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From:   Arnd Bergmann <arnd@arndb.de>
Date:   Thu, 2 Jul 2020 09:43:04 +0200
Message-ID: <CAK8P3a0hrDs-PXHaCfBx1As0BP8GwSZ+7zPLCMgxXOAhk=4CMQ@mail.gmail.com>
Subject: Re: [PATCH V4 3/5] clk: imx: Support building i.MX common clock
 driver as module
To:     Anson Huang <anson.huang@nxp.com>
Cc:     Dong Aisheng <dongas86@gmail.com>,
        Michael Turquette <mturquette@baylibre.com>,
        Stephen Boyd <sboyd@kernel.org>,
        Shawn Guo <shawnguo@kernel.org>,
        Sascha Hauer <s.hauer@pengutronix.de>,
        Sascha Hauer <kernel@pengutronix.de>,
        Fabio Estevam <festevam@gmail.com>,
        Peng Fan <peng.fan@nxp.com>, Abel Vesa <abel.vesa@nxp.com>,
        Aisheng Dong <aisheng.dong@nxp.com>,
        Andy Duan <fugang.duan@nxp.com>,
        Daniel Baluta <daniel.baluta@nxp.com>,
        YueHaibing <yuehaibing@huawei.com>,
        Stephen Rothwell <sfr@canb.auug.org.au>,
        linux-clk <linux-clk@vger.kernel.org>,
        open list <linux-kernel@vger.kernel.org>,
        "moderated list:ARM/FREESCALE IMX / MXC ARM ARCHITECTURE" 
        <linux-arm-kernel@lists.infradead.org>,
        dl-linux-imx <linux-imx@nxp.com>
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On Thu, Jul 2, 2020 at 9:12 AM Anson Huang <anson.huang@nxp.com> wrote:
> >
> > The question is whether the #ifdef check in the header to test for MODULE
> > (only calling it if this particular soc has a built-in clk driver, which is sufficient)
> > or for IS_MODULE(CONFIG_MXC_CLK) (call it if _any_ clk driver is built-in and
> > the function exists, which leaves extra code in the driver but is a more
> > conventional check).
> >
>
> So you prefer to add an empty inline function for imx_register_uart_clocks() with check
> of MODULE build?

Yes, I want the empty inline stub, but either symbol check would work

> Even with this, we still need to add MODULE build check to whole block
> of this earlycon uart clock handler in imx/clk.c.

Correct.

      Arnd