linux-kernel - Re: [PATCH v1 1/3] pwm: dwc: Add 16 channel support for Intel Elkhart Lake

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Date: Wed, 7 Feb 2024 15:11:07 +0200
From: Jarkko Nikula <jarkko.nikula@...ux.intel.com>
To: Raag Jadav <raag.jadav@...el.com>,
 Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc: u.kleine-koenig@...gutronix.de, mika.westerberg@...ux.intel.com,
 lakshmi.sowjanya.d@...el.com, linux-pwm@...r.kernel.org,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1 1/3] pwm: dwc: Add 16 channel support for Intel Elkhart
 Lake

On 2/7/24 13:48, Raag Jadav wrote:
> On Fri, Feb 02, 2024 at 06:02:46AM +0200, Raag Jadav wrote:
>> On Thu, Feb 01, 2024 at 01:26:53PM +0200, Andy Shevchenko wrote:
>>> On Tue, Jan 30, 2024 at 12:30:23PM +0200, Raag Jadav wrote:
>>>> On Sun, Jan 28, 2024 at 04:53:24PM +0200, Andy Shevchenko wrote:
>>>>> On Mon, Jan 22, 2024 at 08:32:36AM +0530, Raag Jadav wrote:
>>>>>> Intel Elkhart Lake PSE includes two instances of PWM as a single PCI
>>>>>> function with 8 channels each. Add support for the remaining channels.
>>>
>>> ...
>>>
>>>>> First option: Always provide driver data (info is never NULL).
>>>>
>>>> Allowing empty driver_data would save us from adding dummy info
>>>> for single instance devices in the future.
>>>
>>> Which may be too premature "optimisation". Why? Because if we ever have
>>> something like pci_dev_get_match_data(), the empty will mean NULL, and
>>> we may not get difference between empty and missing one.
>>
>> Not sure if I'm able to find such a helper as of now, but fair.
>> I can change it in v2 if Jarkko is okay with it.
> 
> Hi Jarkko,
> 
> If you agree with Andy's comments, please let me know.
> Will send out a v2 accordingly.
> 
Ah, sorry, I didn't have opinion.