linux-kernel - RE: [PATCH v12 9/9] ARM: sp7021_defconfig: Add Sunplus SP7021 defconfig

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Message-ID: <334463c7f78b4b25a62ddd01bba5fe06@cqplus1.com>
Date:   Fri, 1 Apr 2022 07:08:39 +0000
From:   qinjian[覃健] <qinjian@...lus1.com>
To:     Arnd Bergmann <arnd@...db.de>
CC:     Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>,
        Rob Herring <robh+dt@...nel.org>,
        Michael Turquette <mturquette@...libre.com>,
        "Stephen Boyd" <sboyd@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Marc Zyngier <maz@...nel.org>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        "Russell King - ARM Linux" <linux@...linux.org.uk>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        DTML <devicetree@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-clk <linux-clk@...r.kernel.org>
Subject: RE: [PATCH v12 9/9] ARM: sp7021_defconfig: Add Sunplus SP7021
 defconfig

> On Thu, Mar 31, 2022 at 10:29 AM Qin Jian <qinjian@...lus1.com> wrote:
> > Add generic Sunplus SP7021 based board defconfig
> 
> Here, you should explain why you need a custom defconfig for this SoC, as
> most platforms are fine just using the generic one. Are you too memory
> constrained,
> or are there other problems?
> 

For memory constrained board only.

> > diff --git a/arch/arm/configs/multi_v7_defconfig b/arch/arm/configs/multi_v7_defconfig
> > index 8863fa969..a3bd9dbd8 100644
> > --- a/arch/arm/configs/multi_v7_defconfig
> > +++ b/arch/arm/configs/multi_v7_defconfig
> > @@ -86,6 +86,7 @@ CONFIG_MACH_SPEAR1310=y
> >  CONFIG_MACH_SPEAR1340=y
> >  CONFIG_ARCH_STI=y
> >  CONFIG_ARCH_STM32=y
> > +CONFIG_ARCH_SUNPLUS=y
> >  CONFIG_ARCH_SUNXI=y
> >  CONFIG_ARCH_TEGRA=y
> >  CONFIG_ARCH_UNIPHIER=y
> 
> Don't you need any drivers here?
> 

Currently, all basic drivers auto enabled by mach-sunplus/Kconfig:
...
config SOC_SP7021
	bool "Sunplus SP7021 SoC support"
	depends on ARCH_SUNPLUS
	default ARCH_SUNPLUS
	select ARM_GIC
	select ARM_PSCI
	select PINCTRL
	select PINCTRL_SPPCTL
	select SERIAL_SUNPLUS
	select SERIAL_SUNPLUS_CONSOLE

and driver's Kconfig:
...
config RESET_SUNPLUS
        bool "Sunplus SoCs Reset Driver" if COMPILE_TEST
        default ARCH_SUNPLUS
...

> > diff --git a/arch/arm/configs/sp7021_defconfig b/arch/arm/configs/sp7021_defconfig
> > new file mode 100644
> > index 000000000..cda16d33a
> > --- /dev/null
> > +++ b/arch/arm/configs/sp7021_defconfig
> ...
> > +CONFIG_HAVE_ARM_ARCH_TIMER=y
> 
> I checked this one again, as most others don't enable it in the defconfig.
> 
> I don't remember if I recommended removing the 'select' from Kconfig
> in a previous round, but as that is where other platforms have it, I'd add
> it there as well.
> 

I'll move this to mach-sunplus/Kconfig.

> > +CONFIG_STAGING=y
> 
> Do you actually enable any staging drivers here? If not, I'd drop that bit.
> 

I’ll drop it.


Thanks all your comments.