linux-kernel - Re: [PATCH] ACPI / GPIO: Pass index to acpi_get_gpiod_by

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Message-ID: <544FBCFA.4070400@linux.intel.com>
Date:	Tue, 28 Oct 2014 08:57:46 -0700
From:	Darren Hart <dvhart@...ux.intel.com>
To:	Mika Westerberg <mika.westerberg@...ux.intel.com>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>
CC:	Alexandre Courbot <acourbot@...dia.com>,
	Linus Walleij <linus.walleij@...aro.org>,
	Arnd Bergmann <arnd@...db.de>, linux-acpi@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ACPI / GPIO: Pass index to acpi_get_gpiod_by_index()
 when using properties



On 10/28/14 4:15, Mika Westerberg wrote:
> acpi_dev_add_driver_gpios() makes it possible to set up mapping between
> properties and ACPI GpioIo resources in a driver, so we can take index
> parameter in acpi_find_gpio() into use with _DSD device properties now.
> 
> This index can be used to select a GPIO from a property with multiple
> GPIOs:
> 
>   Package () {
>   	"data-gpios",
>   	Package () {
>   		\_SB.GPIO, 0, 0, 0,
>   		\_SB.GPIO, 1, 0, 0,
>   		\_SB.GPIO, 2, 0, 1,
>   	}
>   }
> 
> In order to retrieve the last GPIO from a driver we can simply do:
> 
>   desc = devm_gpiod_get_index(dev, "data", 2);
> 
> and so on.
> 
> Signed-off-by: Mika Westerberg <mika.westerberg@...ux.intel.com>

Nice, that was a gap that had been gnawing at me. Thanks Mika :-)

Acked-by: Darren Hart <dvhart@...ux.intel.com>

-- 
Darren Hart
Intel Open Source Technology Center
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