linux-kernel - Re: [PATCH v5 2/2] hwmon: ltc2991: add driver support

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Date:   Mon, 30 Oct 2023 07:15:19 -0700
From:   Guenter Roeck <linux@...ck-us.net>
To:     "Miclaus, Antoniu" <Antoniu.Miclaus@...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 v5 2/2] hwmon: ltc2991: add driver support

On 10/30/23 00:59, Miclaus, Antoniu wrote:
> 
>> On Thu, Oct 26, 2023 at 01:33:13PM +0300, Antoniu Miclaus wrote:
>>> Add support for LTC2991 Octal I2C Voltage, Current, and Temperature
>>> Monitor.
>>>
>>> The LTC2991 is used to monitor system temperatures, voltages and
>>> currents. Through the I2C serial interface, the eight monitors can
>>> individually measure supply voltages and can be paired for
>>> differential measurements of current sense resistors or temperature
>>> sensing transistors. Additional measurements include internal
>>> temperature and internal VCC.
>>>
>>> Signed-off-by: Antoniu Miclaus <antoniu.miclaus@...log.com>
>>
>> Applied. I do have one comment (see below) about code which
>> I would normally reject, but I am getting tired.
>>
>> [ ... ]
>>
>>> +
>>> +struct ltc2991_state {
>>> +	struct device		*dev;
>>
>> It is completely pointless to have a reference to dev in struct
>> ltc2991_state because it is only used in the init function and
>> dereferenced six times there. It would have been much easier to
>> pass it as argument to that function. That would also have avoided
>> the wrong assumption or expectation that it is needed/used elsewhere.
>>
>> Guenter
> Sorry for the misunderstanding. I took as reference some old driver
> implementations from the mainline kernel.
> 

You can find examples for pretty much everything in the kernel, including
pretty much everything bad and pointless.

> Is it fine if I do a follow-up patch on this subject in the near future?
> 

If you wish. I already accepted your patch.

Guenter