linux-kernel - Re: [PATCH v3 2/4] dt-bindings: regulator: add document bindings for mpq7920

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Date:   Mon, 23 Dec 2019 11:50:28 +0100
From:   Maxime Ripard <mripard@...nel.org>
To:     Saravanan Sekar <sravanhome@...il.com>
Cc:     lgirdwood@...il.com, broonie@...nel.org, robh+dt@...nel.org,
        mark.rutland@....com, shawnguo@...nel.org, heiko@...ech.de,
        sam@...nborg.org, icenowy@...c.io,
        laurent.pinchart@...asonboard.com, gregkh@...uxfoundation.org,
        Jonathan.Cameron@...wei.com, davem@...emloft.net,
        mchehab+samsung@...nel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 2/4] dt-bindings: regulator: add document bindings for
 mpq7920

On Sun, Dec 22, 2019 at 09:45:05PM +0100, Saravanan Sekar wrote:
> Add device tree binding information for mpq7920 regulator driver.
> Example bindings for mpq7920 are added.
>
> Signed-off-by: Saravanan Sekar <sravanhome@...il.com>
> ---
>  .../bindings/regulator/mpq7920.yaml           | 143 ++++++++++++++++++
>  1 file changed, 143 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/regulator/mpq7920.yaml
>
> diff --git a/Documentation/devicetree/bindings/regulator/mpq7920.yaml b/Documentation/devicetree/bindings/regulator/mpq7920.yaml
> new file mode 100644
> index 000000000000..d173ba1fb28d
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/regulator/mpq7920.yaml
> @@ -0,0 +1,143 @@
> +# SPDX-License-Identifier: GPL-2.0
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/regulator/mpq7920.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Monolithic Power System MPQ7920 PMIC
> +
> +maintainers:
> +  - Saravanan Sekar <sravanhome@...il.com>
> +
> +properties:
> +  $nodename:
> +    pattern: "pmic@[0-9a-f]{1,2}"
> +  compatible:
> +    enum:
> +      - mps,mpq7920
> +
> +  reg:
> +    maxItems: 1
> +
> +  mps,time-slot:
> +    description:
> +      each regulator output shall be delayed during power on/off sequence which
> +      based on configurable time slot value, must be one of following corresponding
> +      value 0.5ms, 2ms, 8ms, 16ms
> +    allOf:
> +      - $ref: "/schemas/types.yaml#/definitions/uint8"
> +      - enum: [ 0, 1, 2, 3 ]
> +      - default: 0
> +
> +  mps,fixed-on-time:
> +     description:
> +       select power on sequence with fixed time output delay mentioned in
> +       time-slot reg for all the regulators.
> +     type: boolean
> +
> +  mps,fixed-off-time:
> +     description:
> +        select power off sequence with fixed time output delay mentioned in
> +        time-slot reg for all the regulators.
> +     type: boolean

I'm not sure what this fixed-on-time and fixed-off-time property is
supposed to be doing. Why not just get rid of the time slot property,
and set the power on / power off time in fixed-on-time /
fixed-off-time property?

> +  mps,inc-off-time:
> +     description: |
> +        mutually exclusive to mps,fixed-off-time an array of 8, linearly increase
> +        output delay during power off sequence based on factor of time slot/interval
> +        for each regulator.
> +     allOf:
> +       - $ref: "/schemas/types.yaml#/definitions/uint8-array"
> +       - minimum: 0
> +       - maximum: 15
> +       - default: [ 0, 6, 0, 6, 7, 7, 7, 9 ]

You should check the size of the array too, but if it's a property of
the regulators, why not have it in the regulators node?

> +  mps,inc-on-time:
> +     description: |
> +        mutually exclusive to mps,fixed-on-time an array of 8, linearly increase
> +        output delay during power on sequence based on factor of time slot/interval
> +        for each regulator.
> +     allOf:
> +       - $ref: "/schemas/types.yaml#/definitions/uint8-array"
> +       - minimum: 0
> +       - maximum: 15
> +       - default: [ 0, 6, 0, 6, 7, 7, 7, 9 ]
> +
> +  mps,switch-freq:
> +     description: |
> +        switching frequency must be one of following corresponding value
> +        1.1MHz, 1.65MHz, 2.2MHz, 2.75MHz
> +     allOf:
> +       - $ref: "/schemas/types.yaml#/definitions/uint8"
> +       - enum: [ 0, 1, 2, 3 ]
> +       - default: 2
> +
> +  mps,buck-softstart:
> +     description: |
> +        An array of 4 contains soft start time of each buck, must be one of
> +        following corresponding values 150us, 300us, 610us, 920us
> +     allOf:
> +       - $ref: "/schemas/types.yaml#/definitions/uint8-array"
> +       - enum: [ 0, 1, 2, 3 ]
> +       - default: [ 1, 1, 1, 1 ]
> +
> +  mps,buck-ovp:
> +     description: |
> +        An array of 4 contains over voltage protection of each buck, must be
> +        one of above values
> +     allOf:
> +       - $ref: "/schemas/types.yaml#/definitions/uint8-array"
> +       - enum: [ 0, 1 ]
> +       - default: [ 1, 1, 1, 1 ]
> +
> +  mps,buck-phase-delay:
> +     description: |
> +        An array of 4 contains phase delay of each buck must be one of above values
> +        corresponding to 0deg, 90deg, 180deg, 270deg
> +     allOf:
> +       - $ref: "/schemas/types.yaml#/definitions/uint8-array"
> +       - enum: [ 0, 1, 2, 3 ]
> +       - default: [ 0, 0, 1, 1 ]
> +
> +  regulators:
> +    type: object
> +    description:
> +      list of regulators provided by this controller, must be named
> +      after their hardware counterparts BUCK[1-4], one LDORTC, and LDO[2-5]
> +      The valid names for regulators are
> +      buck1, buck2, buck3, buck4, ldortc, ldo2, ldo3, ldo4, ldo5

For the third times now, the names should be validated using
propertyNames.

Maxime
>

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