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

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Date:	Tue, 28 Oct 2014 13:15:27 +0200
From:	Mika Westerberg <mika.westerberg@...ux.intel.com>
To:	"Rafael J. Wysocki" <rjw@...ysocki.net>
Cc:	Darren Hart <dvhart@...ux.intel.com>,
	Alexandre Courbot <acourbot@...dia.com>,
	Linus Walleij <linus.walleij@...aro.org>,
	Arnd Bergmann <arnd@...db.de>,
	Mika Westerberg <mika.westerberg@...ux.intel.com>,
	linux-acpi@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] ACPI / GPIO: Pass index to acpi_get_gpiod_by_index() when using properties

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>
---
This is on top of latest linux-pm/device-properties.

 drivers/gpio/gpiolib.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
index fbf717a56b0a..58659dbe702a 100644
--- a/drivers/gpio/gpiolib.c
+++ b/drivers/gpio/gpiolib.c
@@ -1522,7 +1522,7 @@ static struct gpio_desc *acpi_find_gpio(struct device *dev, const char *con_id,
 				 suffixes[i]);
 		}
 
-		desc = acpi_get_gpiod_by_index(adev, propname, 0, &info);
+		desc = acpi_get_gpiod_by_index(adev, propname, idx, &info);
 		if (!IS_ERR(desc) || (PTR_ERR(desc) == -EPROBE_DEFER))
 			break;
 	}
-- 
2.1.1

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