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

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Date:   Tue, 17 Mar 2020 02:18:07 +0000
From:   Peng Fan <peng.fan@....com>
To:     Anson Huang <anson.huang@....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>,
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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
> 
> 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.

Regards,
Peng.

> 
> config KEYBOARD_IMX_SC_KEY
>     tristate "IMX SCU Key Driver"
>     depends on IMX_SCU || COMPILE_TEST
> 
> thanks,
> Anson