RE: [PATCH V3 04/10] clk: imx: Support building SCU clock driver as module

[Anson Huang]

Hi, Arnd

> Subject: Re: [PATCH V3 04/10] clk: imx: Support building SCU clock driver as
> module
> 
> On Wed, Jul 1, 2020 at 9:19 AM Anson Huang <anson.huang@xxxxxxx>
> wrote:
> > > Subject: Re: [PATCH V3 04/10] clk: imx: Support building SCU clock
> > > driver as module On Tue, Jun 30, 2020 at 5:16 AM Anson Huang
> <anson.huang@xxxxxxx> wrote:
> > >
> > > SCU clock driver is a common driver for all SCU based platforms.
> > > Current i.MX8QXP SCU clock driver will be extended to support all
> > > future SCU based platforms.
> > > So theoretically clk-scu.o and clk-imx8qxp.o can be combined. LPCG
> > > is similar.
> > > Maybe you can give a try as Arnd suggested.
> > >
> >
> > Do we really need to link clk-scu and i.MX8QXP clock driver together just to
> avoid some export?
> 
> It was just meant to be easier than exporting a symbol and dealing with
> module dependencies. If it's not easier, then don't.
> 
> > I met some build issues if using this method, the i.MX8QXP module
> > build is OK, but other platforms like
> i.MX8MM/i.MX8MN/i.MX8MQ/i.MX8MP
> > clock drivers are just skipped for build, even these i.MX8M clock
> > config are existing in .config, anyone know why? Looks like the change in
> Makefile for i.MX8QXP clock driver introduce this issue.
> 
> You have a ":=" instead of "+=" typo, so all earlier "+=" are ignored:
> 
> > obj-$(CONFIG_CLK_IMX8MM) += clk-imx8mm.o
> > obj-$(CONFIG_CLK_IMX8MN) += clk-imx8mn.o
> > obj-$(CONFIG_CLK_IMX8MP) += clk-imx8mp.o
> > obj-$(CONFIG_CLK_IMX8MQ) += clk-imx8mq.o
> >
> > obj-$(CONFIG_MXC_CLK_SCU) := clk-imx-scu.o clk-imx-lpcg-scu.o
> 
>                                    ^^^^^^^^

Thanks, I will give another try, I will make the common clk part all linked into each
platform's clock driver, then many exports can be saved.

Thanks,
Anson