linux-kernel - Re: [PATCH v3 1/4] dt-bindings: mfd: Add TI TPS6594 PMIC

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Date:   Wed, 22 Mar 2023 08:34:32 +0100
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Julien Panis <jpanis@...libre.com>, lee@...nel.org,
        robh+dt@...nel.org, krzysztof.kozlowski+dt@...aro.org,
        corbet@....net, arnd@...db.de, gregkh@...uxfoundation.org,
        derek.kiernan@...inx.com, dragan.cvetic@...inx.com
Cc:     eric.auger@...hat.com, jgg@...pe.ca, razor@...ckwall.org,
        stephen@...workplumber.org, davem@...emloft.net,
        christian.koenig@....com, contact@...rsion.fr,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-doc@...r.kernel.org, sterzik@...com, u-kumar1@...com,
        eblanc@...libre.com, jneanne@...libre.com
Subject: Re: [PATCH v3 1/4] dt-bindings: mfd: Add TI TPS6594 PMIC

On 21/03/2023 18:10, Julien Panis wrote:
> TPS6594 is a Power Management IC which provides regulators and others
> features like GPIOs, RTC, watchdog, ESMs (Error Signal Monitor), and
> PFSM (Pre-configurable Finite State Machine) managing the state of the
> device.
> TPS6594 is the super-set device while TPS6593 and LP8764X are derivatives.
> 
> Signed-off-by: Julien Panis <jpanis@...libre.com>
> ---
>  .../devicetree/bindings/mfd/ti,tps6594.yaml   | 231 ++++++++++++++++++
>  1 file changed, 231 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/mfd/ti,tps6594.yaml
> 
> diff --git a/Documentation/devicetree/bindings/mfd/ti,tps6594.yaml b/Documentation/devicetree/bindings/mfd/ti,tps6594.yaml
> new file mode 100644
> index 000000000000..4e4565a68e40
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/mfd/ti,tps6594.yaml
> @@ -0,0 +1,231 @@
> +# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/mfd/ti,tps6594.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: TI TPS6594 Power Management Integrated Circuit
> +
> +maintainers:
> +  - Julien Panis <jpanis@...libre.com>
> +
> +description:
> +  TPS6594 is a Power Management IC which provides regulators and others
> +  features like GPIOs, RTC, watchdog, ESMs (Error Signal Monitor), and
> +  PFSM (Pre-configurable Finite State Machine) managing the state of the device.
> +  TPS6594 is the super-set device while TPS6593 and LP8764X are derivatives.
> +
> +properties:
> +  compatible:
> +    enum:
> +      - ti,lp8764x

Does x stand for a wildcard? If so, then fix it. Compatibles should be
specific.

> +      - ti,tps6593
> +      - ti,tps6594
> +
> +  reg:
> +    description: I2C slave address or SPI chip select number.
> +    maxItems: 1
> +
> +  ti,primary-pmic:
> +    type: boolean
> +    description: |
> +      Identify the primary PMIC on SPMI bus.
> +      A multi-PMIC synchronization scheme is implemented in the PMIC device
> +      to synchronize the power state changes with other PMIC devices. This is
> +      accomplished through a SPMI bus: the primary PMIC is the controller
> +      device on the SPMI bus, and the secondary PMICs are the target devices
> +      on the SPMI bus.
> +
> +  system-power-controller: true
> +
> +  gpio-controller: true
> +
> +  '#gpio-cells':
> +    const: 2
> +    description: |
> +      The first cell is the pin number, the second cell is used to specify flags.
> +      See ../gpio/gpio.txt for more information.
> +
> +  interrupts:
> +    maxItems: 1
> +
> +  ti,multi-phase-id:
> +    description: |
> +      Describes buck multi-phase configuration, if any. For instance, XY id means
> +      that outputs of buck converters X and Y are combined in multi-phase mode.
> +    $ref: /schemas/types.yaml#/definitions/uint32-array

No improvements here. As Rob pointed out, this looks like coupled
regulators.

Best regards,
Krzysztof