linux-kernel - Re: [PATCH 1/3] gpio / ACPI: add ACPI support

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Message-ID: <6279158.LZAthHxtvS@vostro.rjw.lan>
Date:	Mon, 05 Nov 2012 13:46:55 +0100
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Mathias Nyman <mathias.nyman@...ux.intel.com>
Cc:	Linus Walleij <linus.walleij@...aro.org>,
	Mika Westerberg <mika.westerberg@...ux.intel.com>,
	linux-kernel@...r.kernel.org, lenb@...nel.org,
	rafael.j.wysocki@...el.com, broonie@...nsource.wolfsonmicro.com,
	grant.likely@...retlab.ca, khali@...ux-fr.org, ben-linux@...ff.org,
	w.sang@...gutronix.de, linux-acpi@...r.kernel.org
Subject: Re: [PATCH 1/3] gpio / ACPI: add ACPI support

On Monday, November 05, 2012 02:14:21 PM Mathias Nyman wrote:
> On 11/05/2012 01:53 PM, Linus Walleij wrote:
> > On Sat, Nov 3, 2012 at 8:46 AM, Mika Westerberg
> > <mika.westerberg@...ux.intel.com>  wrote:
> >
> >> +/**
> >> + * acpi_get_gpio() - Translate ACPI GPIO pin to GPIO number usable with GPIO API
> >> + * @path:      ACPI GPIO controller full path name, (e.g. "\\_SB.GPO1")
> >> + * @pin:       ACPI GPIO pin number (0-based, controller-relative)
> >> + *
> >> + * Returns GPIO number to use with Linux generic GPIO API, or errno error value
> >> + */
> >
> > So by just looking at that we can see that this is yet another
> > instance of papering
> > over the fact that the Linux GPIO numbers are global to the kernel and not
> > per-chip, as would be preferred.
> 
> Yes, it is. ACPI5 GPIO resources are numbered per-chip. This is just a 
> way for device drivers to find the corresponding Linux GPIO.
> 
> per-chip based numbering sounds saner, but this deals with what we 
> currently have.

And we need something to hook up drivers to right now.

Thanks,
Rafael


-- 
I speak only for myself.
Rafael J. Wysocki, Intel Open Source Technology Center.
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