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From d410e5478c622c01fcf31427533df5f433df9146 Mon Sep 17 00:00:00 2001
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From: John Crispin <blogic@openwrt.org>
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Date: Sun, 28 Jul 2013 19:45:30 +0200
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Subject: [PATCH 26/53] DT: Add documentation for gpio-ralink
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Describe gpio-ralink binding.
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Signed-off-by: John Crispin <blogic@openwrt.org>
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Cc: linux-mips@linux-mips.org
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Cc: devicetree@vger.kernel.org
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Cc: linux-gpio@vger.kernel.org
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---
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.../devicetree/bindings/gpio/gpio-ralink.txt | 40 ++++++++++++++++++++
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1 file changed, 40 insertions(+)
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create mode 100644 Documentation/devicetree/bindings/gpio/gpio-ralink.txt
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--- /dev/null
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+++ b/Documentation/devicetree/bindings/gpio/gpio-ralink.txt
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@@ -0,0 +1,40 @@
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+Ralink SoC GPIO controller bindings
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+
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+Required properties:
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+- compatible:
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+ - "ralink,rt2880-gpio" for Ralink controllers
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+- #gpio-cells : Should be two.
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+ - first cell is the pin number
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+ - second cell is used to specify optional parameters (unused)
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+- gpio-controller : Marks the device node as a GPIO controller
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+- reg : Physical base address and length of the controller's registers
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+- interrupt-parent: phandle to the INTC device node
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+- interrupts : Specify the INTC interrupt number
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+- ralink,nr-gpio : Specify the number of GPIOs
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+- ralink,register-map : The register layout depends on the GPIO bank and actual
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+ SoC type. Register offsets need to be in this order.
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+ [ INT, EDGE, RENA, FENA, DATA, DIR, POL, SET, RESET, TOGGLE ]
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+
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+Optional properties:
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+- ralink,gpio-base : Specify the GPIO chips base number
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+
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+Example:
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+
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+ gpio0: gpio@600 {
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+ compatible = "ralink,rt5350-gpio", "ralink,rt2880-gpio";
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+
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+ #gpio-cells = <2>;
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+ gpio-controller;
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+
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+ reg = <0x600 0x34>;
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+
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+ interrupt-parent = <&intc>;
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+ interrupts = <6>;
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+
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+ ralink,gpio-base = <0>;
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+ ralink,nr-gpio = <24>;
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+ ralink,register-map = [ 00 04 08 0c
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+ 20 24 28 2c
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+ 30 34 ];
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+
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+ };
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