linux-kernel - Re: [PATCH v2 1/2] gpio / ACPI: Add knowledge about pin controllers to acpi_get

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Message-ID: <CACRpkdbXT367GgpG2=fNqPRG8-8Sz8syV0TNC68Hm6MFvdVBdQ@mail.gmail.com>
Date:	Tue, 4 Nov 2014 11:18:07 +0100
From:	Linus Walleij <linus.walleij@...aro.org>
To:	Mika Westerberg <mika.westerberg@...ux.intel.com>
Cc:	Alexandre Courbot <gnurou@...il.com>,
	Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
	Mathias Nyman <mathias.nyman@...ux.intel.com>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Ning Li <ning.li@...el.com>, Alan Cox <alan@...ux.intel.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 1/2] gpio / ACPI: Add knowledge about pin controllers
 to acpi_get_gpiod()

On Mon, Nov 3, 2014 at 12:01 PM, Mika Westerberg
<mika.westerberg@...ux.intel.com> wrote:

> The GPIO resources (GpioIo/GpioInt) used in ACPI contain a GPIO number
> which is relative to the hardware GPIO controller. Typically this number
> can be translated directly to Linux GPIO number because the mapping is
> pretty much 1:1.
>
> However, when the GPIO driver is using pins exported by a pin controller
> driver via set of GPIO ranges, the mapping might not be 1:1 anymore and
> direct translation does not work.
>
> In such cases we need to translate the ACPI GPIO number to be suitable for
> the GPIO controller driver in question by checking all the pin controller
> GPIO ranges under the given device and using those to get the proper GPIO
> number.
>
> Signed-off-by: Mika Westerberg <mika.westerberg@...ux.intel.com>
> Acked-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>

Sweet, patch applied.

Yours,
Linus Walleij
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