From: Dirk Behme <dirk.behme@gmail.com>
To: Alexandre Courbot <gnurou@gmail.com>,
Linus Walleij <linus.walleij@linaro.org>
Cc: linux-gpio@vger.kernel.org, Dirk Behme <dirk.behme@gmail.com>
Subject: [PATCH 1/2 v3] Documentation: gpio: board: add flags parameter to gpiod_get*() functions
Date: Wed, 2 Sep 2015 20:07:09 +0200 [thread overview]
Message-ID: <1441217230-4530-1-git-send-email-dirk.behme@gmail.com> (raw)
With commit 39b2bbe3d715 ("gpio: add flags argument to gpiod_get*()
functions") the gpiod_get*() functions got a 'flags' parameter. Reflect
this in the documentation, too.
Signed-off-by: Dirk Behme <dirk.behme@gmail.com>
---
Changes in v3: Add a short note to mention the fact that the example will
switch the LEDs on, similarly to the existing explanation
for the "power" GPIO.
Documentation/gpio/board.txt | 25 +++++++++++++------------
1 file changed, 13 insertions(+), 12 deletions(-)
diff --git a/Documentation/gpio/board.txt b/Documentation/gpio/board.txt
index b80606d..9edd5af 100644
--- a/Documentation/gpio/board.txt
+++ b/Documentation/gpio/board.txt
@@ -39,11 +39,11 @@ This property will make GPIOs 15, 16 and 17 available to the driver under the
struct gpio_desc *red, *green, *blue, *power;
- red = gpiod_get_index(dev, "led", 0);
- green = gpiod_get_index(dev, "led", 1);
- blue = gpiod_get_index(dev, "led", 2);
+ red = gpiod_get_index(dev, "led", 0, GPIOD_OUT_HIGH);
+ green = gpiod_get_index(dev, "led", 1, GPIOD_OUT_HIGH);
+ blue = gpiod_get_index(dev, "led", 2, GPIOD_OUT_HIGH);
- power = gpiod_get(dev, "power");
+ power = gpiod_get(dev, "power", GPIOD_OUT_HIGH);
The led GPIOs will be active-high, while the power GPIO will be active-low (i.e.
gpiod_is_active_low(power) will be true).
@@ -142,13 +142,14 @@ The driver controlling "foo.0" will then be able to obtain its GPIOs as follows:
struct gpio_desc *red, *green, *blue, *power;
- red = gpiod_get_index(dev, "led", 0);
- green = gpiod_get_index(dev, "led", 1);
- blue = gpiod_get_index(dev, "led", 2);
+ red = gpiod_get_index(dev, "led", 0, GPIOD_OUT_HIGH);
+ green = gpiod_get_index(dev, "led", 1, GPIOD_OUT_HIGH);
+ blue = gpiod_get_index(dev, "led", 2, GPIOD_OUT_HIGH);
- power = gpiod_get(dev, "power");
- gpiod_direction_output(power, 1);
+ power = gpiod_get(dev, "power", GPIOD_OUT_HIGH);
-Since the "power" GPIO is mapped as active-low, its actual signal will be 0
-after this code. Contrary to the legacy integer GPIO interface, the active-low
-property is handled during mapping and is thus transparent to GPIO consumers.
+Since the "led" GPIOs are mapped as active-high, this example will switch their
+signals to 1, i.e. enabling the LEDs. And for the "power" GPIO, which is mapped
+as active-low, its actual signal will be 0 after this code. Contrary to the legacy
+integer GPIO interface, the active-low property is handled during mapping and is
+thus transparent to GPIO consumers.
--
2.5.1
next reply other threads:[~2015-09-02 18:07 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-09-02 18:07 Dirk Behme [this message]
2015-09-02 18:07 ` [PATCH 2/2 v3] Documentation: gpio: board: describe the con_id parameter Dirk Behme
2015-09-08 13:46 ` Linus Walleij
2015-09-08 13:45 ` [PATCH 1/2 v3] Documentation: gpio: board: add flags parameter to gpiod_get*() functions Linus Walleij
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