linux-kernel - Re: [PATCH v1 1/3] ARM64 LPC: indirect ISA PORT IO introduced

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Date:	Wed, 30 Dec 2015 09:59:11 +0100
From:	Arnd Bergmann <arnd@...db.de>
To:	Rongrong Zou <zourongrong@...wei.com>
Cc:	Rongrong Zou <zourongrong@...il.com>, minyard@....org,
	gregkh@...uxfoundation.org, catalin.marinas@....com,
	will.deacon@....com, linuxarm@...wei.com,
	linux-kernel@...r.kernel.org, benh@...nel.crashing.org,
	lijianhua@...wei.com
Subject: Re: [PATCH v1 1/3] ARM64 LPC: indirect ISA PORT IO introduced

On Wednesday 30 December 2015 09:24:04 Rongrong Zou wrote:
> >>>> diff --git a/arch/arm64/Kconfig.platforms b/arch/arm64/Kconfig.platforms
> >>>> index 4043c35..98ae206 100644
> >>>> --- a/arch/arm64/Kconfig.platforms
> >>>> +++ b/arch/arm64/Kconfig.platforms
> >>>> @@ -127,5 +127,8 @@ config ARCH_ZYNQMP
> >>>>            bool "Xilinx ZynqMP Family"
> >>>>            help
> >>>>              This enables support for Xilinx ZynqMP Family
> >>>> -
> >>>> +config ARM64_INDIRECT_PIO
> >>>> +  bool "ARM64 Indirect port I/O"
> >>>> +  help
> >>>> +    This enables support for ARM64 indirect port I/O
> >>>>    endmenu
> >>>
> >>> The option should probably go into arch/arm64/Kconfig. Possibly you can make
> >>> it a silent option that just gets selected whenever a driver is enabled
> >>> that might set the callbacks.
> >>
> >> I try to bind it with HISILICON platform.
> >
> > It should be possible to build the actual driver on all platforms, at
> > least with COMPILE_TEST.
> 
> Sorry, I'm a little confused, can you describe it in detail?
> 
> 

config ARM64_INDIRECT_PIO
	bool
	help
	  Any driver that provides indirect ISA I/O port access should select
	  this symbol

config HISILICON_HI123456_LPC
	bool "Workaround for nonstandard ISA I/O space on Hisilicon Hi123456 SoC"
	depends on ARCH_HISI || COMPILE_TEST
	select ARM64_INDIRECT_PIO
	help
	  ...


	Arnd
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