linux-kernel - RE: [PATCH V3 1/7] firmware: imx: Add stubs for !CONFIG_IMX

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Date:   Tue, 17 Mar 2020 02:29:47 +0000
From:   Anson Huang <anson.huang@....com>
To:     Peng Fan <peng.fan@....com>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>
CC:     Shawn Guo <shawnguo@...nel.org>,
        "s.hauer@...gutronix.de" <s.hauer@...gutronix.de>,
        "kernel@...gutronix.de" <kernel@...gutronix.de>,
        "festevam@...il.com" <festevam@...il.com>,
        "dmitry.torokhov@...il.com" <dmitry.torokhov@...il.com>,
        "a.zummo@...ertech.it" <a.zummo@...ertech.it>,
        "rui.zhang@...el.com" <rui.zhang@...el.com>,
        "daniel.lezcano@...aro.org" <daniel.lezcano@...aro.org>,
        "amit.kucheria@...durent.com" <amit.kucheria@...durent.com>,
        "wim@...ux-watchdog.org" <wim@...ux-watchdog.org>,
        "linux@...ck-us.net" <linux@...ck-us.net>,
        Daniel Baluta <daniel.baluta@....com>,
        "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
        "linux@...pel-privat.de" <linux@...pel-privat.de>,
        "tglx@...utronix.de" <tglx@...utronix.de>,
        "m.felsch@...gutronix.de" <m.felsch@...gutronix.de>,
        "andriy.shevchenko@...ux.intel.com" 
        <andriy.shevchenko@...ux.intel.com>,
        "arnd@...db.de" <arnd@...db.de>,
        "ronald@...ovation.ch" <ronald@...ovation.ch>,
        "krzk@...nel.org" <krzk@...nel.org>,
        "robh@...nel.org" <robh@...nel.org>,
        Leonard Crestez <leonard.crestez@....com>,
        Aisheng Dong <aisheng.dong@....com>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-input@...r.kernel.org" <linux-input@...r.kernel.org>,
        "linux-rtc@...r.kernel.org" <linux-rtc@...r.kernel.org>,
        "linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
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        dl-linux-imx <linux-imx@....com>
Subject: RE: [PATCH V3 1/7] firmware: imx: Add stubs for !CONFIG_IMX_SCU case



> Subject: RE: [PATCH V3 1/7] firmware: imx: Add stubs for !CONFIG_IMX_SCU
> case
> 
> > Subject: RE: [PATCH V3 1/7] firmware: imx: Add stubs for
> > !CONFIG_IMX_SCU case
> >
> > Hi, Alexandre
> >
> > > -----Original Message-----
> > > From: Alexandre Belloni <alexandre.belloni@...tlin.com>
> > > Sent: Monday, March 16, 2020 5:16 PM
> > > To: Anson Huang <anson.huang@....com>
> > > Cc: Shawn Guo <shawnguo@...nel.org>; Peng Fan <peng.fan@....com>;
> > > s.hauer@...gutronix.de; kernel@...gutronix.de; festevam@...il.com;
> > > dmitry.torokhov@...il.com; a.zummo@...ertech.it;
> > rui.zhang@...el.com;
> > > daniel.lezcano@...aro.org; amit.kucheria@...durent.com; wim@...ux-
> > > watchdog.org; linux@...ck-us.net; Daniel Baluta
> > > <daniel.baluta@....com>; gregkh@...uxfoundation.org;
> > > linux@...pel-privat.de; tglx@...utronix.de; m.felsch@...gutronix.de;
> > > andriy.shevchenko@...ux.intel.com;
> > > arnd@...db.de; ronald@...ovation.ch; krzk@...nel.org;
> > > robh@...nel.org; Leonard Crestez <leonard.crestez@....com>; Aisheng
> > > Dong <aisheng.dong@....com>; linux-arm-kernel@...ts.infradead.org;
> > > linux- kernel@...r.kernel.org; linux-input@...r.kernel.org; linux-
> > > rtc@...r.kernel.org; linux-pm@...r.kernel.org; linux-
> > > watchdog@...r.kernel.org; dl-linux-imx <linux-imx@....com>
> > > Subject: Re: [PATCH V3 1/7] firmware: imx: Add stubs for
> > > !CONFIG_IMX_SCU case
> > >
> > > On 16/03/2020 09:08:53+0000, Anson Huang wrote:
> > > > > Why do you absolutely need to compile them independently? From a
> > > > > code coverage point of view, having:
> > > > >
> > > > > COMPILE_TEST=y
> > > > > CONFIG_IMX_SCU=y
> > > > >
> > > > > is enough to select and compile the remaining drivers.
> > > >
> > > > What I meant is for below case, like using other arch config which
> > > > does NOT have CONFIG_IMX_SCU selected, ONLY with COMPILE_TEST
> > > > selected, adding stubs for IMX_SCU APIs can fix such scenario.
> > > >
> > > > COMPILE_TEST=y
> > > > CONFIG_IMX_SCU=n
> > > >
> > >
> > > Why is that an issue? If they don't have IMX_SCU selected, then the
> > > other SCU driver are not selected either, having stubs doesn't
> > > change that you will have to select at least one option. Please
> > > explain what is the issue that is not solved here.
> >
> > OK, what I thought is even without IMX_SCU selected, other SCU drivers
> > still can be selected for build test after adding "COMPILE_TEST" to
> > the kconfig, like below, if without IMX_SCU API stubs, the
> > "COMPILE_TEST" can NOT be added to SCU drivers to enable build test,
> > so I think the IMX_SCU API stubs should be added?
> 
> Forgot to mention, without stub api, for drivers with " #include
> <linux/firmware/imx/sci.h> " will met compile error without
> +#ifdef CONFIG_IMX_SCU
> +#endif
> 
> So we have to use ifdef CONFIG_IMX_SCU to guard the include.

The idea here is that all modules depending on IMX_SCU should NOT be enabled
without IMX_SCU enabled. So it should be fine.

Anson