linux-kernel - RE: [PATCH V2 2/9] ARM: imx: Select MXC_CLK for ARCH

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Message-ID: <AM6PR04MB496695B4659CEE5AD7C00C6C809B0@AM6PR04MB4966.eurprd04.prod.outlook.com>
Date:   Thu, 18 Jun 2020 03:58:29 +0000
From:   Aisheng Dong <aisheng.dong@....com>
To:     Anson Huang <anson.huang@....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 2/9] ARM: imx: Select MXC_CLK for ARCH_MXC

> From: Anson Huang <anson.huang@....com>
> Sent: Thursday, June 18, 2020 11:18 AM
> 
> > From: Aisheng Dong <aisheng.dong@....com>
> > Sent: 2020年6月18日 11:09
> >
> > > From: Anson Huang <anson.huang@....com>
> > > Sent: Wednesday, June 17, 2020 8:36 PM
> > >
> > > > Subject: RE: [PATCH V2 2/9] ARM: imx: Select MXC_CLK for ARCH_MXC
> > > >
> > > > > From: Anson Huang <Anson.Huang@....com>
> > > > > Sent: Tuesday, June 9, 2020 3:32 PM
> > > > >
> > > > > i.MX common clock drivers may support module build, so it is NOT
> > > > > selected by default, for ARCH_MXC ARMv7 platforms, need to
> > > > > select it manually to make build pass.
> > > > >
> > > > > Signed-off-by: Anson Huang <Anson.Huang@....com>
> > > >
> > > > Can't the original def_xxx work?
> > > >
> > > > config MXC_CLK
> > > >         tristate
> > > >         def_tristate ARCH_MXC
> > >
> > > Such change will make MXC_CLK=y even all i.MX8 SoCs clock drivers
> > > are selected as module, so it does NOT meet the requirement of
> > > module support. Below is from .config when all
> > > i.MX8 SoCs clock drivers are configured to module.
> > >
> > >  CONFIG_MXC_CLK=y
> > >  CONFIG_MXC_CLK_SCU=m
> > >  CONFIG_CLK_IMX8MM=m
> > >  CONFIG_CLK_IMX8MN=m
> > >  CONFIG_CLK_IMX8MP=m
> > >  CONFIG_CLK_IMX8MQ=m
> > >  CONFIG_CLK_IMX8QXP=m
> > >
> >
> > It works at my side.
> > Below is my changes based on your patchset:
> > $ git diff
> > diff --git a/arch/arm/mach-imx/Kconfig b/arch/arm/mach-imx/Kconfig
> > index
> > 47b10d20f411..e7d7b90e2cf8 100644
> > --- a/arch/arm/mach-imx/Kconfig
> > +++ b/arch/arm/mach-imx/Kconfig
> > @@ -4,7 +4,6 @@ menuconfig ARCH_MXC
> >         depends on ARCH_MULTI_V4_V5 || ARCH_MULTI_V6_V7 ||
> > ARM_SINGLE_ARMV7M
> >         select ARCH_SUPPORTS_BIG_ENDIAN
> >         select CLKSRC_IMX_GPT
> > -       select MXC_CLK
> >         select GENERIC_IRQ_CHIP
> >         select GPIOLIB
> >         select PINCTRL
> > diff --git a/drivers/clk/imx/Kconfig b/drivers/clk/imx/Kconfig index
> > 26cedbfe386c..f7b3e3a2cb9f 100644
> > --- a/drivers/clk/imx/Kconfig
> > +++ b/drivers/clk/imx/Kconfig
> > @@ -3,6 +3,7 @@
> >  config MXC_CLK
> >         tristate "IMX clock"
> >         depends on ARCH_MXC
> > +       def_tristate ARCH_MXC
> >
> >  config MXC_CLK_SCU
> >         tristate "IMX SCU clock"
> >
> 
> I guess you tried imx_v6_v7_defconfig? It does NOT work for ARM64 defconfig
> when we try to make CONFIG_MXC_CLK=m, Below are my change, you can see
> in .config, even all i.MX8 SoCs clock drivers are configured to module, the
> CONFIG_MXC_CLK is still =y, but the expected result is =m.
> 

It works at my side because it can manually selected as m or add CONFIG_MXC_CLK=m
In defconfig.
But now I got your point you want CONFIG_MXC_CLK default to m once define
CONFIG_CLK_IMX8X=m in defconfig.

> BTW, all i.MX8 SoCs select MXC_CLK in their kconfig, this patch just does the
> same thing for i.MX6/7 in common place.
> 

I just noticed for MX6&7, actually CONFIG_MXC_CLK can't be m otherwise we will meet build break.
That means CONFIG_MXC_CLK cannot be configurable by users for non-ARM64 platforms.
Thus can't use def_tristate and we still need select it under ARCH_MXC.
This lightly lose a bit meaning to make this core library as module.

IMHO I'd still prefer to builtin those core libraries rather than convert to module.

Regards
Aisheng

> diff --git a/arch/arm/mach-imx/Kconfig b/arch/arm/mach-imx/Kconfig index
> 47b10d2..e7d7b90 100644
> --- a/arch/arm/mach-imx/Kconfig
> +++ b/arch/arm/mach-imx/Kconfig
> @@ -4,7 +4,6 @@ menuconfig ARCH_MXC
>         depends on ARCH_MULTI_V4_V5 || ARCH_MULTI_V6_V7 ||
> ARM_SINGLE_ARMV7M
>         select ARCH_SUPPORTS_BIG_ENDIAN
>         select CLKSRC_IMX_GPT
> -       select MXC_CLK
>         select GENERIC_IRQ_CHIP
>         select GPIOLIB
>         select PINCTRL
> diff --git a/arch/arm64/configs/defconfig b/arch/arm64/configs/defconfig index
> 8222e4b..21e2dbb 100644
> --- a/arch/arm64/configs/defconfig
> +++ b/arch/arm64/configs/defconfig
> @@ -799,11 +799,11 @@ CONFIG_COMMON_CLK_S2MPS11=y
> CONFIG_COMMON_CLK_PWM=y  CONFIG_COMMON_CLK_VC5=y
> CONFIG_CLK_RASPBERRYPI=m -CONFIG_CLK_IMX8MM=y
> -CONFIG_CLK_IMX8MN=y -CONFIG_CLK_IMX8MP=y -CONFIG_CLK_IMX8MQ=y
> -CONFIG_CLK_IMX8QXP=y
> +CONFIG_CLK_IMX8MM=m
> +CONFIG_CLK_IMX8MN=m
> +CONFIG_CLK_IMX8MP=m
> +CONFIG_CLK_IMX8MQ=m
> +CONFIG_CLK_IMX8QXP=m
>  CONFIG_TI_SCI_CLK=y
>  CONFIG_COMMON_CLK_QCOM=y
>  CONFIG_QCOM_A53PLL=y
> diff --git a/drivers/clk/imx/Kconfig b/drivers/clk/imx/Kconfig index
> 26cedbf..f7b3e3a 100644
> --- a/drivers/clk/imx/Kconfig
> +++ b/drivers/clk/imx/Kconfig
> @@ -3,6 +3,7 @@
>  config MXC_CLK
>         tristate "IMX clock"
>         depends on ARCH_MXC
> +       def_tristate ARCH_MXC
> 
>  config MXC_CLK_SCU
>         tristate "IMX SCU clock"
> 
> .config:
>  CONFIG_MXC_CLK=y
>  CONFIG_MXC_CLK_SCU=m
>  CONFIG_CLK_IMX8MM=m
>  CONFIG_CLK_IMX8MN=m
>  CONFIG_CLK_IMX8MP=m
>  CONFIG_CLK_IMX8MQ=m
>  CONFIG_CLK_IMX8QXP=m
> 
> Anson