linux-kernel - Re: [PATCH] thermal: imx: fix for dependency on cpu-freq

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Message-ID: <e4cf8bad-9a4f-32e5-2f0e-be44257b5fe2@linaro.org>
Date:   Tue, 20 Nov 2018 09:54:29 +0100
From:   Daniel Lezcano <daniel.lezcano@...aro.org>
To:     Anson Huang <anson.huang@....com>,
        "rui.zhang@...el.com" <rui.zhang@...el.com>,
        "edubezval@...il.com" <edubezval@...il.com>,
        "linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Cc:     dl-linux-imx <linux-imx@....com>
Subject: Re: [PATCH] thermal: imx: fix for dependency on cpu-freq

On 20/11/2018 09:47, Anson Huang wrote:
> Hi, Daniel
> 
> Best Regards!
> Anson Huang
> 
>> -----Original Message-----
>> From: Daniel Lezcano [mailto:daniel.lezcano@...aro.org]
>> Sent: 2018年11月20日 16:45
>> To: Anson Huang <anson.huang@....com>; rui.zhang@...el.com;
>> edubezval@...il.com; linux-pm@...r.kernel.org;
>> linux-kernel@...r.kernel.org
>> Cc: dl-linux-imx <linux-imx@....com>
>> Subject: Re: [PATCH] thermal: imx: fix for dependency on cpu-freq
>>
>> On 24/10/2018 08:39, Anson Huang wrote:
>>> The thermal driver is a standalone driver for monitoring SoC
>>> temperature by enabling thermal sensor, so it can be enabled even when
>>> CONFIG_CPU_FREQ is NOT set. So remove the dependency with
>> CPU_THERMAL.
>>>
>>> Add CONFIG_CPU_FREQ check for cpu-freq related operation in thermal
>>> driver to make thermal driver probe successfully when CONFIG_CPU_FREQ
>>> is NOT set.
>>>
>>> Signed-off-by: Anson Huang <Anson.Huang@....com>
>>> ---
>>
>> Why not simply kill this legacy code ?
> 
> Because killing legacy code will have old dtb compatible issue, old dtb
> will NOT have cpufreq cooling function.

Yeah, I imagine that is the reason why you want to keep the legacy code
but do you really care about old DTB based boards? Are they still
updated with newer *upstream vanilla* kernels?


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