linux-kernel - Re: [PATCH v2] hwmon: (tmp401) Add of_match

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Message-ID: <a2e81680-e62c-dddd-ee58-6f5aa3664d2f@roeck-us.net>
Date:   Mon, 2 May 2022 06:57:50 -0700
From:   Guenter Roeck <linux@...ck-us.net>
To:     Camel Guo <camel.guo@...s.com>, Jean Delvare <jdelvare@...e.com>
Cc:     linux-hwmon@...r.kernel.org, linux-kernel@...r.kernel.org,
        kernel@...s.com
Subject: Re: [PATCH v2] hwmon: (tmp401) Add of_match_table

On 5/2/22 02:19, Camel Guo wrote:
> When tmp401 is built as kernel module, it won't be automatically loaded
> even through there is a device node in the devicetree. e.g:
>      i2c {
>        #address-cells = <1>;
>        #size-cells = <0>;
> 
>        sensor@4c {
>          compatible = "ti,tmp401";
>          reg = <0x4c>;
>        };
>      };
> In order to make sure it is loaded automatically, this commit adds
> of_match_table for tmp401.
> 

As mentioned before, historically i2c devices would instantiate based
on the i2c match table. You are claiming that this is no longer the case.
The above is no evidence; that would require a log output on an affected
system showing that the sensors are not or no longer longer instantiated.

I am not absolutely opposed to adding the nodes, but the explanation
needs to match reality. If you can not provide evidence from an actual
boot log, I'll have to implement a tmp401 device model in qemu and test
myself. That will take a while.

Guenter