This adds DT bindings for the IXP4xx GPIO controller.
Cc: Bartosz Golaszewski <bgolaszewski@xxxxxxxxxxxx>
Cc: devicetree@xxxxxxxxxxxxxxx
Signed-off-by: Linus Walleij <linus.walleij@xxxxxxxxxx>
---
Bartosz: looking for your ACK on this, it'd be good if
the other GPIO maintainer is aligned with my ideas here.
I intend to merge this through the ARM SoC tree.
---
.../bindings/gpio/intel,ixp4xx-gpio.txt | 38 +++++++++++++++++++
MAINTAINERS | 1 +
2 files changed, 39 insertions(+)
create mode 100644 Documentation/devicetree/bindings/gpio/intel,ixp4xx-gpio.txt
diff --git a/Documentation/devicetree/bindings/gpio/intel,ixp4xx-gpio.txt b/Documentation/devicetree/bindings/gpio/intel,ixp4xx-gpio.txt
new file mode 100644
index 000000000000..8dc41ed99685
--- /dev/null
+++ b/Documentation/devicetree/bindings/gpio/intel,ixp4xx-gpio.txt
@@ -0,0 +1,38 @@
+Intel IXP4xx XScale Networking Processors GPIO
+
+This GPIO controller is found in the Intel IXP4xx processors.
+It supports 16 GPIO lines.
+
+The interrupt portions of the GPIO controller is hierarchical:
+the synchronous edge detector is part of the GPIO block, but the
+actual enabling/disabling of the interrupt line is done in the
+main IXP4xx interrupt controller which has a 1:1 mapping for
+the first 12 GPIO lines to 12 system interrupts.
+
+The remaining 4 GPIO lines can not be used for receiving
+interrupts.
+
+The interrupt parent of this GPIO controller must be the
+IXP4xx interrupt controller.
+
+Required properties:
+
+- compatible : Should be
+ "intel,ixp4xx-gpio"
+- reg : Should contain registers location and length
+- gpio-controller : marks this as a GPIO controller
+- #gpio-cells : Should be 2, see gpio/gpio.txt
+- interrupt-controller : marks this as an interrupt controller
+- #interrupt-cells : a standard two-cell interrupt, see
+ interrupt-controller/interrupts.txt
+
+Example:
+
+gpio0: gpio@c8004000 {
+ compatible = "intel,ixp4xx-gpio";
+ reg = <0xc8004000 0x1000>;
+ gpio-controller;
+ #gpio-cells = <2>;
+ interrupt-controller;
+ #interrupt-cells = <2>;
+};
diff --git a/MAINTAINERS b/MAINTAINERS
index 775a623dc91d..57d098b85523 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -1650,6 +1650,7 @@ M: Imre Kaloz <kaloz@xxxxxxxxxxx>
M: Krzysztof Halasa <khalasa@xxxxxxx>
L: linux-arm-kernel@xxxxxxxxxxxxxxxxxxx (moderated for non-subscribers)
S: Maintained
+F: Documentation/devicetree/bindings/gpio/intel,ixp4xx-gpio.txt
F: Documentation/devicetree/bindings/interrupt-controller/intel,ixp4xx-interrupt.txt
F: Documentation/devicetree/bindings/timer/intel,ixp4xx-timer.txt
F: arch/arm/mach-ixp4xx/
--
2.20.1
