linux-kernel - Re: [PATCH 1/2] arm/arm64: ACPI: Introduce CONFIG_ACPI_MUST_HAVE

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Message-ID: <20150430150155.GA27499@red-moon>
Date:	Thu, 30 Apr 2015 16:01:55 +0100
From:	Lorenzo Pieralisi <lorenzo.pieralisi@....com>
To:	Will Deacon <will.deacon@....com>
Cc:	"hanjun.guo@...aro.org" <hanjun.guo@...aro.org>,
	Catalin Marinas <Catalin.Marinas@....com>,
	"suravee.suthikulpanit@....com" <suravee.suthikulpanit@....com>,
	"al.stone@...aro.org" <al.stone@...aro.org>,
	"arnd@...db.de" <arnd@...db.de>,
	"linaro-acpi@...ts.linaro.org" <linaro-acpi@...ts.linaro.org>,
	"rjw@...ysocki.net" <rjw@...ysocki.net>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>,
	"leo.duran@....com" <leo.duran@....com>,
	"msalter@...hat.com" <msalter@...hat.com>,
	"grant.likely@...aro.org" <grant.likely@...aro.org>,
	Charles Garcia-Tobin <Charles.Garcia-Tobin@....com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"lenb@...nel.org" <lenb@...nel.org>
Subject: Re: [PATCH 1/2] arm/arm64: ACPI: Introduce CONFIG_ACPI_MUST_HAVE_CCA

On Thu, Apr 30, 2015 at 02:50:18PM +0100, Will Deacon wrote:
> On Thu, Apr 30, 2015 at 02:47:13PM +0100, Hanjun Guo wrote:
> > On 2015???04???29??? 22:42, Catalin Marinas wrote:
> > > On Wed, Apr 29, 2015 at 09:31:03AM -0500, Suravee Suthikulpanit wrote:
> > >> On 04/29/2015 09:04 AM, Catalin Marinas wrote:
> > >>> On Wed, Apr 29, 2015 at 08:44:08AM -0500, Suravee Suthikulpanit wrote:
> > >>> Any plans for ACPI on 32-bit ARM?
> > >>
> > >> Not that I am aware, but I could be totally wrong. The reason I am adding
> > >> this here for 32-bit ARM is because the ACPI spec mentioned this.
> > >>
> > >> If you think this is not necessary until we introduce ACPI for ARM32, it can
> > >> be removed.
> > >
> > > I think it should be removed (as long as ACPI cannot be selected on
> > > arm32).
> > 
> > I agree.
> > 
> > Now there is no plan for ARM32 ACPI as I know, ACPI for ARM targets
> > for ARM64 based enterprise system at now.
> 
> While we're at it, do we *really* need to support CONFIG_ACPI_PROCFS_POWER
> on arm64? It's a deprecated /proc/acpi interface and it would be nice to
> avoid introducing deprecated behaviour if we can avoid it.

I think we can make it depend on x86 because the compilation units that
create that proc dirs (ACPI_BATTERY and ACPI_AC) already depend on it,
at the moment compiling drivers/acpi/cm_sbs.c is totally useless on
arm64.

Lorenzo
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