linux-kernel - RE: [PATCH V12 3/5] thermal: imx_sc: add i.MX system controller thermal support

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Message-ID: <AM0PR04MB4211EF0D257E502C3BF917D0800A0@AM0PR04MB4211.eurprd04.prod.outlook.com>
Date:   Thu, 16 May 2019 10:39:34 +0000
From:   Aisheng Dong <aisheng.dong@....com>
To:     Anson Huang <anson.huang@....com>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "mark.rutland@....com" <mark.rutland@....com>,
        "shawnguo@...nel.org" <shawnguo@...nel.org>,
        "s.hauer@...gutronix.de" <s.hauer@...gutronix.de>,
        "kernel@...gutronix.de" <kernel@...gutronix.de>,
        "festevam@...il.com" <festevam@...il.com>,
        "catalin.marinas@....com" <catalin.marinas@....com>,
        "will.deacon@....com" <will.deacon@....com>,
        "rui.zhang@...el.com" <rui.zhang@...el.com>,
        "edubezval@...il.com" <edubezval@...il.com>,
        "daniel.lezcano@...aro.org" <daniel.lezcano@...aro.org>,
        "ulf.hansson@...aro.org" <ulf.hansson@...aro.org>,
        Daniel Baluta <daniel.baluta@....com>,
        Peng Fan <peng.fan@....com>,
        "heiko@...ech.de" <heiko@...ech.de>,
        "horms+renesas@...ge.net.au" <horms+renesas@...ge.net.au>,
        "agross@...nel.org" <agross@...nel.org>,
        "olof@...om.net" <olof@...om.net>,
        "bjorn.andersson@...aro.org" <bjorn.andersson@...aro.org>,
        "jagan@...rulasolutions.com" <jagan@...rulasolutions.com>,
        "enric.balletbo@...labora.com" <enric.balletbo@...labora.com>,
        "marc.w.gonzalez@...e.fr" <marc.w.gonzalez@...e.fr>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>
CC:     dl-linux-imx <linux-imx@....com>
Subject: RE: [PATCH V12 3/5] thermal: imx_sc: add i.MX system controller
 thermal support

[...]

> > > +		if (!sensor)
> > > +			return -ENOMEM;
> > > +
> > > +		ret = thermal_zone_of_get_sensor_id(child,
> > > +						    &sensor_specs,
> >
> > It looks a bit strange why need sensor_specs as you even did not use it.
> 
> It is because parsing the phandle arguments needs it, such as the
> thermal_zone_of_sensor_register() function needs this pointer to be passed
> back to check the elements are valid or NOT, so the API does NOT define it as
> local structure. The API NOT just return the sensor id, but also the
> of_phandle_args address, although we do NOT need it at all here.

The main problem is this one introduced in 2/5 which needs get ack from maintainer.
For me, I would suggest to make sensor_specs transparent to user if
it's really not needed by users.

Please try to make it either optional or hide to core users as well.
And I guess the later one is doable after a glance at the core code.

Regards
Dong Aisheng