linux-kernel - Re: [PATCH v6 1/2] dt-bindings: leds: Add bindings for lm3697 driver

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Message-ID: <ff86540b-c362-ad06-225f-29daab1defdf@ti.com>
Date:   Tue, 11 Sep 2018 13:37:08 -0500
From:   Dan Murphy <dmurphy@...com>
To:     Jacek Anaszewski <jacek.anaszewski@...il.com>,
        Pavel Machek <pavel@....cz>
CC:     <robh+dt@...nel.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <linux-leds@...r.kernel.org>
Subject: Re: [PATCH v6 1/2] dt-bindings: leds: Add bindings for lm3697 driver

Jacek

On 09/11/2018 01:27 PM, Jacek Anaszewski wrote:
> Dan,
> 
> On 09/10/2018 09:51 PM, Dan Murphy wrote:
>> Jacek
>>
>> On 09/10/2018 02:07 PM, Jacek Anaszewski wrote:
>>> Dan, Pavel,
>>>
>>> On 09/10/2018 04:37 PM, Dan Murphy wrote:
>>>> Jacek
>>>>
>>>> On 09/08/2018 02:53 PM, Jacek Anaszewski wrote:
>>>>> Dan,
>>>>>
>>>>> On 09/07/2018 03:52 PM, Dan Murphy wrote:
>>>>> [...]
>>>>>>>
>>>>>>>> And I think Jacek pointed out that the bindings references in this bindings
>>>>>>>> don't even exist.
>>>>>>>>
>>>>>>>> I am thinking we need to deprecate this MFD driver and consolidate these drivers
>>>>>>>> in the LED directory as we indicated before.  I did not find any ti-lmu support
>>>>>>>> code.
>>>>>>>>
>>>>>>>> ti-lmu common core code and then the LED children appending the feature differentiation.
>>>>>>>
>>>>>>>> Need some maintainer weigh in here.
>>>>>>>
>>>>>>> Hehe. I'm maintnainer. Fun.
>>>>>>
>>>>>> I know.  I want to see if there was any other opinion.  Especially for the LED driver.
>>>>>>
>>>>> [...]
>>>>>
>>>>> I have a question - is this lm3697 LED controller a cell of some MFD
>>>>> device? Or is it a self-contained chip?
>>>>>
>>>>
>>>> This is a self contained chip.  And the LM3697 only function is a LED driver.
>>>> It does not have any other special functions like the LM363X drivers for GPIO and Regulator support.
>>>
>>> This is an argument for merging it as a standalone LED class driver
>>> then. It is even more justifiable, taking into account uncertainties
>>> related to the proper way of adding the support for it to the existing
>>> MFD driver, whereas the code reuse would be the only advantage of having
>>> thus support in MFD subsystem.
>>>
>>
>> Does the argument carry over to the other devices?
> 
> If we want to be consequent - yes.
> 
>> Like the LM3632 (part of the ti-lmu) has flash and torch and no other special functions
>> so it would look like the lm3601x family with different register mappings.
> 
> Yes, this is obvious candidate for LED class flash driver.
> 
>> The LM3631 seems to also be just a LED driver with no extra functionality
>>
>> I could go buy an EVM and put together a driver for that device as well using the lm3601x as
>> reference.
> 
> I'm not going to encourage you to make this expense, but to put it
> politically - I'd happily welcome those drivers in the LED subsystem ;-)
> 

Understood.  I am waiting on hardware to test.

Dan

-- 
------------------
Dan Murphy