linux-kernel - Re: [PATCH v4 13/13] ARM64 / ACPI: Enable ARM64 in Kconfig

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Message-ID: <53B2694F.7070501@linaro.org>
Date:	Tue, 01 Jul 2014 15:54:55 +0800
From:	Hanjun Guo <hanjun.guo@...aro.org>
To:	Catalin Marinas <catalin.marinas@....com>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>
CC:	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Arnd Bergmann <arnd@...db.de>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	"rric@...nel.org" <rric@...nel.org>,
	"grant.likely@...aro.org" <grant.likely@...aro.org>,
	Sudeep Holla <Sudeep.Holla@....com>,
	Mark Rutland <Mark.Rutland@....com>,
	Charles Garcia-Tobin <Charles.Garcia-Tobin@....com>,
	Lorenzo Pieralisi <Lorenzo.Pieralisi@....com>,
	"linaro-acpi@...ts.linaro.org" <linaro-acpi@...ts.linaro.org>,
	"graeme.gregory@...aro.org" <graeme.gregory@...aro.org>,
	Al Stone <al.stone@...aro.org>
Subject: Re: [PATCH v4 13/13] ARM64 / ACPI: Enable ARM64 in Kconfig

On 2014-6-30 18:46, Catalin Marinas wrote:
> On Fri, Jun 27, 2014 at 04:49:36AM +0100, Hanjun Guo wrote:
>> diff --git a/drivers/acpi/Kconfig b/drivers/acpi/Kconfig
>> index 7de5e3f..33d6dbb 100644
>> --- a/drivers/acpi/Kconfig
>> +++ b/drivers/acpi/Kconfig
>> @@ -8,10 +8,10 @@ config ACPI_SCAN_BIOS_NOT_EFI
>>  menuconfig ACPI
>>  	bool "ACPI (Advanced Configuration and Power Interface) Support"
>>  	depends on !IA64_HP_SIM
>> -	depends on IA64 || X86
>> +	depends on IA64 || X86 || ARM64
> 
> I still don't understand what the point of enabling ACPI for arm64
> during this series is. Do you get any working arm64 functionality
> (on hardware or model) without subsequent patches? If it's just for
> compilation reasons, the best we could do is depending on (ARM64 &&
> COMPILE_TEST) but even though I would not merge this patch until we have
> most of the arm64 required features in place (some of which are
> introduced by the upcoming ACPI version).

it is ok to me to merge all the patches together, but if Rafael is happy
with the clean up patches (patch 1~3) for ACPI core, they can be merged
first.

> 
>>  	depends on PCI
>>  	select PNP
>> -	default y
>> +	default y if !ARM64
> 
> For the benefit of single Image, I think you can default to y here.

It ok to me. if we default to y here, devicetree will not be unflattened
in default, is it ok to you? you can refer to "[PATCH 12/13] ARM64 / ACPI: if
we chose to boot from acpi then disable FDT".

Thanks
Hanjun
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