linux-kernel - Re: [PATCH 1/2] gpio / CrystalCove: support virtual GPIO

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Message-ID: <CACRpkdZZ-8MAXQ_T2CYyUb0pcdS707G+NCWTc0oHJ2eqr-dcUA@mail.gmail.com>
Date:	Tue, 23 Sep 2014 12:13:55 +0200
From:	Linus Walleij <linus.walleij@...aro.org>
To:	Aaron Lu <aaron.lu@...el.com>,
	Mika Westerberg <mika.westerberg@...ux.intel.com>,
	Darren Hart <dvhart@...ux.intel.com>
Cc:	Alexandre Courbot <gnurou@...il.com>,
	Samuel Ortiz <sameo@...ux.intel.com>,
	Lee Jones <lee.jones@...aro.org>,
	Arnd Bergmann <arnd@...db.de>,
	"linux-gpio@...r.kernel.org" <linux-gpio@...r.kernel.org>,
	"linux-arch@...r.kernel.org" <linux-arch@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Jacob Pan <jacob.jun.pan@...ux.intel.com>,
	Lejun Zhu <lejun.zhu@...el.com>,
	Radivoje Jovanovic <radivoje.jovanovic@...el.com>,
	Daniel Glöckner <dg@...ix.com>,
	ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>
Subject: Re: [PATCH 1/2] gpio / CrystalCove: support virtual GPIO

On Tue, Sep 9, 2014 at 4:32 AM, Aaron Lu <aaron.lu@...el.com> wrote:

> The virtual GPIO introduced in ACPI table of Baytrail-T based system is
> used to solve a problem under Windows. We do not have such problems
> under Linux so we do not actually need them. But we have to tell GPIO
> library that the Crystal Cove GPIO chip has this many GPIO pins or the
> common GPIO handler will refuse any access to those high number GPIO
> pins, which will resulted in a failure evaluation of every ACPI control
> method that is used to turn on/off power resource and/or report sensor
> temperatures.
>
> Due to the high number of virtual GPIOs, the value of ARCH_NR_GPIOS is
> bumped from 256 to 512 to avoid failures on platforms that have various
> GPIO controllers.
>
> Signed-off-by: Aaron Lu <aaron.lu@...el.com>

I have some other patch pending increasing the default GPIO# to
512, but anyhow: this needs review from someone. Where is
Lejun? Mika also reviewed last time. Someone I trust to understand
ACPI need to be involved, Rafael, Darren....

Yours,
Linus Walleij
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