From 57f0f512b273f60d52568b8c6b77e17f5636edc0 Mon Sep 17 00:00:00 2001
From: André Fabian Silva Delgado <emulatorman@parabola.nu>
Date: Wed, 5 Aug 2015 17:04:01 -0300
Subject: Initial import

---
 .../devicetree/bindings/gpio/8xxx_gpio.txt         | 74 ++++++++++++++++++++++
 1 file changed, 74 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/gpio/8xxx_gpio.txt

(limited to 'Documentation/devicetree/bindings/gpio/8xxx_gpio.txt')

diff --git a/Documentation/devicetree/bindings/gpio/8xxx_gpio.txt b/Documentation/devicetree/bindings/gpio/8xxx_gpio.txt
new file mode 100644
index 000000000..798cfc9d3
--- /dev/null
+++ b/Documentation/devicetree/bindings/gpio/8xxx_gpio.txt
@@ -0,0 +1,74 @@
+GPIO controllers on MPC8xxx SoCs
+
+This is for the non-QE/CPM/GUTs GPIO controllers as found on
+8349, 8572, 8610 and compatible.
+
+Every GPIO controller node must have #gpio-cells property defined,
+this information will be used to translate gpio-specifiers.
+See bindings/gpio/gpio.txt for details of how to specify GPIO
+information for devices.
+
+The GPIO module usually is connected to the SoC's internal interrupt
+controller, see bindings/interrupt-controller/interrupts.txt (the
+interrupt client nodes section) for details how to specify this GPIO
+module's interrupt.
+
+The GPIO module may serve as another interrupt controller (cascaded to
+the SoC's internal interrupt controller).  See the interrupt controller
+nodes section in bindings/interrupt-controller/interrupts.txt for
+details.
+
+Required properties:
+- compatible:		"fsl,<chip>-gpio" followed by "fsl,mpc8349-gpio"
+			for 83xx, "fsl,mpc8572-gpio" for 85xx, or
+			"fsl,mpc8610-gpio" for 86xx.
+- #gpio-cells:		Should be two. The first cell is the pin number
+			and the second cell is used to specify optional
+			parameters (currently unused).
+- interrupt-parent:	Phandle for the interrupt controller that
+			services interrupts for this device.
+- interrupts:		Interrupt mapping for GPIO IRQ.
+- gpio-controller:	Marks the port as GPIO controller.
+
+Optional properties:
+- interrupt-controller:	Empty boolean property which marks the GPIO
+			module as an IRQ controller.
+- #interrupt-cells:	Should be two.  Defines the number of integer
+			cells required to specify an interrupt within
+			this interrupt controller.  The first cell
+			defines the pin number, the second cell
+			defines additional flags (trigger type,
+			trigger polarity).  Note that the available
+			set of trigger conditions supported by the
+			GPIO module depends on the actual SoC.
+
+Example of gpio-controller nodes for a MPC8347 SoC:
+
+	gpio1: gpio-controller@c00 {
+		#gpio-cells = <2>;
+		compatible = "fsl,mpc8347-gpio", "fsl,mpc8349-gpio";
+		reg = <0xc00 0x100>;
+		interrupt-parent = <&ipic>;
+		interrupts = <74 0x8>;
+		gpio-controller;
+		interrupt-controller;
+		#interrupt-cells = <2>;
+	};
+
+	gpio2: gpio-controller@d00 {
+		#gpio-cells = <2>;
+		compatible = "fsl,mpc8347-gpio", "fsl,mpc8349-gpio";
+		reg = <0xd00 0x100>;
+		interrupt-parent = <&ipic>;
+		interrupts = <75 0x8>;
+		gpio-controller;
+	};
+
+Example of a peripheral using the GPIO module as an IRQ controller:
+
+	funkyfpga@0 {
+		compatible = "funky-fpga";
+		...
+		interrupt-parent = <&gpio1>;
+		interrupts = <4 3>;
+	};
-- 
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