com>,
Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
linux-kernel@...r.kernel.org, linux-sunxi@...ts.linux.dev
Subject: Re: [PATCH 1/2] regulator: dt-bindings: Add Allwinner D1 LDOs
On Sun, Jul 31, 2022 at 11:47:57PM -0500, Samuel Holland wrote:
> 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@...lland.org>
> ---
>
> .../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@...lland.org>
> +
> +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:
'syscon' is not a generic property. Name it based on the block you are
linking to or what the control is.
Or better yet, if this is the only control interface, make this a child
node of the referenced node instead.
> + $ref: /schemas/types.yaml#/definitions/phandle
> + description: phandle of the device containing the power register
> +
> +patternProperties:
> + "^(aldo|hpldo)$":
> + type: object
> + $ref: regulator.yaml#
unevaluatedProperties: false
> +
> +required:
> + - compatible
> + - nvmem-cells
> + - nvmem-cell-names
> + - syscon
> +
> +unevaluatedProperties: false
> +
> +examples:
> + - |
> + sid: efuse {
> + #address-cells = <1>;
> + #size-cells = <1>;
> +
> + bg_trim: bg-trim@28 {
> + reg = <0x28 0x4>;
> + bits = <16, 8>;
> + };
> + };
> +
> + ldos-analog {
> + compatible = "allwinner,sun20i-d1-analog-ldos";
> + nvmem-cells = <&bg_trim>;
> + nvmem-cell-names = "bg_trim";
> + syscon = <&codec>;
> +
> + reg_aldo: aldo {
> + regulator-min-microvolt = <1800000>;
> + regulator-max-microvolt = <1800000>;
> + };
> +
> + reg_hpldo: hpldo {
> + regulator-min-microvolt = <1800000>;
> + regulator-max-microvolt = <1800000>;
> + };
> + };
> +
> +...
> diff --git a/Documentation/devicetree/bindings/regulator/allwinner,sun20i-d1-system-ldos.yaml b/Documentation/devicetree/bindings/regulator/allwinner,sun20i-d1-system-ldos.yaml
> new file mode 100644
> index 000000000000..13b2e8c84f1d
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/regulator/allwinner,sun20i-d1-system-ldos.yaml
> @@ -0,0 +1,55 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$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@...lland.org>
> +
> +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
>
>
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