linux-kernel - Re: [PATCH v2 3/3] hwmon: (pmbus/core): Implement irq support

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Date:   Tue, 29 Nov 2022 07:29:11 -0800
From:   Guenter Roeck <linux@...ck-us.net>
To:     Naresh Solanki <naresh.solanki@...ements.com>,
        linux-hwmon@...r.kernel.org, Jean Delvare <jdelvare@...e.com>
Cc:     Patrick Rudolph <patrick.rudolph@...ements.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 3/3] hwmon: (pmbus/core): Implement irq support

On 11/29/22 00:16, Naresh Solanki wrote:
> Hi Guenter,
> 
> On 29-11-2022 04:39 am, Guenter Roeck wrote:
>> On 11/28/22 09:47, Naresh Solanki wrote:
>>> From: Patrick Rudolph <patrick.rudolph@...ements.com>
>>>
>>> Implement PMBUS irq handler to notify regulator events.
>>>
>>> Signed-off-by: Patrick Rudolph <patrick.rudolph@...ements.com>
>>> Signed-off-by: Naresh Solanki <Naresh.Solanki@...ements.com>
>>
>> As I am sure I have mentioned before, this needs to primarily handle
>> sysfs notifications to hwmon status attributes and to generate kobject
>> events. Regulator events are secondary / optional.
> 
> Based on previous feedback, PMBus interrupt handler is made generic
> Based on the use case I have in my machine, my application need to monitor regulator event as soon as they occur and hence the patch.
> 

I understand, but this isn't just about your specific use case. Your use case is
what triggers the change, and ensures that the code change is tested, but the
impact by far reaches beyond your specific use case and needs to address other
(much more common) use cases as well. Interrupt support is needed in the pmbus
code, but it needs to address the common use case first, and that is reporting
the status via sysfs notifications and kobject events.

Thanks,
Guenter