linux-kernel - Re: [PATCH] hwmon: (pmbus/tda38640) Add driver for Infineon TDA38640 Voltage Regulator

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Message-ID: <d8fb3c45-435d-f080-6ba4-e9e4595f3638@linaro.org>
Date:   Tue, 24 Jan 2023 13:05:26 +0100
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Naresh Solanki <naresh.solanki@...ements.com>,
        Guenter Roeck <linux@...ck-us.net>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Jean Delvare <jdelvare@...e.com>
Cc:     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] hwmon: (pmbus/tda38640) Add driver for Infineon TDA38640
 Voltage Regulator

On 24/01/2023 12:45, Naresh Solanki wrote:
> Hi
> 
> On 24-01-2023 04:40 pm, Krzysztof Kozlowski wrote:
>> On 24/01/2023 12:01, Naresh Solanki wrote:
>>> From: Patrick Rudolph <patrick.rudolph@...ements.com>
>>>
>>> Add the pmbus driver for the Infineon TDA38640 voltage regulator.
>>>
>>> Signed-off-by: Patrick Rudolph <patrick.rudolph@...ements.com>
>>> Signed-off-by: Naresh Solanki <Naresh.Solanki@...ements.com>
>>> ---
>>>   .../devicetree/bindings/trivial-devices.yaml  |  2 +
>>
>> Split bindings from driver code.
> Sure
>>
>>>   drivers/hwmon/pmbus/Kconfig                   | 16 ++++
>>>   drivers/hwmon/pmbus/Makefile                  |  1 +
>>>   drivers/hwmon/pmbus/tda38640.c                | 78 +++++++++++++++++++
>>>   4 files changed, 97 insertions(+)
>>>   create mode 100644 drivers/hwmon/pmbus/tda38640.c
>>>
>>> diff --git a/Documentation/devicetree/bindings/trivial-devices.yaml b/Documentation/devicetree/bindings/trivial-devices.yaml
>>> index f5c0a6283e61..a28b02036489 100644
>>> --- a/Documentation/devicetree/bindings/trivial-devices.yaml
>>> +++ b/Documentation/devicetree/bindings/trivial-devices.yaml
>>> @@ -141,6 +141,8 @@ 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
>>> diff --git a/drivers/hwmon/pmbus/Kconfig b/drivers/hwmon/pmbus/Kconfig
>>> index 30448e049486..9f4bbb9c487a 100644
>>> --- a/drivers/hwmon/pmbus/Kconfig
>>> +++ b/drivers/hwmon/pmbus/Kconfig
>>> @@ -395,6 +395,22 @@ config SENSORS_STPDDC60
>>>   	  This driver can also be built as a module. If so, the module will
>>>   	  be called stpddc60.
>>>   
>>> +config SENSORS_TDA38640
>>> +	tristate "Infineon TDA38640"
>>> +	help
>>> +	  If you say yes here you get hardware monitoring support for Infineon
>>> +	  TDA38640.
>>> +
>>> +	  This driver can also be built as a module. If so, the module will
>>> +	  be called tda38640.
>>> +
>>> +config SENSORS_TDA38640_REGULATOR
>>> +	bool "Regulator support for TDA38640 and compatibles"
>>> +	depends on SENSORS_TDA38640 && REGULATOR
>>> +	help
>>> +	  If you say yes here you get regulator support for Infineon
>>> +	  TDA38640 as regulator.
>>
>> Drop entire option, why is it needed?
> You mean regulator option ?
> This is how other pmbus regulator devices have provided option.

Hmmm... I wonder why this is of any use.

>>
>>> +
>>>   config SENSORS_TPS40422
>>>   	tristate "TI TPS40422"
>>>   	help

(...)

>>
>>> +static const struct of_device_id tda38640_of_match[] = {
>>> +	{ .compatible = "infineon,tda38640"},
>>> +	{ },
>>> +};
>>> +MODULE_DEVICE_TABLE(of, tda38640_of_match);
>>
>> Where is it used? You miss the user.
> I'm not sure if I get your question right.
> This chip is used in sbp1 board to power CPU rails.

No, where is the data structure used (except module autoloading)?

Best regards,
Krzysztof