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

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Date:   Thu, 18 Jun 2020 03:18:25 +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 2/9] ARM: imx: Select MXC_CLK for ARCH_MXC



> -----Original Message-----
> From: Aisheng Dong <aisheng.dong@....com>
> Sent: 2020年6月18日 11:09
> To: Anson Huang <anson.huang@....com>; linux@...linux.org.uk;
> shawnguo@...nel.org; s.hauer@...gutronix.de; kernel@...gutronix.de;
> festevam@...il.com; mturquette@...libre.com; sboyd@...nel.org;
> oleksandr.suvorov@...adex.com; Stefan Agner <stefan.agner@...adex.com>;
> arnd@...db.de; Abel Vesa <abel.vesa@....com>; Peng Fan
> <peng.fan@....com>; tglx@...utronix.de; allison@...utok.net;
> gregkh@...uxfoundation.org; info@...ux.net; Leonard Crestez
> <leonard.crestez@....com>; Andy Duan <fugang.duan@....com>; Daniel
> Baluta <daniel.baluta@....com>; yuehaibing@...wei.com;
> sfr@...b.auug.org.au; linux-arm-kernel@...ts.infradead.org;
> linux-kernel@...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: 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.

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.

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