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dts: gpio_atmel: adapt binding doc to reality

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The second cell in a gpio reference is used to pass GPIO_ACTIVE_LOW or
GPIO_ACTIVE_HIGH. The gpio device can also be used as irq controller and
a reference can contain the IRQ_TYPE_* values in the second cell.

Signed-off-by: Uwe Kleine-König <uwe@kleine-koenig.org>
Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
This commit is contained in:
Uwe Kleine-König 2017-05-26 21:07:03 +02:00 committed by Alexandre Belloni
parent bc6d5d7666
commit 20d4dcec04
1 changed files with 8 additions and 2 deletions
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10
Documentation/devicetree/bindings/gpio/gpio_atmel.txt
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@ -5,9 +5,13 @@ Required properties:
- reg: Should contain GPIO controller registers location and length
- interrupts: Should be the port interrupt shared by all the pins.
- #gpio-cells: Should be two. The first cell is the pin number and
the second cell is used to specify optional parameters (currently
unused).
the second cell is used to specify optional parameters to declare if the GPIO
is active high or low. See gpio.txt.
- gpio-controller: Marks the device node as a GPIO controller.
- interrupt-controller: Marks the device node as an interrupt controller.
- #interrupt-cells: Should be two. The first cell is the pin number and the
second cell is used to specify irq type flags, see the two cell description
in interrupt-controller/interrupts.txt for details.
optional properties:
- #gpio-lines: Number of gpio if absent 32.
@ -21,5 +25,7 @@ Example:
#gpio-cells = <2>;
gpio-controller;
#gpio-lines = <19>;
interrupt-controller;
#interrupt-cells = <2>;
};