linux-kernel - Re: [PATCH 1/3] hwmon: max31827: Add PEC support

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Message-ID: <6732bd18-2157-4ccb-b02c-43f3350e89cb@roeck-us.net>
Date: Mon, 18 Dec 2023 08:18:26 -0800
From: Guenter Roeck <linux@...ck-us.net>
To: "Matyas, Daniel" <Daniel.Matyas@...log.com>
Cc: Jean Delvare <jdelvare@...e.com>, Rob Herring <robh+dt@...nel.org>,
 Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
 Conor Dooley <conor+dt@...nel.org>, Jonathan Corbet <corbet@....net>,
 "linux-hwmon@...r.kernel.org" <linux-hwmon@...r.kernel.org>,
 "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
 "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
 "linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>
Subject: Re: [PATCH 1/3] hwmon: max31827: Add PEC support

On 12/18/23 01:12, Matyas, Daniel wrote:
> 
> 
>> -----Original Message-----
>> From: Guenter Roeck <groeck7@...il.com> On Behalf Of Guenter Roeck
>> Sent: Saturday, December 16, 2023 3:33 AM
>> To: Matyas, Daniel <Daniel.Matyas@...log.com>
>> Cc: Jean Delvare <jdelvare@...e.com>; Rob Herring
>> <robh+dt@...nel.org>; Krzysztof Kozlowski
>> <krzysztof.kozlowski+dt@...aro.org>; Conor Dooley
>> <conor+dt@...nel.org>; Jonathan Corbet <corbet@....net>; linux-
>> hwmon@...r.kernel.org; devicetree@...r.kernel.org; linux-
>> kernel@...r.kernel.org; linux-doc@...r.kernel.org
>> Subject: Re: [PATCH 1/3] hwmon: max31827: Add PEC support
>>
>> [External]
>>
>> On 12/15/23 12:28, Matyas, Daniel wrote:
>>>
>>>
>>>> -----Original Message-----
>>>> From: Guenter Roeck <groeck7@...il.com> On Behalf Of Guenter
>> Roeck
>>>> Sent: Thursday, December 14, 2023 6:10 PM
>>>> To: Matyas, Daniel <Daniel.Matyas@...log.com>
>>>> Cc: Jean Delvare <jdelvare@...e.com>; Rob Herring
>>>> <robh+dt@...nel.org>; Krzysztof Kozlowski
>>>> <krzysztof.kozlowski+dt@...aro.org>; Conor Dooley
>>>> <conor+dt@...nel.org>; Jonathan Corbet <corbet@....net>; linux-
>>>> hwmon@...r.kernel.org; devicetree@...r.kernel.org; linux-
>>>> kernel@...r.kernel.org; linux-doc@...r.kernel.org
>>>> Subject: Re: [PATCH 1/3] hwmon: max31827: Add PEC support
>>>>
>>>> [External]
>>>>
>>>> On 12/14/23 06:36, Daniel Matyas wrote:
>>>>> Removed regmap and used my functions to read, write and update
>> bits.
>>>>> In these functions i2c_smbus_ helper functions are used. These check
>>>>> if there were any PEC errors during read. In the write function, if
>>>>> PEC is enabled, I check for PEC Error bit, to see if there were any
>> errors.
>>>>>
>>>>> Signed-off-by: Daniel Matyas <daniel.matyas@...log.com>
>>>>
>>>> The "PEC" attribute needs to be attached to the I2C device.
>>>> See lm90.c or pmbus_core.c for examples.
>>>>
>>>
>>> I added pec_show() and pec_store() functions and created the pec file
>> within the max31827_groups.
>>> I did not set the flags, because I want them to be set only in pec_store.
>> By default the PEC flag should not be set.
>>>
>>
>> That is not the point. Again,
>>
>>   >> The "PEC" attribute needs to be attached to the I2C device.
>>   >> See lm90.c or pmbus_core.c for examples.
>>
>> That is not about regmap, it is about the location of the "pec" attribute.
>>
> 
> I understand that this is not about regmap. Still, I would argue, that when I am registering the device with groups, the "pec" attribute is attached.
> 

Sure. To the hwmon device. I asked you to attach it to the i2c device, as
implemented all other hwmon drivers supporting this attribute. I am not
inclined to make an exception for this driver, and I do not see a reason
to do so.

Guenter