linux-kernel - Re: [PATCH] arm64: enable RapidIO config options in Kconfig

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Date:   Tue, 24 Jul 2018 16:14:59 +0100
From:   Will Deacon <will.deacon@....com>
To:     Alexei Colin <acolin@....edu>
Cc:     linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Catalin Marinas <catalin.marinas@....com>,
        Alex Bounine <alex.bou9@...il.com>,
        Barry Wood <barry.wood@....com>,
        John Paul Walters <jwalters@....edu>
Subject: Re: [PATCH] arm64: enable RapidIO config options in Kconfig

On Tue, Jul 24, 2018 at 09:45:14AM -0400, Alexei Colin wrote:
> ARM64 SoCs with a PCI bus present the RapiodIO options; SoCs with
> RapidIO IP blocks but without a PCI bus, need to select HAS_RAPIDIO in
> Kconfig.platforms.
> 
> HAS_RAPIDIO was chosen over HAVE_RAPIDIO to be consistent with
> other architectures which already define this flag (powerpc).
> 
> Signed-off-by: Alexei Colin <acolin@....edu>
> ---
> 
> Tested that kernel builds with RapidIO subsystem and switch drivers and that
> modules insert successfully in a custom Qemu hardware model.
> Maintainers for RapidIO subsystem CCed.
> Similar patch for ARM has been submitted.
> 
>  arch/arm64/Kconfig | 16 ++++++++++++++++
>  1 file changed, 16 insertions(+)
> 
> diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
> index 42c090cf0292..8dceaa5b674c 100644
> --- a/arch/arm64/Kconfig
> +++ b/arch/arm64/Kconfig
> @@ -293,6 +293,22 @@ config PCI_SYSCALL
>  
>  source "drivers/pci/Kconfig"
>  
> +config HAS_RAPIDIO
> +	bool
> +	default n
> +
> +config RAPIDIO
> +	tristate "RapidIO support"
> +	depends on HAS_RAPIDIO || PCI
> +	help
> +	  This feature enables support for RapidIO high-performance
> +	  packet-switched interconnect.
> +
> +	  If you say Y here, the kernel will include drivers and
> +	  infrastructure code to support RapidIO interconnect devices.

It feels a bit weird to push this help text into the arch Kconfig files,
rather than just have them provide the HAS_RAPIDIO symbol, but if that's
what everybody else is doing then I guess it's fine.

Will