linux-kernel - Re: [PATCH 2/3] thermal: qoriq_thermal: only enable supported sensors

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Date:   Thu, 15 Jun 2023 12:04:35 +0800
From:   Peng Fan <peng.fan@....nxp.com>
To:     Sebastian Krzyszkowiak <sebastian.krzyszkowiak@...i.sm>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        Peng Fan <peng.fan@....com>,
        "rafael@...nel.org" <rafael@...nel.org>,
        "shawnguo@...nel.org" <shawnguo@...nel.org>,
        "s.hauer@...gutronix.de" <s.hauer@...gutronix.de>
Cc:     "amitk@...nel.org" <amitk@...nel.org>,
        "rui.zhang@...el.com" <rui.zhang@...el.com>,
        "andrew.smirnov@...il.com" <andrew.smirnov@...il.com>,
        "linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "kernel@...gutronix.de" <kernel@...gutronix.de>,
        "festevam@...il.com" <festevam@...il.com>,
        dl-linux-imx <linux-imx@....com>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        Alice Guo <alice.guo@....com>
Subject: Re: [PATCH 2/3] thermal: qoriq_thermal: only enable supported sensors



On 6/15/2023 10:53 AM, Sebastian Krzyszkowiak wrote:
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> 
> 
> On czwartek, 15 czerwca 2023 04:29:01 CEST Peng Fan wrote:
>> On 6/8/2023 3:10 AM, Daniel Lezcano wrote:
>>>
>>> [...]
>>>
>>> Ok, I misunderstood. I thought that was for failing registered thermal
>>> zone.
>>>
>>> Would enabling the site in ops->change_mode do the trick ?
>>
>> No. ops->change_mode not able to do the trick.
>>
>> devm_thermal_of_zone_register->thermal_zone_device_enable
>> ->thermal_zone_device_set_mode->__thermal_zone_device_update.part.0
>> ->__thermal_zone_get_temp
>>
>> The thermal_zone_device_set_mode will call change_mode, if return
>> fail here, the thermal zone will fail to be registered.
>>
>> Thanks,
>> Peng.
> 
> I think the idea is not to return a failure in ops->change_mode, but to move
> enabling the site in REGS_TMR/REGS_V2_TMSR register from
> qoriq_tmu_register_tmu_zone to ops->change_mode. 

But qoriq_tmu_register_tmu_zone will finally call ops->change_mode.

And it is per zone, so we not able to enable TMR_ME here.

This way the site will be
> enabled only for actually existing thermal zones, since those not described in
> the device tree won't reach thermal_zone_device_enable.

No. The TMR_ME is the gate for all sites.

Thanks,
Peng.
> 
> S.
> 
>