linux-kernel - Re: [PATCH v3 1/4] regulator: dt-bindings: Add Allwinner D1 LDOs

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Date:   Tue, 16 Aug 2022 13:00:33 +0300
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Heiko Stübner <heiko@...ech.de>,
        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>,
        Rob Herring <robh+dt@...nel.org>,
        linux-arm-kernel@...ts.infradead.org
Cc:     Samuel Holland <samuel@...lland.org>,
        Maxime Ripard <mripard@...nel.org>, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-sunxi@...ts.linux.dev
Subject: Re: [PATCH v3 1/4] regulator: dt-bindings: Add Allwinner D1 LDOs

On 15/08/2022 18:32, Heiko Stübner wrote:
> 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@...lland.org>
>> ---
>>
>> 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@...lland.org>
>> +
>> +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?

In node names yes. In strings, I think there is no preference. At least
I am not aware of it.

Best regards,
Krzysztof