linux-kernel - Re: [RFC PATCH v3 01/17] ARM: add CONFIG_ARCH_SUNXI_V7 for differentiate ARMv5/v7 Allwinner SoCs

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Message-ID: <20181122082635.br5n33owxxpenv62@flea>
Date:   Thu, 22 Nov 2018 09:26:35 +0100
From:   Maxime Ripard <maxime.ripard@...tlin.com>
To:     Mesih Kilinc <mesihkilinc@...il.com>
Cc:     devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, linux-clk@...r.kernel.org,
        linux-gpio@...r.kernel.org, linux-sunxi@...glegroups.com,
        Chen-Yu Tsai <wens@...e.org>,
        Russell King <linux@...linux.org.uk>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        Marc Zyngier <marc.zyngier@....com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Icenowy Zheng <icenowy@...c.io>,
        Rob Herring <robh+dt@...nel.org>,
        Julian Calaby <julian.calaby@...il.com>
Subject: Re: [RFC PATCH v3 01/17] ARM: add CONFIG_ARCH_SUNXI_V7 for
 differentiate ARMv5/v7 Allwinner SoCs

On Wed, Nov 21, 2018 at 09:30:34PM +0300, Mesih Kilinc wrote:
> Allwinner also has some ARMv5 SoCs.
> 
> In order to add support for them, add a CONFIG_ARCH_SUNXI_V7 bool config
> which is selected when a ARMv7 soc is selected, and make CONFIG_ARCH_SUNXI
> a common option which is selected by both V7 and V5 sunxi option.
> 
> Signed-off-by: Mesih Kilinc <mesihkilinc@...il.com>
> ---
>  arch/arm/mach-sunxi/Kconfig | 23 ++++++++++++++++-------
>  1 file changed, 16 insertions(+), 7 deletions(-)
> 
> diff --git a/arch/arm/mach-sunxi/Kconfig b/arch/arm/mach-sunxi/Kconfig
> index d9c8ecf..7e5f173 100644
> --- a/arch/arm/mach-sunxi/Kconfig
> +++ b/arch/arm/mach-sunxi/Kconfig
> @@ -6,31 +6,38 @@ menuconfig ARCH_SUNXI
>  	select GENERIC_IRQ_CHIP
>  	select GPIOLIB
>  	select PINCTRL
> -	select PM_OPP
>  	select SUN4I_TIMER
>  	select RESET_CONTROLLER
> +	help
> +	  Support for Allwinner ARM-based family of processors
>  
>  if ARCH_SUNXI
>  
> +if ARCH_MULTI_V7
> +
> +config ARCH_SUNXI_V7
> +	bool
> +	select PM_OPP
> +

Actually, thinking more about this, I don't see why the PM_OPP config
option should be made specific to the ARMv7 sunxi SoCs, you will have
things cpufreq enabled at some point as well on the armv5 support.

>  config MACH_SUN4I
>  	bool "Allwinner A10 (sun4i) SoCs support"
> -	default ARCH_SUNXI
> +	select ARCH_SUNXI_V7

The option is still changed from being on by default to being off by
default. This breaks all the defconfig, and we really shouldn't change
that.

Maxime

-- 
Maxime Ripard, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com

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