From: Tien Hock Loh <thloh@xxxxxxxxxx>
Adds a new driver device tree binding for Altera soft GPIO IP
Signed-off-by: Tien Hock Loh <thloh@xxxxxxxxxx>
---
.../devicetree/bindings/gpio/gpio-altera.txt | 43 ++++++++++++++++++++
1 files changed, 43 insertions(+), 0 deletions(-)
create mode 100644 Documentation/devicetree/bindings/gpio/gpio-altera.txt
diff --git a/Documentation/devicetree/bindings/gpio/gpio-altera.txt b/Documentation/devicetree/bindings/gpio/gpio-altera.txt
new file mode 100644
index 0000000..649fa02
--- /dev/null
+++ b/Documentation/devicetree/bindings/gpio/gpio-altera.txt
@@ -0,0 +1,43 @@
+Altera GPIO controller bindings
+
+Required properties:
+- compatible:
+ - "altr,pio-1.0"
+- reg: Physical base address and length of the controller's registers.
+- #gpio-cells : Should be 2
+ - The first cell is the gpio offset number.
+ - The second cell is reserved and is currently unused.
+- gpio-controller : Marks the device node as a GPIO controller.
+- interrupt-controller: Mark the device node as an interrupt controller
+- #interrupt-cells : Should be 1. The interrupt type is fixed in the hardware.
+ - The first cell is the GPIO offset number within the GPIO controller.
+- interrupts: Specify the interrupt.
+- altr,interrupt-trigger: Specifies the interrupt trigger type the GPIO
+ hardware is synthesized. This field is required if the Altera GPIO controller
+ used has IRQ enabled as the interrupt type is not software controlled,
+ but hardware synthesized. Required if GPIO is used as an interrupt
+ controller. The value is defined in <dt-bindings/interrupt-controller/irq.h>
+ Only the following flags are supported:
+ IRQ_TYPE_EDGE_RISING
+ IRQ_TYPE_EDGE_FALLING
+ IRQ_TYPE_EDGE_BOTH
+ IRQ_TYPE_LEVEL_HIGH
+
+Optional properties:
+- altr,ngpio: Width of the GPIO bank. This defines how many pins the
+ GPIO device has. Ranges between 1-32. Optional and defaults to 32 is not
+ specified.
+
+Example:
+
+gpio_altr: gpio@0xff200000 {
+ compatible = "altr,pio-1.0";
+ reg = <0xff200000 0x10>;
+ interrupts = <0 45 4>;
+ altr,ngpio = <32>;
+ altr,interrupt_trigger = <IRQ_TYPE_EDGE_RISING>;
+ #gpio-cells = <1>;
+ gpio-controller;
+ #interrupt-cells = <1>;
+ interrupt-controller;
+};
--
1.7.1
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