linux-kernel - Re: [PATCH v8 02/11] power: reset: Add reboot driver for brcmstb

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Date:	Tue, 22 Jul 2014 09:28:39 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	Brian Norris <computersforpeace@...il.com>
Cc:	Olof Johansson <olof@...om.net>, Matt Porter <mporter@...aro.org>,
	Christian Daudt <bcm@...thebug.org>,
	Russell King <linux@....linux.org.uk>,
	linux-arm-kernel@...ts.infradead.org,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	devicetree@...r.kernel.org, Gregory Fong <gregory.0xf0@...il.com>,
	Florian Fainelli <f.fainelli@...il.com>,
	Marc Carino <marc.ceeeee@...il.com>,
	Dmitry Eremin-Solenikov <dbaryshkov@...il.com>,
	David Woodhouse <dwmw2@...radead.org>
Subject: Re: [PATCH v8 02/11] power: reset: Add reboot driver for brcmstb

On Monday 21 July 2014 14:07:57 Brian Norris wrote:
> diff --git a/arch/arm/mach-bcm/Kconfig b/arch/arm/mach-bcm/Kconfig
> index 0073633e7699..9782e8d80647 100644
> --- a/arch/arm/mach-bcm/Kconfig
> +++ b/arch/arm/mach-bcm/Kconfig
> @@ -94,6 +94,7 @@ config ARCH_BRCMSTB
>         select MIGHT_HAVE_PCI
>         select HAVE_SMP
>         select HAVE_ARM_ARCH_TIMER
> +       select POWER_RESET_BRCMSTB
>         help
>           Say Y if you intend to run the kernel on a Broadcom ARM-based STB
>           chipset.
> diff --git a/drivers/power/reset/Kconfig b/drivers/power/reset/Kconfig
> index bdcf5173e377..fcb9825debe5 100644
> --- a/drivers/power/reset/Kconfig
> +++ b/drivers/power/reset/Kconfig
> @@ -20,6 +20,16 @@ config POWER_RESET_AXXIA
>  
>           Say Y if you have an Axxia family SoC.
>  
> +config POWER_RESET_BRCMSTB
> +       bool "Broadcom STB reset driver"
> +       depends on POWER_RESET && ARCH_BRCMSTB
> +       help
> +         This driver provides restart support for ARM-based Broadcom STB
> +         boards.
> +
> +         Say Y here if you have an ARM-based Broadcom STB board and you wish
> +         to have restart support.
> +
>  config POWER_RESET_GPIO
>         bool "GPIO power-off driver"
>         depends on OF_GPIO && POWER_RESET
> 

(nitpicking)

You shouldn't have both a user-selectable option and 'select' it from
the platform, because it makes it inherently not selectable, in particular
in the combination with 'depends on ARCH_BRCMSTB'.

One way to solve this would be to change the dependency to

config POWER_RESET_BRCMSTB
	bool "Broadcom STB reset driver"
	depends on POWER_RESET && ARM
	depends on ARCH_BRCMSTB || COMPILE_TEST

which in effect would allow building it on any ARM machine as long as
COMPILE_TEST is set (which normally is not).

The same could be expressed using

config POWER_RESET_BRCMSTB
	bool "Broadcom STB reset driver" if COMPILE_TEST
	depends on POWER_RESET && ARM

My preference in this case however would be to just drop the 'select'
statement and add the driver to the defconfig file.

	Arnd
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