linux-kernel - Re: [PATCH v2 1/2] gpio / CrystalCove: support virtual GPIO

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Message-ID: <20140925111555.GG1786@lahna.fi.intel.com>
Date:	Thu, 25 Sep 2014 14:15:55 +0300
From:	Mika Westerberg <mika.westerberg@...ux.intel.com>
To:	Aaron Lu <aaron.lu@...el.com>
Cc:	Linus Walleij <linus.walleij@...aro.org>,
	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 v2 1/2] gpio / CrystalCove: support virtual GPIO

On Thu, Sep 25, 2014 at 10:57:26AM +0800, Aaron Lu 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.
> 
> Signed-off-by: Aaron Lu <aaron.lu@...el.com>

Reviewed-by: Mika Westerberg <mika.westerberg@...ux.intel.com>

A minor nit, see below:

> ---
> v2: remove the hunk to increase NR_GPIO to 512.
> 
>  drivers/gpio/gpio-crystalcove.c | 19 ++++++++++++++++---
>  1 file changed, 16 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/gpio/gpio-crystalcove.c b/drivers/gpio/gpio-crystalcove.c
> index e3712f0e51ab..186b76ef71a1 100644
> --- a/drivers/gpio/gpio-crystalcove.c
> +++ b/drivers/gpio/gpio-crystalcove.c
> @@ -24,6 +24,7 @@
>  #include <linux/mfd/intel_soc_pmic.h>
>  
>  #define CRYSTALCOVE_GPIO_NUM	16
> +#define CRYSTALCOVE_VGPIO_NUM	0x5e

I would rather see this spelled in decimal base.
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