linux-kernel - Re: [PATCH v11 2/2] mfd: max597x: Add support for MAX5970 and MAX5978

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Date:   Wed, 14 Dec 2022 16:01:28 +0530
From:   Naresh Solanki <naresh.solanki@...ements.com>
To:     Lee Jones <lee@...nel.org>
Cc:     linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
        Patrick Rudolph <patrick.rudolph@...ements.com>,
        Marcello Sylvester Bauer <sylv@...v.io>
Subject: Re: [PATCH v11 2/2] mfd: max597x: Add support for MAX5970 and MAX5978

Hi Lee,

On 14-12-2022 03:17 pm, Lee Jones wrote:
> On Wed, 14 Dec 2022, Naresh Solanki wrote:
> 
>> Hi Lee
>>
>> On 08-12-2022 05:53 pm, Lee Jones wrote:
>>> On Fri, 18 Nov 2022, Naresh Solanki wrote:
>>>
>>>>
>>>>
>>>> On 17-11-2022 03:45 pm, Lee Jones wrote:
>>>>> On Wed, 16 Nov 2022, Naresh Solanki wrote:
>>>>>
>>>>>> From: Patrick Rudolph <patrick.rudolph@...ements.com>
>>>>>>
>>>>>> Implement a regulator driver with IRQ support for fault management.
>>>>>> Written against documentation [1] and [2] and tested on real hardware.
>>>>>>
>>>>>> Every channel has its own regulator supplies nammed 'vss1-supply' and
>>>>>> 'vss2-supply'. The regulator supply is used to determine the output
>>>>>> voltage, as the smart switch provides no output regulation.
>>>>>> The driver requires the 'shunt-resistor-micro-ohms' property to be
>>>>>> present in Device Tree to properly calculate current related
>>>>>> values.
>>>>>>
>>>>>> Datasheet links:
>>>>>> 1: https://datasheets.maximintegrated.com/en/ds/MAX5970.pdf
>>>>>> 2: https://datasheets.maximintegrated.com/en/ds/MAX5978.pdf
>>>>>>
>>>>>> Signed-off-by: Patrick Rudolph <patrick.rudolph@...ements.com>
>>>>>> Co-developed-by: Marcello Sylvester Bauer <sylv@...v.io>
>>>>>> Signed-off-by: Marcello Sylvester Bauer <sylv@...v.io>
>>>>>> Co-developed-by: Naresh Solanki <Naresh.Solanki@...ements.com>
>>>>>> Signed-off-by: Naresh Solanki <Naresh.Solanki@...ements.com>
>>>>>> ---
>>>>>>     drivers/mfd/Kconfig         |  12 +++++
>>>>>>     drivers/mfd/Makefile        |   1 +
>>>>>>     drivers/mfd/max597x.c       |  93 +++++++++++++++++++++++++++++++++
>>>>>>     include/linux/mfd/max597x.h | 101 ++++++++++++++++++++++++++++++++++++
>>>>>>     4 files changed, 207 insertions(+)
>>>>>>     create mode 100644 drivers/mfd/max597x.c
>>>>>>     create mode 100644 include/linux/mfd/max597x.h
>>>>>
>>>>> Ignoring my comments won't make them go away. :)
>>>>>
>>>>> Please tell me why you need a whole new driver, instead of adding
>>>>> support to simple-mfd-i2c?
>>>>>
>>>> I felt current implementation to be simpler, clearer & straight forward.
>>>
>>> If you can make it work with simple-mfd-i2c, please do so.
>> simple-mfd-i2c doesn't has mechanism to pass device type(max5978 vs
>> max5970).
> 
> `git grep silergy,sy7636a -- drivers/mfd`
I did check the driver but there is no mechanism to distinguish between 
chip variant i.e., 597x-regulator driver should be able to distinguish 
between max5978 vs max5970 chip type.
> 
>>> No need to submit an entirely new driver for these simple use-cases.
>