linux-kernel - RE: [PATCH V2 3/9] clk: imx: Support building SCU clock driver as module

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Date:   Wed, 17 Jun 2020 12:26:43 +0000
From:   Anson Huang <anson.huang@....com>
To:     Aisheng Dong <aisheng.dong@....com>,
        "linux@...linux.org.uk" <linux@...linux.org.uk>,
        "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>,
        "mturquette@...libre.com" <mturquette@...libre.com>,
        "sboyd@...nel.org" <sboyd@...nel.org>,
        "oleksandr.suvorov@...adex.com" <oleksandr.suvorov@...adex.com>,
        Stefan Agner <stefan.agner@...adex.com>,
        "arnd@...db.de" <arnd@...db.de>, Abel Vesa <abel.vesa@....com>,
        Peng Fan <peng.fan@....com>,
        "tglx@...utronix.de" <tglx@...utronix.de>,
        "allison@...utok.net" <allison@...utok.net>,
        "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
        "info@...ux.net" <info@...ux.net>,
        Leonard Crestez <leonard.crestez@....com>,
        Andy Duan <fugang.duan@....com>,
        Daniel Baluta <daniel.baluta@....com>,
        "yuehaibing@...wei.com" <yuehaibing@...wei.com>,
        "sfr@...b.auug.org.au" <sfr@...b.auug.org.au>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-clk@...r.kernel.org" <linux-clk@...r.kernel.org>
CC:     dl-linux-imx <linux-imx@....com>
Subject: RE: [PATCH V2 3/9] clk: imx: Support building SCU clock driver as
 module


> Subject: RE: [PATCH V2 3/9] clk: imx: Support building SCU clock driver as
> module
> 
> > From: Anson Huang <Anson.Huang@....com>
> > Sent: Tuesday, June 9, 2020 3:32 PM
> >
> > There are more and more requirements of building SoC specific drivers
> > as modules, add support for building SCU clock driver as module to
> > meet the requirement.
> >
> > Signed-off-by: Anson Huang <Anson.Huang@....com>
> > ---
> > Changes since V1:
> > 	- add ARCH_MXC to build dependency to avoid build fail on x86 arch;
> > 	- move clk-lpcg-scu.c change in to this patch.
> > ---
> >  drivers/clk/imx/Kconfig        | 4 ++--
> >  drivers/clk/imx/Makefile       | 5 ++---
> >  drivers/clk/imx/clk-lpcg-scu.c | 1 +
> >  drivers/clk/imx/clk-scu.c      | 5 +++++
> >  4 files changed, 10 insertions(+), 5 deletions(-)
> >
> > diff --git a/drivers/clk/imx/Kconfig b/drivers/clk/imx/Kconfig index
> > db0253f..ded0643 100644
> > --- a/drivers/clk/imx/Kconfig
> > +++ b/drivers/clk/imx/Kconfig
> > @@ -5,8 +5,8 @@ config MXC_CLK
> >  	def_bool ARCH_MXC
> >
> >  config MXC_CLK_SCU
> > -	bool
> > -	depends on IMX_SCU
> 
> Keep this line as it is
> 
> > +	tristate "IMX SCU clock"
> 
> i.MX SCU Clock core driver
> 
> > +	depends on ARCH_MXC && IMX_SCU
> >
> >  config CLK_IMX8MM
> >  	bool "IMX8MM CCM Clock Driver"
> > diff --git a/drivers/clk/imx/Makefile b/drivers/clk/imx/Makefile index
> > 928f874..1af8cff 100644
> > --- a/drivers/clk/imx/Makefile
> > +++ b/drivers/clk/imx/Makefile
> > @@ -21,9 +21,8 @@ obj-$(CONFIG_MXC_CLK) += \
> >  	clk-sscg-pll.o \
> >  	clk-pll14xx.o
> >
> > -obj-$(CONFIG_MXC_CLK_SCU) += \
> > -	clk-scu.o \
> > -	clk-lpcg-scu.o
> > +mxc-clk-scu-objs += clk-scu.o clk-lpcg-scu.o
> > +obj-$(CONFIG_MXC_CLK_SCU) += mxc-clk-scu.o
> 
> Like i.MX pinctrl, I'm not sure if it's really necessary to build core libraries as
> modules. Probably the simplest way is only building platform drivers part as
> module. And leave those core libraries built in kernel.
> This may make the code a bit cleaner.
> 

Will discuss this with Linaro guys about it, previous requirement I received is
all SoC specific modules need to be built as module.

Anson