linux-kernel - Re: [PATCH v3 1/3] dt-bindings: hwmon: Add Infineon TDA38640

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Date:   Tue, 8 Aug 2023 12:46:59 +0100
From:   Conor Dooley <conor@...nel.org>
To:     Naresh Solanki <naresh.solanki@...ements.com>
Cc:     Guenter Roeck <linux@...ck-us.net>,
        Jean Delvare <jdelvare@...e.com>,
        krzysztof.kozlowski+dt@...aro.org,
        Rob Herring <robh+dt@...nel.org>,
        Conor Dooley <conor+dt@...nel.org>,
        linux-hwmon@...r.kernel.org,
        Patrick Rudolph <patrick.rudolph@...ements.com>,
        Rob Herring <robh@...nel.org>, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 1/3] dt-bindings: hwmon: Add Infineon TDA38640

On Wed, Aug 02, 2023 at 09:31:51PM +0200, Naresh Solanki wrote:
> From: Patrick Rudolph <patrick.rudolph@...ements.com>
> 
> The TDA38640 chip has different output control mechanisms depending on
> its mode of operation. When the chip is in SVID mode, only
> hardware-based output control is supported via ENABLE pin. However, when
> it operates in PMBus mode, software control works perfectly.
> 
> To enable software control as a workaround in SVID mode, add the DT
> property 'infineon,en-svid-control'. This property will enable the
> workaround, which utilizes ENABLE pin polarity flipping for output when
> the chip is in SVID mode.

Why do you need a custom property for this? How come it is not possible
to determine what bus you are on?

Thanks,
Conor.

> 
> Signed-off-by: Patrick Rudolph <patrick.rudolph@...ements.com>
> Signed-off-by: Naresh Solanki <Naresh.Solanki@...ements.com>
> ---
>  .../hwmon/pmbus/infineon,tda38640.yaml        | 51 +++++++++++++++++++
>  .../devicetree/bindings/trivial-devices.yaml  |  2 -
>  2 files changed, 51 insertions(+), 2 deletions(-)
>  create mode 100644 Documentation/devicetree/bindings/hwmon/pmbus/infineon,tda38640.yaml
> 
> diff --git a/Documentation/devicetree/bindings/hwmon/pmbus/infineon,tda38640.yaml b/Documentation/devicetree/bindings/hwmon/pmbus/infineon,tda38640.yaml
> new file mode 100644
> index 000000000000..c5924ddf1b47
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/hwmon/pmbus/infineon,tda38640.yaml
> @@ -0,0 +1,51 @@
> +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +
> +$id: http://devicetree.org/schemas/hwmon/pmbus/infineon,tda38640.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Infineon TDA38640 Synchronous Buck Regulator with SVID and I2C
> +
> +maintainers:
> +  - Naresh Solanki <naresh.solanki@...ements.com>
> +
> +description: |
> +  The Infineon TDA38640 is a 40A Single-voltage Synchronous Buck
> +  Regulator with SVID and I2C designed for Industrial use.
> +
> +  Datasheet: https://www.infineon.com/dgdl/Infineon-TDA38640-0000-DataSheet-v02_04-EN.pdf?fileId=8ac78c8c80027ecd018042f2337f00c9
> +
> +properties:
> +  compatible:
> +    enum:
> +      - infineon,tda38640
> +
> +  reg:
> +    maxItems: 1
> +
> +  infineon,en-svid-control:
> +    description: |
> +      When enabled, it allows the chip to utilize workaround for
> +      software control of output when operating in SVID mode where
> +      hardware-based output control is the default behavior.
> +    type: boolean
> +
> +required:
> +  - compatible
> +  - reg
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    i2c {
> +        #address-cells = <1>;
> +        #size-cells = <0>;
> +
> +        tda38640@40 {
> +            compatible = "infineon,tda38640";
> +            reg = <0x40>;
> +        };
> +    };
> +
> diff --git a/Documentation/devicetree/bindings/trivial-devices.yaml b/Documentation/devicetree/bindings/trivial-devices.yaml
> index 40bc475ee7e1..86c7d34f63bf 100644
> --- a/Documentation/devicetree/bindings/trivial-devices.yaml
> +++ b/Documentation/devicetree/bindings/trivial-devices.yaml
> @@ -151,8 +151,6 @@ properties:
>            - infineon,slb9645tt
>              # Infineon SLB9673 I2C TPM 2.0
>            - infineon,slb9673
> -            # Infineon TDA38640 Voltage Regulator
> -          - infineon,tda38640
>              # Infineon TLV493D-A1B6 I2C 3D Magnetic Sensor
>            - infineon,tlv493d-a1b6
>              # Infineon Multi-phase Digital VR Controller xdpe11280
> 
> base-commit: cb7022b8976e3c4d12cea2e7bb820a2944e2fd7b
> -- 
> 2.41.0
> 

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