linux-kernel - Re: [RFC PATCH v2 1/6] dt-bindings: ROHM BD96801 PMIC regulators

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Date: Sat, 13 Apr 2024 23:27:46 +0200
From: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To: Matti Vaittinen <mazziesaccount@...il.com>,
 Matti Vaittinen <matti.vaittinen@...rohmeurope.com>
Cc: Lee Jones <lee@...nel.org>, Rob Herring <robh@...nel.org>,
 Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
 Conor Dooley <conor+dt@...nel.org>, Liam Girdwood <lgirdwood@...il.com>,
 Mark Brown <broonie@...nel.org>, Wim Van Sebroeck <wim@...ux-watchdog.org>,
 Guenter Roeck <linux@...ck-us.net>, devicetree@...r.kernel.org,
 linux-kernel@...r.kernel.org, linux-watchdog@...r.kernel.org
Subject: Re: [RFC PATCH v2 1/6] dt-bindings: ROHM BD96801 PMIC regulators

On 12/04/2024 13:21, Matti Vaittinen wrote:
> ROHM BD96801 is a highly configurable automotive grade PMIC. Introduce
> DT bindings for the BD96801 regulators.
> 
> Signed-off-by: Matti Vaittinen <mazziesaccount@...il.com>
> ---
> Revision history:
> - No changes since RFCv1

Subject: missing "regulator" prefix, as first.

> 
>  .../regulator/rohm,bd96801-regulator.yaml     | 69 +++++++++++++++++++
>  1 file changed, 69 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/regulator/rohm,bd96801-regulator.yaml
> 
> diff --git a/Documentation/devicetree/bindings/regulator/rohm,bd96801-regulator.yaml b/Documentation/devicetree/bindings/regulator/rohm,bd96801-regulator.yaml
> new file mode 100644
> index 000000000000..4015802a3d84
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/regulator/rohm,bd96801-regulator.yaml
> @@ -0,0 +1,69 @@
> +# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/regulator/rohm,bd96801-regulator.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: ROHM BD96801 Power Management Integrated Circuit regulators
> +
> +maintainers:
> +  - Matti Vaittinen <matti.vaittinen@...rohmeurope.com>
> +
> +description: |
> +  This module is part of the ROHM BD96801 MFD device. For more details
> +  see Documentation/devicetree/bindings/mfd/rohm,bd96801-pmic.yaml.
> +
> +  The regulator controller is represented as a sub-node of the PMIC node
> +  on the device tree.
> +
> +  Regulator nodes should be named to BUCK_<number> and LDO_<number>.
> +  The valid names for BD96801 regulator nodes are
> +  BUCK1, BUCK2, BUCK3, BUCK4, LDO5, LDO6, LDO7
> +
> +patternProperties:
> +  "^LDO[5-7]$":

lowercase

> +    type: object
> +    description:
> +      Properties for single LDO regulator.
> +    $ref: regulator.yaml#

Missing unevaluatedProperties: false

> +
> +    properties:
> +      regulator-name:
> +        pattern: "^ldo[5-7]$"
> +        description:
> +          Name of the regulator. Should be "ldo5", ..., "ldo7"

Why do you enforce the name? The name should match board schematics, not
regulator datasheet.

> +      rohm,initial-voltage-microvolt:
> +        description:
> +          Initial voltage for regulator. Voltage can be tuned +/-150 mV from
> +          this value. NOTE, This can be modified via I2C only when PMIC is in
> +          STBY state.
> +        minimum: 300000
> +        maximum: 3300000

Hm, regulator min/max microvolts properties don't work for you? The
initial will be just middle?

> +
> +  "^BUCK[1-4]$":

lowercase

> +    type: object
> +    description:
> +      Properties for single BUCK regulator.
> +    $ref: regulator.yaml#
> +
> +    properties:
> +      regulator-name:
> +        pattern: "^buck[1-4]$"
> +        description:
> +          should be "buck1", ..., "buck4"
> +      rohm,initial-voltage-microvolt:
> +        description:
> +          Initial voltage for regulator. Voltage can be tuned +/-150 mV from
> +          this value. NOTE, This can be modified via I2C only when PMIC is in
> +          STBY state.
> +        minimum: 500000
> +        maximum: 3300000

Missing blank line

> +      rohm,keep-on-stby:
> +        description:
> +          Keep the regulator powered when PMIC transitions to STBY state.
> +        type: boolean
> +
> +    required:
> +      - regulator-name
> +  additionalProperties: false

Blank line

> +additionalProperties: false

Best regards,
Krzysztof